| r0.1 | label_boi_a2/Unlinked | | | | N/A | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r0.2 | label_boi_a2/Linked to the CPI | | | | N/A | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r0.3 | label_boi_a2/In U.S. dollars | | | | N/A | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r0.4 | label_boi_a2/In Euro | | | | N/A | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r0.5 | label_boi_a2/In other currencies | | | | N/A | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r0.6 | label_boi_a2/Non Monetary items | | | | N/A | boi_CS:x2 | N/A | N/A | boi_FN:x2 | N/A | N/A | boi_RP:x24 | N/A |
| r0.7 | label_boi_a2/Total | | | | N/A | boi_CS:x2 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 | N/A |
| r1.1 | Assets/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r1.2 | Assets/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r1.3 | Assets/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r1.4 | Assets/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r1.5 | Assets/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r1.6 | Assets/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | N/A | N/A | boi_RP:x24 | N/A |
| r1.7 | Assets/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 1.1 | Cash and deposits with banks/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x9 | N/A | boi_RP:x24 | boi_SE:x1 |
| 1.2 | Cash and deposits with banks/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x9 | N/A | boi_RP:x24 | boi_SE:x1 |
| 1.3 | Cash and deposits with banks/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x9 | N/A | boi_RP:x24 | boi_SE:x1 |
| 1.4 | Cash and deposits with banks/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x9 | N/A | boi_RP:x24 | boi_SE:x1 |
| 1.5 | Cash and deposits with banks/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x9 | N/A | boi_RP:x24 | boi_SE:x1 |
| 1.6 | Cash and deposits with banks/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x9 | N/A | boi_RP:x24 | boi_SE:x1 |
| 1.7 | Cash and deposits with banks/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x9 | N/A | boi_RP:x24 | boi_SE:x1 |
| 2.1 | Securities/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x29 | N/A | boi_RP:x24 | N/A |
| 2.2 | Securities/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x29 | N/A | boi_RP:x24 | N/A |
| 2.3 | Securities/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x29 | N/A | boi_RP:x24 | N/A |
| 2.4 | Securities/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x29 | N/A | boi_RP:x24 | N/A |
| 2.5 | Securities/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x29 | N/A | boi_RP:x24 | N/A |
| 2.6 | Securities/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x29 | N/A | boi_RP:x24 | N/A |
| 2.7 | Securities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x29 | N/A | boi_RP:x24 | N/A |
| 3.1 | Securities borrowed or purchased under agreements to resell/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 3.2 | Securities borrowed or purchased under agreements to resell/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 3.3 | Securities borrowed or purchased under agreements to resell/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 3.4 | Securities borrowed or purchased under agreements to resell/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 3.5 | Securities borrowed or purchased under agreements to resell/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 3.6 | Securities borrowed or purchased under agreements to resell/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 3.7 | Securities borrowed or purchased under agreements to resell/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 4.1 | Credit to the public, net/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x16 |
| 4.2 | Credit to the public, net/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x16 |
| 4.3 | Credit to the public, net/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x16 |
| 4.4 | Credit to the public, net/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x16 |
| 4.5 | Credit to the public, net/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x16 |
| 4.6 | Credit to the public, net/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x16 |
| 4.7 | Credit to the public, net/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x16 |
| 5.1 | Credit to the governments/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x11 |
| 5.2 | Credit to the governments/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x11 |
| 5.3 | Credit to the governments/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x11 |
| 5.4 | Credit to the governments/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x11 |
| 5.5 | Credit to the governments/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x11 |
| 5.6 | Credit to the governments/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x11 |
| 5.7 | Credit to the governments/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x8 | N/A | boi_RP:x24 | boi_SE:x11 |
| 6.1 | Investments in companies included on equity basis/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x54 | N/A | boi_RP:x24 | N/A |
| 6.2 | Investments in companies included on equity basis/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x54 | N/A | boi_RP:x24 | N/A |
| 6.3 | Investments in companies included on equity basis/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x54 | N/A | boi_RP:x24 | N/A |
| 6.4 | Investments in companies included on equity basis/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x54 | N/A | boi_RP:x24 | N/A |
| 6.5 | Investments in companies included on equity basis/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x54 | N/A | boi_RP:x24 | N/A |
| 6.6 | Investments in companies included on equity basis/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x54 | N/A | boi_RP:x24 | N/A |
| 6.7 | Investments in companies included on equity basis/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x54 | N/A | boi_RP:x24 | N/A |
| 7.1 | Buildings an equipment/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x6 | N/A | boi_RP:x24 | N/A |
| 7.2 | Buildings an equipment/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x6 | N/A | boi_RP:x24 | N/A |
| 7.3 | Buildings an equipment/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x6 | N/A | boi_RP:x24 | N/A |
| 7.4 | Buildings an equipment/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x6 | N/A | boi_RP:x24 | N/A |
| 7.5 | Buildings an equipment/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x6 | N/A | boi_RP:x24 | N/A |
| 7.6 | Buildings an equipment/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x6 | N/A | boi_RP:x24 | N/A |
| 7.7 | Buildings an equipment/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x6 | N/A | boi_RP:x24 | N/A |
| 8.1 | Assets in respect of derivative instruments/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 8.2 | Assets in respect of derivative instruments/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 8.3 | Assets in respect of derivative instruments/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 8.4 | Assets in respect of derivative instruments/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 8.5 | Assets in respect of derivative instruments/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 8.6 | Assets in respect of derivative instruments/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 8.7 | Assets in respect of derivative instruments/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 9.1 | Other assets and intangible property/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x833 | N/A | boi_RP:x24 | N/A |
| 9.2 | Other assets and intangible property/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x833 | N/A | boi_RP:x24 | N/A |
| 9.3 | Other assets and intangible property/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x833 | N/A | boi_RP:x24 | N/A |
| 9.4 | Other assets and intangible property/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x833 | N/A | boi_RP:x24 | N/A |
| 9.5 | Other assets and intangible property/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x833 | N/A | boi_RP:x24 | N/A |
| 9.6 | Other assets and intangible property/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x833 | N/A | boi_RP:x24 | N/A |
| 9.7 | Other assets and intangible property/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x833 | N/A | boi_RP:x24 | N/A |
| 10.1 | Total assets will be reported only on those who didn't report the entire table/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 10.2 | Total assets will be reported only on those who didn't report the entire table/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 10.3 | Total assets will be reported only on those who didn't report the entire table/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 10.4 | Total assets will be reported only on those who didn't report the entire table/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 10.5 | Total assets will be reported only on those who didn't report the entire table/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 10.6 | Total assets will be reported only on those who didn't report the entire table/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 10.7 | Total assets will be reported only on those who didn't report the entire table/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 11.1 | Total assets/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 11.2 | Total assets/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 11.3 | Total assets/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 11.4 | Total assets/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 11.5 | Total assets/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 11.6 | Total assets/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| 11.7 | Total assets/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x1 | N/A | boi_RP:x24 | N/A |
| r13.1 | Liabilities/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r13.2 | Liabilities/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r13.3 | Liabilities/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r13.4 | Liabilities/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r13.5 | Liabilities/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| r13.6 | Liabilities/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | N/A | N/A | boi_RP:x24 | N/A |
| r13.7 | Liabilities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 12.1 | Deposits of the public/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x16 |
| 12.2 | Deposits of the public/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x16 |
| 12.3 | Deposits of the public/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x16 |
| 12.4 | Deposits of the public/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x16 |
| 12.5 | Deposits of the public/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x16 |
| 12.6 | Deposits of the public/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x16 |
| 12.7 | Deposits of the public/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x16 |
| 13.1 | Deposits from banks/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x1 |
| 13.2 | Deposits from banks/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x1 |
| 13.3 | Deposits from banks/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x1 |
| 13.4 | Deposits from banks/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x1 |
| 13.5 | Deposits from banks/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x1 |
| 13.6 | Deposits from banks/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x1 |
| 13.7 | Deposits from banks/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x1 |
| 14.1 | Deposits from governments/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x11 |
| 14.2 | Deposits from governments/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x11 |
| 14.3 | Deposits from governments/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x11 |
| 14.4 | Deposits from governments/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x11 |
| 14.5 | Deposits from governments/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x11 |
| 14.6 | Deposits from governments/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x11 |
| 14.7 | Deposits from governments/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x17 | N/A | boi_RP:x24 | boi_SE:x11 |
| 15.1 | Securities loaned or sold under agreements to repurchase/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 15.2 | Securities loaned or sold under agreements to repurchase/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 15.3 | Securities loaned or sold under agreements to repurchase/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 15.4 | Securities loaned or sold under agreements to repurchase/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 15.5 | Securities loaned or sold under agreements to repurchase/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 15.6 | Securities loaned or sold under agreements to repurchase/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 15.7 | Securities loaned or sold under agreements to repurchase/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x28 | N/A | boi_RP:x24 | N/A |
| 16.1 | Debentures, bonds and subordinated notes/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x15 | N/A | boi_RP:x24 | N/A |
| 16.2 | Debentures, bonds and subordinated notes/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x15 | N/A | boi_RP:x24 | N/A |
| 16.3 | Debentures, bonds and subordinated notes/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x15 | N/A | boi_RP:x24 | N/A |
| 16.4 | Debentures, bonds and subordinated notes/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x15 | N/A | boi_RP:x24 | N/A |
| 16.5 | Debentures, bonds and subordinated notes/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x15 | N/A | boi_RP:x24 | N/A |
| 16.6 | Debentures, bonds and subordinated notes/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x15 | N/A | boi_RP:x24 | N/A |
| 16.7 | Debentures, bonds and subordinated notes/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x15 | N/A | boi_RP:x24 | N/A |
| 17.1 | Liabilities in respect of derivative instruments/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 17.2 | Liabilities in respect of derivative instruments/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 17.3 | Liabilities in respect of derivative instruments/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 17.4 | Liabilities in respect of derivative instruments/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 17.5 | Liabilities in respect of derivative instruments/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 17.6 | Liabilities in respect of derivative instruments/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 17.7 | Liabilities in respect of derivative instruments/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x18 | N/A | boi_RP:x24 | N/A |
| 18.1 | Other liabilities/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x20 | N/A | boi_RP:x24 | N/A |
| 18.2 | Other liabilities/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x20 | N/A | boi_RP:x24 | N/A |
| 18.3 | Other liabilities/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x20 | N/A | boi_RP:x24 | N/A |
| 18.4 | Other liabilities/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x20 | N/A | boi_RP:x24 | N/A |
| 18.5 | Other liabilities/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x20 | N/A | boi_RP:x24 | N/A |
| 18.6 | Other liabilities/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x20 | N/A | boi_RP:x24 | N/A |
| 18.7 | Other liabilities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x20 | N/A | boi_RP:x24 | N/A |
| 19.1 | Total liabilities will be reported only on those who didn't report the entire table/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 19.2 | Total liabilities will be reported only on those who didn't report the entire table/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 19.3 | Total liabilities will be reported only on those who didn't report the entire table/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 19.4 | Total liabilities will be reported only on those who didn't report the entire table/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 19.5 | Total liabilities will be reported only on those who didn't report the entire table/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 19.6 | Total liabilities will be reported only on those who didn't report the entire table/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 19.7 | Total liabilities will be reported only on those who didn't report the entire table/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 20.1 | Total liabilities/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 20.2 | Total liabilities/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 20.3 | Total liabilities/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 20.4 | Total liabilities/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 20.5 | Total liabilities/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 20.6 | Total liabilities/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 20.7 | Total liabilities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x3 | N/A | boi_RP:x24 | N/A |
| 21.1 | Difference/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 21.2 | Difference/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 21.3 | Difference/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 21.4 | Difference/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 21.5 | Difference/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 21.6 | Difference/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | N/A | N/A | boi_RP:x24 | N/A |
| 21.7 | Difference/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 | N/A |
| r24.1 | Effect of hedging derivative instruments/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x5 | boi_EF:x2 | boi_FN:x1 | N/A | boi_PL:x11 | boi_RP:x24 | N/A |
| r24.2 | Effect of hedging derivative instruments/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x6 | boi_EF:x2 | boi_FN:x1 | N/A | boi_PL:x11 | boi_RP:x24 | N/A |
| r24.3 | Effect of hedging derivative instruments/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x16 | boi_EF:x2 | boi_FN:x1 | N/A | boi_PL:x11 | boi_RP:x24 | N/A |
| r24.4 | Effect of hedging derivative instruments/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x17 | boi_EF:x2 | boi_FN:x1 | N/A | boi_PL:x11 | boi_RP:x24 | N/A |
| r24.5 | Effect of hedging derivative instruments/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x9 | boi_EF:x2 | boi_FN:x1 | N/A | boi_PL:x11 | boi_RP:x24 | N/A |
| r24.6 | Effect of hedging derivative instruments/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | boi_FN:x2 | N/A | boi_PL:x11 | boi_RP:x24 | N/A |
| r24.7 | Effect of hedging derivative instruments/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | N/A | N/A | boi_PL:x11 | boi_RP:x24 | N/A |
| 22.1 | Derivative instruments (except options)/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x5 | boi_EF:x2 | boi_FN:x1 | boi_MC:x51 | boi_PL:x11 | boi_RP:x24 | N/A |
| 22.2 | Derivative instruments (except options)/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x6 | boi_EF:x2 | boi_FN:x1 | boi_MC:x51 | boi_PL:x11 | boi_RP:x24 | N/A |
| 22.3 | Derivative instruments (except options)/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x16 | boi_EF:x2 | boi_FN:x1 | boi_MC:x51 | boi_PL:x11 | boi_RP:x24 | N/A |
| 22.4 | Derivative instruments (except options)/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x17 | boi_EF:x2 | boi_FN:x1 | boi_MC:x51 | boi_PL:x11 | boi_RP:x24 | N/A |
| 22.5 | Derivative instruments (except options)/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x9 | boi_EF:x2 | boi_FN:x1 | boi_MC:x51 | boi_PL:x11 | boi_RP:x24 | N/A |
| 22.6 | Derivative instruments (except options)/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | boi_FN:x2 | boi_MC:x51 | boi_PL:x11 | boi_RP:x24 | N/A |
| 22.7 | Derivative instruments (except options)/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | N/A | boi_MC:x51 | boi_PL:x11 | boi_RP:x24 | N/A |
| 23.1 | Options in the money, net (in terms of underlying asset)/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x5 | boi_EF:x2 | boi_FN:x1 | boi_MC:x49 | boi_PL:x11 | boi_RP:x24 | N/A |
| 23.2 | Options in the money, net (in terms of underlying asset)/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x6 | boi_EF:x2 | boi_FN:x1 | boi_MC:x49 | boi_PL:x11 | boi_RP:x24 | N/A |
| 23.3 | Options in the money, net (in terms of underlying asset)/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x16 | boi_EF:x2 | boi_FN:x1 | boi_MC:x49 | boi_PL:x11 | boi_RP:x24 | N/A |
| 23.4 | Options in the money, net (in terms of underlying asset)/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x17 | boi_EF:x2 | boi_FN:x1 | boi_MC:x49 | boi_PL:x11 | boi_RP:x24 | N/A |
| 23.5 | Options in the money, net (in terms of underlying asset)/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x9 | boi_EF:x2 | boi_FN:x1 | boi_MC:x49 | boi_PL:x11 | boi_RP:x24 | N/A |
| 23.6 | Options in the money, net (in terms of underlying asset)/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | boi_FN:x2 | boi_MC:x49 | boi_PL:x11 | boi_RP:x24 | N/A |
| 23.7 | Options in the money, net (in terms of underlying asset)/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | N/A | boi_MC:x49 | boi_PL:x11 | boi_RP:x24 | N/A |
| 24.1 | Options out of the money, net (in terms of underlying asset)/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x5 | boi_EF:x2 | boi_FN:x1 | boi_MC:x50 | boi_PL:x11 | boi_RP:x24 | N/A |
| 24.2 | Options out of the money, net (in terms of underlying asset)/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x6 | boi_EF:x2 | boi_FN:x1 | boi_MC:x50 | boi_PL:x11 | boi_RP:x24 | N/A |
| 24.3 | Options out of the money, net (in terms of underlying asset)/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x16 | boi_EF:x2 | boi_FN:x1 | boi_MC:x50 | boi_PL:x11 | boi_RP:x24 | N/A |
| 24.4 | Options out of the money, net (in terms of underlying asset)/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x17 | boi_EF:x2 | boi_FN:x1 | boi_MC:x50 | boi_PL:x11 | boi_RP:x24 | N/A |
| 24.5 | Options out of the money, net (in terms of underlying asset)/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x9 | boi_EF:x2 | boi_FN:x1 | boi_MC:x50 | boi_PL:x11 | boi_RP:x24 | N/A |
| 24.6 | Options out of the money, net (in terms of underlying asset)/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | boi_FN:x2 | boi_MC:x50 | boi_PL:x11 | boi_RP:x24 | N/A |
| 24.7 | Options out of the money, net (in terms of underlying asset)/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | N/A | boi_MC:x50 | boi_PL:x11 | boi_RP:x24 | N/A |
| r28.1 | Effect of non-hedging derivative instruments/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x5 | boi_EF:x2 | boi_FN:x1 | N/A | boi_PL:x13 | boi_RP:x24 | N/A |
| r28.2 | Effect of non-hedging derivative instruments/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x6 | boi_EF:x2 | boi_FN:x1 | N/A | boi_PL:x13 | boi_RP:x24 | N/A |
| r28.3 | Effect of non-hedging derivative instruments/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x16 | boi_EF:x2 | boi_FN:x1 | N/A | boi_PL:x13 | boi_RP:x24 | N/A |
| r28.4 | Effect of non-hedging derivative instruments/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x17 | boi_EF:x2 | boi_FN:x1 | N/A | boi_PL:x13 | boi_RP:x24 | N/A |
| r28.5 | Effect of non-hedging derivative instruments/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x9 | boi_EF:x2 | boi_FN:x1 | N/A | boi_PL:x13 | boi_RP:x24 | N/A |
| r28.6 | Effect of non-hedging derivative instruments/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | boi_FN:x2 | N/A | boi_PL:x13 | boi_RP:x24 | N/A |
| r28.7 | Effect of non-hedging derivative instruments/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | N/A | N/A | boi_PL:x13 | boi_RP:x24 | N/A |
| 25.1 | Derivative instruments (except options)/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x5 | boi_EF:x2 | boi_FN:x1 | boi_MC:x51 | boi_PL:x13 | boi_RP:x24 | N/A |
| 25.2 | Derivative instruments (except options)/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x6 | boi_EF:x2 | boi_FN:x1 | boi_MC:x51 | boi_PL:x13 | boi_RP:x24 | N/A |
| 25.3 | Derivative instruments (except options)/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x16 | boi_EF:x2 | boi_FN:x1 | boi_MC:x51 | boi_PL:x13 | boi_RP:x24 | N/A |
| 25.4 | Derivative instruments (except options)/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x17 | boi_EF:x2 | boi_FN:x1 | boi_MC:x51 | boi_PL:x13 | boi_RP:x24 | N/A |
| 25.5 | Derivative instruments (except options)/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x9 | boi_EF:x2 | boi_FN:x1 | boi_MC:x51 | boi_PL:x13 | boi_RP:x24 | N/A |
| 25.6 | Derivative instruments (except options)/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | boi_FN:x2 | boi_MC:x51 | boi_PL:x13 | boi_RP:x24 | N/A |
| 25.7 | Derivative instruments (except options)/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | N/A | boi_MC:x51 | boi_PL:x13 | boi_RP:x24 | N/A |
| 26.1 | Options in the money ,net (in terms of underlying asset)/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x5 | boi_EF:x2 | boi_FN:x1 | boi_MC:x49 | boi_PL:x13 | boi_RP:x24 | N/A |
| 26.2 | Options in the money ,net (in terms of underlying asset)/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x6 | boi_EF:x2 | boi_FN:x1 | boi_MC:x49 | boi_PL:x13 | boi_RP:x24 | N/A |
| 26.3 | Options in the money ,net (in terms of underlying asset)/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x16 | boi_EF:x2 | boi_FN:x1 | boi_MC:x49 | boi_PL:x13 | boi_RP:x24 | N/A |
| 26.4 | Options in the money ,net (in terms of underlying asset)/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x17 | boi_EF:x2 | boi_FN:x1 | boi_MC:x49 | boi_PL:x13 | boi_RP:x24 | N/A |
| 26.5 | Options in the money ,net (in terms of underlying asset)/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x9 | boi_EF:x2 | boi_FN:x1 | boi_MC:x49 | boi_PL:x13 | boi_RP:x24 | N/A |
| 26.6 | Options in the money ,net (in terms of underlying asset)/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | boi_FN:x2 | boi_MC:x49 | boi_PL:x13 | boi_RP:x24 | N/A |
| 26.7 | Options in the money ,net (in terms of underlying asset)/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | N/A | boi_MC:x49 | boi_PL:x13 | boi_RP:x24 | N/A |
| 27.1 | Options out of the money,net (in terms of underlying asset)/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x5 | boi_EF:x2 | boi_FN:x1 | boi_MC:x50 | boi_PL:x13 | boi_RP:x24 | N/A |
| 27.2 | Options out of the money,net (in terms of underlying asset)/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x6 | boi_EF:x2 | boi_FN:x1 | boi_MC:x50 | boi_PL:x13 | boi_RP:x24 | N/A |
| 27.3 | Options out of the money,net (in terms of underlying asset)/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x16 | boi_EF:x2 | boi_FN:x1 | boi_MC:x50 | boi_PL:x13 | boi_RP:x24 | N/A |
| 27.4 | Options out of the money,net (in terms of underlying asset)/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x17 | boi_EF:x2 | boi_FN:x1 | boi_MC:x50 | boi_PL:x13 | boi_RP:x24 | N/A |
| 27.5 | Options out of the money,net (in terms of underlying asset)/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x9 | boi_EF:x2 | boi_FN:x1 | boi_MC:x50 | boi_PL:x13 | boi_RP:x24 | N/A |
| 27.6 | Options out of the money,net (in terms of underlying asset)/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | boi_FN:x2 | boi_MC:x50 | boi_PL:x13 | boi_RP:x24 | N/A |
| 27.7 | Options out of the money,net (in terms of underlying asset)/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x2 | N/A | boi_MC:x50 | boi_PL:x13 | boi_RP:x24 | N/A |
| 28.1 | Total/Unlinked | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 28.2 | Total/Linked to the CPI | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 28.3 | Total/In U.S. dollars | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x16 | boi_EF:x1 | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 28.4 | Total/In Euro | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x17 | boi_EF:x1 | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 28.5 | Total/In other currencies | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_CU:x9 | boi_EF:x1 | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 28.6 | Total/Non Monetary items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x1 | boi_FN:x2 | N/A | N/A | boi_RP:x24 | N/A |
| 28.7 | Total/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 29.1 | Options in the money, net (in terms of underlying asset)/Unlinked | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x49 | N/A | boi_RP:x24 | N/A |
| 29.2 | Options in the money, net (in terms of underlying asset)/Linked to the CPI | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x49 | N/A | boi_RP:x24 | N/A |
| 29.3 | Options in the money, net (in terms of underlying asset)/In U.S. dollars | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x49 | N/A | boi_RP:x24 | N/A |
| 29.4 | Options in the money, net (in terms of underlying asset)/In Euro | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x49 | N/A | boi_RP:x24 | N/A |
| 29.5 | Options in the money, net (in terms of underlying asset)/In other currencies | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x49 | N/A | boi_RP:x24 | N/A |
| 29.6 | Options in the money, net (in terms of underlying asset)/Non Monetary items | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x49 | N/A | boi_RP:x24 | N/A |
| 29.7 | Options in the money, net (in terms of underlying asset)/Total | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x49 | N/A | boi_RP:x24 | N/A |
| 30.1 | Options out of the money, net (in terms of underlying asset)/Unlinked | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x50 | N/A | boi_RP:x24 | N/A |
| 30.2 | Options out of the money, net (in terms of underlying asset)/Linked to the CPI | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x50 | N/A | boi_RP:x24 | N/A |
| 30.3 | Options out of the money, net (in terms of underlying asset)/In U.S. dollars | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x50 | N/A | boi_RP:x24 | N/A |
| 30.4 | Options out of the money, net (in terms of underlying asset)/In Euro | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | boi_MC:x50 | N/A | boi_RP:x24 | N/A |
| 30.5 | Options out of the money, net (in terms of underlying asset)/In other currencies | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | boi_MC:x50 | N/A | boi_RP:x24 | N/A |
| 30.6 | Options out of the money, net (in terms of underlying asset)/Non Monetary items | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | N/A | N/A | boi_FN:x2 | boi_MC:x50 | N/A | boi_RP:x24 | N/A |
| 30.7 | Options out of the money, net (in terms of underlying asset)/Total | boi_met:mi556 | xbrli:monetaryItemType | instant | boi_BC:x29 | boi_CS:x2 | N/A | N/A | N/A | boi_MC:x50 | N/A | boi_RP:x24 | N/A |
| 31.1 | Financial capital/Unlinked | boi_met:mi201 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 31.2 | Financial capital/Linked to the CPI | boi_met:mi201 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 31.3 | Financial capital/In U.S. dollars | boi_met:mi201 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 31.4 | Financial capital/In Euro | boi_met:mi201 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_CU:x17 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 31.5 | Financial capital/In other currencies | boi_met:mi201 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_CU:x9 | N/A | boi_FN:x1 | N/A | N/A | boi_RP:x24 | N/A |
| 31.6 | Financial capital/Non Monetary items | boi_met:mi201 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | boi_FN:x2 | N/A | N/A | boi_RP:x24 | N/A |
| 31.7 | Financial capital/Total | boi_met:mi201 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 | N/A |