| r0.1 | label_boi_a2/Settlement sector | | | | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| r0.2 | label_boi_a2/Issuing sector | | | | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| r0.3 | label_boi_a2/Financing sector | | | | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| r0.4 | label_boi_a2/Other sector | | | | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| r0.5 | label_boi_a2/Adjustments | | | | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| r0.6 | label_boi_a2/Total, consolidated | | | | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| r1.1 | Income/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| r1.2 | Income/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| r1.3 | Income/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| r1.4 | Income/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| r1.5 | Income/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| r1.6 | Income/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 1.1 | Extrasectoral fees/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | boi_SE:x44 |
| 1.2 | Extrasectoral fees/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | boi_SE:x44 |
| 1.3 | Extrasectoral fees/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | boi_SE:x44 |
| 1.4 | Extrasectoral fees/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | boi_SE:x44 |
| 1.5 | Extrasectoral fees/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | boi_SE:x44 |
| 1.6 | Extrasectoral fees/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | N/A | boi_SE:x44 |
| 2.1 | Intersectoral fees/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | boi_SE:x45 |
| 2.2 | Intersectoral fees/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | boi_SE:x45 |
| 2.3 | Intersectoral fees/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | boi_SE:x45 |
| 2.4 | Intersectoral fees/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | boi_SE:x45 |
| 2.5 | Intersectoral fees/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | boi_SE:x45 |
| 2.6 | Intersectoral fees/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | N/A | boi_SE:x45 |
| 3.1 | Total/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 3.2 | Total/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 3.3 | Total/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 3.4 | Total/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 3.5 | Total/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 3.6 | Total/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x281 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 4.1 | Net interest income/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x125 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 4.2 | Net interest income/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x125 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 4.3 | Net interest income/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x125 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 4.4 | Net interest income/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x125 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 4.5 | Net interest income/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x125 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 4.6 | Net interest income/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x125 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 5.1 | Other income/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x456 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 5.2 | Other income/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x456 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 5.3 | Other income/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x456 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 5.4 | Other income/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x456 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 5.5 | Other income/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x456 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 5.6 | Other income/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x456 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 6.1 | Total income/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x455 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 6.2 | Total income/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x455 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 6.3 | Total income/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x455 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 6.4 | Total income/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x455 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 6.5 | Total income/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x455 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 6.6 | Total income/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x455 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| r8.1 | Expenses/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| r8.2 | Expenses/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| r8.3 | Expenses/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| r8.4 | Expenses/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| r8.5 | Expenses/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| r8.6 | Expenses/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 7.1 | On account of credit loss/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x126 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 7.2 | On account of credit loss/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x126 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 7.3 | On account of credit loss/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x126 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 7.4 | On account of credit loss/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x126 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 7.5 | On account of credit loss/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x126 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 7.6 | On account of credit loss/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x126 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 8.1 | Operational/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x458 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 8.2 | Operational/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x458 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 8.3 | Operational/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x458 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 8.4 | Operational/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x458 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 8.5 | Operational/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x458 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 8.6 | Operational/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x458 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 9.1 | Sales and marketing/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x459 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 9.2 | Sales and marketing/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x459 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 9.3 | Sales and marketing/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x459 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 9.4 | Sales and marketing/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x459 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 9.5 | Sales and marketing/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x459 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 9.6 | Sales and marketing/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x459 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 10.1 | Administrative and general/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x460 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 10.2 | Administrative and general/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x460 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 10.3 | Administrative and general/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x460 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 10.4 | Administrative and general/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x460 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 10.5 | Administrative and general/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x460 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 10.6 | Administrative and general/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x460 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 11.1 | Payments to banks/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x461 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 11.2 | Payments to banks/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x461 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 11.3 | Payments to banks/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x461 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 11.4 | Payments to banks/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x461 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 11.5 | Payments to banks/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x461 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 11.6 | Payments to banks/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x461 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 12.1 | Total expenses/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x457 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 12.2 | Total expenses/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x457 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 12.3 | Total expenses/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x457 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 12.4 | Total expenses/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x457 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 12.5 | Total expenses/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x457 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 12.6 | Total expenses/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x457 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 13.1 | Pre-tax profit/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x123 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 13.2 | Pre-tax profit/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x123 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 13.3 | Pre-tax profit/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x123 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 13.4 | Pre-tax profit/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x123 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 13.5 | Pre-tax profit/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x123 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 13.6 | Pre-tax profit/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x123 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 14.1 | Provision for taxes on profit/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x190 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 14.2 | Provision for taxes on profit/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x190 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 14.3 | Provision for taxes on profit/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x190 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 14.4 | Provision for taxes on profit/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x190 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 14.5 | Provision for taxes on profit/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x190 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 14.6 | Provision for taxes on profit/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x190 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 15.1 | Post-tax profit/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x122 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 15.2 | Post-tax profit/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x122 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 15.3 | Post-tax profit/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x122 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 15.4 | Post-tax profit/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x122 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 15.5 | Post-tax profit/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x122 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 15.6 | Post-tax profit/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x122 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 16.1 | Company's share in profit of included companies after effect of tax/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x191 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 16.2 | Company's share in profit of included companies after effect of tax/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x191 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 16.3 | Company's share in profit of included companies after effect of tax/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x191 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 16.4 | Company's share in profit of included companies after effect of tax/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x191 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 16.5 | Company's share in profit of included companies after effect of tax/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x191 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 16.6 | Company's share in profit of included companies after effect of tax/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x191 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| r19.1 | Net profit/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| r19.2 | Net profit/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| r19.3 | Net profit/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| r19.4 | Net profit/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| r19.5 | Net profit/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| r19.6 | Net profit/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 17.1 | Before attribution to holders of noncontrolling rights/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 17.2 | Before attribution to holders of noncontrolling rights/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 17.3 | Before attribution to holders of noncontrolling rights/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 17.4 | Before attribution to holders of noncontrolling rights/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 17.5 | Before attribution to holders of noncontrolling rights/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 17.6 | Before attribution to holders of noncontrolling rights/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 18.1 | Attribution to holders of noncontrolling rights/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 18.2 | Attribution to holders of noncontrolling rights/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 18.3 | Attribution to holders of noncontrolling rights/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 18.4 | Attribution to holders of noncontrolling rights/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 18.5 | Attribution to holders of noncontrolling rights/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 18.6 | Attribution to holders of noncontrolling rights/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 19.1 | Attributed to holders of shares in credit card company/Settlement sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 19.2 | Attributed to holders of shares in credit card company/Issuing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 19.3 | Attributed to holders of shares in credit card company/Financing sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 19.4 | Attributed to holders of shares in credit card company/Other sector | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 19.5 | Attributed to holders of shares in credit card company/Adjustments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 19.6 | Attributed to holders of shares in credit card company/Total, consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 20.1 | Return on equity (pct. of net profit in weighted gross equity)/Settlement sector | boi_met:pd85 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 20.2 | Return on equity (pct. of net profit in weighted gross equity)/Issuing sector | boi_met:pd85 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 20.3 | Return on equity (pct. of net profit in weighted gross equity)/Financing sector | boi_met:pd85 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 20.4 | Return on equity (pct. of net profit in weighted gross equity)/Other sector | boi_met:pd85 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 20.5 | Return on equity (pct. of net profit in weighted gross equity)/Adjustments | boi_met:pd85 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 20.6 | Return on equity (pct. of net profit in weighted gross equity)/Total, consolidated | boi_met:pd85 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 21.1 | Avg. balance of assets2/Settlement sector | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x1 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 21.2 | Avg. balance of assets2/Issuing sector | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x1 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 21.3 | Avg. balance of assets2/Financing sector | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x1 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 21.4 | Avg. balance of assets2/Other sector | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x1 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 21.5 | Avg. balance of assets2/Adjustments | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x1 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 21.6 | Avg. balance of assets2/Total, consolidated | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x1 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 22.1 | Thereof: investmetns in included companies/Settlement sector | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x54 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 22.2 | Thereof: investmetns in included companies/Issuing sector | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x54 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 22.3 | Thereof: investmetns in included companies/Financing sector | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x54 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 22.4 | Thereof: investmetns in included companies/Other sector | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x54 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 22.5 | Thereof: investmetns in included companies/Adjustments | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x54 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 22.6 | Thereof: investmetns in included companies/Total, consolidated | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x54 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 23.1 | Avg. balance of liabilities/Settlement sector | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_MC:x3 | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 23.2 | Avg. balance of liabilities/Issuing sector | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_MC:x3 | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 23.3 | Avg. balance of liabilities/Financing sector | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_MC:x3 | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 23.4 | Avg. balance of liabilities/Other sector | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_MC:x3 | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 23.5 | Avg. balance of liabilities/Adjustments | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_MC:x3 | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 23.6 | Avg. balance of liabilities/Total, consolidated | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_MC:x3 | boi_MU:x1 | boi_RP:x25 | N/A | N/A |
| 24.1 | Avg. balance of risk assets/Settlement sector | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x74 | N/A |
| 24.2 | Avg. balance of risk assets/Issuing sector | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x73 | N/A |
| 24.3 | Avg. balance of risk assets/Financing sector | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x72 | N/A |
| 24.4 | Avg. balance of risk assets/Other sector | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x75 | N/A |
| 24.5 | Avg. balance of risk assets/Adjustments | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x76 | N/A |
| 24.6 | Avg. balance of risk assets/Total, consolidated | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x25 | N/A | N/A |