| r0.1 | label_boi_a2/Non-indexed | | | | N/A | boi_CS:x2 | boi_CU:x5 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 |
| r0.2 | label_boi_a2/CPI-indexed | | | | N/A | boi_CS:x2 | boi_CU:x6 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 |
| r0.3 | label_boi_a2/USD | | | | N/A | boi_CS:x2 | boi_CU:x16 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 |
| r0.4 | label_boi_a2/Other | | | | N/A | boi_CS:x2 | boi_CU:x33 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 |
| r0.5 | label_boi_a2/Total | | | | N/A | boi_CS:x2 | N/A | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 |
| r1.1 | Fair value of financial instruments before effect of hypothetical changes in interest rates/Non-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_CU:x5 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 |
| r1.2 | Fair value of financial instruments before effect of hypothetical changes in interest rates/CPI-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_CU:x6 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 |
| r1.3 | Fair value of financial instruments before effect of hypothetical changes in interest rates/USD | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_CU:x16 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 |
| r1.4 | Fair value of financial instruments before effect of hypothetical changes in interest rates/Other | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_CU:x33 | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 |
| r1.5 | Fair value of financial instruments before effect of hypothetical changes in interest rates/Total | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 1.1 | Financial assets 1/Non-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x46 | boi_PL:x9 | N/A | boi_RP:x24 |
| 1.2 | Financial assets 1/CPI-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x46 | boi_PL:x9 | N/A | boi_RP:x24 |
| 1.3 | Financial assets 1/USD | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x46 | boi_PL:x9 | N/A | boi_RP:x24 |
| 1.4 | Financial assets 1/Other | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_CU:x33 | N/A | boi_FN:x1 | boi_MC:x46 | boi_PL:x9 | N/A | boi_RP:x24 |
| 1.5 | Financial assets 1/Total | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_FN:x1 | boi_MC:x46 | boi_PL:x9 | N/A | boi_RP:x24 |
| 2.1 | Receivable amounts in respect of derivative, financial instruments complex and off-balance-sheet financial instruments/Non-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x888 | N/A | N/A | boi_RP:x24 |
| 2.2 | Receivable amounts in respect of derivative, financial instruments complex and off-balance-sheet financial instruments/CPI-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x888 | N/A | N/A | boi_RP:x24 |
| 2.3 | Receivable amounts in respect of derivative, financial instruments complex and off-balance-sheet financial instruments/USD | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x888 | N/A | N/A | boi_RP:x24 |
| 2.4 | Receivable amounts in respect of derivative, financial instruments complex and off-balance-sheet financial instruments/Other | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | boi_CU:x33 | N/A | boi_FN:x1 | boi_MC:x888 | N/A | N/A | boi_RP:x24 |
| 2.5 | Receivable amounts in respect of derivative, financial instruments complex and off-balance-sheet financial instruments/Total | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | N/A | boi_FN:x1 | boi_MC:x888 | N/A | N/A | boi_RP:x24 |
| 3.1 | Financial liabilities 1/Non-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x47 | boi_PL:x9 | N/A | boi_RP:x24 |
| 3.2 | Financial liabilities 1/CPI-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x47 | boi_PL:x9 | N/A | boi_RP:x24 |
| 3.3 | Financial liabilities 1/USD | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x47 | boi_PL:x9 | N/A | boi_RP:x24 |
| 3.4 | Financial liabilities 1/Other | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_CU:x33 | N/A | boi_FN:x1 | boi_MC:x47 | boi_PL:x9 | N/A | boi_RP:x24 |
| 3.5 | Financial liabilities 1/Total | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | boi_FN:x1 | boi_MC:x47 | boi_PL:x9 | N/A | boi_RP:x24 |
| 4.1 | Amounts payable in respect ofderivative, financial instruments complex and off-balance-sheet financial instruments/Non-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | boi_MC:x890 | N/A | N/A | boi_RP:x24 |
| 4.2 | Amounts payable in respect ofderivative, financial instruments complex and off-balance-sheet financial instruments/CPI-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | boi_MC:x890 | N/A | N/A | boi_RP:x24 |
| 4.3 | Amounts payable in respect ofderivative, financial instruments complex and off-balance-sheet financial instruments/USD | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | boi_MC:x890 | N/A | N/A | boi_RP:x24 |
| 4.4 | Amounts payable in respect ofderivative, financial instruments complex and off-balance-sheet financial instruments/Other | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | boi_CU:x33 | N/A | boi_FN:x1 | boi_MC:x890 | N/A | N/A | boi_RP:x24 |
| 4.5 | Amounts payable in respect ofderivative, financial instruments complex and off-balance-sheet financial instruments/Total | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | N/A | boi_FN:x1 | boi_MC:x890 | N/A | N/A | boi_RP:x24 |
| 5.1 | Net fair value of financial instruments/Non-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 |
| 5.2 | Net fair value of financial instruments/CPI-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 |
| 5.3 | Net fair value of financial instruments/USD | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x16 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 |
| 5.4 | Net fair value of financial instruments/Other | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x33 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 |
| 5.5 | Net fair value of financial instruments/Total | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 |
| 6.1 | The effect of liabilities for workers' rights/Non-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x5 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 6.2 | The effect of liabilities for workers' rights/CPI-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x5 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 6.3 | The effect of liabilities for workers' rights/USD | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x16 | boi_EF:x5 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 6.4 | The effect of liabilities for workers' rights/Other | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x33 | boi_EF:x5 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 6.5 | The effect of liabilities for workers' rights/Total | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x5 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 7.1 | The effect of spreading deposits into periods by request/Non-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x6 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 7.2 | The effect of spreading deposits into periods by request/CPI-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x6 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 7.3 | The effect of spreading deposits into periods by request/USD | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x16 | boi_EF:x6 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 7.4 | The effect of spreading deposits into periods by request/Other | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x33 | boi_EF:x6 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 7.5 | The effect of spreading deposits into periods by request/Total | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x6 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 8.1 | Adjusted net fair value1/Non-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x7 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 8.2 | Adjusted net fair value1/CPI-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x7 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 8.3 | Adjusted net fair value1/USD | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x16 | boi_EF:x7 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 8.4 | Adjusted net fair value1/Other | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x33 | boi_EF:x7 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 8.5 | Adjusted net fair value1/Total | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x7 | N/A | N/A | N/A | N/A | boi_RP:x24 |
| 9.1 | of which: banking portfolio/Non-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x7 | N/A | N/A | N/A | boi_PL:x66 | boi_RP:x24 |
| 9.2 | of which: banking portfolio/CPI-indexed | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x7 | N/A | N/A | N/A | boi_PL:x66 | boi_RP:x24 |
| 9.3 | of which: banking portfolio/USD | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x16 | boi_EF:x7 | N/A | N/A | N/A | boi_PL:x66 | boi_RP:x24 |
| 9.4 | of which: banking portfolio/Other | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x33 | boi_EF:x7 | N/A | N/A | N/A | boi_PL:x66 | boi_RP:x24 |
| 9.5 | of which: banking portfolio/Total | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x7 | N/A | N/A | N/A | boi_PL:x66 | boi_RP:x24 |