| r0.1 | label_boi_a2/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_RP:x19 |
| r0.2 | label_boi_a2/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | N/A | boi_RP:x24 |
| 1.1 | Net profit before attribution to non-controlling interests/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | N/A | N/A | boi_RP:x19 |
| 1.2 | Net profit before attribution to non-controlling interests/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | N/A | boi_RP:x24 |
| 2.1 | Net profit attributed to non-controlling interests/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x121 | N/A | N/A | boi_RP:x19 |
| 2.2 | Net profit attributed to non-controlling interests/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | N/A | boi_RP:x24 |
| 3.1 | Net profit attributed to owners of the credit card company/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | N/A | N/A | boi_RP:x19 |
| 3.2 | Net profit attributed to owners of the credit card company/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | N/A | boi_RP:x24 |
| r4.1 | profit (loss) before taxes/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | N/A | N/A | boi_RP:x19 |
| r4.2 | profit (loss) before taxes/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | boi_MU:x1 | N/A | boi_RP:x24 |
| 4.1 | Reconciliations in respect of securities available for sale according to fair value/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | N/A | boi_PL:x1 | boi_RP:x19 |
| 4.2 | Reconciliations in respect of securities available for sale according to fair value/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | boi_MU:x1 | boi_PL:x1 | boi_RP:x24 |
| 5.1 | Reconciliations from translation of financial statements, net, after tax effect and hedges/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | N/A | boi_PL:x30 | boi_RP:x19 |
| 5.2 | Reconciliations from translation of financial statements, net, after tax effect and hedges/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | boi_MU:x1 | boi_PL:x30 | boi_RP:x24 |
| 6.1 | Reconciliations of liabilities in respect of employee rights/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | N/A | boi_PL:x53 | boi_RP:x19 |
| 6.2 | Reconciliations of liabilities in respect of employee rights/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | boi_MU:x1 | boi_PL:x53 | boi_RP:x24 |
| 7.1 | Profits (losses) net, in respect of cash flow hedges/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | N/A | boi_PL:x27 | boi_RP:x19 |
| 7.2 | Profits (losses) net, in respect of cash flow hedges/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | boi_MU:x1 | boi_PL:x27 | boi_RP:x24 |
| 8.1 | Other overall profit (loss), before taxes/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | N/A | boi_PL:x36 | boi_RP:x19 |
| 8.2 | Other overall profit (loss), before taxes/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | boi_MU:x1 | boi_PL:x36 | boi_RP:x24 |
| 9.1 | Attributed tax effect/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x408 | N/A | boi_PL:x36 | boi_RP:x19 |
| 9.2 | Attributed tax effect/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x408 | boi_MU:x1 | boi_PL:x36 | boi_RP:x24 |
| 10.1 | Overall profit (loss) before attribution to minority interest, after taxes/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x399 | N/A | boi_PL:x36 | boi_RP:x19 |
| 10.2 | Overall profit (loss) before attribution to minority interest, after taxes/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x399 | boi_MU:x1 | boi_PL:x36 | boi_RP:x24 |
| 11.1 | Minus overall profit (loss) after attribution to minority interest, after taxes/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x399 | N/A | boi_PL:x36 | boi_RP:x19 |
| 11.2 | Minus overall profit (loss) after attribution to minority interest, after taxes/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x399 | boi_MU:x1 | boi_PL:x36 | boi_RP:x24 |
| 12.1 | Other overall profit attributed to owners of the credit card company, after taxes/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x399 | N/A | boi_PL:x36 | boi_RP:x19 |
| 12.2 | Other overall profit attributed to owners of the credit card company, after taxes/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x399 | boi_MU:x1 | boi_PL:x36 | boi_RP:x24 |
| 13.1 | Profit before attribution to non-controlling interests/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x407 | N/A | N/A | boi_RP:x19 |
| 13.2 | Profit before attribution to non-controlling interests/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x407 | boi_MU:x1 | N/A | boi_RP:x24 |
| 14.1 | Overall profit attributed to minority interest/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x407 | N/A | N/A | boi_RP:x19 |
| 14.2 | Overall profit attributed to minority interest/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x407 | boi_MU:x1 | N/A | boi_RP:x24 |
| 15.1 | Overall profit attributed to owners of the credit card company/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x407 | N/A | N/A | boi_RP:x19 |
| 15.2 | Overall profit attributed to owners of the credit card company/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x407 | boi_MU:x1 | N/A | boi_RP:x24 |