| r0.1 | label_boi_a2/Software | | | | N/A | boi_CS:x2 | N/A | boi_MC:x651 | N/A | boi_SE:x90 |
| r0.2 | label_boi_a2/Hardware | | | | N/A | boi_CS:x2 | N/A | boi_MC:x676 | N/A | boi_SE:x90 |
| r0.3 | label_boi_a2/Other | | | | N/A | boi_CS:x2 | N/A | boi_MC:x677 | N/A | boi_SE:x90 |
| r0.4 | label_boi_a2/Total | | | | N/A | boi_CS:x2 | N/A | boi_MC:x1 | N/A | boi_SE:x90 |
| r1.1 | IT expenditure included in earnings statement/Software | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | N/A | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| r1.2 | IT expenditure included in earnings statement/Hardware | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | N/A | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| r1.3 | IT expenditure included in earnings statement/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | N/A | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| r1.4 | IT expenditure included in earnings statement/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | N/A | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| 1.1 | Wage and related expenditure/Software | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x161 | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| 1.2 | Wage and related expenditure/Hardware | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x161 | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| 1.3 | Wage and related expenditure/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x161 | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| 1.4 | Wage and related expenditure/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x161 | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| 2.1 | Expenditure on purchases or use licenses not capitalized to assets/Software | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x674 | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| 2.2 | Expenditure on purchases or use licenses not capitalized to assets/Hardware | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x674 | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| 2.3 | Expenditure on purchases or use licenses not capitalized to assets/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x674 | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| 2.4 | Expenditure on purchases or use licenses not capitalized to assets/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x674 | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| 3.1 | Outsourcing expenditure/Software | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x675 | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| 3.2 | Outsourcing expenditure/Hardware | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x675 | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| 3.3 | Outsourcing expenditure/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x675 | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| 3.4 | Outsourcing expenditure/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x675 | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| 4.1 | Depreciation expenditure/Software | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x668 | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| 4.2 | Depreciation expenditure/Hardware | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x668 | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| 4.3 | Depreciation expenditure/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x668 | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| 4.4 | Depreciation expenditure/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x668 | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| 5.1 | Other expenditure/Software | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x921 | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| 5.2 | Other expenditure/Hardware | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x921 | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| 5.3 | Other expenditure/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x921 | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| 5.4 | Other expenditure/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x921 | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| 6.1 | Total/Software | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x920 | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| 6.2 | Total/Hardware | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x920 | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| 6.3 | Total/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x920 | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| 6.4 | Total/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x920 | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| r8.1 | Additions to assets for IT not imputed as expenditure/Software | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| r8.2 | Additions to assets for IT not imputed as expenditure/Hardware | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| r8.3 | Additions to assets for IT not imputed as expenditure/Other | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| r8.4 | Additions to assets for IT not imputed as expenditure/Total | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| 7.1 | Wage and related costs/Software | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x678 | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| 7.2 | Wage and related costs/Hardware | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x678 | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| 7.3 | Wage and related costs/Other | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x678 | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| 7.4 | Wage and related costs/Total | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x678 | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| 8.1 | Outsourcing costs/Software | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x679 | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| 8.2 | Outsourcing costs/Hardware | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x679 | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| 8.3 | Outsourcing costs/Other | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x679 | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| 8.4 | Outsourcing costs/Total | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x679 | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| 9.1 | Purchase or license maintenance costs 3,4/Software | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x680 | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| 9.2 | Purchase or license maintenance costs 3,4/Hardware | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x680 | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| 9.3 | Purchase or license maintenance costs 3,4/Other | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x680 | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| 9.4 | Purchase or license maintenance costs 3,4/Total | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x680 | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| 10.1 | Equipment, building, and land costs/Software | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x681 | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| 10.2 | Equipment, building, and land costs/Hardware | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x681 | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| 10.3 | Equipment, building, and land costs/Other | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x681 | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| 10.4 | Equipment, building, and land costs/Total | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x681 | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| 11.1 | Other costs/Software | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x682 | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| 11.2 | Other costs/Hardware | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x682 | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| 11.3 | Other costs/Other | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x682 | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| 11.4 | Other costs/Total | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x682 | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| 12.1 | Total/Software | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x1 | boi_MC:x651 | boi_MU:x1 | boi_SE:x90 |
| 12.2 | Total/Hardware | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x1 | boi_MC:x676 | boi_MU:x1 | boi_SE:x90 |
| 12.3 | Total/Other | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x1 | boi_MC:x677 | boi_MU:x1 | boi_SE:x90 |
| 12.4 | Total/Total | boi_met:md375 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x1 | boi_MC:x1 | boi_MU:x1 | boi_SE:x90 |
| r15.1 | Balances of assets on account of IT/Software | | | | N/A | boi_CS:x2 | N/A | boi_MC:x651 | N/A | boi_SE:x90 |
| r15.2 | Balances of assets on account of IT/Hardware | | | | N/A | boi_CS:x2 | N/A | boi_MC:x676 | N/A | boi_SE:x90 |
| r15.3 | Balances of assets on account of IT/Other | | | | N/A | boi_CS:x2 | N/A | boi_MC:x677 | N/A | boi_SE:x90 |
| r15.4 | Balances of assets on account of IT/Total | | | | N/A | boi_CS:x2 | N/A | boi_MC:x1 | N/A | boi_SE:x90 |
| 13.1 | Total amortized cost/Software | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x1 | boi_MC:x651 | N/A | boi_SE:x90 |
| 13.2 | Total amortized cost/Hardware | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x1 | boi_MC:x676 | N/A | boi_SE:x90 |
| 13.3 | Total amortized cost/Other | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x1 | boi_MC:x677 | N/A | boi_SE:x90 |
| 13.4 | Total amortized cost/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x1 | boi_MC:x1 | N/A | boi_SE:x90 |
| 14.1 | Thereof: on account of wages and related/Software | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x678 | boi_MC:x651 | N/A | boi_SE:x90 |
| 14.2 | Thereof: on account of wages and related/Hardware | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x678 | boi_MC:x676 | N/A | boi_SE:x90 |
| 14.3 | Thereof: on account of wages and related/Other | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x678 | boi_MC:x677 | N/A | boi_SE:x90 |
| 14.4 | Thereof: on account of wages and related/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x678 | boi_MC:x1 | N/A | boi_SE:x90 |