| r0.1 | label_boi_a2/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_RP:x24 |
| r0.2 | label_boi_a2/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_RP:x24 |
| 1.1 | Deferred taxes due, net/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x430 | boi_RP:x24 |
| 1.2 | Deferred taxes due, net/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x430 | boi_RP:x24 |
| 2.1 | Surplus advances remitted to income tax over current provision/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x431 | boi_RP:x24 |
| 2.2 | Surplus advances remitted to income tax over current provision/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x431 | boi_RP:x24 |
| 3.1 | Surplus of asset plans over the employee benefit obligations/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x432 | boi_RP:x24 |
| 3.2 | Surplus of asset plans over the employee benefit obligations/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x432 | boi_RP:x24 |
| r4.1 | Balance of amortizable expenditure/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_RP:x24 |
| r4.2 | Balance of amortizable expenditure/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_RP:x24 |
| 4.1 | Intangible property (goodwill)/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x837 | boi_RP:x24 |
| 4.2 | Intangible property (goodwill)/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x837 | boi_RP:x24 |
| 5.1 | (Intellectual property rights (patents/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x869 | boi_RP:x24 |
| 5.2 | (Intellectual property rights (patents/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x869 | boi_RP:x24 |
| 6.1 | Rights to hold and use customer databases/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x870 | boi_RP:x24 |
| 6.2 | Rights to hold and use customer databases/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x870 | boi_RP:x24 |
| 7.1 | Other expenses for amortization/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x871 | boi_RP:x24 |
| 7.2 | Other expenses for amortization/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x871 | boi_RP:x24 |
| 8.1 | Total amortizable expenses/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x19 | boi_RP:x24 |
| 8.2 | Total amortizable expenses/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x19 | boi_RP:x24 |
| 9.1 | Credit balances on account of derivatives (excl. embedded derivatives)/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x18 | boi_RP:x24 |
| 9.2 | Credit balances on account of derivatives (excl. embedded derivatives)/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x18 | boi_RP:x24 |
| 10.1 | Usage-rights assets in respect of an operating lease/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x1150 | boi_RP:x24 |
| 10.2 | Usage-rights assets in respect of an operating lease/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x1150 | boi_RP:x24 |
| r12.1 | Other sums receivable and credit balances/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_RP:x24 |
| r12.2 | Other sums receivable and credit balances/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_RP:x24 |
| 11.1 | government institutions/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x873 | boi_RP:x24 |
| 11.2 | government institutions/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x873 | boi_RP:x24 |
| 12.1 | Investee companies (Included in consolidation)/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x863 | boi_RP:x24 |
| 12.2 | Investee companies (Included in consolidation)/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x863 | boi_RP:x24 |
| 13.1 | Dividend due/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x137 | boi_RP:x24 |
| 13.2 | Dividend due/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x137 | boi_RP:x24 |
| 14.1 | Employee loans/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x874 | boi_RP:x24 |
| 14.2 | Employee loans/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x874 | boi_RP:x24 |
| 15.1 | Income due/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x875 | boi_RP:x24 |
| 15.2 | Income due/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x875 | boi_RP:x24 |
| 16.1 | Prepaid expenses/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x876 | boi_RP:x24 |
| 16.2 | Prepaid expenses/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x876 | boi_RP:x24 |
| 17.1 | Other/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x872 | boi_RP:x24 |
| 17.2 | Other/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x872 | boi_RP:x24 |
| 18.1 | Total other sums receivable and credit balances/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x877 | boi_RP:x24 |
| 18.2 | Total other sums receivable and credit balances/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x877 | boi_RP:x24 |
| 19.1 | Total other assets/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x443 | boi_RP:x24 |
| 19.2 | Total other assets/Company | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x443 | boi_RP:x24 |