| r0.1 | label_boi_a2/Specific risk | | | | boi_BC:x16 | boi_CS:x2 | N/A | boi_RT:x7 | N/A |
| r0.2 | label_boi_a2/General risk | | | | boi_BC:x16 | boi_CS:x2 | N/A | boi_RT:x6 | N/A |
| r0.3 | label_boi_a2/Total | | | | boi_BC:x16 | boi_CS:x2 | N/A | N/A | N/A |
| 1.1 | For interest risks/Specific risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x971 | boi_RT:x7 | boi_RT:x8 |
| 1.2 | For interest risks/General risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x971 | boi_RT:x6 | boi_RT:x8 |
| 1.3 | For interest risks/Total | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x971 | N/A | boi_RT:x8 |
| 2.1 | For shares risk/Specific risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x971 | boi_RT:x7 | boi_RT:x9 |
| 2.2 | For shares risk/General risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x971 | boi_RT:x6 | boi_RT:x9 |
| 2.3 | For shares risk/Total | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x971 | N/A | boi_RT:x9 |
| 3.1 | For foreign-currency risk/Specific risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x971 | boi_RT:x7 | boi_RT:x10 |
| 3.2 | For foreign-currency risk/General risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x971 | boi_RT:x6 | boi_RT:x10 |
| 3.3 | For foreign-currency risk/Total | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x971 | N/A | boi_RT:x10 |
| r4.1 | Options:/Specific risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | boi_RT:x7 | N/A |
| r4.2 | Options:/General risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | boi_RT:x6 | N/A |
| r4.3 | Options:/Total | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | N/A | N/A |
| 4.1 | On interest/Specific risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | boi_RT:x7 | boi_RT:x8 |
| 4.2 | On interest/General risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | boi_RT:x6 | boi_RT:x8 |
| 4.3 | On interest/Total | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | N/A | boi_RT:x8 |
| 5.1 | On shares/Specific risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | boi_RT:x7 | boi_RT:x9 |
| 5.2 | On shares/General risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | boi_RT:x6 | boi_RT:x9 |
| 5.3 | On shares/Total | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | N/A | boi_RT:x9 |
| 6.1 | On foreign currency/Specific risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | boi_RT:x7 | boi_RT:x10 |
| 6.2 | On foreign currency/General risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | boi_RT:x6 | boi_RT:x10 |
| 6.3 | On foreign currency/Total | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | N/A | boi_RT:x10 |
| 7.1 | Total/Specific risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | boi_RT:x7 | boi_RT:x3 |
| 7.2 | Total/General risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | boi_RT:x6 | boi_RT:x3 |
| 7.3 | Total/Total | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x48 | N/A | boi_RT:x3 |
| 8.1 | Total capital requirement for market risks/Specific risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x57 | boi_RT:x7 | boi_RT:x3 |
| 8.2 | Total capital requirement for market risks/General risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x57 | boi_RT:x6 | boi_RT:x3 |
| 8.3 | Total capital requirement for market risks/Total | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x57 | N/A | boi_RT:x3 |
| r10.1 | Calculation approach/Specific risk | | | | boi_BC:x16 | boi_CS:x2 | N/A | boi_RT:x7 | N/A |
| r10.2 | Calculation approach/General risk | | | | boi_BC:x16 | boi_CS:x2 | N/A | boi_RT:x6 | N/A |
| r10.3 | Calculation approach/Total | | | | boi_BC:x16 | boi_CS:x2 | N/A | N/A | N/A |
| 9.1 | For interest risks/Specific risk | boi_met:ii34 | xbrli:integerItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RT:x7 | N/A |
| 9.2 | For interest risks/General risk | boi_met:ii34 | xbrli:integerItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RT:x6 | N/A |
| 9.3 | For interest risks/Total | boi_met:ii34 | xbrli:integerItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | N/A | N/A |
| 10.1 | For options/Specific risk | boi_met:ii35 | xbrli:integerItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RT:x7 | N/A |
| 10.2 | For options/General risk | boi_met:ii35 | xbrli:integerItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RT:x6 | N/A |
| 10.3 | For options/Total | boi_met:ii35 | xbrli:integerItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | N/A | N/A |
| 11.1 | Capital charge for CVA risk/Specific risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RT:x7 | boi_RT:x4 |
| 11.2 | Capital charge for CVA risk/General risk | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RT:x6 | boi_RT:x4 |
| 11.3 | Capital charge for CVA risk/Total | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | N/A | boi_RT:x4 |