| r0.1 | label_boi_a2/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A |
| r0.2 | label_boi_a2/Income | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | boi_MU:x1 |
| r1.1 | Income from merchants/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A |
| r1.2 | Income from merchants/Income | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | boi_MU:x1 |
| 1.1 | Fees charged to businesses/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x464 | N/A |
| 1.2 | Fees charged to businesses/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x464 | boi_MU:x1 |
| 2.1 | Other income/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x465 | N/A |
| 2.2 | Other income/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x465 | boi_MU:x1 |
| 3.1 | Total income from businesses- gross/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x463 | N/A |
| 3.2 | Total income from businesses- gross/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x463 | boi_MU:x1 |
| 4.1 | Less fees to other issuers/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x10 | boi_CS:x2 | N/A | boi_MC:x597 | N/A |
| 4.2 | Less fees to other issuers/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | N/A | boi_MC:x597 | boi_MU:x1 |
| 5.1 | Total income from businesses/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x462 | N/A |
| 5.2 | Total income from businesses/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x462 | boi_MU:x1 |
| r7.1 | Income from credit card holders/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | N/A | N/A |
| r7.2 | Income from credit card holders/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | N/A | boi_MU:x1 |
| 6.1 | Issuer fees/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x468 | N/A |
| 6.2 | Issuer fees/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x468 | boi_MU:x1 |
| r9.1 | Total service fees, transactions abroad fees, and other/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | N/A | N/A |
| r9.2 | Total service fees, transactions abroad fees, and other/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | N/A | boi_MU:x1 |
| r10.1 | Service and other fees/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | N/A | N/A |
| r10.2 | Service and other fees/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | N/A | boi_MU:x1 |
| 7.1 | Card fees/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x541 | N/A |
| 7.2 | Card fees/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x541 | boi_MU:x1 |
| 8.1 | Deferred payment fee/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x542 | N/A |
| 8.2 | Deferred payment fee/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x542 | boi_MU:x1 |
| 9.1 | Handling of unjustified denial of transaction/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x544 | N/A |
| 9.2 | Handling of unjustified denial of transaction/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x544 | boi_MU:x1 |
| 10.1 | Prepayment or early payment of transactions/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x545 | N/A |
| 10.2 | Prepayment or early payment of transactions/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x545 | boi_MU:x1 |
| 11.1 | Issue of replacement card - regular issue/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x546 | N/A |
| 11.2 | Issue of replacement card - regular issue/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x546 | boi_MU:x1 |
| 12.1 | Issue of replacement card - immediate issue/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x547 | N/A |
| 12.2 | Issue of replacement card - immediate issue/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x547 | boi_MU:x1 |
| 13.1 | Purchase of foreign currency from money changer by means of credit card/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x548 | N/A |
| 13.2 | Purchase of foreign currency from money changer by means of credit card/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x548 | boi_MU:x1 |
| 14.1 | Charge fee/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x549 | N/A |
| 14.2 | Charge fee/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x549 | boi_MU:x1 |
| 15.1 | Notices/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x550 | N/A |
| 15.2 | Notices/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x550 | boi_MU:x1 |
| 16.1 | Lawyer's warning/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x551 | N/A |
| 16.2 | Lawyer's warning/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x551 | boi_MU:x1 |
| 17.1 | Issuance or printing of documents in digital database at customer request/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x552 | N/A |
| 17.2 | Issuance or printing of documents in digital database at customer request/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x552 | boi_MU:x1 |
| 18.1 | Tracing of documents/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x553 | N/A |
| 18.2 | Tracing of documents/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x553 | boi_MU:x1 |
| 19.1 | Early payment/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x554 | N/A |
| 19.2 | Early payment/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x554 | boi_MU:x1 |
| 20.1 | Other/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x1046 | N/A |
| 20.2 | Other/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x1046 | boi_MU:x1 |
| 21.1 | Total service and other fees/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x469 | N/A |
| 21.2 | Total service and other fees/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x1 | boi_MC:x469 | boi_MU:x1 |
| r26.1 | Fees on transactions abroad/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x2 | N/A | N/A |
| r26.2 | Fees on transactions abroad/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x2 | N/A | boi_MU:x1 |
| 22.1 | Foreign exchange transactions/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x2 | boi_MC:x1047 | N/A |
| 22.2 | Foreign exchange transactions/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x2 | boi_MC:x1047 | boi_MU:x1 |
| 23.1 | Withdrawals abroad/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x2 | boi_MC:x1048 | N/A |
| 23.2 | Withdrawals abroad/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x2 | boi_MC:x1048 | boi_MU:x1 |
| 24.1 | Total fees on account of transactions abroad/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x2 | boi_MC:x540 | N/A |
| 24.2 | Total fees on account of transactions abroad/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | boi_GA:x2 | boi_MC:x540 | boi_MU:x1 |
| 25.1 | Total service fees, transactions abroad fees, and other/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x538 | N/A |
| 25.2 | Total service fees, transactions abroad fees, and other/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x538 | boi_MU:x1 |
| 26.1 | Total income from credit card holders/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x467 | N/A |
| 26.2 | Total income from credit card holders/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CS:x2 | N/A | boi_MC:x467 | boi_MU:x1 |
| 27.1 | Total income from credit card transactions/Number of transactions | boi_met:ri126 | xbrli:decimalItemType | instant | boi_BC:x11 | boi_CS:x2 | N/A | boi_MC:x281 | N/A |
| 27.2 | Total income from credit card transactions/Income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CS:x2 | N/A | boi_MC:x281 | boi_MU:x1 |