| 株式等償却 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 株式等償却、経常費用、銀行業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| (うち株式等償却) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/bnk/role/label | http://www.xbrl.org/2003/role/link |
| Losses on devaluation of stocks and other securities | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Losses on devaluation of stocks and other securities-OE-BNK | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Losses on devaluation of stocks and other securities | en | http://disclosure.edinet-fsa.go.jp/jppfs/bnk/role/label | http://www.xbrl.org/2003/role/link |