| 新株予約権付社債利息 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 新株予約権付社債利息、経常費用、銀行業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| (うち新株予約権付社債利息) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/bnk/role/label | http://www.xbrl.org/2003/role/link |
| Interest on bonds with share acquisition rights | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Interest on bonds with share acquisition rights - OE - BNK | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Interest on bonds with share acquisition rights | en | http://disclosure.edinet-fsa.go.jp/jppfs/bnk/role/label | http://www.xbrl.org/2003/role/link |