| 収入積立保険料 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 収入積立保険料、経常収益、保険業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| (うち収入積立保険料) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |
| Premiums of saving-type insurance | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Premiums of saving-type insurance-OI-INS | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Premiums of saving-type insurance | en | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |