| 積立保険料等運用益 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 積立保険料等運用益、経常収益、保険業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| (うち積立保険料等運用益) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |
| Investment income from saving type insurance | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Investment income from saving type insurance-OI-INS | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Investment income from saving type insurance | en | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |