| 年金 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 年金、経常費用、保険業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| (うち年金) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |
| Annuity payments | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Annuity payments-OE-INS | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Annuity payments | en | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |