| 再保険料 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 再保険料、経常費用、保険業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| (うち再保険料) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |
| Reinsurance premiums | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Reinsurance premiums-OE-INS | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Reinsurance premiums | en | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |