| 正味収入保険料 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 正味収入保険料、経常収益、保険業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| (うち正味収入保険料) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |
| Net premiums written | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Net premiums written-OI-INS | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Net premiums written | en | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |