| 為替差益 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 為替差益、保険引受収益、経常収益、保険業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| (うち為替差益) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |
| Foreign exchange gains | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Foreign exchange gains-insurance-OI-INS | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Foreign exchange gains | en | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |