| Provision of allowance for doubtful accounts | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Provision of allowance for doubtful accounts-OE-INS | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Provision of allowance for doubtful accounts | en | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |
| 貸倒引当金繰入額 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 貸倒引当金繰入額、経常費用、保険業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| (うち貸倒引当金繰入額) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ins/role/label | http://www.xbrl.org/2003/role/link |