| 資産の部の社債に係る保証債務に関する注記 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 資産の部の社債に係る保証債務に関する注記 [テキストブロック] | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Notes regarding guarantee obligation for corporate bonds included in assets | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Notes regarding guarantee obligation for corporate bonds included in assets [text block] | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |