| 使用済燃料再処理等準備引当金の増減額(△は減少) | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 使用済燃料再処理等準備引当金の増減額(△は減少)、営業活動によるキャッシュ・フロー、電気事業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Increase (decrease) in provision for preparation of reprocessing of spent nuclear fuel | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Increase (decrease) in provision for preparation of reprocessing of spent nuclear fuel - OpeCF - ELE | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |