| 使用済燃料再処理等積立金の増減額(△は増加) | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 使用済燃料再処理等積立金の増減額(△は増加)、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 |
| Decrease (increase) in reserve fund for reprocessing of spent nuclear fuel | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Decrease (increase) in reserve fund for reprocessing of spent nuclear fuel - OpeCF - ELE | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |