| 原子力発電工事償却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 |
| 原子力発電工事償却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 reserve for preparation of depreciation of nuclear power construction | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Increase (decrease) in reserve for preparation of depreciation of nuclear power construction-OpeCF-ELE | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |