| 原子力発電工事償却準備金引当又は取崩し | 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金引当又は取崩し、電気事業 [タイトル項目] | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Provision or reversal of reserve for preparation of depreciation of nuclear power construction | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Provision or reversal of reserve for preparation of depreciation of nuclear power construction-ELE [abstract] | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |