| 使用済燃料再処理等既発電費支払契約締結分 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 使用済燃料再処理等既発電費支払契約締結分、電気事業営業費用、電気事業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Expenses incurred by contracts to bear back-end costs related to past years' power generation | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Expenses incurred by contracts to bear back-end costs related to past years' power generation - OE - electric - ELE | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |