| 使用済燃料再処理等既発電料受取契約締結分 | 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料受取契約締結分、電気事業営業収益、電気事業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Revenue from contracts to recover back-end costs related to past years' power generation | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Revenue from contracts to recover back-end costs related to past years' power generation - OR - electric - ELE | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |