| 原子力発電工事償却準備金取崩し(貸方) | 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取崩し(貸方)、電気事業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 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 |
| Reversal of reserve for preparation of depreciation of nuclear power construction-ELE | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |