| 原子力発電工事償却準備引当金 | 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、特別法上の引当金、電気事業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Reserve for preparation of depreciation of nuclear power construction | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Reserve for preparation of depreciation of nuclear power construction-reserves under special laws-ELE | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |