| 未収原賠・廃炉等支援機構資金交付金 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 未収原賠・廃炉等支援機構資金交付金、投資その他の資産、電気事業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Grants-in-aid receivable from Nuclear Damage Liability and Nuclear Reactor Decommission Facilitation Fund | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Grants-in-aid receivable from Nuclear Damage Liability and Nuclear Reactor Decommission Facilitation Fund-IOA-ELE | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |