| 営業雑収益 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 営業雑収益、ガス事業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 営業雑収益合計 | ja | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Miscellaneous operating revenue | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Miscellaneous operating revenue-GAS | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Total miscellaneous operating revenue | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |