| 附帯事業費用 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 附帯事業費用、ガス事業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 附帯事業費用合計 | ja | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Expenses for incidental businesses | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Expenses for incidental businesses-GAS | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Total expenses for incidental businesses | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |