| Liabilities other than actuarial present value of promised retirement benefits | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| The amount of liabilities other than the actuarial present value of promised retirement benefits in retirement benefit plans. [Refer: Actuarial present value of promised retirement benefits] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Pasivos distintos del valor actuarial presente de los beneficios prometidos por retiro | es | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |