| Benefits paid or payable | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Benefits paid or payable | en | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |
| The amount of benefits paid or payable for retirement benefit plans. | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Beneficios pagados o exigibles | es | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Beneficios pagados o exigibles | es | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |