| Increase (decrease) in net assets available for benefits | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Total increase (decrease) in net assets available for benefits | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| The increase (decrease) in net assets available for benefits. Net assets available for benefits are assets of a retirement benefit plan less liabilities other than the actuarial present value of promised retirement benefits. | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Incremento (disminución) de activos netos disponibles para beneficios | es | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Total incremento (disminución) de activos netos disponibles para beneficios | es | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |