| Assets (liabilities) of benefit plan | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Net assets available for benefits at beginning of period | en | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Net assets available for benefits at end of period | en | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |
| The amount of 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 |
| Activos (pasivos) de un plan de beneficios | es | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Activos netos disponibles para beneficios al inicio del periodo | es | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Activos netos disponibles para beneficios al final del periodo | es | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |