| Contributions to plan by plan participants, net defined benefit liability (asset) | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Contributions to plan by plan participants, net defined benefit liability (asset) | en | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |
| The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Aportaciones al plan por los participantes, pasivo (activo) por beneficios definidos netos | es | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Aportaciones al plan por los participantes, pasivo (activo) por beneficios definidos netos | es | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |