| Zweckgebundener Fonds (privat) [Mitglied] | de | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Designated fund (private) [member] | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Fond d'affectation (privé) [membre] | fr | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Bestemmingsfonds (privaat) [member] | nl | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Zweckgebundener Fonds (privat) | de | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Designated fund (private) | en | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Fond d'affectation (privé) | fr | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Bestemmingsfonds (privaat) | nl | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |