| De overige niet-gerealiseerde waardeveranderingen van beleggingen. | nl | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Sonstiges Neubewertungen von Kapitalanlagen | de | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Other revaluations of investments | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Autres réévaluations des placements | fr | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Overige herwaarderingen van beleggingen | nl | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Neubewertungen | de | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Revaluations | en | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Réévaluations | fr | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Herwaarderingen | nl | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |