| Investments in subsidiaries, joint ventures and associates | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Total investments in subsidiaries, joint ventures and associates | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Investeringen in dochterondernemingen, joint ventures en geassocieerde deelnemingen | nl | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Het bedrag aan investeringen in dochterondernemingen, joint ventures en geassocieerde deelnemingen in de enkelvoudige jaarrekening van een entiteit. [Zie: geassocieerde deelnemingen [member]; joint ventures [member]; dochterondernemingen [member]; investeringen in dochterondernemingen] | nl | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |