| Langfristige schuldverschreibungen, Pfandbriefe und sonstige Darlehen | de | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Non-current debentures, mortgage bonds and other loans | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Non-courantes obligations non garanties, obligations hypothécaires et autres emprunts | fr | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Langlopende obligatieleningen, pandbrieven en andere leningen | nl | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Schuldverschreibungen, Pfandbriefe und sonstige Darlehen | de | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Debentures, mortgage bonds and other loans | en | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Obligations non garanties, obligations hypothécaires et autres emprunts | fr | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Obligatieleningen, pandbrieven en andere leningen | nl | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Sonstige Schuldverschreibungen und private Darlehen (langfristig) | de | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Non-current other debentures and private loans | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Autres obligations non garanties et emprunts privés (non courants) | fr | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Langlopende andere obligaties en onderhandse leningen | nl | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |