| Decrease through balances reversed in current period, regulatory deferral account credit balances | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Decrease through balances reversed in current period, regulatory deferral account credit balances | en | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |
| The decrease in regulatory deferral account credit balances resulting from balances reversed in the current period. [Refer: Regulatory deferral account credit balances] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Daling door saldi teruggenomen in de verslagperiode, uitgestelde creditrekeningen in verband met prijsregulering | nl | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| De daling van uitgestelde creditrekeningen in verband met prijsregulering die voortvloeit uit saldi teruggenomen in de verslagperiode. [Zie: uitgestelde creditrekeningen in verband met prijsregulering] | nl | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Daling door saldi teruggenomen in de verslagperiode, uitgestelde creditrekeningen in verband met prijsregulering | nl | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |