Revenue Recognition Revenue Recognition (Narrative) (Details) - $ / MWh	1 Months Ended	6 Months Ended	192 Months Ended
May 31, 2018	Jun. 30, 2018	Dec. 31, 2022
System Energy [Member]
Percent Interest in Grand Gulf	11.50%	90.00%
Palisades [Member] \| Subsequent Event [Member]
Maximum escalated power purchase agreement price per megawatt hour			61.50

Maximum escalated power purchase agreement price per megawatt hour

No definition available.

Name:	etr_Maximumescalatedpowerpurchaseagreementpricepermegawatthour
Namespace Prefix:	etr_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration