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Revenue (Narrative) (Details)	12 Months Ended
Revenue (Narrative) (Details)	Dec. 31, 2024
System Energy [Member]
Percent Interest in Grand Gulf	90.00%

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- Definition

Percent Interest in Grand Gulf

+ References

No definition available.

+ Details

Name:	etr_PercentInterestinGrandGulf
Namespace Prefix:	etr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	dei_LegalEntityAxis=etr_SystemEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: