Rate And Regulatory Matters Rate and Regulatory Matters (Schedule of Opportunity Sales Proceeding) (Details) $ in Millions	1 Months Ended
Dec. 31, 2018 USD ($)
Entergy Arkansas [Member]
Payments for Legal Settlements	$ 135

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (g)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

Name:	us-gaap_PaymentsForLegalSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration