Rate And Regulatory Matters (Payments/Receipts Among The Utility Operating Companies) (Details) - USD ($) $ in Millions	1 Months Ended				3 Months Ended	12 Months Ended
	Jul. 31, 2018	May 31, 2018	May 31, 2014	Dec. 31, 2011	Dec. 31, 2007	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order					$ 278	$ 0	$ 0	$ 41	$ 77	$ 47	$ 390	$ 252
Entergy Arkansas [Member] | FERC October 2011 Order [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order				$ 156
Entergy Arkansas [Member] | FERC February 2014 Order [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order			$ 68
Entergy Arkansas [Member] | FERC May 2018 Order [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order	$ (4)
Entergy Arkansas [Member] | FERC May 2018 Bandwidth True-up Orders [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order		$ 3
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order						0	0
Receipts from utility operating companies pursuant to FERC order					(203)			(41)	(12)	(25)	(247)	(160)
Entergy Louisiana [Member] | FERC October 2011 Order [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order				(75)
Entergy Louisiana [Member] | FERC February 2014 Order [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order			(10)
Entergy Louisiana [Member] | FERC May 2018 Order [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order	(23)
Entergy Louisiana [Member] | FERC May 2018 Bandwidth True-up Orders [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order		3
Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order						0	0	0
Receipts from utility operating companies pursuant to FERC order					(34)				(40)	(21)	(24)	(20)
Entergy Mississippi [Member] | FERC October 2011 Order [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order				(33)
Entergy Mississippi [Member] | FERC February 2014 Order [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order			(11)
Entergy Mississippi [Member] | FERC May 2018 Order [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order	16
Entergy Mississippi [Member] | FERC May 2018 Bandwidth True-up Orders [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order		(1)
Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order					0			0			0
Receipts from utility operating companies pursuant to FERC order						(15)	(15)		(25)	(1)		(7)
Entergy New Orleans [Member] | FERC October 2011 Order [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order				(5)
Entergy New Orleans [Member] | FERC February 2014 Order [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order			2
Entergy New Orleans [Member] | FERC May 2018 Order [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order	5
Entergy New Orleans [Member] | FERC May 2018 Bandwidth True-up Orders [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order		1
Entergy Texas [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order						$ 15	$ 15	$ 0	$ 0	$ 0
Receipts from utility operating companies pursuant to FERC order					$ (41)						$ (119)	$ (65)
Entergy Texas [Member] | FERC October 2011 Order [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order				$ (43)
Entergy Texas [Member] | FERC February 2014 Order [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order			$ (49)
Entergy Texas [Member] | FERC May 2018 Order [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order	$ 6
Entergy Texas [Member] | FERC May 2018 Bandwidth True-up Orders [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order		$ (5)