Transactions With Affiliates (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Entergy Arkansas [Member]
Intercompany revenues	$ 104,300,000	$ 127,800,000	$ 49,400,000
Intercompany operating expenses	471,900,000	510,200,000	467,400,000
Intercompany interest and investment income	400,000	0	0
Entergy Louisiana [Member]
Intercompany revenues	299,000,000	282,400,000	376,600,000
Intercompany operating expenses	627,800,000	619,500,000	670,800,000
Intercompany interest and investment income	128,200,000	128,000,000	127,700,000
Entergy Mississippi [Member]
Intercompany revenues	2,500,000	1,700,000	2,900,000
Intercompany operating expenses	266,800,000	310,500,000	256,500,000
Intercompany interest and investment income	0	0	100,000
Entergy New Orleans [Member]
Intercompany revenues	0	0	30,300,000
Intercompany operating expenses	256,400,000	286,100,000	276,700,000
Intercompany interest and investment income	0	200,000	0
Entergy Texas [Member]
Intercompany revenues	58,800,000	57,900,000	180,200,000
Intercompany operating expenses	240,200,000	234,600,000	343,700,000
Intercompany interest and investment income	200,000	0	0
System Energy [Member]
Intercompany revenues	456,700,000	633,500,000	548,300,000
Intercompany operating expenses	176,500,000	197,000,000	146,000,000
Intercompany interest and investment income	1,200,000	900,000	100,000
EWO Marketing, LLC [Member] | RS Cogen [Member]
Intercompany operating expenses	$ 24,000,000	$ 24,600,000	$ 24,700,000