Equity (Accumulated Other Comprehensive Income (Loss))(Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax				$ (632,617)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss		$ (561,498)	$ 10,960		$ (23,531)	$ (34,971)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		72,404	72,480
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		6,741	(26,549)
Other comprehensive income (loss)		79,145	45,931
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect	[1]	(16,538)
Tax Cuts and Jobs Act, Reclassification from AOCI resulting from stranded tax effects		15,505
Restatement Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss				(656,148)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss			748			748
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
Other comprehensive income (loss)			0
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax				(632,617)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss		(6,201)	467,561		545,045	429,734
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		838	39,872
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(33,694)	(2,045)
Other comprehensive income (loss)		(32,856)	37,827
Tax Cuts and Jobs Act, Reclassification from AOCI resulting from stranded tax effects		114,227
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Restatement Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss				(87,572)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss		(605,491)	(460,814)		(531,099)	(469,446)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		16,574	8,632
Other comprehensive income (loss)		16,574	8,632
Tax Cuts and Jobs Act, Reclassification from AOCI resulting from stranded tax effects		(90,966)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Restatement Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss				(531,099)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss		50,194	3,465		(37,477)	3,993
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		71,566	32,608
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		23,861	(33,136)
Other comprehensive income (loss)		95,427	(528)
Tax Cuts and Jobs Act, Reclassification from AOCI resulting from stranded tax effects		(7,756)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Restatement Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss				$ (37,477)
Entergy Louisiana [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss		(56,950)			(46,400)
Other comprehensive income (loss)		(501)	(370)
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect		(3,787)
Entergy Louisiana [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss		(56,950)	(48,812)		$ (46,400)	$ (48,442)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(501)	(370)
Other comprehensive income (loss)		(501)	(370)
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect		$ (10,049)	$ 0

[1] Text selection found with no content.