Equity (Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	$ (398,987)	$ (551,152)	$ (446,920)		$ (557,173)
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax				$ (6,806)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	104,908	41,851
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(56,975)	(29,024)
Other comprehensive income (loss)	47,933	12,827
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	41,690	12,466	25,946		(2,116)
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax				879
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	17,713	13,539
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1,969)	164
Other comprehensive income (loss)	15,744	13,703
Accumulated Other Comprehensive Income [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	47,933	12,827
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	(503,173)	(520,372)	(557,072)		(531,922)
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax				0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	34,349	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	19,550	11,550
Other comprehensive income (loss)	53,899	11,550
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	62,496	(43,246)	84,206		(23,135)
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax				(7,685)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	52,846	28,312
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(74,556)	(40,738)
Other comprehensive income (loss)	(21,710)	(12,426)
Entergy Louisiana [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	14,029		4,562
Other comprehensive income (loss)	9,467	(969)
Entergy Louisiana [Member] | Accumulated Other Comprehensive Income [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	9,467	(969)
Entergy Louisiana [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	14,029	(7,122)	$ 4,562		$ (6,153)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	10,050	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(583)	(969)
Other comprehensive income (loss)	$ 9,467	$ (969)
Restatement Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss				(563,979)
Restatement Adjustment [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss				(1,237)
Restatement Adjustment [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss				(531,922)
Restatement Adjustment [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss				$ (30,820)