Equity (Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	$ (500,507)	$ (398,987)	$ (449,207)	$ (446,920)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(43,819)	104,908
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(7,481)	(56,975)
Other comprehensive income (loss)	(51,300)	47,933
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	11,963	41,690	56,650	25,946
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(45,301)	17,713
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	614	(1,969)
Other comprehensive income (loss)	(44,687)	15,744
Accumulated Other Comprehensive Income [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(51,300)	47,933
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	(511,609)	(503,173)	(534,576)	(557,072)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	34,349
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	22,967	19,550
Other comprehensive income (loss)	22,967	53,899
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	(861)	62,496	28,719	84,206
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1,482	52,846
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(31,062)	(74,556)
Other comprehensive income (loss)	(29,580)	(21,710)
Entergy Louisiana [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	3,920		4,327
Other comprehensive income (loss)	(407)	9,467
Entergy Louisiana [Member] | Accumulated Other Comprehensive Income [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(407)	9,467
Entergy Louisiana [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss	3,920	14,029	$ 4,327	$ 4,562
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	10,050
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(407)	(583)
Other comprehensive income (loss)	$ (407)	$ 9,467