Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES
Consolidated net income	$ 1,258,244	$ 862,555	$ 425,353
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	2,182,313	2,040,555	2,078,578
Deferred income taxes, investment tax credits, and non-current taxes accrued	193,950	(256,848)	529,053
Asset Write-Offs, Impairments, And Related Charges	226,678	491,739	357,251
Changes in working capital:
Receivables	(101,227)	98,546	(97,637)
Fuel inventory	(28,173)	45,839	(3,043)
Accounts payable	(71,898)	97,312	101,802
Taxes accrued	(20,784)	39,272	33,853
Interest accrued	937	5,220	742
Deferred fuel costs	172,146	(25,829)	56,290
Other working capital accounts	(3,108)	(164,173)	(4,331)
Changes in provisions for estimated losses	19,914	35,706	(3,279)
Increase (Decrease) in Other Regulatory Assets	545,559	(189,193)	(595,504)
Increase (Decrease) in Regulatory Liabilities	(14,781)	(803,323)	2,915,795
Deferred tax rate change recognized as regulatory liability/asset	0	0	(3,665,498)
Changes in pensions and other postretirement liabilities	187,124	(304,941)	(130,686)
Other	639,149	(34,424)	566,247
Net cash flow provided by operating activities	2,816,627	2,385,247	2,623,500
INVESTING ACTIVITIES
Construction/capital expenditures	(4,197,667)	(3,942,010)	(3,607,532)
Allowance for equity funds used during construction	144,862	130,195	96,000
Nuclear fuel purchases	(128,366)	(302,584)	(377,324)
Payment for purchase of plant or assets	(305,472)	(26,623)	(16,762)
Proceeds from sale of assets	28,932	24,902	100,000
Payments To Storm Reserve Escrow Account	(8,038)	(6,551)	(2,878)
Receipts from storm reserve escrow account	0	0	11,323
Changes in securitization account	3,298	(5,844)	1,323
Decrease (increase) in other investments	30,319	(54,500)	1,078
Litigation proceeds for reimbursement of spent nuclear fuel storage costs	2,369	59,643	25,493
Proceeds from nuclear decommissioning trust fund sales	4,121,351	6,484,791	3,162,747
Investment in nuclear decommissioning trust funds	(4,208,870)	(6,485,676)	(3,260,674)
Proceeds from insurance	7,040	18,270	26,157
Net cash flow used in investing activities	(4,510,242)	(4,105,987)	(3,841,049)
Proceeds from the issuance of:
Long-term debt	9,304,396	8,035,536	1,809,390
Preferred stock of subsidiary	33,188	73,330	14,399
Common stock and treasury stock	93,862	103,315	80,729
Proceeds from Issuance of Common Stock	607,650	499,272	0
Retirement of long-term debt	(7,619,380)	(6,965,738)	(1,585,681)
Payments for Repurchase of Preferred Stock and Preference Stock	(50,000)	(53,868)	(20,599)
Changes in credit borrowings and commercial paper - net	(4,389)	(364,031)	(1,163,296)
Dividends paid:
Common stock	(711,573)	(647,704)	(628,885)
Preferred stock	(16,438)	(14,185)	(13,940)
Other	(7,732)	26,453	(7,731)
Net cash flow provided by financing activities	1,638,362	1,420,442	810,978
Net increase (decrease) in cash and cash equivalents	(55,253)	(300,298)	(406,571)
Cash and cash equivalents at beginning of period	480,975	781,273	1,187,844
Cash and cash equivalents at end of period	425,722	480,975	781,273
Cash paid (received) during the period for:
Interest - net of amount capitalized	778,209	734,845	678,371
Income taxes	(40,435)	19,825	(13,375)
Entergy Arkansas [Member]
OPERATING ACTIVITIES
Consolidated net income	262,964	252,707	139,844
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	465,299	443,698	427,394
Deferred income taxes, investment tax credits, and non-current taxes accrued	94,368	129,524	67,711
Changes in working capital:
Receivables	(58,077)	4,294	(23,397)
Fuel inventory	(10,597)	6,210	3,402
Accounts payable	3,059	(126,405)	16,011
Taxes accrued	24,942	9,568	40,127
Interest accrued	3,895	678	1,635
Deferred fuel costs	72,560	43,869	33,190
Other working capital accounts	18,783	(30,118)	15,087
Changes in provisions for estimated losses	14,901	14,250	16,047
Increase (Decrease) in Other Regulatory Assets	131,873	(32,460)	76,762
Increase (Decrease) in Regulatory Liabilities	39,293	(341,682)	1,043,507
Deferred tax rate change recognized as regulatory liability/asset	0	0	(1,047,837)
Changes in pensions and other postretirement liabilities	5,831	(40,157)	(70,826)
Other	127,582	187,071	29,577
Net cash flow provided by operating activities	677,766	211,825	555,556
INVESTING ACTIVITIES
Construction/capital expenditures	(641,525)	(660,044)	(735,816)
Allowance for equity funds used during construction	15,306	17,013	19,211
Nuclear fuel purchases	(54,344)	(99,417)	(151,424)
Proceeds from sale of nuclear fuel	22,782	54,810	51,029
Decrease (increase) in other investments	630	(1,517)	392
Proceeds from nuclear decommissioning trust fund sales	317,377	300,801	339,434
Investment in nuclear decommissioning trust funds	(336,519)	(315,163)	(352,138)
Proceeds from insurance	0	14,790	0
Net cash flow used in investing activities	(676,293)	(688,727)	(829,312)
Proceeds from the issuance of:
Long-term debt	834,038	958,434	294,656
Retirement of long-term debt	(548,952)	(690,488)	(175,560)
Proceeds from Contributions from Parent	0	350,000	0
Payments for Repurchase of Preferred Stock and Preference Stock	0	(32,660)	0
Change in money pool payable - net	(161,104)	16,601	114,905
Changes in credit borrowings and commercial paper - net	0	49,974	(49,974)
Dividends paid:
Common stock	(115,000)	(91,751)	(15,000)
Preferred stock	0	(1,606)	(1,428)
Other	(7,055)	12,249	(8,084)
Net cash flow provided by financing activities	1,927	470,805	259,463
Net increase (decrease) in cash and cash equivalents	3,400	(6,097)	(14,293)
Cash and cash equivalents at beginning of period	119	6,216	20,509
Cash and cash equivalents at end of period	3,519	119	6,216
Cash paid (received) during the period for:
Interest - net of amount capitalized	131,134	118,731	115,162
Income taxes	(33,989)	44,393	(8,141)
Noncash Capital Contribution from Parent		(94,335)
Entergy Louisiana [Member]
OPERATING ACTIVITIES
Consolidated net income	691,537	675,614	316,347
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	685,062	662,390	621,018
Deferred income taxes, investment tax credits, and non-current taxes accrued	196,533	174,063	575,804
Changes in working capital:
Receivables	13,942	89,701	(53,829)
Fuel inventory	(7,195)	5,310	11,010
Accounts payable	(33,375)	11,372	58,880
Taxes accrued	(38,827)	12,711	128,261
Interest accrued	4,294	7,922	(70)
Deferred fuel costs	24,234	(40,036)	23,236
Other working capital accounts	(62,536)	(5,809)	(30,911)
Changes in provisions for estimated losses	9,664	8,307	(8,324)
Increase (Decrease) in Other Regulatory Assets	210,134	(40,765)	(492,696)
Increase (Decrease) in Regulatory Liabilities	(35,881)	(125,185)	605,453
Deferred tax rate change recognized as regulatory liability/asset	0	0	(1,207,808)
Changes in pensions and other postretirement liabilities	35,162	(106,269)	(32,309)
Other	36,478	15,652	161,909
Net cash flow provided by operating activities	1,236,002	1,395,204	1,337,545
INVESTING ACTIVITIES
Construction/capital expenditures	(1,673,194)	(1,805,641)	(1,662,835)
Allowance for equity funds used during construction	74,023	79,922	51,485
Nuclear fuel purchases	(85,984)	(111,329)	(197,829)
Proceeds from sale of nuclear fuel	11,596	53,603	42,634
Payments for (Proceeds from) Productive Assets	0	(26,623)	(9,805)
Proceeds from sale of assets	0	11,987	0
Payments To Storm Reserve Escrow Account	(6,353)	(4,770)	(2,110)
Receipts from storm reserve escrow account	0	4	8,835
Changes in securitization account	(32)	(1,655)	880
Payment For Proceed From Other Investing Activities	2,369	0	0
Proceeds from nuclear decommissioning trust fund sales	412,559	1,055,690	231,293
Investment in nuclear decommissioning trust funds	(442,501)	(1,097,204)	(266,592)
Change in money pool receivable - net	46,843	(35,672)	11,330
Proceeds from insurance	7,040	3,480	5,305
Net cash flow used in investing activities	(1,653,634)	(1,878,208)	(1,787,409)
Proceeds from the issuance of:
Long-term debt	2,691,133	2,319,799	733,344
Retirement of long-term debt	(2,199,053)	(1,664,354)	(407,736)
Change in money pool payable - net	82,826	0	0
Changes in credit borrowings and commercial paper - net	0	43,540	(39,746)
Dividends paid:
Common stock	(208,000)	(128,000)	(91,250)
Other	9,368	6,556	(2,183)
Net cash flow provided by financing activities	376,274	490,461	271,921
Net increase (decrease) in cash and cash equivalents	(41,358)	7,457	(177,943)
Cash and cash equivalents at beginning of period	43,364	35,907	213,850
Cash and cash equivalents at end of period	2,006	43,364	35,907
Cash paid (received) during the period for:
Interest - net of amount capitalized	296,842	272,335	266,871
Income taxes	15,272	(105,157)	(234,199)
Entergy Mississippi [Member]
OPERATING ACTIVITIES
Consolidated net income	119,925	126,078	110,032
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	170,886	152,577	143,479
Deferred income taxes, investment tax credits, and non-current taxes accrued	32,547	56,502	84,816
Changes in working capital:
Receivables	(17,245)	37,762	(29,528)
Fuel inventory	(3,208)	33,675	5,266
Accounts payable	(226)	(7,472)	3,595
Taxes accrued	13,109	(5,291)	18,803
Interest accrued	(1,331)	(2,670)	1,248
Deferred fuel costs	78,418	24,428	(25,487)
Other working capital accounts	(5,557)	(9,902)	5,115
Changes in provisions for estimated losses	(1,121)	6,378	(9,676)
Increase (Decrease) in Other Regulatory Assets	34,923	(54,860)	17,412
Increase (Decrease) in Regulatory Liabilities	(21,524)	(131,856)	405,395
Deferred tax rate change recognized as regulatory liability/asset	0	0	(452,429)
Changes in pensions and other postretirement liabilities	6,534	(8,405)	(8,055)
Other	(3,668)	(91,718)	8,577
Net cash flow provided by operating activities	339,952	418,382	226,585
INVESTING ACTIVITIES
Construction/capital expenditures	(432,600)	(387,293)	(427,616)
Allowance for equity funds used during construction	8,356	8,710	9,667
Payments for (Proceeds from) Productive Assets	(305,472)	0	(6,958)
Decrease (increase) in other investments	(655)	(1,123)	(1,281)
Change in money pool receivable - net	(3,313)	(39,747)	8,962
Net cash flow used in investing activities	(733,684)	(419,453)	(417,226)
Proceeds from the issuance of:
Long-term debt	437,153	54,449	148,185
Retirement of long-term debt	(150,000)	0	0
Proceeds from Contributions from Parent	130,000	0	0
Payments for Repurchase of Preferred Stock and Preference Stock	0	(21,208)	0
Dividends paid:
Common stock	0	(10,000)	(26,000)
Preferred stock	0	(993)	(953)
Other	(8,774)	9,681	(1,329)
Net cash flow provided by financing activities	408,379	31,929	119,903
Net increase (decrease) in cash and cash equivalents	14,647	30,858	(70,738)
Cash and cash equivalents at beginning of period	36,954	6,096	76,834
Cash and cash equivalents at end of period	51,601	36,954	6,096
Cash paid (received) during the period for:
Interest - net of amount capitalized	60,533	56,037	47,631
Income taxes	(12,204)	(19,118)	(25,043)
Entergy New Orleans [Member]
OPERATING ACTIVITIES
Consolidated net income	52,629	53,152	44,553
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	56,072	55,930	52,945
Deferred income taxes, investment tax credits, and non-current taxes accrued	21,350	24,548	64,036
Changes in working capital:
Receivables	(9,372)	15,724	(18,058)
Fuel inventory	(387)	357	(49)
Accounts payable	(5,571)	(385)	1,874
Taxes accrued	234	30,547	(22,100)
Interest accrued	550	879	44
Deferred fuel costs	3,630	(6,486)	12,592
Other working capital accounts	5,021	4,146	(2,711)
Changes in provisions for estimated losses	1,948	1,511	(3,430)
Increase (Decrease) in Other Regulatory Assets	29,567	(21,637)	(16,673)
Increase (Decrease) in Regulatory Liabilities	(22,105)	(28,459)	110,147
Deferred tax rate change recognized as regulatory liability/asset	0	0	(111,170)
Changes in pensions and other postretirement liabilities	(14,624)	(15,134)	(15,994)
Other	(55,796)	(13,811)	1,555
Net cash flow provided by operating activities	115,604	171,778	127,797
INVESTING ACTIVITIES
Construction/capital expenditures	(229,560)	(202,186)	(115,584)
Allowance for equity funds used during construction	9,941	5,941	2,418
Payments To Storm Reserve Escrow Account	(1,752)	(1,311)	(597)
Receipts from storm reserve escrow account	0	3	2,488
Changes in securitization account	236	(770)	283
Change in money pool receivable - net	16,825	(9,293)	1,492
Net cash flow used in investing activities	(204,310)	(207,616)	(109,500)
Proceeds from the issuance of:
Long-term debt	113,876	59,234	0
Retirement of long-term debt	(35,376)	(11,042)	(10,600)
Repayment of long-term payable due to Entergy Louisiana	(1,979)	(2,077)	(2,104)
Proceeds from Contributions from Parent	0	0	20,000
Payments for Repurchase of Preferred Stock and Preference Stock	0	0	(20,599)
Dividends paid:
Common stock	0	(23,750)	(74,250)
Preferred stock	0	0	(1,083)
Other	(1,475)	409	12
Net cash flow provided by financing activities	75,046	22,774	(88,624)
Net increase (decrease) in cash and cash equivalents	(13,660)	(13,064)	(70,327)
Cash and cash equivalents at beginning of period	19,677	32,741	103,068
Cash and cash equivalents at end of period	6,017	19,677	32,741
Cash paid (received) during the period for:
Interest - net of amount capitalized	22,873	19,840	20,180
Income taxes	(5,310)	(39,781)	(8,660)
Entergy Texas [Member]
OPERATING ACTIVITIES
Consolidated net income	159,397	162,235	76,173
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	153,286	128,534	117,520
Deferred income taxes, investment tax credits, and non-current taxes accrued	20,143	(39,545)	42,119
Changes in working capital:
Receivables	58,445	(17,099)	(15,934)
Fuel inventory	(4,926)	64	(25,054)
Accounts payable	(33,646)	43,319	32,842
Taxes accrued	(3,805)	7,854	30,308
Interest accrued	(5,363)	(1,201)	(421)
Deferred fuel costs	(6,696)	(47,604)	12,758
Other working capital accounts	(13,822)	1,328	(7,852)
Changes in provisions for estimated losses	(5,748)	3,741	2,531
Increase (Decrease) in Other Regulatory Assets	(85,400)	(63,350)	(184,574)
Increase (Decrease) in Regulatory Liabilities	(105,517)	(19,336)	410,968
Deferred tax rate change recognized as regulatory liability/asset	0	0	(520,547)
Changes in pensions and other postretirement liabilities	(7,152)	(13,135)	(49,445)
Other	3,257	(59,248)	(10,856)
Net cash flow provided by operating activities	286,739	331,753	301,396
INVESTING ACTIVITIES
Construction/capital expenditures	(898,090)	(451,988)	(348,027)
Allowance for equity funds used during construction	28,526	9,861	6,874
Proceeds from sale of assets	0	3,753	0
Changes in securitization account	2,465	(2,502)	(232)
Change in money pool receivable - net	(11,181)	44,903	(44,222)
Proceeds from insurance	0	0	2,431
Net cash flow used in investing activities	(878,280)	(395,973)	(383,176)
Proceeds from the issuance of:
Long-term debt	986,019	0	148,277
Retirement of long-term debt	(578,593)	(74,950)	(71,683)
Proceeds from Contributions from Parent	185,000	0	115,000
Proceeds from Issuance of Preferred Stock and Preference Stock	33,188	0	0
Change in money pool payable - net	(22,389)	22,389	0
Dividends paid:
Other	1,189	1,324	(482)
Net cash flow provided by financing activities	604,414	(51,237)	191,112
Net increase (decrease) in cash and cash equivalents	12,873	(115,457)	109,332
Cash and cash equivalents at beginning of period	56	115,513	6,181
Cash and cash equivalents at end of period	12,929	56	115,513
Cash paid (received) during the period for:
Interest - net of amount capitalized	89,402	85,719	84,556
Income taxes	17,010	20,787	(21,107)
System Energy [Member]
OPERATING ACTIVITIES
Consolidated net income	99,120	94,109	78,596
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	212,170	186,719	240,962
Deferred income taxes, investment tax credits, and non-current taxes accrued	95	24,040	7,827
Changes in working capital:
Receivables	(23,382)	18,169	9,210
Accounts payable	18,204	(7,067)	15,969
Taxes accrued	19,247	(51,999)	62,466
Interest accrued	(1,302)	(94)	(660)
Other working capital accounts	15,879	(45,415)	12,083
Increase (Decrease) in Other Regulatory Assets	43,712	2,044	(60,012)
Increase (Decrease) in Regulatory Liabilities	130,949	(156,802)	331,251
Deferred tax rate change recognized as regulatory liability/asset	0	0	(325,707)
Changes in pensions and other postretirement liabilities	11,177	(23,235)	4,024
Other	138,304	(64,947)	124,755
Net cash flow provided by operating activities	300,141	101,328	371,278
INVESTING ACTIVITIES
Construction/capital expenditures	(166,695)	(194,696)	(91,705)
Allowance for equity funds used during construction	8,709	8,750	6,345
Nuclear fuel purchases	(18,170)	(125,272)	(49,728)
Proceeds from sale of nuclear fuel	26,223	30,634	69,516
Proceeds from nuclear decommissioning trust fund sales	500,384	573,561	565,416
Investment in nuclear decommissioning trust funds	(517,828)	(583,683)	(596,236)
Change in money pool receivable - net	47,824	4,545	(77,858)
Net cash flow used in investing activities	(119,553)	(286,161)	(174,250)
Proceeds from the issuance of:
Long-term debt	1,103,917	741,785	150,100
Retirement of long-term debt	(1,187,406)	(662,904)	(150,103)
Changes in credit borrowings and commercial paper - net	0	17,830	49,063
Dividends paid:
Common stock	(124,250)	(67,720)	(106,610)
Other	0	0	(28)
Net cash flow provided by financing activities	(207,739)	(6,669)	(155,704)
Net increase (decrease) in cash and cash equivalents	(27,151)	(191,502)	41,324
Cash and cash equivalents at beginning of period	95,685	287,187	245,863
Cash and cash equivalents at end of period	68,534	95,685	287,187
Cash paid (received) during the period for:
Interest - net of amount capitalized	21,052	17,183	26,251
Income taxes	$ 2,284	$ 53,956	$ (2,227)