Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING ACTIVITIES
Consolidated net income	$ 1,406,653	$ 1,258,244	$ 862,555
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	2,257,750	2,182,313	2,040,555
Deferred income taxes, investment tax credits, and non-current taxes accrued	(131,114)	193,950	(256,848)
Asset Write-Offs, Impairments, And Related Charges	26,379	226,678	491,739
Changes in working capital:
Receivables	(139,296)	(101,227)	98,546
Fuel inventory	(27,458)	(28,173)	45,839
Accounts payable	137,457	(71,898)	97,312
Taxes accrued	207,556	(20,784)	39,272
Interest accrued	7,662	937	5,220
Deferred fuel costs	(49,484)	172,146	(25,829)
Other working capital accounts	(143,451)	(3,108)	(164,173)
Changes in provisions for estimated losses	(291,193)	19,914	35,706
Increase (Decrease) in Other Regulatory Assets	784,494	545,559	(189,193)
Increase (Decrease) in Regulatory Liabilities	238,669	(14,781)	(803,323)
Changes in pensions and other postretirement liabilities	50,379	187,124	(304,941)
Other	76,149	639,149	(34,424)
Net cash flow provided by operating activities	2,689,866	2,816,627	2,385,247
INVESTING ACTIVITIES
Construction/capital expenditures	(4,694,076)	(4,197,667)	(3,942,010)
Allowance for equity funds used during construction	119,430	144,862	130,195
Nuclear fuel purchases	(215,664)	(128,366)	(302,584)
Payment for purchase of plant or assets	(247,121)	(305,472)	(26,623)
Proceeds from sale of assets	0	28,932	24,902
Proceeds from insurance	0	7,040	18,270
Changes in securitization account	5,099	3,298	(5,844)
Payments To Storm Reserve Escrow Account	(2,273)	(8,038)	(6,551)
Receipts from storm reserve escrow account	297,588	0	0
Decrease (increase) in other investments	(12,755)	30,319	(54,500)
Litigation proceeds for reimbursement of spent nuclear fuel storage costs	72,711	2,369	59,643
Proceeds from nuclear decommissioning trust fund sales	3,107,812	4,121,351	6,484,791
Investment in nuclear decommissioning trust funds	(3,203,057)	(4,208,870)	(6,485,676)
Net cash flow used in investing activities	(4,772,306)	(4,510,242)	(4,105,987)
Proceeds from the issuance of:
Long-term debt	12,619,201	9,304,396	8,035,536
Preferred stock of subsidiary	0	33,188	73,330
Common stock and treasury stock	42,600	93,862	103,315
Proceeds from Issuance of Common Stock	0	607,650	499,272
Retirement of long-term debt	(8,152,378)	(7,619,380)	(6,965,738)
Payments for Repurchase of Preferred Stock and Preference Stock	0	(50,000)	(53,868)
Changes in credit borrowings and commercial paper - net	319,238	(4,389)	(364,031)
Other	(7,524)	(7,732)	26,453
Dividends paid:
Common stock	(748,342)	(711,573)	(647,704)
Preferred stock	(18,502)	(16,438)	(14,185)
Net cash flow provided by financing activities	3,415,817	1,638,362	1,420,442
Net increase (decrease) in cash and cash equivalents	1,333,377	(55,253)	(300,298)
Cash and cash equivalents at beginning of period	425,722	480,975	781,273
Cash and cash equivalents at end of period	1,759,099	425,722	480,975
Cash paid (received) during the period for:
Interest - net of amount capitalized	803,923	778,209	734,845
Income taxes	(31,228)	(40,435)	19,825
Entergy Arkansas [Member]
OPERATING ACTIVITIES
Consolidated net income	245,232	262,964	252,707
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	490,457	465,299	443,698
Deferred income taxes, investment tax credits, and non-current taxes accrued	87,019	94,368	129,524
Changes in working capital:
Receivables	(24,507)	(58,077)	4,294
Fuel inventory	(10,066)	(10,597)	6,210
Accounts payable	(22,773)	3,059	(126,405)
Taxes accrued	6	24,942	9,568
Interest accrued	(43)	3,895	678
Deferred fuel costs	(1,186)	72,560	43,869
Other working capital accounts	(11,061)	18,783	(30,118)
Changes in provisions for estimated losses	6,289	14,901	14,250
Increase (Decrease) in Other Regulatory Assets	165,534	131,873	(32,460)
Increase (Decrease) in Regulatory Liabilities	106,878	39,293	(341,682)
Changes in pensions and other postretirement liabilities	42,576	5,831	(40,157)
Other	83,469	127,582	187,071
Net cash flow provided by operating activities	659,818	677,766	211,825
INVESTING ACTIVITIES
Construction/capital expenditures	(775,595)	(641,525)	(660,044)
Allowance for equity funds used during construction	15,019	15,306	17,013
Nuclear fuel purchases	(100,678)	(54,344)	(99,417)
Payment for purchase of plant or assets	(5,988)	0	0
Proceeds from insurance	0	0	14,790
Decrease (increase) in other investments	4,036	630	(1,517)
Litigation proceeds for reimbursement of spent nuclear fuel storage costs	55,001	0	0
Proceeds from nuclear decommissioning trust fund sales	321,360	317,377	300,801
Investment in nuclear decommissioning trust funds	(336,392)	(336,519)	(315,163)
Net cash flow used in investing activities	(795,709)	(676,293)	(688,727)
Proceeds from the issuance of:
Long-term debt	1,071,121	834,038	958,434
Retirement of long-term debt	(632,175)	(548,952)	(690,488)
Payments for Repurchase of Preferred Stock and Preference Stock	0	0	(32,660)
Changes in credit borrowings and commercial paper - net	0	0	49,974
Other	2,188	(7,055)	12,249
Dividends paid:
Common stock	(95,000)	(115,000)	(91,751)
Preferred stock	0	0	(1,606)
Net cash flow provided by financing activities	324,500	1,927	470,805
Net increase (decrease) in cash and cash equivalents	188,609	3,400	(6,097)
Cash and cash equivalents at beginning of period	3,519	119	6,216
Cash and cash equivalents at end of period	192,128	3,519	119
Cash paid (received) during the period for:
Interest - net of amount capitalized	140,735	131,134	118,731
Income taxes	(21,971)	(33,989)	44,393
Proceeds from sale of nuclear fuel	30,638	22,782	54,810
Change in money pool receivable - net	(3,110)	0	0
Proceeds from Contributions from Parent	0	0	350,000
Change in money pool payable - net	(21,634)	(161,104)	16,601
Entergy Louisiana [Member]
OPERATING ACTIVITIES
Consolidated net income	1,082,352	691,537	675,614
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	783,616	685,062	662,390
Deferred income taxes, investment tax credits, and non-current taxes accrued	(356,256)	196,533	174,063
Changes in working capital:
Receivables	(79,451)	13,942	89,701
Fuel inventory	(9,067)	(7,195)	5,310
Accounts payable	160,659	(33,375)	11,372
Taxes accrued	50,576	(38,827)	12,711
Interest accrued	4,505	4,294	7,922
Deferred fuel costs	(57,895)	24,234	(40,036)
Other working capital accounts	(76,284)	(62,536)	(5,809)
Changes in provisions for estimated losses	(295,480)	9,664	8,307
Increase (Decrease) in Other Regulatory Assets	410,855	210,134	(40,765)
Increase (Decrease) in Regulatory Liabilities	71,698	(35,881)	(125,185)
Changes in pensions and other postretirement liabilities	12,199	35,162	(106,269)
Other	(192,669)	36,478	15,652
Net cash flow provided by operating activities	1,072,986	1,236,002	1,395,204
INVESTING ACTIVITIES
Construction/capital expenditures	(1,960,787)	(1,673,194)	(1,805,641)
Allowance for equity funds used during construction	38,151	74,023	79,922
Nuclear fuel purchases	(92,831)	(85,984)	(111,329)
Proceeds from sale of assets	0	0	11,987
Payments for (Proceeds from) Productive Assets	(236,999)	0	(26,623)
Proceeds from insurance	0	7,040	3,480
Payment For Proceed From Other Investing Activities	5,090	2,369	0
Changes in securitization account	951	(32)	(1,655)
Payments To Storm Reserve Escrow Account	(1,488)	(6,353)	(4,770)
Receipts from storm reserve escrow account	297,363	0	4
Proceeds from nuclear decommissioning trust fund sales	347,021	412,559	1,055,690
Investment in nuclear decommissioning trust funds	(372,227)	(442,501)	(1,097,204)
Net cash flow used in investing activities	(1,944,671)	(1,653,634)	(1,878,208)
Proceeds from the issuance of:
Long-term debt	3,675,083	2,691,133	2,319,799
Retirement of long-term debt	(1,962,635)	(2,199,053)	(1,664,354)
Changes in credit borrowings and commercial paper - net	0	0	43,540
Other	(10,423)	9,368	6,556
Dividends paid:
Common stock	(21,500)	(208,000)	(128,000)
Net cash flow provided by financing activities	1,597,699	376,274	490,461
Net increase (decrease) in cash and cash equivalents	726,014	(41,358)	7,457
Cash and cash equivalents at beginning of period	2,006	43,364	35,907
Cash and cash equivalents at end of period	728,020	2,006	43,364
Cash paid (received) during the period for:
Interest - net of amount capitalized	318,352	296,842	272,335
Income taxes	(14,714)	15,272	(105,157)
Proceeds from sale of nuclear fuel	44,511	11,596	53,603
Change in money pool receivable - net	13,426	(46,843)	35,672
Change in money pool payable - net	(82,826)	82,826	0
Entergy Mississippi [Member]
OPERATING ACTIVITIES
Consolidated net income	140,583	119,925	126,078
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	209,252	170,886	152,577
Deferred income taxes, investment tax credits, and non-current taxes accrued	36,827	32,547	56,502
Changes in working capital:
Receivables	(1,889)	(17,245)	37,762
Fuel inventory	(1,978)	(3,208)	33,675
Accounts payable	22,794	(226)	(7,472)
Taxes accrued	17,423	13,109	(5,291)
Interest accrued	1,989	(1,331)	(2,670)
Deferred fuel costs	(55,711)	78,418	24,428
Other working capital accounts	630	(5,557)	(9,902)
Changes in provisions for estimated losses	(3,517)	(1,121)	6,378
Increase (Decrease) in Other Regulatory Assets	89,369	34,923	(54,860)
Increase (Decrease) in Regulatory Liabilities	(18,672)	(21,524)	(131,856)
Changes in pensions and other postretirement liabilities	11,319	6,534	(8,405)
Other	(30,633)	(3,668)	(91,718)
Net cash flow provided by operating activities	300,314	339,952	418,382
INVESTING ACTIVITIES
Construction/capital expenditures	(555,287)	(432,600)	(387,293)
Allowance for equity funds used during construction	6,726	8,356	8,710
Payments for (Proceeds from) Productive Assets	(28,612)	(305,472)	0
Decrease (increase) in other investments	1,719	(655)	(1,123)
Net cash flow used in investing activities	(530,762)	(733,684)	(419,453)
Proceeds from the issuance of:
Long-term debt	165,385	437,153	54,449
Retirement of long-term debt	0	(150,000)	0
Payments for Repurchase of Preferred Stock and Preference Stock	0	0	(21,208)
Other	6,964	(8,774)	9,681
Dividends paid:
Common stock	(10,000)	0	(10,000)
Preferred stock	0	0	(993)
Net cash flow provided by financing activities	178,865	408,379	31,929
Net increase (decrease) in cash and cash equivalents	(51,583)	14,647	30,858
Cash and cash equivalents at beginning of period	51,601	36,954	6,096
Cash and cash equivalents at end of period	18	51,601	36,954
Cash paid (received) during the period for:
Interest - net of amount capitalized	64,536	60,533	56,037
Income taxes	(8,084)	(12,204)	(19,118)
Change in money pool receivable - net	(44,692)	3,313	39,747
Proceeds from Contributions from Parent	0	130,000	0
Change in money pool payable - net	(16,516)	0	0
Entergy New Orleans [Member]
OPERATING ACTIVITIES
Consolidated net income	49,338	52,629	53,152
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	64,012	56,072	55,930
Deferred income taxes, investment tax credits, and non-current taxes accrued	3,938	21,350	24,548
Changes in working capital:
Receivables	(12,003)	(9,372)	15,724
Fuel inventory	(58)	(387)	357
Accounts payable	5,582	(5,571)	(385)
Taxes accrued	398	234	30,547
Interest accrued	1,179	550	879
Deferred fuel costs	(7,048)	3,630	(6,486)
Other working capital accounts	(13,156)	5,021	4,146
Changes in provisions for estimated losses	1,356	1,948	1,511
Increase (Decrease) in Other Regulatory Assets	7,427	29,567	(21,637)
Increase (Decrease) in Regulatory Liabilities	(4,728)	(22,105)	(28,459)
Changes in pensions and other postretirement liabilities	(14,063)	(14,624)	(15,134)
Other	3,296	(55,796)	(13,811)
Net cash flow provided by operating activities	64,024	115,604	171,778
INVESTING ACTIVITIES
Construction/capital expenditures	(228,983)	(229,560)	(202,186)
Allowance for equity funds used during construction	6,339	9,941	5,941
Payments to Acquire Buildings	(1,584)	0	0
Changes in securitization account	(1,375)	236	(770)
Payments To Storm Reserve Escrow Account	(433)	(1,752)	(1,311)
Receipts from storm reserve escrow account	0	0	3
Net cash flow used in investing activities	(220,845)	(204,310)	(207,616)
Proceeds from the issuance of:
Long-term debt	138,925	113,876	59,234
Retirement of long-term debt	(56,593)	(35,376)	(11,042)
Other	146	(1,475)	409
Dividends paid:
Common stock	0	0	(23,750)
Net cash flow provided by financing activities	150,830	75,046	22,774
Net increase (decrease) in cash and cash equivalents	(5,991)	(13,660)	(13,064)
Cash and cash equivalents at beginning of period	6,017	19,677	32,741
Cash and cash equivalents at end of period	26	6,017	19,677
Cash paid (received) during the period for:
Interest - net of amount capitalized	26,673	22,873	19,840
Income taxes	3,392	(5,310)	(39,781)
Change in money pool receivable - net	(5,191)	(16,825)	9,293
Proceeds from Contributions from Parent	60,000	0	0
Change in money pool payable - net	10,190	0	0
Entergy Texas [Member]
OPERATING ACTIVITIES
Consolidated net income	215,073	159,397	162,235
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	177,738	153,286	128,534
Deferred income taxes, investment tax credits, and non-current taxes accrued	36,033	20,143	(39,545)
Changes in working capital:
Receivables	(30,082)	58,445	(17,099)
Fuel inventory	(5,938)	(4,926)	64
Accounts payable	(23,692)	(33,646)	43,319
Taxes accrued	2,730	(3,805)	7,854
Interest accrued	1,864	(5,363)	(1,201)
Deferred fuel costs	72,355	(6,696)	(47,604)
Other working capital accounts	(11,837)	(13,822)	1,328
Changes in provisions for estimated losses	274	(5,748)	3,741
Increase (Decrease) in Other Regulatory Assets	12,065	(85,400)	(63,350)
Increase (Decrease) in Regulatory Liabilities	(57,477)	(105,517)	(19,336)
Changes in pensions and other postretirement liabilities	(28,825)	(7,152)	(13,135)
Other	(39,174)	3,257	(59,248)
Net cash flow provided by operating activities	375,325	286,739	331,753
INVESTING ACTIVITIES
Construction/capital expenditures	(895,857)	(898,090)	(451,988)
Allowance for equity funds used during construction	44,073	28,526	9,861
Payments to Acquire Buildings	(4,931)	0	0
Proceeds from sale of assets	0	0	3,753
Changes in securitization account	1,487	2,465	(2,502)
Net cash flow used in investing activities	(848,648)	(878,280)	(395,973)
Proceeds from the issuance of:
Long-term debt	937,725	986,019	0
Retirement of long-term debt	(367,565)	(578,593)	(74,950)
Other	(4,106)	1,189	1,324
Dividends paid:
Common stock	(30,000)	0	0
Preferred stock	(2,064)	0	0
Net cash flow provided by financing activities	708,990	604,414	(51,237)
Net increase (decrease) in cash and cash equivalents	235,667	12,873	(115,457)
Cash and cash equivalents at beginning of period	12,929	56	115,513
Cash and cash equivalents at end of period	248,596	12,929	56
Cash paid (received) during the period for:
Interest - net of amount capitalized	89,077	89,402	85,719
Income taxes	2,792	17,010	20,787
Change in money pool receivable - net	(6,580)	11,181	(44,903)
Proceeds from Contributions from Parent	175,000	185,000	0
Proceeds from Issuance of Preferred Stock and Preference Stock	0	33,188	0
Change in money pool payable - net	0	(22,389)	22,389
System Energy [Member]
OPERATING ACTIVITIES
Consolidated net income	99,131	99,120	94,109
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	184,429	212,170	186,719
Deferred income taxes, investment tax credits, and non-current taxes accrued	(455,732)	95	24,040
Changes in working capital:
Receivables	13,932	(23,382)	18,169
Accounts payable	(11,587)	18,204	(7,067)
Taxes accrued	69,145	19,247	(51,999)
Interest accrued	729	(1,302)	(94)
Other working capital accounts	(34,158)	15,879	(45,415)
Increase (Decrease) in Other Regulatory Assets	48,880	43,712	2,044
Increase (Decrease) in Regulatory Liabilities	140,965	130,949	(156,802)
Changes in pensions and other postretirement liabilities	15,596	11,177	(23,235)
Other	119,032	138,304	(64,947)
Net cash flow provided by operating activities	(145,462)	300,141	101,328
INVESTING ACTIVITIES
Construction/capital expenditures	(193,857)	(166,695)	(194,696)
Allowance for equity funds used during construction	9,122	8,709	8,750
Nuclear fuel purchases	(94,991)	(18,170)	(125,272)
Litigation proceeds for reimbursement of spent nuclear fuel storage costs	5,459	0	0
Proceeds from nuclear decommissioning trust fund sales	418,943	500,384	573,561
Investment in nuclear decommissioning trust funds	(432,249)	(517,828)	(583,683)
Net cash flow used in investing activities	(206,443)	(119,553)	(286,161)
Proceeds from the issuance of:
Long-term debt	1,147,903	1,103,917	741,785
Retirement of long-term debt	(891,410)	(1,187,406)	(662,904)
Changes in credit borrowings and commercial paper - net	0	0	17,830
Dividends paid:
Common stock	(80,653)	(124,250)	(67,720)
Net cash flow provided by financing activities	525,840	(207,739)	(6,669)
Net increase (decrease) in cash and cash equivalents	173,935	(27,151)	(191,502)
Cash and cash equivalents at beginning of period	68,534	95,685	287,187
Cash and cash equivalents at end of period	242,469	68,534	95,685
Cash paid (received) during the period for:
Interest - net of amount capitalized	35,061	21,052	17,183
Income taxes	384,329	2,284	53,956
Proceeds from sale of nuclear fuel	25,836	26,223	30,634
Change in money pool receivable - net	(55,294)	(47,824)	(4,545)
Proceeds from Contributions from Parent	$ 350,000	$ 0	$ 0