Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
OPERATING ACTIVITIES
Consolidated net income	$ 339,145	$ 123,294
Adjustments to reconcile consolidated net income to net cash flow provided by (used in) operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	580,571	568,596
Deferred income taxes, investment tax credits, and non-current taxes accrued	240,431	(31,405)
Impairment of Long-Lived Assets Held-for-use	3,278	4,962
Changes in working capital:
Receivables	(52,690)	70,357
Fuel inventory	26,878	(15,389)
Accounts payable	(175,651)	(127,727)
Taxes accrued	(231,182)	(44,241)
Interest accrued	(3,778)	(4,791)
Deferred fuel costs	(353,099)	30,560
Other working capital accounts	(43,582)	(21,758)
Changes in provisions for estimated losses	(60,923)	(35,829)
Changes in other regulatory assets	89,910	99,275
Increase (Decrease) in Regulatory Liabilities	(14,464)	(450,905)
Changes in pension and other postretirement liabilities	(166,733)	(113,071)
Other Noncash Income (Expense)	(227,676)	607,132
Net cash flow provided by (used in) operating activities	(49,565)	659,060
INVESTING ACTIVITIES
Construction/capital expenditures	(1,552,103)	(1,043,608)
Allowance for equity funds used during construction	14,577	35,953
Payments to Acquire Buildings	0	(24,633)
Nuclear fuel purchases	(47,916)	(85,334)
Payments for Nuclear Fuel	(47,916)	(85,334)
Payments to storm reserve escrow account	(10)	(1,557)
Receipts from storm reserve escrow account	44,205	40,589
Decrease in other investments	12,521	2,265
Litigation proceeds for reimbursement of spent nuclear fuel storage costs	15,735	62,162
Proceeds from nuclear decommissioning trust fund sales	3,225,510	687,487
Investment in nuclear decommissioning trust funds	(3,224,487)	(718,741)
Changes in securitization account	(1,304)	(70)
Net cash flow used in investing activities	(1,513,272)	(1,045,487)
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	3,676,242	3,195,345
Proceeds from Sale of Treasury Stock	979	39,964
Retirement of long-term debt	(1,346,172)	(1,614,578)
Changes in credit borrowings and commercial paper - net	(599,860)	(4,911)
Dividends paid:
Common stock	(190,595)	(185,763)
Other	10,380	(756)
Net cash flow provided by financing activities	1,546,394	1,424,538
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(16,443)	1,038,111
Cash and cash equivalents at beginning of period	1,759,099	425,722
Cash and cash equivalents at end of period	1,742,656	1,463,833
Cash paid / (received) during the period for:
Interest - net of amount capitalized	202,451	203,466
Income taxes	9,015	(23,063)
Dividends Paid, Preferred Stock	(4,580)	(4,763)
Entergy Arkansas [Member]
OPERATING ACTIVITIES
Consolidated net income	93,037	44,595
Adjustments to reconcile consolidated net income to net cash flow provided by (used in) operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	126,630	123,160
Deferred income taxes, investment tax credits, and non-current taxes accrued	42,885	8,251
Changes in working capital:
Receivables	(56,256)	32,820
Fuel inventory	17,930	(9,419)
Accounts payable	(21,622)	(42,694)
Taxes accrued	8,365	9,302
Interest accrued	18,837	16,839
Deferred fuel costs	(55,704)	23,594
Other working capital accounts	(8,025)	(2,691)
Changes in provisions for estimated losses	(12,383)	4,695
Changes in other regulatory assets	42,388	(13,187)
Increase (Decrease) in Regulatory Liabilities	(38,604)	(161,989)
Changes in pension and other postretirement liabilities	(25,116)	11,704
Other Noncash Income (Expense)	(40,789)	164,694
Net cash flow provided by (used in) operating activities	91,573	209,674
INVESTING ACTIVITIES
Construction/capital expenditures	(146,334)	(179,117)
Allowance for equity funds used during construction	2,993	2,917
Nuclear fuel purchases	(17,621)	(52,211)
Payments for Nuclear Fuel	(17,621)	(52,211)
Proceeds from sale of nuclear fuel	16,059	17,210
Change in money pool receivable - net	(12,500)	(24,935)
Litigation proceeds for reimbursement of spent nuclear fuel storage costs	0	55,001
Proceeds from nuclear decommissioning trust fund sales	143,575	115,030
Investment in nuclear decommissioning trust funds	(148,783)	(121,003)
Changes in securitization account	0	(3,443)
Net cash flow used in investing activities	(162,611)	(190,551)
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	604,760	264,505
Retirement of long-term debt	(613,706)	(127,203)
Change in money pool payable - net	0	(21,634)
Dividends paid:
Other	11,636	(818)
Net cash flow provided by financing activities	2,690	114,850
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(68,348)	133,973
Cash and cash equivalents at beginning of period	192,128	3,519
Cash and cash equivalents at end of period	123,780	137,492
Cash paid / (received) during the period for:
Interest - net of amount capitalized	14,359	17,578
Entergy Louisiana [Member]
OPERATING ACTIVITIES
Consolidated net income	166,626	189,396
Adjustments to reconcile consolidated net income to net cash flow provided by (used in) operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	198,868	191,447
Deferred income taxes, investment tax credits, and non-current taxes accrued	67,823	(39,681)
Changes in working capital:
Receivables	(13,080)	23,004
Fuel inventory	1,194	(456)
Accounts payable	(126,070)	(86,317)
Taxes accrued	20,619	48,840
Interest accrued	(9,163)	(2,384)
Deferred fuel costs	(203,815)	(18,280)
Other working capital accounts	(25,628)	(3,156)
Changes in provisions for estimated losses	(258)	(41,113)
Changes in other regulatory assets	(70,784)	55,539
Increase (Decrease) in Regulatory Liabilities	22,503	(129,370)
Changes in pension and other postretirement liabilities	(30,745)	(22,806)
Other Noncash Income (Expense)	(52,688)	149,136
Net cash flow provided by (used in) operating activities	(54,598)	313,799
INVESTING ACTIVITIES
Construction/capital expenditures	(945,831)	(344,522)
Allowance for equity funds used during construction	6,101	14,887
Nuclear fuel purchases	(52,435)	(18,052)
Payments for Nuclear Fuel	(52,435)	(18,052)
Proceeds from sale of nuclear fuel	0	33,889
Change in money pool receivable - net	(62,346)	(84,466)
Payments to storm reserve escrow account	0	(1,113)
Receipts from storm reserve escrow account	0	40,589
Proceeds from nuclear decommissioning trust fund sales	291,275	144,962
Investment in nuclear decommissioning trust funds	(329,180)	(154,065)
Changes in securitization account	(6,050)	(5,348)
Net cash flow used in investing activities	(1,098,466)	(373,239)
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	1,399,245	1,221,900
Retirement of long-term debt	(368,707)	(603,607)
Change in money pool payable - net	0	(82,826)
Dividends paid:
Common stock	0	(11,500)
Other	(3,678)	(1,139)
Net cash flow provided by financing activities	1,026,860	522,828
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(126,204)	463,388
Cash and cash equivalents at beginning of period	728,020	2,006
Cash and cash equivalents at end of period	601,816	465,394
Cash paid / (received) during the period for:
Interest - net of amount capitalized	89,432	79,794
Income taxes	0	(20,684)
Entergy Mississippi [Member]
OPERATING ACTIVITIES
Consolidated net income	25,972	22,526
Adjustments to reconcile consolidated net income to net cash flow provided by (used in) operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	55,036	51,155
Deferred income taxes, investment tax credits, and non-current taxes accrued	22,593	2,762
Changes in working capital:
Receivables	4,557	17,971
Fuel inventory	1,736	(3,266)
Accounts payable	26,391	(8,125)
Taxes accrued	(75,886)	(58,651)
Interest accrued	4,238	6,201
Deferred fuel costs	(25,722)	13,406
Other working capital accounts	(3,425)	7,849
Changes in provisions for estimated losses	(7,689)	(47)
Changes in other regulatory assets	11,015	(8,484)
Increase (Decrease) in Regulatory Liabilities	19,147	(5,532)
Changes in pension and other postretirement liabilities	(5,668)	(2,482)
Other Noncash Income (Expense)	2,016	(2,022)
Net cash flow provided by (used in) operating activities	54,311	33,261
INVESTING ACTIVITIES
Construction/capital expenditures	(154,788)	(124,986)
Allowance for equity funds used during construction	1,668	1,439
Payments to Acquire Buildings	0	(24,633)
Change in money pool receivable - net	(9,683)	44,693
Decrease in other investments	1	(128)
Net cash flow used in investing activities	(162,802)	(103,615)
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	200,573	0
Change in money pool payable - net	(16,516)	19,006
Dividends paid:
Common stock	0	(2,500)
Other	1,132	2,266
Net cash flow provided by financing activities	185,189	18,772
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	76,698	(51,582)
Cash and cash equivalents at beginning of period	18	51,601
Cash and cash equivalents at end of period	76,716	19
Cash paid / (received) during the period for:
Interest - net of amount capitalized	12,757	9,800
Income taxes	(8,045)	0
Entergy New Orleans [Member]
OPERATING ACTIVITIES
Consolidated net income	1,771	11,186
Adjustments to reconcile consolidated net income to net cash flow provided by (used in) operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	18,161	15,075
Deferred income taxes, investment tax credits, and non-current taxes accrued	4,572	1,339
Changes in working capital:
Receivables	(1,975)	4,039
Fuel inventory	2,234	(25)
Accounts payable	(27,777)	(5,291)
Taxes accrued	13	122
Interest accrued	(3,203)	(929)
Deferred fuel costs	(4,886)	3,702
Other working capital accounts	(11,103)	(10,795)
Changes in provisions for estimated losses	(40,680)	923
Changes in other regulatory assets	28,879	1,867
Increase (Decrease) in Regulatory Liabilities	8,728	(9,599)
Changes in pension and other postretirement liabilities	(4,397)	(4,878)
Other Noncash Income (Expense)	15,549	10,582
Net cash flow provided by (used in) operating activities	(14,114)	17,318
INVESTING ACTIVITIES
Construction/capital expenditures	(26,165)	(60,001)
Allowance for equity funds used during construction	258	2,485
Change in money pool receivable - net	0	(7,979)
Payments to storm reserve escrow account	(3)	(314)
Receipts from storm reserve escrow account	44,200	0
Changes in securitization account	(3,415)	(2,882)
Net cash flow used in investing activities	14,875	(68,691)
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	0	139,116
Retirement of long-term debt	0	(20,000)
Change in money pool payable - net	15,039	0
Dividends paid:
Other	(214)	(445)
Net cash flow provided by financing activities	14,825	118,671
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	15,586	67,298
Cash and cash equivalents at beginning of period	26	6,017
Cash and cash equivalents at end of period	15,612	73,315
Cash paid / (received) during the period for:
Interest - net of amount capitalized	9,921	7,275
Entergy Texas [Member]
OPERATING ACTIVITIES
Consolidated net income	50,058	32,707
Adjustments to reconcile consolidated net income to net cash flow provided by (used in) operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	50,936	42,566
Deferred income taxes, investment tax credits, and non-current taxes accrued	(1,522)	3,921
Changes in working capital:
Receivables	(16,424)	1,221
Fuel inventory	3,509	(1,127)
Accounts payable	(42,511)	(35,288)
Taxes accrued	(5,123)	(20,597)
Interest accrued	(10,989)	(7,380)
Deferred fuel costs	(62,970)	8,138
Other working capital accounts	1,118	5,004
Changes in provisions for estimated losses	(31)	5
Changes in other regulatory assets	40,484	34,309
Increase (Decrease) in Regulatory Liabilities	(13,649)	(8,854)
Changes in pension and other postretirement liabilities	(5,434)	(9,086)
Other Noncash Income (Expense)	(16,316)	(8,425)
Net cash flow provided by (used in) operating activities	(28,864)	37,114
INVESTING ACTIVITIES
Construction/capital expenditures	(238,903)	(236,984)
Allowance for equity funds used during construction	2,445	10,641
Change in money pool receivable - net	4,601	(17,911)
Changes in securitization account	8,161	11,604
Net cash flow used in investing activities	(223,696)	(232,650)
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	0	194,631
Retirement of long-term debt	(27,951)	(26,864)
Change in money pool payable - net	30,858	0
Dividends paid:
Other	1,552	206
Net cash flow provided by financing activities	3,989	342,320
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(248,571)	146,784
Cash and cash equivalents at beginning of period	248,596	12,929
Cash and cash equivalents at end of period	25	159,713
Cash paid / (received) during the period for:
Interest - net of amount capitalized	33,394	29,699
Income taxes	(836)	(2,358)
Proceeds from Contributions from Parent	0	175,000
Dividends Paid, Preferred Stock	(470)	(653)
System Energy [Member]
OPERATING ACTIVITIES
Consolidated net income	23,864	28,513
Adjustments to reconcile consolidated net income to net cash flow provided by (used in) operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	53,433	47,041
Deferred income taxes, investment tax credits, and non-current taxes accrued	(10,197)	(5,764)
Changes in working capital:
Receivables	9,255	22,292
Accounts payable	(21,296)	15,049
Taxes accrued	(33,364)	(3,590)
Interest accrued	(1,088)	(201)
Other working capital accounts	2,347	(30,385)
Changes in other regulatory assets	20,923	(3,893)
Increase (Decrease) in Regulatory Liabilities	(12,591)	(135,561)
Changes in pension and other postretirement liabilities	(7,424)	(2,587)
Other Noncash Income (Expense)	(53,104)	129,528
Net cash flow provided by (used in) operating activities	(29,242)	60,442
INVESTING ACTIVITIES
Construction/capital expenditures	(14,890)	(60,551)
Allowance for equity funds used during construction	1,111	3,584
Nuclear fuel purchases	(4,745)	(69,022)
Payments for Nuclear Fuel	(4,745)	(69,022)
Proceeds from sale of nuclear fuel	12,626	9,503
Change in money pool receivable - net	(12,678)	42,479
Proceeds from nuclear decommissioning trust fund sales	211,481	132,661
Investment in nuclear decommissioning trust funds	(216,342)	(138,186)
Net cash flow used in investing activities	(23,437)	(79,532)
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	189,244	243,559
Retirement of long-term debt	(225,807)	(186,904)
Dividends paid:
Common stock	(21,000)	(13,653)
Net cash flow provided by financing activities	(57,563)	43,002
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(110,242)	23,912
Cash and cash equivalents at beginning of period	242,469	68,534
Cash and cash equivalents at end of period	132,227	92,446
Cash paid / (received) during the period for:
Interest - net of amount capitalized	10,720	8,598
Income taxes	$ 39,085	$ 0