Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING ACTIVITIES
Consolidated net income	$ 123,294	$ 258,646
Adjustments to reconcile consolidated net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	568,596	530,224
Deferred income taxes, investment tax credits, and non-current taxes accrued	(31,405)	104,884
Impairment of Long-Lived Assets Held-for-use	4,962	25,462
Changes in working capital:
Receivables	70,357	39,697
Fuel inventory	(15,389)	(4,401)
Accounts payable	(127,727)	(63,613)
Taxes accrued	(44,241)	(44,083)
Interest accrued	(4,791)	(20,546)
Deferred fuel costs	30,560	20,201
Other working capital accounts	(21,758)	(42,016)
Changes in provisions for estimated losses	(35,829)	13,720
Changes in other regulatory assets	99,275	(162,192)
Increase (Decrease) in Regulatory Liabilities	(450,905)	130,924
Changes in pension and other postretirement liabilities	(113,071)	(7,713)
Other Noncash Income (Expense)	607,132	(278,005)
Net cash flow provided by operating activities	659,060	501,189
INVESTING ACTIVITIES
Construction/capital expenditures	(1,043,608)	(951,629)
Allowance for equity funds used during construction	35,953	38,322
Payments to Acquire Buildings	24,633	0
Nuclear fuel purchases	(85,334)	(38,445)
Payments for Nuclear Fuel	(85,334)	(38,445)
Payments to storm reserve escrow account	(1,557)	(2,285)
Receipts from storm reserve escrow account	40,589	0
Decrease in other investments	2,265	39,045
Litigation proceeds for reimbursement of spent nuclear fuel storage costs	62,162	0
Proceeds from nuclear decommissioning trust fund sales	687,487	1,307,547
Investment in nuclear decommissioning trust funds	(718,741)	(1,342,429)
Changes in securitization account	(70)	(1,084)
Net cash flow used in investing activities	(1,045,487)	(950,958)
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	3,195,345	3,444,230
Common stock and treasury stock	39,964	35,577
Retirement of long-term debt	(1,614,578)	(2,298,855)
Changes in credit borrowings and commercial paper - net	(4,911)	(17)
Payments for Repurchase of Preferred Stock and Preference Stock	0	50,000
Dividends paid:
Common stock	(185,763)	(172,591)
Preferred stock	(4,763)	(4,109)
Other	(756)	(1,945)
Net cash flow provided by financing activities	1,424,538	952,290
Net increase in cash and cash equivalents	1,038,111	502,521
Cash and cash equivalents at beginning of period	425,722	480,975
Cash paid / (received) during the period for:
Interest - net of amount capitalized	203,466	214,935
Income taxes	(23,063)	(13,844)
Entergy Arkansas [Member]
OPERATING ACTIVITIES
Consolidated net income	44,595	39,121
Adjustments to reconcile consolidated net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	123,160	117,255
Deferred income taxes, investment tax credits, and non-current taxes accrued	8,251	30,756
Changes in working capital:
Receivables	32,820	22,194
Fuel inventory	(9,419)	260
Accounts payable	(42,694)	(56,432)
Taxes accrued	9,302	(10,616)
Interest accrued	16,839	12,661
Deferred fuel costs	23,594	44,926
Other working capital accounts	(2,691)	1,599
Changes in provisions for estimated losses	4,695	9,930
Changes in other regulatory assets	(13,187)	(56,263)
Increase (Decrease) in Regulatory Liabilities	(161,989)	53,386
Changes in pension and other postretirement liabilities	11,704	(910)
Other Noncash Income (Expense)	164,694	(1,400)
Net cash flow provided by operating activities	209,674	206,467
INVESTING ACTIVITIES
Construction/capital expenditures	(179,117)	(147,214)
Allowance for equity funds used during construction	2,917	3,506
Change in money pool receivable - net	(24,935)	(30,521)
Nuclear fuel purchases	(52,211)	(214)
Payments for Nuclear Fuel	(52,211)	(214)
Proceeds from sale of nuclear fuel	17,210	22,834
Decrease in other investments	0	1
Litigation proceeds for reimbursement of spent nuclear fuel storage costs	55,001	0
Proceeds from nuclear decommissioning trust fund sales	115,030	34,423
Investment in nuclear decommissioning trust funds	(121,003)	(40,223)
Changes in securitization account	(3,443)	(3,553)
Net cash flow used in investing activities	(190,551)	(160,961)
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	264,505	603,655
Retirement of long-term debt	(127,203)	(275,904)
Change in money pool payable - net	(21,634)	(182,738)
Dividends paid:
Other	(818)	(397)
Net cash flow provided by financing activities	114,850	144,616
Net increase in cash and cash equivalents	133,973	190,122
Cash and cash equivalents at beginning of period	3,519	119
Cash paid / (received) during the period for:
Interest - net of amount capitalized	17,578	19,458
Entergy Louisiana [Member]
OPERATING ACTIVITIES
Consolidated net income	189,396	127,633
Adjustments to reconcile consolidated net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	191,447	153,368
Deferred income taxes, investment tax credits, and non-current taxes accrued	(39,681)	49,041
Changes in working capital:
Receivables	23,004	(849)
Fuel inventory	(456)	31
Accounts payable	(86,317)	(26,475)
Taxes accrued	48,840	16,311
Interest accrued	(2,384)	(9,300)
Deferred fuel costs	(18,280)	(50,620)
Other working capital accounts	(3,156)	(41,481)
Changes in provisions for estimated losses	(41,113)	2,962
Changes in other regulatory assets	55,539	(91,490)
Increase (Decrease) in Regulatory Liabilities	(129,370)	49,352
Changes in pension and other postretirement liabilities	(22,806)	(1,954)
Other Noncash Income (Expense)	149,136	3,054
Net cash flow provided by operating activities	313,799	179,583
INVESTING ACTIVITIES
Construction/capital expenditures	(344,522)	(401,573)
Allowance for equity funds used during construction	14,887	23,914
Change in money pool receivable - net	(84,466)	8,880
Nuclear fuel purchases	(18,052)	(59,422)
Payments for Nuclear Fuel	(18,052)	(59,422)
Proceeds from sale of nuclear fuel	33,889	0
Payments to storm reserve escrow account	(1,113)	(1,651)
Receipts from storm reserve escrow account	40,589	0
Proceeds from nuclear decommissioning trust fund sales	144,962	101,555
Investment in nuclear decommissioning trust funds	(154,065)	(107,690)
Changes in securitization account	(5,348)	(5,405)
Net cash flow used in investing activities	(373,239)	(441,392)
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	1,221,900	1,212,989
Retirement of long-term debt	(603,607)	(642,307)
Change in money pool payable - net	(82,826)	0
Dividends paid:
Common stock	(11,500)	(49,000)
Other	(1,139)	1,926
Net cash flow provided by financing activities	522,828	523,608
Net increase in cash and cash equivalents	463,388	261,799
Cash and cash equivalents at beginning of period	2,006	43,364
Cash paid / (received) during the period for:
Interest - net of amount capitalized	79,794	81,940
Income taxes	(20,684)	0
Entergy Mississippi [Member]
OPERATING ACTIVITIES
Consolidated net income	22,526	15,398
Adjustments to reconcile consolidated net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	51,155	39,088
Deferred income taxes, investment tax credits, and non-current taxes accrued	2,762	12,072
Changes in working capital:
Receivables	17,971	18,364
Fuel inventory	(3,266)	(4,267)
Accounts payable	(8,125)	(5,722)
Taxes accrued	(58,651)	(66,445)
Interest accrued	6,201	(293)
Deferred fuel costs	13,406	17,635
Other working capital accounts	7,849	3,444
Changes in provisions for estimated losses	(47)	(846)
Changes in other regulatory assets	(8,484)	(3,478)
Increase (Decrease) in Regulatory Liabilities	(5,532)	(9,301)
Changes in pension and other postretirement liabilities	(2,482)	269
Other Noncash Income (Expense)	(2,022)	(5,926)
Net cash flow provided by operating activities	33,261	9,992
INVESTING ACTIVITIES
Construction/capital expenditures	(124,986)	(97,487)
Allowance for equity funds used during construction	1,439	1,913
Change in money pool receivable - net	44,693	41,380
Payments to Acquire Buildings	24,633	0
Decrease in other investments	(128)	(182)
Net cash flow used in investing activities	(103,615)	(54,376)
Proceeds from the issuance of:
Change in money pool payable - net	19,006	10,925
Dividends paid:
Common stock	(2,500)	0
Other	2,266	(2,610)
Net cash flow provided by financing activities	18,772	8,315
Net increase in cash and cash equivalents	(51,582)	(36,069)
Cash and cash equivalents at beginning of period	51,601	36,954
Cash paid / (received) during the period for:
Interest - net of amount capitalized	9,800	14,193
Entergy New Orleans [Member]
OPERATING ACTIVITIES
Consolidated net income	11,186	9,023
Adjustments to reconcile consolidated net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	15,075	14,164
Deferred income taxes, investment tax credits, and non-current taxes accrued	1,339	9,743
Changes in working capital:
Receivables	4,039	(20)
Fuel inventory	(25)	1,529
Accounts payable	(5,291)	8,298
Taxes accrued	122	(4,443)
Interest accrued	(929)	650
Deferred fuel costs	3,702	(71)
Other working capital accounts	(10,795)	(15,144)
Changes in provisions for estimated losses	923	454
Changes in other regulatory assets	1,867	(16,528)
Increase (Decrease) in Regulatory Liabilities	(9,599)	(8,634)
Changes in pension and other postretirement liabilities	(4,878)	(1,706)
Other Noncash Income (Expense)	10,582	19,207
Net cash flow provided by operating activities	17,318	16,522
INVESTING ACTIVITIES
Construction/capital expenditures	(60,001)	(57,788)
Allowance for equity funds used during construction	2,485	2,290
Change in money pool receivable - net	(7,979)	22,016
Payments to storm reserve escrow account	(314)	(451)
Changes in securitization account	(2,882)	(2,850)
Net cash flow used in investing activities	(68,691)	(36,783)
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	139,116	0
Retirement of long-term debt	(20,000)	0
Change in money pool payable - net	0	1,877
Dividends paid:
Other	(445)	(499)
Net cash flow provided by financing activities	118,671	1,378
Net increase in cash and cash equivalents	67,298	(18,883)
Cash and cash equivalents at beginning of period	6,017	19,677
Cash paid / (received) during the period for:
Interest - net of amount capitalized	7,275	5,027
Entergy Texas [Member]
OPERATING ACTIVITIES
Consolidated net income	32,707	21,342
Adjustments to reconcile consolidated net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	42,566	37,037
Deferred income taxes, investment tax credits, and non-current taxes accrued	3,921	(10,123)
Changes in working capital:
Receivables	1,221	65,394
Fuel inventory	(1,127)	(173)
Accounts payable	(35,288)	(57,447)
Taxes accrued	(20,597)	(9,465)
Interest accrued	(7,380)	(4,638)
Deferred fuel costs	8,138	8,331
Other working capital accounts	5,004	(913)
Changes in provisions for estimated losses	5	1,074
Changes in other regulatory assets	34,309	1,358
Increase (Decrease) in Regulatory Liabilities	(8,854)	(24,365)
Changes in pension and other postretirement liabilities	(9,086)	(1,120)
Other Noncash Income (Expense)	(8,425)	16,359
Net cash flow provided by operating activities	37,114	42,651
INVESTING ACTIVITIES
Construction/capital expenditures	(236,984)	(176,186)
Allowance for equity funds used during construction	10,641	5,111
Change in money pool receivable - net	(17,911)	(3,571)
Changes in securitization account	11,604	10,724
Net cash flow used in investing activities	(232,650)	(163,922)
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	194,631	692,633
Retirement of long-term debt	(26,864)	(525,841)
Change in money pool payable - net	0	(22,389)
Dividends paid:
Preferred stock	(653)	0
Other	206	(959)
Net cash flow provided by financing activities	342,320	143,444
Net increase in cash and cash equivalents	146,784	22,173
Cash and cash equivalents at beginning of period	12,929	56
Cash paid / (received) during the period for:
Interest - net of amount capitalized	29,699	26,002
Income taxes	(2,358)	0
Proceeds from Contributions from Parent	175,000	0
System Energy [Member]
OPERATING ACTIVITIES
Consolidated net income	28,513	23,578
Adjustments to reconcile consolidated net income to net cash flow provided by operating activities:
Depreciation, amortization, and decommissioning, including nuclear fuel amortization	47,041	53,731
Deferred income taxes, investment tax credits, and non-current taxes accrued	(5,764)	4,975
Changes in working capital:
Receivables	22,292	(7,613)
Accounts payable	15,049	(5,182)
Taxes accrued	(3,590)	(13,575)
Interest accrued	(201)	(3,150)
Other working capital accounts	(30,385)	3,635
Changes in other regulatory assets	(3,893)	(3,730)
Increase (Decrease) in Regulatory Liabilities	(135,561)	70,486
Changes in pension and other postretirement liabilities	(2,587)	319
Other Noncash Income (Expense)	129,528	(65,757)
Net cash flow provided by operating activities	60,442	57,717
INVESTING ACTIVITIES
Construction/capital expenditures	(60,551)	(25,557)
Allowance for equity funds used during construction	3,584	1,589
Change in money pool receivable - net	42,479	81,635
Nuclear fuel purchases	(69,022)	(3)
Payments for Nuclear Fuel	(69,022)	(3)
Proceeds from sale of nuclear fuel	9,503	18,280
Proceeds from nuclear decommissioning trust fund sales	132,661	56,988
Investment in nuclear decommissioning trust funds	(138,186)	(62,223)
Net cash flow used in investing activities	(79,532)	70,709
Proceeds from the issuance of:
Proceeds from the issuance of long-term debt	243,559	529,493
Retirement of long-term debt	(186,904)	(549,803)
Dividends paid:
Common stock	(13,653)	(45,500)
Net cash flow provided by financing activities	43,002	(65,810)
Net increase in cash and cash equivalents	23,912	62,616
Cash and cash equivalents at beginning of period	68,534	95,685
Cash paid / (received) during the period for:
Interest - net of amount capitalized	$ 8,598	$ 12,461