Risk Management and Fair Values (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	$ 1,229,910	$ 60,939
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current	17,000
Replacement Reserve Escrow	328,000	323,000
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	6,750,000	5,277,000
Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	6,000	11,000
Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	1,761,000	1,770,000
Common trust funds valued using Net Asset Value [Domain]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	3,270,000	3,070,000
Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	9,000	21,000
Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	135,000	24,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	1,230,000	61,000
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current	17,000	8,000
Replacement Reserve Escrow	328,000	323,000
Equity Securities, FV-NI, Current	135,000	24,000
Debt Securities	613,000	611,000
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	2,323,000	1,027,000
Fair Value, Inputs, Level 1 [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	6,000	11,000
Fair Value, Inputs, Level 1 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	0
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current	0	0
Replacement Reserve Escrow	0	0
Equity Securities, FV-NI, Current	0	0
Debt Securities	1,148,000	1,159,000
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,148,000	1,159,000
Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	0	0
Fair Value, Inputs, Level 2 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	0
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current	0	0
Replacement Reserve Escrow	0	0
Equity Securities, FV-NI, Current	0	0
Debt Securities	0	0
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	9,000	21,000
Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	9,000	21,000
Entergy New Orleans [Member]
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current	5,402	2,426
Replacement Reserve Escrow	80,600	78,700
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	86,500	82,200
Entergy New Orleans [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		600
Entergy New Orleans [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	500	1,100
Entergy New Orleans [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current	5,400	2,400
Replacement Reserve Escrow	80,600	78,700
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	86,000	81,100
Entergy New Orleans [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		600
Entergy New Orleans [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current	0	0
Replacement Reserve Escrow	0	0
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	0	0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current	0	0
Replacement Reserve Escrow	0	0
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	500	1,100
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	500	1,100
Entergy Mississippi [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	2,097	6,600
Assets, Fair Value Disclosure [Abstract]
Replacement Reserve Escrow	700	700
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	3,400	8,700
Entergy Mississippi [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	6,500	10,100
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	600	1,400
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	2,100	6,600
Assets, Fair Value Disclosure [Abstract]
Replacement Reserve Escrow	700	700
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	2,800	7,300
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	6,500	10,100
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	0
Assets, Fair Value Disclosure [Abstract]
Replacement Reserve Escrow	0	0
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	0	0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	0	0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	0
Assets, Fair Value Disclosure [Abstract]
Replacement Reserve Escrow	0	0
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	600	1,400
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	0	0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	600	1,400
Entergy Louisiana [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	772,792	517
Assets, Fair Value Disclosure [Abstract]
Replacement Reserve Escrow	247,100	243,800
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	3,263,600	2,361,500
Entergy Louisiana [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		400
Entergy Louisiana [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	780,400	788,100
Entergy Louisiana [Member] | Common trust funds valued using Net Asset Value [Domain]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	1,416,200	1,304,700
Entergy Louisiana [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	4,100	9,800
Entergy Louisiana [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	43,000	14,600
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	772,800	500
Assets, Fair Value Disclosure [Abstract]
Replacement Reserve Escrow	247,100	243,800
Equity Securities, FV-NI, Current	43,000	14,600
Debt Securities	269,400	271,700
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,332,300	530,600
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		400
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	0
Assets, Fair Value Disclosure [Abstract]
Replacement Reserve Escrow	0	0
Equity Securities, FV-NI, Current	0	0
Debt Securities	511,000	516,400
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	511,000	516,400
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	0
Assets, Fair Value Disclosure [Abstract]
Replacement Reserve Escrow	0	0
Equity Securities, FV-NI, Current	0	0
Debt Securities	0	0
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	4,100	9,800
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	4,100	9,800
Entergy Arkansas [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	32,854	3,112
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,537,600	1,423,100
Entergy Arkansas [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	498,800	496,900
Entergy Arkansas [Member] | Common trust funds valued using Net Asset Value [Domain]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	915,000	910,700
Entergy Arkansas [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	2,800	6,000
Entergy Arkansas [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	88,100	6,400
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	32,900	3,100
Assets, Fair Value Disclosure [Abstract]
Equity Securities, FV-NI, Current	88,100	6,400
Debt Securities	137,700	129,900
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	258,700	139,400
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	0
Assets, Fair Value Disclosure [Abstract]
Equity Securities, FV-NI, Current	0	0
Debt Securities	361,100	367,000
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	361,100	367,000
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	0
Assets, Fair Value Disclosure [Abstract]
Equity Securities, FV-NI, Current	0	0
Debt Securities	0	0
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	2,800	6,000
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	2,800	6,000
Entergy Texas [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	177,910	20,489
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current	11,153	5,195
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	190,300	28,100
Entergy Texas [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	1,200	2,400
Entergy Texas [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	177,900	20,500
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current	11,200	5,200
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	189,100	25,700
Entergy Texas [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	0
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current	0	0
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	0	0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	0
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current	0	0
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,200	2,400
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	1,200	2,400
System Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	111,384	0
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,535,600	1,342,300
System Energy [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	481,500	485,200
System Energy [Member] | Common trust funds valued using Net Asset Value [Domain]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	939,000	854,400
System Energy [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	3,700	2,700
System Energy [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	111,400
Assets, Fair Value Disclosure [Abstract]
Equity Securities, FV-NI, Current	3,700	2,700
Debt Securities	205,800	209,500
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	320,900	212,200
System Energy [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0
Assets, Fair Value Disclosure [Abstract]
Equity Securities, FV-NI, Current	0	0
Debt Securities	275,700	275,700
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	275,700	275,700
System Energy [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0
Assets, Fair Value Disclosure [Abstract]
Equity Securities, FV-NI, Current	0	0
Debt Securities	0	0
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	$ 0	0
Entergy Corporation [Member]
Assets, Fair Value Disclosure [Abstract]
Restricted Cash and Cash Equivalents, Current		$ 8,000