Risk Management and Fair Values (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	$ 3,502,908	$ 1,883,021
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	9,992,000	8,522,000
Cash and Cash Equivalents, Fair Value Disclosure	3,503,000	1,883,000
Asset Recovery Damaged Property Costs, Noncurrent	311,550	308,784
Liabilities, Fair Value Disclosure	5,000	8,000
Prepaid Expenses and Other Current Assets
Liabilities, Fair Value Disclosure [Abstract]
Other Restricted Assets, Current	7,000	1,000
Natural Gas Swaps | Not Designated as Hedging Instrument [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	5,000	5,000
Derivative Liability, Subject to Master Netting Arrangement, after Offset	5,000	5,000
Natural Gas Swaps
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		5,000
Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		3,000
Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	2,410,000	2,202,000
Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	79,000	51,000
Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	11,000	27,000
Natural Gas Swaps
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	5,000
Interest Rate Swap
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	4,000	1,000
Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	4,915,000	3,149,000
Cash and Cash Equivalents, Fair Value Disclosure	3,503,000	1,883,000
Other Restricted Assets, Current	7,000	1,000
Asset Recovery Damaged Property Costs, Noncurrent	312,000	309,000
Liabilities, Fair Value Disclosure	5,000	5,000
Fair Value, Inputs, Level 1 [Member] | Natural Gas Swaps
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		5,000
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	1,014,000	905,000
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	79,000	51,000
Fair Value, Inputs, Level 1 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 1 [Member] | Natural Gas Swaps
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	5,000
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,400,000	1,298,000
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Other Restricted Assets, Current	0	0
Asset Recovery Damaged Property Costs, Noncurrent	0	0
Liabilities, Fair Value Disclosure	0	3,000
Fair Value, Inputs, Level 2 [Member] | Natural Gas Swaps
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		3,000
Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	1,396,000	1,297,000
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 2 [Member] | Natural Gas Swaps
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	4,000	1,000
Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	11,000	27,000
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Other Restricted Assets, Current	0	0
Asset Recovery Damaged Property Costs, Noncurrent	0	0
Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Natural Gas Swaps
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	11,000	27,000
Fair Value, Inputs, Level 3 [Member] | Natural Gas Swaps
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	3,666,000	4,048,000
Entergy New Orleans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	68,941	110,238
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	144,200	185,800
Cash and Cash Equivalents, Fair Value Disclosure	68,900	110,200
Asset Recovery Damaged Property Costs, Noncurrent	74,480	73,822
Entergy New Orleans [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	800	1,800
Entergy New Orleans [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	143,400	184,000
Cash and Cash Equivalents, Fair Value Disclosure	68,900	110,200
Asset Recovery Damaged Property Costs, Noncurrent	74,500	73,800
Entergy New Orleans [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	0	0
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Asset Recovery Damaged Property Costs, Noncurrent	0	0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	800	1,800
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Asset Recovery Damaged Property Costs, Noncurrent	0	0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	800	1,800
Entergy Mississippi [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	1,082,996	341,457
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,083,100	341,900
Cash and Cash Equivalents, Fair Value Disclosure	1,083,000	341,500
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset		400
Entergy Mississippi [Member] | Natural Gas Swaps | Not Designated as Hedging Instrument [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	(5,300)
Derivative Liability, Subject to Master Netting Arrangement, after Offset	5,300	5,300
Entergy Mississippi [Member] | Natural Gas Swaps and Options [Member] | Other Current Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset		5,300
Entergy Mississippi [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	100
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		5,300
Entergy Mississippi [Member] | Natural Gas Swaps
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		400
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	5,300
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,083,000	341,500
Cash and Cash Equivalents, Fair Value Disclosure	1,083,000	341,500
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		5,300
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member] | Natural Gas Swaps
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	5,300
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	0	0
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Natural Gas Swaps
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	100	400
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	100
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Natural Gas Swaps
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		400
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	0
Entergy Louisiana [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	1,238,715	776,724
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	4,173,200	3,782,200
Cash and Cash Equivalents, Fair Value Disclosure	1,238,700	776,700
Asset Recovery Damaged Property Costs, Noncurrent	237,070	234,961
Entergy Louisiana [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	1,045,800	992,600
Entergy Louisiana [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	24,200	22,800
Entergy Louisiana [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	7,100	16,700
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,880,200	1,407,700
Cash and Cash Equivalents, Fair Value Disclosure	1,238,700	776,700
Asset Recovery Damaged Property Costs, Noncurrent	237,100	235,000
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	380,200	373,200
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	24,200	22,800
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	665,600	619,400
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Asset Recovery Damaged Property Costs, Noncurrent	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	665,600	619,400
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	7,100	16,700
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Asset Recovery Damaged Property Costs, Noncurrent	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	7,100	16,700
Entergy Louisiana [Member] | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	1,620,300	1,738,400
Entergy Arkansas [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	563,429	268,522
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	2,341,400	2,090,300
Cash and Cash Equivalents, Fair Value Disclosure	563,400	268,500
Entergy Arkansas [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	686,600	614,000
Entergy Arkansas [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	49,800	20,000
Entergy Arkansas [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	2,400	5,500
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	935,400	540,400
Cash and Cash Equivalents, Fair Value Disclosure	563,400	268,500
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	322,200	251,900
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	49,800	20,000
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	364,400	362,100
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	364,400	362,100
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	2,400	5,500
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	2,400	5,500
Entergy Arkansas [Member] | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	1,039,200	1,182,300
Entergy Texas [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	433,763	274,908
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	445,600	279,000
Cash and Cash Equivalents, Fair Value Disclosure	433,800	274,900
Other Restricted Assets, Current	7,207	1,480
Entergy Texas [Member] | Prepaid Expenses and Other Current Assets
Liabilities, Fair Value Disclosure [Abstract]
Other Restricted Assets, Current	7,200	1,500
Entergy Texas [Member] | Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		3,000
Entergy Texas [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	900	2,100
Entergy Texas [Member] | Interest Rate Swap
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	3,700	500
Entergy Texas [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	441,000	276,400
Cash and Cash Equivalents, Fair Value Disclosure	433,800	274,900
Other Restricted Assets, Current	7,200	1,500
Entergy Texas [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Entergy Texas [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Texas [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	0	500
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Other Restricted Assets, Current	0	0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		3,000
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	500
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	4,600	2,100
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Other Restricted Assets, Current	0	0
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	900	2,100
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	3,700	0
System Energy [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,689,300	1,730,700
System Energy [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	678,000	595,000
System Energy [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	4,700	8,600
System Energy [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	316,600	289,100
System Energy [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	311,900	280,500
System Energy [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	4,700	8,600
System Energy [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	366,100	314,500
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	366,100	314,500
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	0	0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
System Energy [Member] | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	$ 1,006,600	$ 1,127,100