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Risk Management and Fair Values (Assets And Liabilities At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash Equivalents, at Carrying Value $ 955,821   $ 1,630,248
Assets at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 28,000   42,000
Replacement Reserve Escrow 49,000   148,000
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 6,324,000   9,122,000
Issuance of Financial Transmission Rights 0 $ 0  
Fixed Transmission Rights (FTRs) [Member]      
Liabilities at fair value on a recurring basis      
Issuance of Financial Transmission Rights 12,000 23,000  
Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     7,000
Debt Securities [Member]      
Assets at fair value on a recurring basis      
Decommissioning Fund Investments, Fair Value 2,055,000   2,617,000
Common trust funds valued using Net Asset Value [Domain]      
Assets at fair value on a recurring basis      
Decommissioning Fund Investments, Fair Value 3,081,000   3,103,000
Power Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset     38,000
Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 47,000   2,000
Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 8,000   9,000
Equity Securities [Member]      
Assets at fair value on a recurring basis      
Decommissioning Fund Investments, Fair Value 100,000   1,533,000
Fair Value Inputs Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash Equivalents, at Carrying Value 956,000   1,630,000
Assets at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 28,000   42,000
Replacement Reserve Escrow 49,000   148,000
Equity Securities, FV-NI 100,000   1,533,000
Debt Securities 733,000   919,000
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 1,905,000   4,273,000
Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     6,000
Fair Value Inputs Level 1 [Member] | Power Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset     0
Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 39,000   1,000
Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
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 at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 0   0
Replacement Reserve Escrow 0   0
Equity Securities, FV-NI 0   0
Debt Securities 1,322,000   1,698,000
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 1,330,000   1,699,000
Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     1,000
Fair Value, Inputs, Level 2 [Member] | Power Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset     0
Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 8,000   1,000
Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
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 at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 0   0
Replacement Reserve Escrow 0   0
Equity Securities, FV-NI 0   0
Debt Securities 0   0
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 8,000   47,000
Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     0
Fair Value, Inputs, Level 3 [Member] | Power Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset     38,000
Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 0   0
Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 8,000   9,000
Entergy New Orleans [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash Equivalents, at Carrying Value 26,362   0
Assets at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 5,744   3,364
Replacement Reserve Escrow     83,000
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 34,700   86,500
Entergy New Orleans [Member] | Fixed Transmission Rights (FTRs) [Member]      
Liabilities at fair value on a recurring basis      
Issuance of Financial Transmission Rights 400 (100)  
Entergy New Orleans [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     300
Entergy New Orleans [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 2,300    
Entergy New Orleans [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 300   100
Entergy New Orleans [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 26,400    
Assets at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 5,700   3,400
Replacement Reserve Escrow     83,000
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 34,400   86,400
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     300
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 2,300    
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 0   0
Entergy New Orleans [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 at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 0   0
Replacement Reserve Escrow     0
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 0   0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 0    
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 0   0
Entergy New Orleans [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 at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 0   0
Replacement Reserve Escrow     0
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 300   100
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 0    
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 300   100
Entergy Mississippi [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash Equivalents, at Carrying Value 2   7
Assets at fair value on a recurring basis      
Replacement Reserve Escrow 48,900   64,600
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 72,700   65,200
Entergy Mississippi [Member] | Fixed Transmission Rights (FTRs) [Member]      
Liabilities at fair value on a recurring basis      
Issuance of Financial Transmission Rights 1,700 1,400  
Entergy Mississippi [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     5,000
Entergy Mississippi [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 23,200    
Entergy Mississippi [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 600   600
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member]      
Assets at fair value on a recurring basis      
Replacement Reserve Escrow 48,900   64,600
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 72,100   64,600
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     5,000
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 23,200    
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 0   0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets at fair value on a recurring basis      
Replacement Reserve Escrow 0   0
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 0   0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 0    
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 0   0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets at fair value on a recurring basis      
Replacement Reserve Escrow 0   0
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 600   600
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 0    
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 600   600
Entergy Louisiana [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash Equivalents, at Carrying Value 266,292   726,717
Assets at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 5,500   2,700
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 2,283,600   2,528,900
Entergy Louisiana [Member] | Fixed Transmission Rights (FTRs) [Member]      
Liabilities at fair value on a recurring basis      
Issuance of Financial Transmission Rights 4,100 13,200  
Entergy Louisiana [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     1,600
Entergy Louisiana [Member] | Debt Securities [Member]      
Assets at fair value on a recurring basis      
Decommissioning Fund Investments, Fair Value 705,800   632,200
Entergy Louisiana [Member] | Common trust funds valued using Net Asset Value [Domain]      
Assets at fair value on a recurring basis      
Decommissioning Fund Investments, Fair Value 1,268,200   1,153,100
Entergy Louisiana [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 21,900   1,300
Entergy Louisiana [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 2,600   4,200
Entergy Louisiana [Member] | Equity Securities [Member]      
Assets at fair value on a recurring basis      
Decommissioning Fund Investments, Fair Value 13,300   8,700
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 266,300   726,700
Assets at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 5,500   2,700
Equity Securities, FV-NI 13,300   8,700
Debt Securities 218,100   172,400
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 522,800   911,300
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     300
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 19,600   800
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
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 at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 0   0
Equity Securities, FV-NI 0   0
Debt Securities 487,700   459,800
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 490,000   460,300
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     1,300
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 2,300   500
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
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 at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 0   0
Equity Securities, FV-NI 0   0
Debt Securities 0   0
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 2,600   4,200
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member]      
Liabilities at fair value on a recurring basis      
Liabilities, Fair Value Disclosure on Recurring Basis     0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts Assets [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 0   0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 2,600   4,200
Entergy Arkansas [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash Equivalents, at Carrying Value 96,470   168,020
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 1,475,200   1,444,600
Entergy Arkansas [Member] | Fixed Transmission Rights (FTRs) [Member]      
Liabilities at fair value on a recurring basis      
Issuance of Financial Transmission Rights 2,800 6,500  
Entergy Arkansas [Member] | Debt Securities [Member]      
Assets at fair value on a recurring basis      
Decommissioning Fund Investments, Fair Value 477,900   447,900
Entergy Arkansas [Member] | Common trust funds valued using Net Asset Value [Domain]      
Assets at fair value on a recurring basis      
Decommissioning Fund Investments, Fair Value 827,200   824,700
Entergy Arkansas [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 2,400   2,700
Entergy Arkansas [Member] | Equity Securities [Member]      
Assets at fair value on a recurring basis      
Decommissioning Fund Investments, Fair Value 71,200   1,300
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 96,500   168,000
Assets at fair value on a recurring basis      
Equity Securities, FV-NI 71,200   1,300
Debt Securities 124,700   98,200
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 292,400   267,500
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
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 at fair value on a recurring basis      
Equity Securities, FV-NI 0   0
Debt Securities 353,200   349,700
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 353,200   349,700
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
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 at fair value on a recurring basis      
Equity Securities, FV-NI 0   0
Debt Securities 0   0
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 2,400   2,700
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 2,400   2,700
Entergy Texas [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash Equivalents, at Carrying Value 0   248,570
Assets at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 17,176   36,233
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 18,900   286,400
Entergy Texas [Member] | Fixed Transmission Rights (FTRs) [Member]      
Liabilities at fair value on a recurring basis      
Issuance of Financial Transmission Rights 2,700 $ 2,400  
Entergy Texas [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 1,700   1,600
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     248,600
Assets at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 17,200   36,200
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 17,200   284,800
Entergy Texas [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
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
Assets at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 0   0
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 0   0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
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
Assets at fair value on a recurring basis      
Restricted Cash and Cash Equivalents, Current 0   0
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 1,700   1,600
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member]      
Assets at fair value on a recurring basis      
Derivative Asset 1,700   1,600
System Energy [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash Equivalents, at Carrying Value 163,036   216,383
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 1,473,500   1,432,300
System Energy [Member] | Debt Securities [Member]      
Assets at fair value on a recurring basis      
Decommissioning Fund Investments, Fair Value 468,000   427,700
System Energy [Member] | Common trust funds valued using Net Asset Value [Domain]      
Assets at fair value on a recurring basis      
Decommissioning Fund Investments, Fair Value 837,400   784,400
System Energy [Member] | Equity Securities [Member]      
Assets at fair value on a recurring basis      
Decommissioning Fund Investments, Fair Value 5,100   3,800
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 163,000   216,400
Assets at fair value on a recurring basis      
Equity Securities, FV-NI 5,100   3,800
Debt Securities 219,300   177,300
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 387,400   397,500
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   0
Assets at fair value on a recurring basis      
Equity Securities, FV-NI 0   0
Debt Securities 248,700   250,400
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure 248,700   250,400
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   0
Assets at fair value on a recurring basis      
Equity Securities, FV-NI 0   0
Debt Securities 0   0
Liabilities at fair value on a recurring basis      
Assets, Fair Value Disclosure $ 0   $ 0