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Risk Management and Fair Values (Assets And Liabilities At Fair Value On A Recurring Basis) (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents, at Carrying Value $ 1,180,342,000 $ 391,480,000
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 47,000,000 47,000,000
Replacement Reserve Escrow 420,000,000 459,000,000
Equity Securities, FV-NI 745,000,000 905,000,000
Debt Securities 3,044,000,000 2,963,000,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 7,518,000,000 7,430,000,000
Gas Hedge Contracts [Member]    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis 9,000,000 7,000,000
Common trust funds valued using Net Asset Value [Domain]    
Assets at fair value on a recurring basis    
Available-for-sale Securities 1,992,000,000 2,536,000,000
Power Contracts Assets [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 85,000,000 118,000,000
Gas Hedge Contracts Assets [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 1,000,000 1,000,000
Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 4,000,000 10,000,000
Fair Value Inputs Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents, at Carrying Value 1,180,000,000 391,000,000
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 47,000,000 47,000,000
Replacement Reserve Escrow 420,000,000 459,000,000
Equity Securities, FV-NI 745,000,000 905,000,000
Debt Securities 1,151,000,000 1,139,000,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 3,543,000,000 2,941,000,000
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 7,000,000 5,000,000
Fair Value Inputs Level 1 [Member] | Power Contracts Assets [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 0 0
Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts Assets [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 0 0
Fair Value Inputs Level 1 [Member] | Financial 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 1,893,000,000 1,824,000,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 1,894,000,000 1,825,000,000
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 2,000,000 2,000,000
Fair Value, Inputs, Level 2 [Member] | Power Contracts Assets [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 0 0
Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts Assets [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 1,000,000 1,000,000
Fair Value, Inputs, Level 2 [Member] | Financial 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 89,000,000 128,000,000
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 0
Fair Value, Inputs, Level 3 [Member] | Power Contracts Assets [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 85,000,000 118,000,000
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] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 4,000,000 10,000,000
Entergy New Orleans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents, at Carrying Value 72,289,000 5,991,000
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 4,871,000 1,989,000
Replacement Reserve Escrow 82,900,000 82,600,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 160,100,000 90,900,000
Entergy New Orleans [Member] | Gas Hedge Contracts [Member]    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis   200,000
Entergy New Orleans [Member] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset   300,000
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 72,300,000 6,000,000.0
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 4,900,000 2,000,000.0
Replacement Reserve Escrow 82,900,000 82,600,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 160,100,000 90,600,000
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   200,000
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset   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 0
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 0 0
Replacement Reserve Escrow 0 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] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset   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 0
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 0 0
Replacement Reserve Escrow 0 0
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 0 300,000
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] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset   300,000
Entergy Mississippi [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents, at Carrying Value 7,000 51,590,000
Assets at fair value on a recurring basis    
Replacement Reserve Escrow 80,300,000 80,200,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 80,600,000 132,600,000
Entergy Mississippi [Member] | Gas Hedge Contracts [Member]    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis 4,400,000 2,300,000
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 300,000 800,000
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   51,600,000
Assets at fair value on a recurring basis    
Replacement Reserve Escrow 80,300,000 80,200,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 80,300,000 131,800,000
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 4,400,000 2,300,000
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] | Financial 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]    
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    
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 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Financial 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]    
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    
Replacement Reserve Escrow 0 0
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 300,000 800,000
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 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 300,000 800,000
Entergy Louisiana [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents, at Carrying Value 465,206,000 1,518,000
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 9,000,000.0 3,700,000
Replacement Reserve Escrow 256,400,000 295,900,000
Equity Securities, FV-NI [1] 15,700,000 4,300,000
Debt Securities [1] 603,000,000.0 601,500,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 2,111,500,000 1,870,200,000
Entergy Louisiana [Member] | Gas Hedge Contracts [Member]    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis 4,800,000 4,600,000
Entergy Louisiana [Member] | Common trust funds valued using Net Asset Value [Domain]    
Assets at fair value on a recurring basis    
Available-for-sale Securities [2] 759,200,000 958,000,000.0
Entergy Louisiana [Member] | Gas Hedge Contracts Assets [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 1,100,000 800,000
Entergy Louisiana [Member] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 1,900,000 4,500,000
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 465,200,000 1,500,000
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 9,000,000.0 3,700,000
Replacement Reserve Escrow 256,400,000 295,900,000
Equity Securities, FV-NI [1] 15,700,000 4,300,000
Debt Securities [1] 171,100,000 180,800,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 917,600,000 486,200,000
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 2,500,000 2,400,000
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts Assets [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 200,000 0
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Financial 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
Replacement Reserve Escrow 0 0
Equity Securities, FV-NI [1] 0 0
Debt Securities [1] 431,900,000 420,700,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 432,800,000 421,500,000
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 2,300,000 2,200,000
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts Assets [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 900,000 800,000
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Financial 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
Replacement Reserve Escrow 0 0
Equity Securities, FV-NI [1] 0 0
Debt Securities [1] 0 0
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 1,900,000 4,500,000
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 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] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 1,900,000 4,500,000
Entergy Arkansas [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents, at Carrying Value 136,864,000 0
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 7,480,000 4,036,000
Equity Securities, FV-NI [1] 14,400,000 600,000
Debt Securities [1] 417,800,000 412,800,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 1,119,500,000 1,108,600,000
Entergy Arkansas [Member] | Common trust funds valued using Net Asset Value [Domain]    
Assets at fair value on a recurring basis    
Available-for-sale Securities [2] 541,800,000 687,900,000
Entergy Arkansas [Member] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 1,100,000 3,300,000
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 136,900,000  
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 7,500,000 4,000,000.0
Equity Securities, FV-NI [1] 14,400,000 600,000
Debt Securities [1] 107,200,000 108,700,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 266,000,000.0 113,300,000
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Financial 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  
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 0 0
Equity Securities, FV-NI [1] 0 0
Debt Securities [1] 310,600,000 304,100,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 310,600,000 304,100,000
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Financial 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  
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 0 0
Equity Securities, FV-NI [1] 0 0
Debt Securities [1] 0 0
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 1,100,000 3,300,000
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 1,100,000 3,300,000
Entergy Texas [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents, at Carrying Value 159,683,000 12,904,000
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 26,116,000 37,720,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 186,100,000 51,500,000
Entergy Texas [Member] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 300,000 900,000
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 159,700,000 12,900,000
Assets at fair value on a recurring basis    
Restricted Cash and Cash Equivalents, Current 26,100,000 37,700,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 185,800,000 50,600,000
Entergy Texas [Member] | Fair Value Inputs Level 1 [Member] | Financial 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 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] | Financial 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 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 300,000 900,000
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member]    
Assets at fair value on a recurring basis    
Derivative Asset 300,000 900,000
System Energy [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents, at Carrying Value 92,322,000 68,441,000
Assets at fair value on a recurring basis    
Equity Securities, FV-NI [1] 4,900,000 13,300,000
Debt Securities [1] 408,000,000.0 386,200,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 1,020,700,000 1,122,500,000
System Energy [Member] | Common trust funds valued using Net Asset Value [Domain]    
Assets at fair value on a recurring basis    
Available-for-sale Securities [2] 515,500,000 654,600,000
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 92,300,000 68,400,000
Assets at fair value on a recurring basis    
Equity Securities, FV-NI [1] 4,900,000 13,300,000
Debt Securities [1] 185,100,000 176,300,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 282,300,000 258,000,000.0
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 [1] 0 0
Debt Securities [1] 222,900,000 209,900,000
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure 222,900,000 209,900,000
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 [1] 0 0
Debt Securities [1] 0 0
Liabilities at fair value on a recurring basis    
Assets, Fair Value Disclosure $ 0 $ 0
[1]
(a)
The decommissioning trust funds hold equity and fixed income securities. Equity securities are invested to approximate the returns of major market indices.  Fixed income securities are held in various governmental and corporate securities.  See Note 9 to the financial statements herein for additional information on the investment portfolios.
[2]
(b)
Common trust funds are not publicly quoted and are valued by the fund administrators using net asset value as a practical expedient. Accordingly, these funds are not assigned a level in the fair value table. The fund administrator of these investments allows daily trading at the net asset value and trades settle at a later date.