Decommissioning Trust Funds (Schedule of Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	$ 568,000	$ 517,000
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	575,000	504,000
Available for Sale Securities Debt Maturities After Ten to Fifteen Years Fair Value	120,000	121,000
Available for Sale Securities, Debt Maturities After Fifteen to Twenty Years, Fair Value	186,000	179,000
Available for Sale Securities Debt Maturities After Twenty Years Fair Value	397,000	367,000
Debt Securities, Available-for-Sale	1,922,000	1,770,000
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	76,000	82,000
Decommissioning Fund Investments	5,265,003	4,863,710
Entergy Arkansas [Member]
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	156,300	132,200
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	234,800	205,700
Available for Sale Securities Debt Maturities After Ten to Fifteen Years Fair Value	31,700	39,900
Available for Sale Securities, Debt Maturities After Fifteen to Twenty Years, Fair Value	59,800	49,600
Available for Sale Securities Debt Maturities After Twenty Years Fair Value	28,300	24,200
Debt Securities, Available-for-Sale	554,400	496,900
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	43,500	45,300
Decommissioning Fund Investments	1,522,508	1,414,009
Entergy Louisiana [Member]
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	189,200	181,600
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	186,900	170,000
Available for Sale Securities Debt Maturities After Ten to Fifteen Years Fair Value	79,800	70,200
Available for Sale Securities, Debt Maturities After Fifteen to Twenty Years, Fair Value	84,700	90,200
Available for Sale Securities Debt Maturities After Twenty Years Fair Value	244,700	244,700
Debt Securities, Available-for-Sale	812,600	788,100
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	27,300	31,400
Decommissioning Fund Investments	2,292,174	2,107,384
System Energy [Member]
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	222,100	203,400
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	153,500	128,600
Available for Sale Securities Debt Maturities After Ten to Fifteen Years Fair Value	8,100	10,700
Available for Sale Securities, Debt Maturities After Fifteen to Twenty Years, Fair Value	41,000	38,800
Available for Sale Securities Debt Maturities After Twenty Years Fair Value	124,500	98,400
Debt Securities, Available-for-Sale	554,600	485,200
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	5,400	5,300
Decommissioning Fund Investments	$ 1,450,321	$ 1,342,317