Decommissioning Trust Funds (Schedule of Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Sep. 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	$ 627,000	$ 517,000
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	604,000	504,000
Available for Sale Securities Debt Maturities After Ten to Fifteen Years Fair Value	138,000	121,000
Available for Sale Securities, Debt Maturities After Fifteen to Twenty Years, Fair Value	209,000	179,000
Available for Sale Securities Debt Maturities After Twenty Years Fair Value	421,000	367,000
Debt Securities, Available-for-Sale	2,051,000	1,770,000
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	52,000	82,000
Decommissioning Fund Investments	5,541,880	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	156,200	132,200
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	248,500	205,700
Available for Sale Securities Debt Maturities After Ten to Fifteen Years Fair Value	38,400	39,900
Available for Sale Securities, Debt Maturities After Fifteen to Twenty Years, Fair Value	63,800	49,600
Available for Sale Securities Debt Maturities After Twenty Years Fair Value	48,100	24,200
Debt Securities, Available-for-Sale	597,500	496,900
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	42,500	45,300
Decommissioning Fund Investments	1,601,796	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	215,000	181,600
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	199,300	170,000
Available for Sale Securities Debt Maturities After Ten to Fifteen Years Fair Value	86,100	70,200
Available for Sale Securities, Debt Maturities After Fifteen to Twenty Years, Fair Value	95,300	90,200
Available for Sale Securities Debt Maturities After Twenty Years Fair Value	274,800	244,700
Debt Securities, Available-for-Sale	877,600	788,100
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	7,100	31,400
Decommissioning Fund Investments	2,414,795	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	255,600	203,400
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	156,400	128,600
Available for Sale Securities Debt Maturities After Ten to Fifteen Years Fair Value	13,100	10,700
Available for Sale Securities, Debt Maturities After Fifteen to Twenty Years, Fair Value	49,900	38,800
Available for Sale Securities Debt Maturities After Twenty Years Fair Value	98,200	98,400
Debt Securities, Available-for-Sale	575,900	485,200
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	2,700	5,300
Decommissioning Fund Investments	$ 1,525,289	$ 1,342,317