Decommissioning Trust Funds (Schedule of Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Mar. 31, 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	$ 503,000	$ 517,000
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	526,000	504,000
Available for Sale Securities Debt Maturities After Ten to Fifteen Years Fair Value	132,000	121,000
Available for Sale Securities, Debt Maturities After Fifteen to Twenty Years, Fair Value	168,000	179,000
Available for Sale Securities Debt Maturities After Twenty Years Fair Value	361,000	367,000
Debt Securities, Available-for-Sale	1,761,000	1,770,000
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	71,000	82,000
Decommissioning Fund Investments	5,165,779	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	133,900	132,200
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	206,800	205,700
Available for Sale Securities Debt Maturities After Ten to Fifteen Years Fair Value	40,100	39,900
Available for Sale Securities, Debt Maturities After Fifteen to Twenty Years, Fair Value	53,900	49,600
Available for Sale Securities Debt Maturities After Twenty Years Fair Value	24,400	24,200
Debt Securities, Available-for-Sale	498,800	496,900
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	39,700	45,300
Decommissioning Fund Investments	1,501,909	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	172,700	181,600
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	181,700	170,000
Available for Sale Securities Debt Maturities After Ten to Fifteen Years Fair Value	80,800	70,200
Available for Sale Securities, Debt Maturities After Fifteen to Twenty Years, Fair Value	76,000	90,200
Available for Sale Securities Debt Maturities After Twenty Years Fair Value	242,400	244,700
Debt Securities, Available-for-Sale	780,400	788,100
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	26,800	31,400
Decommissioning Fund Investments	2,239,614	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	196,600	203,400
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	137,100	128,600
Available for Sale Securities Debt Maturities After Ten to Fifteen Years Fair Value	11,500	10,700
Available for Sale Securities, Debt Maturities After Fifteen to Twenty Years, Fair Value	37,900	38,800
Available for Sale Securities Debt Maturities After Twenty Years Fair Value	94,300	98,400
Debt Securities, Available-for-Sale	481,500	485,200
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	4,100	5,300
Decommissioning Fund Investments	$ 1,424,256	$ 1,342,317