Decommissioning Trust Funds (Available For Sale Securities Continuous Unrealized Loss Position Fair Value) (Details) - Debt Securities [Member] - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 1,211.0	$ 770.0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	339.0	99.0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	1,550.0	869.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	165.0	8.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	67.0	4.0
Debt Securities, Available-for-sale, Unrealized Loss Position	232.0	12.0
Entergy Arkansas [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	288.3	183.8
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	159.8	39.5
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	448.1	223.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	40.5	2.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	33.2	1.8
Debt Securities, Available-for-sale, Unrealized Loss Position	73.7	4.7
Entergy Louisiana [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	579.8	206.9
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	76.5	42.9
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	656.3	249.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	68.8	1.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	17.8	1.9
Debt Securities, Available-for-sale, Unrealized Loss Position	86.6	3.3
System Energy [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	342.7	276.6
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	102.2	11.3
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	444.9	287.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	55.2	2.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	16.0	0.6
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 71.2	$ 2.9

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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