Decommissioning Trust Funds (Available For Sale Securities Continuous Unrealized Loss Position Fair Value) (Details) - Debt Securities [Member] - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 391.0	$ 840.0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	961.0	666.0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	1,352.0	1,506.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	13.0	63.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	147.0	138.0
Debt Securities, Available-for-sale, Unrealized Loss Position	160.0	201.0
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	52.3	197.6
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	380.4	260.1
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	432.7	457.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1.4	18.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	55.4	50.5
Debt Securities, Available-for-sale, Unrealized Loss Position	56.8	69.3
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	258.1	409.9
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	304.8	207.5
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	562.9	617.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	6.7	24.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	43.7	42.9
Debt Securities, Available-for-sale, Unrealized Loss Position	50.4	67.5
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	80.8	231.9
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	275.2	198.0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	356.0	429.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	4.3	19.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	48.3	44.5
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 52.6	$ 63.7

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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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 less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months.

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