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Decommissioning Trust Funds (Available For Sale Securities Continuous Unrealized Loss Position Fair Value) (Details) - Debt Securities [Member] - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Fair Value $ 1,748.0 $ 187.0
More than 12 months Fair Value 3.0 2.0
Total Fair Value 1,751.0 189.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 43.0 3.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 43.0 3.0
Entergy Arkansas [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Fair Value 139.1 29.9
More than 12 months Fair Value 0.0 0.0
Total Fair Value 139.1 29.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 6.8 0.3
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 6.8 0.3
Entergy Louisiana [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Fair Value 171.7 36.4
More than 12 months Fair Value 2.3 0.8
Total Fair Value 174.0 37.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 4.6 0.5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 4.6 0.5
System Energy [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Fair Value 157.5 28.9
More than 12 months Fair Value 0.0 0.0
Total Fair Value 157.5 28.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 5.0 0.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 5.0 $ 0.8