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Decommissioning Trust Funds (Available For Sale Securities Continuous Unrealized Loss Position Fair Value) (Details) - Debt Securities [Member] - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Fair Value $ 236.0 $ 652.0
More than 12 months Fair Value 67.0 782.0
Total Fair Value 303.0 1,434.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2.0 9.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 26.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 2.0 35.0
Entergy Arkansas [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Fair Value 51.5 65.8
More than 12 months Fair Value 21.0 231.1
Total Fair Value 72.5 296.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.8 0.5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.1 7.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0.9 8.2
Entergy Louisiana [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Fair Value 49.3 170.1
More than 12 months Fair Value 12.9 145.8
Total Fair Value 62.2 315.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.3 2.1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 3.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0.3 6.0
System Energy [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Fair Value 38.8 89.7
More than 12 months Fair Value 4.3 79.8
Total Fair Value 43.1 169.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.1 2.4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 3.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 0.1 $ 5.8