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Decommissioning Trust Funds (Tables)
12 Months Ended
Dec. 31, 2021
Securities Held
The available-for-sale securities held as of December 31, 2021 and 2020 are summarized as follows:
 Fair ValueTotal Unrealized GainsTotal Unrealized Losses
 (In Millions)
2021
Debt Securities$2,177 $65 $12 
2020
Debt Securities$2,617 $197 $3 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of December 31, 2021 and 2020 are as follows:
 20212020
 (In Millions)
Less than 1 year$— ($4)
1 year - 5 years473 672 
5 years - 10 years655 852 
10 years - 15 years389 377 
15 years - 20 years130 144 
20 years+530 576 
Total$2,177 $2,617 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
The fair value and gross unrealized losses of available-for-sale debt securities, summarized by length of time that the securities had been in a continuous loss position, were as follows as of December 31, 2021 and 2020:
December 31, 2021December 31, 2020
Fair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
 (In Millions)
Less than 12 months$770 $8 $187 $3 
More than 12 months99 — 
Total$869 $12 $189 $3 
Entergy Arkansas [Member]  
Securities Held The available-for-sale securities held as of December 31, 2021 and 2020 are summarized as follows:
 Fair ValueTotal Unrealized GainsTotal Unrealized Losses
 (In Millions)
2021
Debt Securities$526.3 $11.4 $4.7 
2020
Debt Securities$447.9 $27.7 $0.3 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of December 31, 2021 and 2020 are as follows:
 20212020
 (In Millions)
Less than 1 year$— $— 
1 year - 5 years91.7 113.1 
5 years - 10 years217.4 189.8 
10 years - 15 years146.0 81.4 
15 years - 20 years35.7 28.5 
20 years+35.5 35.1 
Total$526.3 $447.9 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
The fair value and gross unrealized losses of available-for-sale debt securities, summarized by length of time that the securities had been in a continuous loss position, were as follows as of December 31, 2021 and 2020:
December 31, 2021December 31, 2020
Fair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
(In Millions)
Less than 12 months$183.8 $2.9 $29.9 $0.3 
More than 12 months39.5 1.8 — — 
Total$223.3 $4.7 $29.9 $0.3 
Entergy Louisiana [Member]  
Securities Held The available-for-sale securities held as of December 31, 2021 and 2020 are summarized as follows:
 Fair ValueTotal Unrealized GainsTotal Unrealized Losses
 (In Millions)
2021
Debt Securities$794.2 $31.3 $3.3 
2020
Debt Securities$632.2 $51.3 $0.5 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of December 31, 2021 and 2020 are as follows:
 20212020
 (In Millions)
Less than 1 year$— $— 
1 year - 5 years157.8 117.0 
5 years - 10 years173.0 159.4 
10 years - 15 years123.0 101.2 
15 years - 20 years80.2 66.9 
20 years+260.2 187.7 
Total$794.2 $632.2 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
The fair value and gross unrealized losses of available-for-sale debt securities, summarized by length of time that the securities had been in a continuous loss position, were as follows as of December 31, 2021 and 2020:
December 31, 2021December 31, 2020
Fair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
(In Millions)
Less than 12 months$206.9 $1.4 $36.4 $0.5 
More than 12 months42.9 1.9 0.8 — 
Total$249.8 $3.3 $37.2 $0.5 
System Energy [Member]  
Securities Held The available-for-sale securities held as of December 31, 2021 and 2020 are summarized as follows:
 Fair ValueTotal Unrealized GainsTotal Unrealized Losses
 (In Millions)
2021
Debt Securities$524.5 $11.8 $2.9 
2020
Debt Securities$427.7 $30.0 $0.8 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of December 31, 2021 and 2020 are as follows:
 20212020
 (In Millions)
Less than 1 year$— ($1.1)
1 year - 5 years156.8 134.7 
5 years - 10 years161.8 141.5 
10 years - 15 years58.6 31.5 
15 years - 20 years1.9 5.3 
20 years+145.4 115.8 
Total$524.5 $427.7 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
The fair value and gross unrealized losses of available-for-sale debt securities, summarized by length of time that the securities had been in a continuous loss position, were as follows as of December 31, 2021 and 2020:
December 31, 2021December 31, 2020
Fair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
(In Millions)
Less than 12 months$276.6 $2.3 $28.9 $0.8 
More than 12 months11.3 0.6 — — 
Total$287.9 $2.9 $28.9 $0.8