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Decommissioning Trust Funds (Tables)
 3 Months Ended
Mar. 31, 2021
Securities Held
The available-for-sale securities held as of March 31, 2021 and December 31, 2020 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2021
Debt Securities$3,436 $102 $43 
2020
Debt Securities$2,617 $197 $3 
Available For Sale Securities Continuous 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 March 31, 2021 and December 31, 2020:
March 31, 2021December 31, 2020
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$1,748 $43 $187 $3 
More than 12 months3 — 2 — 
Total$1,751 $43 $189 $3 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of March 31, 2021 and December 31, 2020 were as follows:
20212020
(In Millions)
Less than 1 year$— ($4)
1 year - 5 years1,027 672 
5 years - 10 years1,257 852 
10 years - 15 years492 377 
15 years - 20 years128 144 
20 years+532 576 
Total$3,436 $2,617 
Entergy Arkansas [Member]  
Securities Held The available-for-sale securities held as of March 31, 2021 and December 31, 2020 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2021
Debt Securities$425.9 $13.2 $6.8 
2020
Debt Securities$447.9 $27.7 $0.3 
Available For Sale Securities Continuous 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 March 31, 2021 and December 31, 2020:
March 31, 2021December 31, 2020
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$139.1 $6.8 $29.9 $0.3 
More than 12 months— — — — 
Total$139.1 $6.8 $29.9 $0.3 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of March 31, 2021 and December 31, 2020 were as follows:
 20212020
 (In Millions)
Less than 1 year$— $— 
1 year - 5 years84.7 113.1 
5 years - 10 years179.2 189.8 
10 years - 15 years100.8 81.4 
15 years - 20 years26.7 28.5 
20 years+34.5 35.1 
Total$425.9 $447.9 
Entergy Louisiana [Member]  
Securities Held The available-for-sale securities held as of March 31, 2021 and December 31, 2020 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2021
Debt Securities$632.8 $31.2 $4.6 
2020
Debt Securities$632.2 $51.3 $0.5 
Available For Sale Securities Continuous 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 March 31, 2021 and December 31, 2020:
March 31, 2021December 31, 2020
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$171.7 $4.6 $36.4 $0.5 
More than 12 months2.3 — 0.8 — 
Total$174.0 $4.6 $37.2 $0.5 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of March 31, 2021 and December 31, 2020 were as follows:
20212020
(In Millions)
Less than 1 year$— $— 
1 year - 5 years89.3 117.0 
5 years - 10 years186.0 159.4 
10 years - 15 years113.7 101.2 
15 years - 20 years63.4 66.9 
20 years+180.4 187.7 
Total$632.8 $632.2 
System Energy [Member]  
Securities Held The available-for-sale securities held as of March 31, 2021 and December 31, 2020 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2021
Debt Securities$406.4 $14.3 $5.0 
2020
Debt Securities$427.7 $30.0 $0.8 
Available For Sale Securities Continuous 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 March 31, 2021 and December 31, 2020:
March 31, 2021December 31, 2020
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$157.5 $5.0 $28.9 $0.8 
More than 12 months— — — — 
Total$157.5 $5.0 $28.9 $0.8 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of March 31, 2021 and December 31, 2020 were as follows:
20212020
(In Millions)
Less than 1 year$— ($1.1)
1 year - 5 years136.2 134.7 
5 years - 10 years120.4 141.5 
10 years - 15 years35.1 31.5 
15 years - 20 years4.5 5.3 
20 years+110.2 115.8 
Total$406.4 $427.7