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Decommissioning Trust Funds (Tables)
 6 Months Ended
Jun. 30, 2021
Securities Held
The available-for-sale securities held as of June 30, 2021 and December 31, 2020 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2021
Debt Securities$2,038 $92 $8 
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 June 30, 2021 and December 31, 2020:
June 30, 2021December 31, 2020
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$482 $8 $187 $3 
More than 12 months3 — 2 — 
Total$485 $8 $189 $3 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of June 30, 2021 and December 31, 2020 were as follows:
20212020
(In Millions)
Less than 1 year$— ($4)
1 year - 5 years455 672 
5 years - 10 years663 852 
10 years - 15 years335 377 
15 years - 20 years117 144 
20 years+468 576 
Total$2,038 $2,617 
Entergy Arkansas [Member]  
Securities Held The available-for-sale securities held as of June 30, 2021 and December 31, 2020 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2021
Debt Securities$472.5 $16.7 $2.7 
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 June 30, 2021 and December 31, 2020:
June 30, 2021December 31, 2020
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$127.7 $2.7 $29.9 $0.3 
More than 12 months2.0 — — — 
Total$129.7 $2.7 $29.9 $0.3 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of June 30, 2021 and December 31, 2020 were as follows:
 20212020
 (In Millions)
Less than 1 year$— $— 
1 year - 5 years93.6 113.1 
5 years - 10 years191.6 189.8 
10 years - 15 years121.5 81.4 
15 years - 20 years28.8 28.5 
20 years+37.0 35.1 
Total$472.5 $447.9 
Entergy Louisiana [Member]  
Securities Held The available-for-sale securities held as of June 30, 2021 and December 31, 2020 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2021
Debt Securities$697.5 $38.4 $1.9 
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 June 30, 2021 and December 31, 2020:
June 30, 2021December 31, 2020
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$124.4 $1.9 $36.4 $0.5 
More than 12 months0.7 — 0.8 — 
Total$125.1 $1.9 $37.2 $0.5 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of June 30, 2021 and December 31, 2020 were as follows:
20212020
(In Millions)
Less than 1 year$— $— 
1 year - 5 years122.7 117.0 
5 years - 10 years188.4 159.4 
10 years - 15 years103.5 101.2 
15 years - 20 years74.3 66.9 
20 years+208.6 187.7 
Total$697.5 $632.2 
System Energy [Member]  
Securities Held The available-for-sale securities held as of June 30, 2021 and December 31, 2020 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2021
Debt Securities$467.8 $19.4 $2.5 
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 June 30, 2021 and December 31, 2020:
June 30, 2021December 31, 2020
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$149.1 $2.5 $28.9 $0.8 
More than 12 months0.1 — — — 
Total$149.2 $2.5 $28.9 $0.8 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of June 30, 2021 and December 31, 2020 were as follows:
20212020
(In Millions)
Less than 1 year$— ($1.1)
1 year - 5 years144.0 134.7 
5 years - 10 years147.3 141.5 
10 years - 15 years46.3 31.5 
15 years - 20 years2.8 5.3 
20 years+127.4 115.8 
Total$467.8 $427.7