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Decommissioning Trust Funds (Tables)
 9 Months Ended
Sep. 30, 2021
Securities Held
The available-for-sale securities held as of September 30, 2021 and December 31, 2020 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2021
Debt Securities$2,055 $74 $10 
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 September 30, 2021 and December 31, 2020:
September 30, 2021December 31, 2020
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$650 $9 $187 $3 
More than 12 months35 1 2 — 
Total$685 $10 $189 $3 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of September 30, 2021 and December 31, 2020 were as follows:
20212020
(In Millions)
Less than 1 year$— ($4)
1 year - 5 years431 672 
5 years - 10 years679 852 
10 years - 15 years346 377 
15 years - 20 years122 144 
20 years+477 576 
Total$2,055 $2,617 
Entergy Arkansas [Member]  
Securities Held The available-for-sale securities held as of September 30, 2021 and December 31, 2020 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2021
Debt Securities$477.9 $13.3 $3.4 
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 September 30, 2021 and December 31, 2020:
September 30, 2021December 31, 2020
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$171.1 $2.6 $29.9 $0.3 
More than 12 months17.5 0.8 — — 
Total$188.6 $3.4 $29.9 $0.3 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of September 30, 2021 and December 31, 2020 were as follows:
 20212020
 (In Millions)
Less than 1 year$— $— 
1 year - 5 years74.2 113.1 
5 years - 10 years207.3 189.8 
10 years - 15 years131.6 81.4 
15 years - 20 years31.3 28.5 
20 years+33.5 35.1 
Total$477.9 $447.9 
Entergy Louisiana [Member]  
Securities Held The available-for-sale securities held as of September 30, 2021 and December 31, 2020 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2021
Debt Securities$705.8 $33.1 $3.3 
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 September 30, 2021 and December 31, 2020:
September 30, 2021December 31, 2020
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$173.2 $2.6 $36.4 $0.5 
More than 12 months15.0 0.7 0.8 — 
Total$188.2 $3.3 $37.2 $0.5 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of September 30, 2021 and December 31, 2020 were as follows:
20212020
(In Millions)
Less than 1 year$— $— 
1 year - 5 years117.0 117.0 
5 years - 10 years191.0 159.4 
10 years - 15 years109.5 101.2 
15 years - 20 years77.6 66.9 
20 years+210.7 187.7 
Total$705.8 $632.2 
System Energy [Member]  
Securities Held The available-for-sale securities held as of September 30, 2021 and December 31, 2020 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2021
Debt Securities$468.0 $12.5 $2.4 
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 September 30, 2021 and December 31, 2020:
September 30, 2021December 31, 2020
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$200.6 $2.4 $28.9 $0.8 
More than 12 months1.4 — — — 
Total$202.0 $2.4 $28.9 $0.8 
Fair Value Of Debt Securities By Contractual Maturities
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of September 30, 2021 and December 31, 2020 were as follows:
20212020
(In Millions)
Less than 1 year$— ($1.1)
1 year - 5 years149.2 134.7 
5 years - 10 years147.0 141.5 
10 years - 15 years40.2 31.5 
15 years - 20 years1.2 5.3 
20 years+130.4 115.8 
Total$468.0 $427.7