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Decommissioning Trust Funds (Tables)
 9 Months Ended
Sep. 30, 2020
Securities Held
The available-for-sale securities held as of September 30, 2020 and December 31, 2019 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2020
Debt Securities (a)$2,581 $201 $2 
2019
Debt Securities (a)$2,456 $96 $6 
(a)Debt securities presented herein do not include the $546 million and $507 million of debt securities held in the wholly-owned registered investment company as of September 30, 2020 and December 31, 2019, respectively, which are not accounted for as available-for-sale.
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, 2020 and December 31, 2019:
September 30, 2020December 31, 2019
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$206 $2 $404 $5 
More than 12 months2 — 38 1 
Total$208 $2 $442 $6 
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, 2020 and December 31, 2019 were as follows:
20202019
(In Millions)
Less than 1 year$24 $128 
1 year - 5 years718 807 
5 years - 10 years761 666 
10 years - 15 years347 125 
15 years - 20 years135 126 
20 years+596 604 
Total$2,581 $2,456 
Entergy Arkansas [Member]  
Securities Held The available-for-sale securities held as of September 30, 2020 and December 31, 2019 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2020
Debt Securities$433.2 $29.5 $0.2 
2019
Debt Securities$412.8 $9.9 $2.6 
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, 2020 and December 31, 2019:
September 30, 2020December 31, 2019
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$26.8 $0.2 $104.8 $2.5 
More than 12 months— — 7.7 0.1 
Total$26.8 $0.2 $112.5 $2.6 
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, 2020 and December 31, 2019 were as follows:
 20202019
 (In Millions)
Less than 1 year$13.6 $44.1 
1 year - 5 years102.0 109.1 
5 years - 10 years177.5 156.0 
10 years - 15 years75.8 31.3 
15 years - 20 years26.7 23.8 
20 years+37.6 48.5 
Total$433.2 $412.8 
Entergy Louisiana [Member]  
Securities Held The available-for-sale securities held as of September 30, 2020 and December 31, 2019 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2020
Debt Securities$626.4 $50.5 $0.5 
2019
Debt Securities$601.5 $29.3 $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, 2020 and December 31, 2019:
September 30, 2020December 31, 2019
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$43.7 $0.5 $71.2 $0.8 
More than 12 months0.8 — 7.9 — 
Total$44.5 $0.5 $79.1 $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, 2020 and December 31, 2019 were as follows:
20202019
(In Millions)
Less than 1 year$7.7 $40.7 
1 year - 5 years122.9 142.0 
5 years - 10 years147.8 132.4 
10 years - 15 years95.1 39.8 
15 years - 20 years61.8 49.2 
20 years+191.1 197.4 
Total$626.4 $601.5 
System Energy [Member]  
Securities Held The available-for-sale securities held as of September 30, 2020 and December 31, 2019 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2020
Debt Securities$420.8 $31.6 $0.4 
2019
Debt Securities$386.2 $15.1 $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, 2020 and December 31, 2019:
September 30, 2020December 31, 2019
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$28.7 $0.4 $56.9 $0.3 
More than 12 months— — 0.3 — 
Total$28.7 $0.4 $57.2 $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, 2020 and December 31, 2019 were as follows:
20202019
(In Millions)
Less than 1 year($1.6)$8.5 
1 year - 5 years163.1 154.6 
5 years - 10 years107.0 92.3 
10 years - 15 years27.5 13.4 
15 years - 20 years4.9 14.4 
20 years+119.9 103.0 
Total$420.8 $386.2