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Decommissioning Trust Funds (Tables)
 12 Months Ended
Dec. 31, 2025
Debt Securities, Available-for-Sale
The available-for-sale debt securities held as of December 31, 2025 and 2024 are summarized as follows:
20252024
(In Millions)
Fair value$2,202 $2,047 
Unrealized gains$28 $7 
Unrealized losses$45 $80 
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]
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, 2025 and 2024:
20252024
Fair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
 (In Millions)
Less than 12 months$361 $3 $1,102 $24 
More than 12 months549 42 510 56 
Total$910 $45 $1,612 $80 
Investments Classified by Contractual Maturity Date [Table Text Block]
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of December 31, 2025 and 2024 are as follows:
 20252024
 (In Millions)
Less than 1 year$31 $36 
1 year - 5 years649 574 
5 years - 10 years645 629 
10 years - 15 years188 166 
15 years - 20 years218 218 
20 years+471 424 
Total$2,202 $2,047 
Schedule of Realized Gain (Loss)
The following table summarizes proceeds from the dispositions of available-for-sale debt securities and the related gains and losses from the sales for the years ended December 31, 2025, 2024, and 2023:
 202520242023
 (In Millions)
Proceeds from disposition of securities$902 $1,258 $661 
Realized gains$6 $5 $1 
Realized losses$13 $89 $37 
Entergy Arkansas [Member]  
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of December 31, 2025 and 2024 are summarized as follows:
20252024
(In Millions)
Fair value$614.0 $579.0 
Unrealized gains$7.5 $1.2 
Unrealized losses$14.2 $25.8 
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]
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, 2025 and 2024:
20252024
Fair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
(In Millions)
Less than 12 months$89.1 $0.6 $282.8 $8.2 
More than 12 months211.1 13.6 195.0 17.6 
Total$300.2 $14.2 $477.8 $25.8 
Investments Classified by Contractual Maturity Date [Table Text Block]
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of December 31, 2025 and 2024 are as follows:
 20252024
 (In Millions)
Less than 1 year$27.7 $31.7 
1 year - 5 years140.2 142.5 
5 years - 10 years256.8 231.0 
10 years - 15 years69.1 62.2 
15 years - 20 years61.4 62.8 
20 years+58.8 48.8 
Total$614.0 $579.0 
Schedule of Realized Gain (Loss)
The following table summarizes proceeds from the dispositions of available-for-sale debt securities and the related gains and losses from the sales for the years ended December 31, 2025, 2024, and 2023:
 202520242023
 (In Millions)
Proceeds from disposition of securities$41.7 $210.6 $28.5 
Realized gains$0.5 $0.1 $0.1 
Realized losses$0.1 $35.8 $2.0 
Entergy Louisiana [Member]  
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of December 31, 2025 and 2024 are summarized as follows:
20252024
(In Millions)
Fair value$992.6 $908.1 
Unrealized gains$13.0 $3.6 
Unrealized losses$15.0 $26.9 
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]
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, 2025 and 2024:
20252024
Fair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
(In Millions)
Less than 12 months$179.8 $1.6 $543.8 $8.8 
More than 12 months196.6 13.4 178.4 18.1 
Total$376.4 $15.0 $722.2 $26.9 
Investments Classified by Contractual Maturity Date [Table Text Block]
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of December 31, 2025 and 2024 are as follows:
 20252024
 (In Millions)
Less than 1 year$0.9 $4.4 
1 year - 5 years259.0 188.2 
5 years - 10 years227.7 259.4 
10 years - 15 years93.6 80.9 
15 years - 20 years110.9 106.1 
20 years+300.5 269.1 
Total$992.6 $908.1 
Schedule of Realized Gain (Loss)
The following table summarizes proceeds from the dispositions of available-for-sale debt securities and the related gains and losses from the sales for the years ended December 31, 2025, 2024, and 2023:
 202520242023
 (In Millions)
Proceeds from disposition of securities$398.8 $547.8 $318.6 
Realized gains$2.2 $1.3 $0.5 
Realized losses$7.0 $25.8 $20.9 
System Energy [Member]  
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of December 31, 2025 and 2024 are summarized as follows:
20252024
(In Millions)
Fair value$595.0 $559.8 
Unrealized gains$7.4 $1.9 
Unrealized losses$16.2 $27.6 
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]
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, 2025 and 2024:
20252024
Fair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
(In Millions)
Less than 12 months$91.9 $1.1 $275.6 $6.8 
More than 12 months141.7 15.1 136.8 20.8 
Total$233.6 $16.2 $412.4 $27.6 
Investments Classified by Contractual Maturity Date [Table Text Block]
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of December 31, 2025 and 2024 are as follows:
 20252024
 (In Millions)
Less than 1 year$2.2 $0.2 
1 year - 5 years249.8 243.7 
5 years - 10 years160.3 138.9 
10 years - 15 years25.5 22.7 
15 years - 20 years46.2 49.4 
20 years+111.0 104.9 
Total$595.0 $559.8 
Schedule of Realized Gain (Loss)
The following table summarizes proceeds from the dispositions of available-for-sale debt securities and the related gains and losses from the sales for the years ended December 31, 2025, 2024, and 2023:
 202520242023
 (In Millions)
Proceeds from disposition of securities$461.8 $500.1 $314.3 
Realized gains$3.4 $3.1 $0.6 
Realized losses$5.8 $28.0 $14.2