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Decommissioning Trust Funds (Tables)
 9 Months Ended
Sep. 30, 2025
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 September 30, 2025 and December 31, 2024:
20252024
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$273 $4 $1,102 $24 
More than 12 months553 42 510 56 
Total$826 $46 $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 September 30, 2025 and December 31, 2024 were as follows:
20252024
(In Millions)
Less than 1 year$33 $36 
1 year - 5 years639 574 
5 years - 10 years659 629 
10 years - 15 years142 166 
15 years - 20 years210 218 
20 years+472 424 
Total$2,155 $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 during the three and nine months ended September 30, 2025 and 2024:
Three Months EndedNine Months Ended
 2025202420252024
 (In Millions)
Proceeds from disposition of securities$223 $173 $712 $504 
Realized gains$2 $3 $4 $3 
Realized losses$3 $5 $11 $26 
Debt Securities, Available-for-Sale
The available-for-sale debt securities held as of September 30, 2025 and December 31, 2024 are summarized as follows:
20252024
(In Millions)
Fair value$2,155 $2,047 
Unrealized gains$28 $7 
Unrealized losses$46 $80 
Entergy Arkansas [Member]  
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 September 30, 2025 and December 31, 2024:
20252024
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$49.6 $0.6 $282.8 $8.2 
More than 12 months224.7 13.5 195.0 17.6 
Total$274.3 $14.1 $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 September 30, 2025 and December 31, 2024 were as follows:
 20252024
 (In Millions)
Less than 1 year$24.1 $31.7 
1 year - 5 years150.6 142.5 
5 years - 10 years263.4 231.0 
10 years - 15 years45.5 62.2 
15 years - 20 years52.8 62.8 
20 years+72.9 48.8 
Total$609.3 $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 during the three and nine months ended September 30, 2025 and 2024:
Three Months EndedNine Months Ended
 2025202420252024
 (In Millions)
Proceeds from disposition of securities$15.0 $4.2 $15.0 $22.1 
Realized gains$0.1 $— $0.1 $0.1 
Realized losses$0.1 $0.3 $0.1 $1.2 
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of September 30, 2025 and December 31, 2024 are summarized as follows:
20252024
(In Millions)
Fair value$609.3 $579.0 
Unrealized gains$7.6 $1.2 
Unrealized losses$14.1 $25.8 
Entergy Louisiana [Member]  
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 September 30, 2025 and December 31, 2024:
20252024
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$154.5 $3.2 $543.8 $8.8 
More than 12 months177.5 12.8 178.4 18.1 
Total$332.0 $16.0 $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 September 30, 2025 and December 31, 2024 were as follows:
20252024
(In Millions)
Less than 1 year$2.6 $4.4 
1 year - 5 years230.3 188.2 
5 years - 10 years235.9 259.4 
10 years - 15 years75.8 80.9 
15 years - 20 years111.2 106.1 
20 years+295.6 269.1 
Total$951.4 $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 during the three and nine months ended September 30, 2025 and 2024:
Three Months EndedNine Months Ended
 2025202420252024
 (In Millions)
Proceeds from disposition of securities$120.8 $51.9 $302.3 $162.8 
Realized gains$1.0 $0.5 $1.2 $0.7 
Realized losses$1.9 $1.5 $5.9 $9.2 
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of September 30, 2025 and December 31, 2024 are summarized as follows:
20252024
(In Millions)
Fair value$951.4 $908.1 
Unrealized gains$12.6 $3.6 
Unrealized losses$16.0 $26.9 
System Energy [Member]  
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 September 30, 2025 and December 31, 2024:
20252024
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$68.7 $0.6 $275.6 $6.8 
More than 12 months150.9 15.6 136.8 20.8 
Total$219.6 $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 September 30, 2025 and December 31, 2024 were as follows:
20252024
(In Millions)
Less than 1 year$6.0 $0.2 
1 year - 5 years258.2 243.7 
5 years - 10 years159.2 138.9 
10 years - 15 years20.3 22.7 
15 years - 20 years46.1 49.4 
20 years+104.8 104.9 
Total$594.6 $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 during the three and nine months ended September 30, 2025 and 2024:
Three Months EndedNine Months Ended
 2025202420252024
 (In Millions)
Proceeds from disposition of securities$87.3 $117.3 $394.9 $318.8 
Realized gains$1.2 $2.2 $2.6 $2.4 
Realized losses$0.6 $3.3 $4.6 $15.2 
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of September 30, 2025 and December 31, 2024 are summarized as follows:
20252024
(In Millions)
Fair value$594.6 $559.8 
Unrealized gains$8.1 $1.9 
Unrealized losses$16.2 $27.6