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Decommissioning Trust Funds (Tables)
 6 Months Ended
Jun. 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 June 30, 2025 and December 31, 2024:
20252024
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$565 $17 $1,102 $24 
More than 12 months438 43 510 56 
Total$1,003 $60 $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 June 30, 2025 and December 31, 2024 were as follows:
20252024
(In Millions)
Less than 1 year$29 $36 
1 year - 5 years541 574 
5 years - 10 years672 629 
10 years - 15 years195 166 
15 years - 20 years197 218 
20 years+473 424 
Total$2,107 $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 six months ended June 30, 2025 and 2024:
Three Months EndedSix Months Ended
 2025202420252024
 (In Millions)
Proceeds from disposition of securities$227 $161 $489 $330 
Realized gains$1 $— $2 $1 
Realized losses$4 $14 $8 $20 
Debt Securities, Available-for-Sale
The available-for-sale debt securities held as of June 30, 2025 and December 31, 2024 are summarized as follows:
20252024
(In Millions)
Fair value$2,107 $2,047 
Unrealized gains$20 $7 
Unrealized losses$60 $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 June 30, 2025 and December 31, 2024:
20252024
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$141.8 $4.6 $282.8 $8.2 
More than 12 months174.0 12.9 195.0 17.6 
Total$315.8 $17.5 $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 June 30, 2025 and December 31, 2024 were as follows:
 20252024
 (In Millions)
Less than 1 year$26.3 $31.7 
1 year - 5 years159.2 142.5 
5 years - 10 years251.7 231.0 
10 years - 15 years37.4 62.2 
15 years - 20 years43.1 62.8 
20 years+76.4 48.8 
Total$594.1 $579.0 
Schedule of Realized Gain (Loss)
The following table summarizes proceeds from the dispositions of available-for-sale debt securities and the related gains and losses from the sales during the three and six months ended June 30, 2025 and 2024:
Three Months EndedSix Months Ended
 2025202420252024
 (In Millions)
Proceeds from disposition of securities$— $5.5 $— $17.9 
Realized gains$— $0.1 $— $0.1 
Realized losses$— $0.4 $— $0.9 
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of June 30, 2025 and December 31, 2024 are summarized as follows:
20252024
(In Millions)
Fair value$594.1 $579.0 
Unrealized gains$5.4 $1.2 
Unrealized losses$17.5 $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 June 30, 2025 and December 31, 2024:
20252024
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$318.7 $9.4 $543.8 $8.8 
More than 12 months150.6 14.7 178.4 18.1 
Total$469.3 $24.1 $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 June 30, 2025 and December 31, 2024 were as follows:
20252024
(In Millions)
Less than 1 year$2.4 $4.4 
1 year - 5 years212.3 188.2 
5 years - 10 years214.3 259.4 
10 years - 15 years115.0 80.9 
15 years - 20 years107.6 106.1 
20 years+279.7 269.1 
Total$931.3 $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 six months ended June 30, 2025 and 2024:
Three Months EndedSix Months Ended
 2025202420252024
 (In Millions)
Proceeds from disposition of securities$71.5 $62.5 $181.5 $110.9 
Realized gains$0.1 $0.1 $0.2 $0.2 
Realized losses$2.4 $4.8 $4.0 $7.7 
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of June 30, 2025 and December 31, 2024 are summarized as follows:
20252024
(In Millions)
Fair value$931.3 $908.1 
Unrealized gains$8.1 $3.6 
Unrealized losses$24.1 $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 June 30, 2025 and December 31, 2024:
20252024
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$104.2 $3.3 $275.6 $6.8 
More than 12 months113.8 15.7 136.8 20.8 
Total$218.0 $19.0 $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 June 30, 2025 and December 31, 2024 were as follows:
20252024
(In Millions)
Less than 1 year$0.2 $0.2 
1 year - 5 years169.2 243.7 
5 years - 10 years206.4 138.9 
10 years - 15 years42.5 22.7 
15 years - 20 years46.4 49.4 
20 years+117.4 104.9 
Total$582.1 $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 six months ended June 30, 2025 and 2024:
Three Months EndedSix Months Ended
 2025202420252024
 (In Millions)
Proceeds from disposition of securities$155.3 $93.5 $307.6 $201.5 
Realized gains$0.8 $— $1.3 $0.2 
Realized losses$1.4 $8.4 $4.0 $11.9 
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of June 30, 2025 and December 31, 2024 are summarized as follows:
20252024
(In Millions)
Fair value$582.1 $559.8 
Unrealized gains$6.1 $1.9 
Unrealized losses$19.0 $27.6