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Decommissioning Trust Funds (Tables)
 3 Months Ended
Mar. 31, 2026
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 March 31, 2026 and December 31, 2025:
20262025
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$991 $14 $361 $3 
More than 12 months502 46 549 42 
Total$1,493 $60 $910 $45 
Investments Classified by Contractual Maturity Date [Table Text Block]
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of March 31, 2026 and December 31, 2025 were as follows:
20262025
(In Millions)
Less than 1 year$27 $31 
1 year - 5 years611 649 
5 years - 10 years744 645 
10 years - 15 years278 188 
15 years - 20 years284 218 
20 years+466 471 
Total$2,410 $2,202 
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 months ended March 31, 2026 and 2025:
 20262025
 (In Millions)
Proceeds from disposition of securities$159 $262 
Realized gains$1 $1 
Realized losses$2 $4 
Debt Securities, Available-for-Sale
The available-for-sale debt securities held as of March 31, 2026 and December 31, 2025 are summarized as follows:
20262025
(In Millions)
Fair value$2,410 $2,202 
Unrealized gains$15 $28 
Unrealized losses$60 $45 
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 March 31, 2026 and December 31, 2025:
20262025
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$233.3 $3.7 $89.1 $0.6 
More than 12 months191.7 15.1 211.1 13.6 
Total$425.0 $18.8 $300.2 $14.2 
Investments Classified by Contractual Maturity Date [Table Text Block]
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of March 31, 2026 and December 31, 2025 were as follows:
 20262025
 (In Millions)
Less than 1 year$22.6 $27.7 
1 year - 5 years144.5 140.2 
5 years - 10 years278.8 256.8 
10 years - 15 years99.0 69.1 
15 years - 20 years78.4 61.4 
20 years+63.3 58.8 
Total$686.6 $614.0 
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 months ended March 31, 2026 and 2025:
 20262025
 (In Millions)
Proceeds from disposition of securities$3.8 $— 
Realized gains$— $— 
Realized losses$0.1 $— 
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of March 31, 2026 and December 31, 2025 are summarized as follows:
20262025
(In Millions)
Fair value$686.6 $614.0 
Unrealized gains$4.1 $7.5 
Unrealized losses$18.8 $14.2 
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 March 31, 2026 and December 31, 2025:
20262025
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$449.9 $5.4 $179.8 $1.6 
More than 12 months176.6 14.9 196.6 13.4 
Total$626.5 $20.3 $376.4 $15.0 
Investments Classified by Contractual Maturity Date [Table Text Block]
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of March 31, 2026 and December 31, 2025 were as follows:
20262025
(In Millions)
Less than 1 year$1.5 $0.9 
1 year - 5 years246.2 259.0 
5 years - 10 years237.2 227.7 
10 years - 15 years129.8 93.6 
15 years - 20 years152.2 110.9 
20 years+278.9 300.5 
Total$1,045.8 $992.6 
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 months ended March 31, 2026 and 2025:
 20262025
 (In Millions)
Proceeds from disposition of securities$75.7 $110.0 
Realized gains$0.4 $0.1 
Realized losses$1.5 $1.5 
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of March 31, 2026 and December 31, 2025 are summarized as follows:
20262025
(In Millions)
Fair value$1,045.8 $992.6 
Unrealized gains$6.9 $13.0 
Unrealized losses$20.3 $15.0 
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 March 31, 2026 and December 31, 2025:
20262025
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$307.5 $5.1 $91.9 $1.1 
More than 12 months134.2 16.3 141.7 15.1 
Total$441.7 $21.4 $233.6 $16.2 
Investments Classified by Contractual Maturity Date [Table Text Block]
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of March 31, 2026 and December 31, 2025 were as follows:
20262025
(In Millions)
Less than 1 year$2.6 $2.2 
1 year - 5 years220.5 249.8 
5 years - 10 years227.6 160.3 
10 years - 15 years48.8 25.5 
15 years - 20 years53.4 46.2 
20 years+125.1 111.0 
Total$678.0 $595.0 
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 months ended March 31, 2026 and 2025:
 20262025
 (In Millions)
Proceeds from disposition of securities$79.0 $152.3 
Realized gains$0.3 $0.6 
Realized losses$0.7 $2.7 
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of March 31, 2026 and December 31, 2025 are summarized as follows:
20262025
(In Millions)
Fair value$678.0 $595.0 
Unrealized gains$3.7 $7.4 
Unrealized losses$21.4 $16.2