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Decommissioning Trust Funds (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2025 and December 31, 2024:
20252024
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$638 $14 $1,102 $24 
More than 12 months469 48 510 56 
Total$1,107 $62 $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 March 31, 2025 and December 31, 2024 were as follows:
20252024
(In Millions)
Less than 1 year$29 $36 
1 year - 5 years551 574 
5 years - 10 years639 629 
10 years - 15 years205 166 
15 years - 20 years216 218 
20 years+451 424 
Total$2,091 $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 months ended March 31, 2025 and 2024:
 20252024
 (In Millions)
Proceeds from disposition of securities$262 $169 
Realized gains$1 $— 
Realized losses$4 $7 
Debt Securities, Available-for-Sale
The available-for-sale debt securities held as of March 31, 2025 and December 31, 2024 are summarized as follows:
20252024
(In Millions)
Fair value$2,091 $2,047 
Unrealized gains$15 $7 
Unrealized losses$62 $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 March 31, 2025 and December 31, 2024:
20252024
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$158.4 $3.9 $282.8 $8.2 
More than 12 months183.0 14.2 195.0 17.6 
Total$341.4 $18.1 $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 March 31, 2025 and December 31, 2024 were as follows:
 20252024
 (In Millions)
Less than 1 year$25.2 $31.7 
1 year - 5 years144.0 142.5 
5 years - 10 years234.8 231.0 
10 years - 15 years71.2 62.2 
15 years - 20 years64.2 62.8 
20 years+50.7 48.8 
Total$590.1 $579.0 
Schedule of Realized Gain (Loss)
The following table summarizes proceeds from the dispositions of available-for-sale debt securities and the related gains and losses from the sales during the three months ended March 31, 2025 and 2024:
 20252024
 (In Millions)
Proceeds from disposition of securities$— $12.4 
Realized gains$— $— 
Realized losses$— $0.4 
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of March 31, 2025 and December 31, 2024 are summarized as follows:
20252024
(In Millions)
Fair value$590.1 $579.0 
Unrealized gains$4.0 $1.2 
Unrealized losses$18.1 $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 March 31, 2025 and December 31, 2024:
20252024
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$324.8 $6.7 $543.8 $8.8 
More than 12 months165.0 16.4 178.4 18.1 
Total$489.8 $23.1 $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 March 31, 2025 and December 31, 2024 were as follows:
20252024
(In Millions)
Less than 1 year$3.7 $4.4 
1 year - 5 years221.2 188.2 
5 years - 10 years212.0 259.4 
10 years - 15 years97.4 80.9 
15 years - 20 years103.6 106.1 
20 years+288.2 269.1 
Total$926.1 $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 months ended March 31, 2025 and 2024:
 20252024
 (In Millions)
Proceeds from disposition of securities$110.0 $48.4 
Realized gains$0.1 $0.2 
Realized losses$1.5 $2.9 
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of March 31, 2025 and December 31, 2024 are summarized as follows:
20252024
(In Millions)
Fair value$926.1 $908.1 
Unrealized gains$6.3 $3.6 
Unrealized losses$23.1 $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 March 31, 2025 and December 31, 2024:
20252024
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$154.4 $2.9 $275.6 $6.8 
More than 12 months120.6 17.7 136.8 20.8 
Total$275.0 $20.6 $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 March 31, 2025 and December 31, 2024 were as follows:
20252024
(In Millions)
Less than 1 year$0.2 $0.2 
1 year - 5 years185.8 243.7 
5 years - 10 years192.4 138.9 
10 years - 15 years36.2 22.7 
15 years - 20 years48.6 49.4 
20 years+111.7 104.9 
Total$574.9 $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 months ended March 31, 2025 and 2024:
 20252024
 (In Millions)
Proceeds from disposition of securities$152.3 $108.0 
Realized gains$0.6 $0.2 
Realized losses$2.7 $3.5 
Debt Securities, Available-for-Sale The available-for-sale debt securities held as of March 31, 2025 and December 31, 2024 are summarized as follows:
20252024
(In Millions)
Fair value$574.9 $559.8 
Unrealized gains$4.7 $1.9 
Unrealized losses$20.6 $27.6