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Decommissioning Trust Funds (Tables)
 9 Months Ended
Sep. 30, 2024
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]
The available-for-sale securities held as of September 30, 2024 and December 31, 2023 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2024
Debt Securities$2,051 $36 $94 
2023
Debt Securities$1,770 $19 $134 
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, 2024 and December 31, 2023:
September 30, 2024December 31, 2023
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$105 $1 $134 $6 
More than 12 months871 93 999 128 
Total$976 $94 $1,133 $134 
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, 2024 and December 31, 2023 were as follows:
20242023
(In Millions)
Less than 1 year$52 $82 
1 year - 5 years627 517 
5 years - 10 years604 504 
10 years - 15 years138 121 
15 years - 20 years209 179 
20 years+421 367 
Total$2,051 $1,770 
Entergy Arkansas [Member]  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] The available-for-sale securities held as of September 30, 2024 and December 31, 2023 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2024
Debt Securities$597.5 $7.5 $42.3 
2023
Debt Securities$496.9 $2.4 $53.6 
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 September 30, 2024 and December 31, 2023:
September 30, 2024December 31, 2023
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$17.5 $0.2 $22.5 $0.4 
More than 12 months376.5 42.1 403.4 53.2 
Total$394.0 $42.3 $425.9 $53.6 
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, 2024 and December 31, 2023 were as follows:
 20242023
 (In Millions)
Less than 1 year$42.5 $45.3 
1 year - 5 years156.2 132.2 
5 years - 10 years248.5 205.7 
10 years - 15 years38.4 39.9 
15 years - 20 years63.8 49.6 
20 years+48.1 24.2 
Total$597.5 $496.9 
Entergy Louisiana [Member]  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] The available-for-sale securities held as of September 30, 2024 and December 31, 2023 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2024
Debt Securities$877.6 $16.6 $25.0 
2023
Debt Securities$788.1 $11.7 $37.4 
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, 2024 and December 31, 2023:
September 30, 2024December 31, 2023
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$48.1 $0.1 $69.8 $0.9 
More than 12 months299.6 24.9 356.1 36.5 
Total$347.7 $25.0 $425.9 $37.4 
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, 2024 and December 31, 2023 were as follows:
20242023
(In Millions)
Less than 1 year$7.1 $31.4 
1 year - 5 years215.0 181.6 
5 years - 10 years199.3 170.0 
10 years - 15 years86.1 70.2 
15 years - 20 years95.3 90.2 
20 years+274.8 244.7 
Total$877.6 $788.1 
System Energy [Member]  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] The available-for-sale securities held as of September 30, 2024 and December 31, 2023 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2024
Debt Securities$575.9 $12.3 $26.6 
2023
Debt Securities$485.2 $4.5 $42.5 
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, 2024 and December 31, 2023:
September 30, 2024December 31, 2023
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$39.9 $0.2 $42.1 $4.5 
More than 12 months194.8 26.4 239.1 38.0 
Total$234.7 $26.6 $281.2 $42.5 
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, 2024 and December 31, 2023 were as follows:
20242023
(In Millions)
Less than 1 year$2.7 $5.3 
1 year - 5 years255.6 203.4 
5 years - 10 years156.4 128.6 
10 years - 15 years13.1 10.7 
15 years - 20 years49.9 38.8 
20 years+98.2 98.4 
Total$575.9 $485.2