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Decommissioning Trust Funds (Tables)
 3 Months Ended
Mar. 31, 2024
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]
The available-for-sale securities held as of March 31, 2024 and December 31, 2023 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2024
Debt Securities$1,761 $10 $142 
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 March 31, 2024 and December 31, 2023:
March 31, 2024December 31, 2023
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$335 $5 $134 $6 
More than 12 months995 137 999 128 
Total$1,330 $142 $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 March 31, 2024 and December 31, 2023 are as follows:
20242023
(In Millions)
Less than 1 year$71 $82 
1 year - 5 years503 517 
5 years - 10 years526 504 
10 years - 15 years132 121 
15 years - 20 years168 179 
20 years+361 367 
Total$1,761 $1,770 
Entergy Arkansas [Member]  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] The available-for-sale securities held as of March 31, 2024 and December 31, 2023 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2024
Debt Securities$498.8 $1.4 $57.5 
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 March 31, 2024 and December 31, 2023:
March 31, 2024December 31, 2023
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$50.1 $0.8 $22.5 $0.4 
More than 12 months392.5 56.7 403.4 53.2 
Total$442.6 $57.5 $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 March 31, 2024 and December 31, 2023 are as follows:
 20242023
 (In Millions)
Less than 1 year$39.7 $45.3 
1 year - 5 years133.9 132.2 
5 years - 10 years206.8 205.7 
10 years - 15 years40.1 39.9 
15 years - 20 years53.9 49.6 
20 years+24.4 24.2 
Total$498.8 $496.9 
Entergy Louisiana [Member]  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] The available-for-sale securities held as of March 31, 2024 and December 31, 2023 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2024
Debt Securities$780.4 $5.9 $40.3 
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 March 31, 2024 and December 31, 2023:
March 31, 2024December 31, 2023
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$158.3 $2.6 $69.8 $0.9 
More than 12 months360.6 37.7 356.1 36.5 
Total$518.9 $40.3 $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 March 31, 2024 and December 31, 2023 are as follows:
20242023
(In Millions)
Less than 1 year$26.8 $31.4 
1 year - 5 years172.7 181.6 
5 years - 10 years181.7 170.0 
10 years - 15 years80.8 70.2 
15 years - 20 years76.0 90.2 
20 years+242.4 244.7 
Total$780.4 $788.1 
System Energy [Member]  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] The available-for-sale securities held as of March 31, 2024 and December 31, 2023 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2024
Debt Securities$481.5 $2.7 $44.6 
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 March 31, 2024 and December 31, 2023:
March 31, 2024December 31, 2023
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$126.4 $1.8 $42.1 $4.5 
More than 12 months242.0 42.8 239.1 38.0 
Total$368.4 $44.6 $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 March 31, 2024 and December 31, 2023 are as follows:
20242023
(In Millions)
Less than 1 year$4.1 $5.3 
1 year - 5 years196.6 203.4 
5 years - 10 years137.1 128.6 
10 years - 15 years11.5 10.7 
15 years - 20 years37.9 38.8 
20 years+94.3 98.4 
Total$481.5 $485.2