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Decommissioning Trust Funds (Tables)
 6 Months Ended
Jun. 30, 2024
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]
The available-for-sale securities held as of June 30, 2024 and December 31, 2023 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2024
Debt Securities$1,922 $10 $139 
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 June 30, 2024 and December 31, 2023:
June 30, 2024December 31, 2023
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$453 $5 $134 $6 
More than 12 months949 134 999 128 
Total$1,402 $139 $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 June 30, 2024 and December 31, 2023 were as follows:
20242023
(In Millions)
Less than 1 year$76 $82 
1 year - 5 years568 517 
5 years - 10 years575 504 
10 years - 15 years120 121 
15 years - 20 years186 179 
20 years+397 367 
Total$1,922 $1,770 
Entergy Arkansas [Member]  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] The available-for-sale securities held as of June 30, 2024 and December 31, 2023 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2024
Debt Securities$554.4 $1.9 $59.0 
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 June 30, 2024 and December 31, 2023:
June 30, 2024December 31, 2023
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$70.8 $1.1 $22.5 $0.4 
More than 12 months388.7 57.9 403.4 53.2 
Total$459.5 $59.0 $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 June 30, 2024 and December 31, 2023 were as follows:
 20242023
 (In Millions)
Less than 1 year$43.5 $45.3 
1 year - 5 years156.3 132.2 
5 years - 10 years234.8 205.7 
10 years - 15 years31.7 39.9 
15 years - 20 years59.8 49.6 
20 years+28.3 24.2 
Total$554.4 $496.9 
Entergy Louisiana [Member]  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] The available-for-sale securities held as of June 30, 2024 and December 31, 2023 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2024
Debt Securities$812.6 $4.6 $39.8 
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 June 30, 2024 and December 31, 2023:
June 30, 2024December 31, 2023
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$275.6 $2.7 $69.8 $0.9 
More than 12 months340.4 37.1 356.1 36.5 
Total$616.0 $39.8 $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 June 30, 2024 and December 31, 2023 were as follows:
20242023
(In Millions)
Less than 1 year$27.3 $31.4 
1 year - 5 years189.2 181.6 
5 years - 10 years186.9 170.0 
10 years - 15 years79.8 70.2 
15 years - 20 years84.7 90.2 
20 years+244.7 244.7 
Total$812.6 $788.1 
System Energy [Member]  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] The available-for-sale securities held as of June 30, 2024 and December 31, 2023 are summarized as follows:
Fair
Value		Total
Unrealized
Gains		Total
Unrealized
Losses
(In Millions)
2024
Debt Securities$554.6 $3.2 $40.2 
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 June 30, 2024 and December 31, 2023:
June 30, 2024December 31, 2023
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
(In Millions)
Less than 12 months$106.8 $1.6 $42.1 $4.5 
More than 12 months219.8 38.6 239.1 38.0 
Total$326.6 $40.2 $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 June 30, 2024 and December 31, 2023 were as follows:
20242023
(In Millions)
Less than 1 year$5.4 $5.3 
1 year - 5 years222.1 203.4 
5 years - 10 years153.5 128.6 
10 years - 15 years8.1 10.7 
15 years - 20 years41.0 38.8 
20 years+124.5 98.4 
Total$554.6 $485.2