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v3.25.3

Decommissioning Trust Funds (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2025 and December 31, 2024:
|  | 2025 |  | 2024
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
|  | (In Millions)
Less than 12 months |  | $273 |  |  | $4 |  |  | $1,102 |  |  | $24 |
More than 12 months |  | 553 |  |  | 42 |  |  | 510 |  |  | 56 |
Total |  | $826 |  |  | $46 |  |  | $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 September 30, 2025 and December 31, 2024 were as follows:
| 2025 |  | 2024
| (In Millions)
Less than 1 year | $33 |  |  | $36 |
1 year - 5 years | 639 |  |  | 574 |
5 years - 10 years | 659 |  |  | 629 |
10 years - 15 years | 142 |  |  | 166 |
15 years - 20 years | 210 |  |  | 218 |
20 years+ | 472 |  |  | 424 |
Total | $2,155 |  |  | $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 and nine months ended September 30, 2025 and 2024:
|  | Three Months Ended |  | Nine Months Ended
|  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (In Millions)
Proceeds from disposition of securities |  | $223 |  |  | $173 |  |  | $712 |  |  | $504 |
Realized gains |  | $2 |  |  | $3 |  |  | $4 |  |  | $3 |
Realized losses |  | $3 |  |  | $5 |  |  | $11 |  |  | $26 |
Debt Securities, Available-for-Sale | The available-for-sale debt securities held as of September 30, 2025 and December 31, 2024 are summarized as follows:
|  | 2025 |  | 2024
|  | (In Millions)
Fair value |  | $2,155 |  |  | $2,047 |
Unrealized gains |  | $28 |  |  | $7 |
Unrealized losses |  | $46 |  |  | $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 September 30, 2025 and December 31, 2024:
|  | 2025 |  | 2024
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
|  | (In Millions)
Less than 12 months |  | $49.6 |  |  | $0.6 |  |  | $282.8 |  |  | $8.2 |
More than 12 months |  | 224.7 |  |  | 13.5 |  |  | 195.0 |  |  | 17.6 |
Total |  | $274.3 |  |  | $14.1 |  |  | $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 September 30, 2025 and December 31, 2024 were as follows:
| 2025 |  | 2024
| (In Millions)
Less than 1 year | $24.1 |  |  | $31.7 |
1 year - 5 years | 150.6 |  |  | 142.5 |
5 years - 10 years | 263.4 |  |  | 231.0 |
10 years - 15 years | 45.5 |  |  | 62.2 |
15 years - 20 years | 52.8 |  |  | 62.8 |
20 years+ | 72.9 |  |  | 48.8 |
Total | $609.3 |  |  | $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 and nine months ended September 30, 2025 and 2024:
|  | Three Months Ended |  | Nine Months Ended
|  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (In Millions)
Proceeds from disposition of securities |  | $15.0 |  |  | $4.2 |  |  | $15.0 |  |  | $22.1 |
Realized gains |  | $0.1 |  |  | $— |  |  | $0.1 |  |  | $0.1 |
Realized losses |  | $0.1 |  |  | $0.3 |  |  | $0.1 |  |  | $1.2 |
Debt Securities, Available-for-Sale | The available-for-sale debt securities held as of September 30, 2025 and December 31, 2024 are summarized as follows:
|  | 2025 |  | 2024
|  | (In Millions)
Fair value |  | $609.3 |  |  | $579.0 |
Unrealized gains |  | $7.6 |  |  | $1.2 |
Unrealized losses |  | $14.1 |  |  | $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 September 30, 2025 and December 31, 2024:
|  | 2025 |  | 2024
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
|  | (In Millions)
Less than 12 months |  | $154.5 |  |  | $3.2 |  |  | $543.8 |  |  | $8.8 |
More than 12 months |  | 177.5 |  |  | 12.8 |  |  | 178.4 |  |  | 18.1 |
Total |  | $332.0 |  |  | $16.0 |  |  | $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 September 30, 2025 and December 31, 2024 were as follows:
| 2025 |  | 2024
| (In Millions)
Less than 1 year | $2.6 |  |  | $4.4 |
1 year - 5 years | 230.3 |  |  | 188.2 |
5 years - 10 years | 235.9 |  |  | 259.4 |
10 years - 15 years | 75.8 |  |  | 80.9 |
15 years - 20 years | 111.2 |  |  | 106.1 |
20 years+ | 295.6 |  |  | 269.1 |
Total | $951.4 |  |  | $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 and nine months ended September 30, 2025 and 2024:
|  | Three Months Ended |  | Nine Months Ended
|  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (In Millions)
Proceeds from disposition of securities |  | $120.8 |  |  | $51.9 |  |  | $302.3 |  |  | $162.8 |
Realized gains |  | $1.0 |  |  | $0.5 |  |  | $1.2 |  |  | $0.7 |
Realized losses |  | $1.9 |  |  | $1.5 |  |  | $5.9 |  |  | $9.2 |
Debt Securities, Available-for-Sale | The available-for-sale debt securities held as of September 30, 2025 and December 31, 2024 are summarized as follows:
|  | 2025 |  | 2024
|  | (In Millions)
Fair value |  | $951.4 |  |  | $908.1 |
Unrealized gains |  | $12.6 |  |  | $3.6 |
Unrealized losses |  | $16.0 |  |  | $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 September 30, 2025 and December 31, 2024:
|  | 2025 |  | 2024
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $68.7 |  |  | $0.6 |  |  | $275.6 |  |  | $6.8 |
More than 12 months |  | 150.9 |  |  | 15.6 |  |  | 136.8 |  |  | 20.8 |
Total |  | $219.6 |  |  | $16.2 |  |  | $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 September 30, 2025 and December 31, 2024 were as follows:
| 2025 |  | 2024
| (In Millions)
Less than 1 year | $6.0 |  |  | $0.2 |
1 year - 5 years | 258.2 |  |  | 243.7 |
5 years - 10 years | 159.2 |  |  | 138.9 |
10 years - 15 years | 20.3 |  |  | 22.7 |
15 years - 20 years | 46.1 |  |  | 49.4 |
20 years+ | 104.8 |  |  | 104.9 |
Total | $594.6 |  |  | $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 and nine months ended September 30, 2025 and 2024:
|  | Three Months Ended |  | Nine Months Ended
|  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (In Millions)
Proceeds from disposition of securities |  | $87.3 |  |  | $117.3 |  |  | $394.9 |  |  | $318.8 |
Realized gains |  | $1.2 |  |  | $2.2 |  |  | $2.6 |  |  | $2.4 |
Realized losses |  | $0.6 |  |  | $3.3 |  |  | $4.6 |  |  | $15.2 |
Debt Securities, Available-for-Sale | The available-for-sale debt securities held as of September 30, 2025 and December 31, 2024 are summarized as follows:
|  | 2025 |  | 2024
|  | (In Millions)
Fair value |  | $594.6 |  |  | $559.8 |
Unrealized gains |  | $8.1 |  |  | $1.9 |
Unrealized losses |  | $16.2 |  |  | $27.6 |

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