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Decommissioning Trust Funds | 9 Months Ended
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Sep. 30, 2025
Decommissioning Trust Fund [Text Block] | DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) The NRC requires certain of the Utility operating companies and System Energy to maintain nuclear decommissioning trusts to fund the costs of decommissioning ANO 1 and 2, River Bend, Waterford 3, and Grand Gulf. Entergy’s nuclear decommissioning trust funds invest in equity securities, fixed-rate debt securities, and cash and cash equivalents. Entergy records decommissioning trust funds on the balance sheet at their fair value. Because of the ability of the Registrant Subsidiaries to recover decommissioning costs in rates and in accordance with the regulatory treatment for decommissioning trust funds, for unrealized gains/(losses) on investment securities, the Registrant Subsidiaries record an offsetting amount in other regulatory liabilities/assets. For the 30% interest in River Bend formerly owned by Cajun, Entergy Louisiana records an offsetting amount in other long-term liabilities on the consolidated balance sheets of Entergy and Entergy Louisiana for the unrealized trust earnings not currently expected to be needed to decommission the plant. Generally, Entergy records gains and losses on its debt and equity securities using the specific identification method to determine the cost basis of its securities. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $277 million and $435 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
As of September 30, 2025 and December 31, 2024, there were no deferred taxes on unrealized gains/(losses). The amortized cost of available-for-sale debt securities was $2,173 million as of September 30, 2025 and $2,121 million as of December 31, 2024. As of September 30, 2025, available-for-sale debt securities had an average coupon rate of approximately 4.16%, an average duration of approximately 6.36 years, and an average maturity of approximately 10.65 years. 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 |
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 |
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 |
During the three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings. Entergy Arkansas Entergy Arkansas holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. 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 |
The amortized cost of available-for-sale debt securities was $615.8 million as of September 30, 2025 and $603.5 million as of December 31, 2024. As of September 30, 2025, the available-for-sale debt securities had an average coupon rate of approximately 3.85%, an average duration of approximately 6.39 years, and an average maturity of approximately 8.70 years. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $79.9 million and $123.6 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
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 |
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 |
During three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings. Entergy Louisiana Entergy Louisiana holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. 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 |
The amortized cost of available-for-sale debt securities was $954.8 million as of September 30, 2025 and $931.5 million as of December 31, 2024. As of September 30, 2025, the available-for-sale debt securities had an average coupon rate of approximately 4.40%, an average duration of approximately 6.33 years, and an average maturity of approximately 12.30 years. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $120.7 million and $192.9 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
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 |
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 |
During the three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings. System Energy System Energy holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. 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 |
The amortized cost of available-for-sale debt securities was $602.8 million as of September 30, 2025 and $585.5 million as of December 31, 2024. As of September 30, 2025, the available-for-sale debt securities had an average coupon rate of approximately 4.11%, an average duration of approximately 6.38 years, and an average maturity of approximately 10.01 years. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $76.4 million and $118.8 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
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 |
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 |
During the three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings.
Entergy Arkansas [Member] |
Decommissioning Trust Fund [Text Block] | DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) The NRC requires certain of the Utility operating companies and System Energy to maintain nuclear decommissioning trusts to fund the costs of decommissioning ANO 1 and 2, River Bend, Waterford 3, and Grand Gulf. Entergy’s nuclear decommissioning trust funds invest in equity securities, fixed-rate debt securities, and cash and cash equivalents. Entergy records decommissioning trust funds on the balance sheet at their fair value. Because of the ability of the Registrant Subsidiaries to recover decommissioning costs in rates and in accordance with the regulatory treatment for decommissioning trust funds, for unrealized gains/(losses) on investment securities, the Registrant Subsidiaries record an offsetting amount in other regulatory liabilities/assets. For the 30% interest in River Bend formerly owned by Cajun, Entergy Louisiana records an offsetting amount in other long-term liabilities on the consolidated balance sheets of Entergy and Entergy Louisiana for the unrealized trust earnings not currently expected to be needed to decommission the plant. Generally, Entergy records gains and losses on its debt and equity securities using the specific identification method to determine the cost basis of its securities. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $277 million and $435 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
As of September 30, 2025 and December 31, 2024, there were no deferred taxes on unrealized gains/(losses). The amortized cost of available-for-sale debt securities was $2,173 million as of September 30, 2025 and $2,121 million as of December 31, 2024. As of September 30, 2025, available-for-sale debt securities had an average coupon rate of approximately 4.16%, an average duration of approximately 6.36 years, and an average maturity of approximately 10.65 years. 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 |
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 |
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 |
During the three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings. Entergy Arkansas Entergy Arkansas holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. 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 |
The amortized cost of available-for-sale debt securities was $615.8 million as of September 30, 2025 and $603.5 million as of December 31, 2024. As of September 30, 2025, the available-for-sale debt securities had an average coupon rate of approximately 3.85%, an average duration of approximately 6.39 years, and an average maturity of approximately 8.70 years. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $79.9 million and $123.6 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
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 |
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 |
During three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings. Entergy Louisiana Entergy Louisiana holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. 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 |
The amortized cost of available-for-sale debt securities was $954.8 million as of September 30, 2025 and $931.5 million as of December 31, 2024. As of September 30, 2025, the available-for-sale debt securities had an average coupon rate of approximately 4.40%, an average duration of approximately 6.33 years, and an average maturity of approximately 12.30 years. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $120.7 million and $192.9 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
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 |
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 |
During the three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings. System Energy System Energy holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. 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 |
The amortized cost of available-for-sale debt securities was $602.8 million as of September 30, 2025 and $585.5 million as of December 31, 2024. As of September 30, 2025, the available-for-sale debt securities had an average coupon rate of approximately 4.11%, an average duration of approximately 6.38 years, and an average maturity of approximately 10.01 years. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $76.4 million and $118.8 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
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 |
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 |
During the three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings.
Entergy Louisiana [Member] |
Decommissioning Trust Fund [Text Block] | DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) The NRC requires certain of the Utility operating companies and System Energy to maintain nuclear decommissioning trusts to fund the costs of decommissioning ANO 1 and 2, River Bend, Waterford 3, and Grand Gulf. Entergy’s nuclear decommissioning trust funds invest in equity securities, fixed-rate debt securities, and cash and cash equivalents. Entergy records decommissioning trust funds on the balance sheet at their fair value. Because of the ability of the Registrant Subsidiaries to recover decommissioning costs in rates and in accordance with the regulatory treatment for decommissioning trust funds, for unrealized gains/(losses) on investment securities, the Registrant Subsidiaries record an offsetting amount in other regulatory liabilities/assets. For the 30% interest in River Bend formerly owned by Cajun, Entergy Louisiana records an offsetting amount in other long-term liabilities on the consolidated balance sheets of Entergy and Entergy Louisiana for the unrealized trust earnings not currently expected to be needed to decommission the plant. Generally, Entergy records gains and losses on its debt and equity securities using the specific identification method to determine the cost basis of its securities. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $277 million and $435 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
As of September 30, 2025 and December 31, 2024, there were no deferred taxes on unrealized gains/(losses). The amortized cost of available-for-sale debt securities was $2,173 million as of September 30, 2025 and $2,121 million as of December 31, 2024. As of September 30, 2025, available-for-sale debt securities had an average coupon rate of approximately 4.16%, an average duration of approximately 6.36 years, and an average maturity of approximately 10.65 years. 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 |
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 |
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 |
During the three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings. Entergy Arkansas Entergy Arkansas holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. 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 |
The amortized cost of available-for-sale debt securities was $615.8 million as of September 30, 2025 and $603.5 million as of December 31, 2024. As of September 30, 2025, the available-for-sale debt securities had an average coupon rate of approximately 3.85%, an average duration of approximately 6.39 years, and an average maturity of approximately 8.70 years. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $79.9 million and $123.6 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
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 |
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 |
During three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings. Entergy Louisiana Entergy Louisiana holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. 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 |
The amortized cost of available-for-sale debt securities was $954.8 million as of September 30, 2025 and $931.5 million as of December 31, 2024. As of September 30, 2025, the available-for-sale debt securities had an average coupon rate of approximately 4.40%, an average duration of approximately 6.33 years, and an average maturity of approximately 12.30 years. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $120.7 million and $192.9 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
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 |
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 |
During the three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings. System Energy System Energy holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. 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 |
The amortized cost of available-for-sale debt securities was $602.8 million as of September 30, 2025 and $585.5 million as of December 31, 2024. As of September 30, 2025, the available-for-sale debt securities had an average coupon rate of approximately 4.11%, an average duration of approximately 6.38 years, and an average maturity of approximately 10.01 years. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $76.4 million and $118.8 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
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 |
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 |
During the three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings.
System Energy [Member] |
Decommissioning Trust Fund [Text Block] | DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) The NRC requires certain of the Utility operating companies and System Energy to maintain nuclear decommissioning trusts to fund the costs of decommissioning ANO 1 and 2, River Bend, Waterford 3, and Grand Gulf. Entergy’s nuclear decommissioning trust funds invest in equity securities, fixed-rate debt securities, and cash and cash equivalents. Entergy records decommissioning trust funds on the balance sheet at their fair value. Because of the ability of the Registrant Subsidiaries to recover decommissioning costs in rates and in accordance with the regulatory treatment for decommissioning trust funds, for unrealized gains/(losses) on investment securities, the Registrant Subsidiaries record an offsetting amount in other regulatory liabilities/assets. For the 30% interest in River Bend formerly owned by Cajun, Entergy Louisiana records an offsetting amount in other long-term liabilities on the consolidated balance sheets of Entergy and Entergy Louisiana for the unrealized trust earnings not currently expected to be needed to decommission the plant. Generally, Entergy records gains and losses on its debt and equity securities using the specific identification method to determine the cost basis of its securities. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $277 million and $435 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
As of September 30, 2025 and December 31, 2024, there were no deferred taxes on unrealized gains/(losses). The amortized cost of available-for-sale debt securities was $2,173 million as of September 30, 2025 and $2,121 million as of December 31, 2024. As of September 30, 2025, available-for-sale debt securities had an average coupon rate of approximately 4.16%, an average duration of approximately 6.36 years, and an average maturity of approximately 10.65 years. 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 |
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 |
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 |
During the three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings. Entergy Arkansas Entergy Arkansas holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. 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 |
The amortized cost of available-for-sale debt securities was $615.8 million as of September 30, 2025 and $603.5 million as of December 31, 2024. As of September 30, 2025, the available-for-sale debt securities had an average coupon rate of approximately 3.85%, an average duration of approximately 6.39 years, and an average maturity of approximately 8.70 years. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $79.9 million and $123.6 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
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 |
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 |
During three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings. Entergy Louisiana Entergy Louisiana holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. 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 |
The amortized cost of available-for-sale debt securities was $954.8 million as of September 30, 2025 and $931.5 million as of December 31, 2024. As of September 30, 2025, the available-for-sale debt securities had an average coupon rate of approximately 4.40%, an average duration of approximately 6.33 years, and an average maturity of approximately 12.30 years. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $120.7 million and $192.9 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
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 |
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 |
During the three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings. System Energy System Energy holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. 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 |
The amortized cost of available-for-sale debt securities was $602.8 million as of September 30, 2025 and $585.5 million as of December 31, 2024. As of September 30, 2025, the available-for-sale debt securities had an average coupon rate of approximately 4.11%, an average duration of approximately 6.38 years, and an average maturity of approximately 10.01 years. The unrealized gains/(losses) recognized during the three and nine months ended September 30, 2025 on equity securities still held as of September 30, 2025 were $76.4 million and $118.8 million, respectively. The equity securities are generally held in funds that are designed to approximate or somewhat exceed the return of the Standard & Poor’s 500 Index. A relatively small percentage of the equity securities are held in funds that are designed to approximate or somewhat exceed the return of the Wilshire 4500 Index. The debt securities are generally held in individual government and credit issuances. 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 |
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 |
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 |
During the three and nine months ended September 30, 2025 and 2024, gross gains and gross losses related to available-for-sale debt securities were reclassified out of other regulatory liabilities/assets into earnings.

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