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Decommissioning Trust Funds (Tables) | 6 Months Ended
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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, 2024 |  | December 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 months |  | 949 |  |  | 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:
| 2024 |  | 2023
| (In Millions)
Less than 1 year | $76 |  |  | $82 |
1 year - 5 years | 568 |  |  | 517 |
5 years - 10 years | 575 |  |  | 504 |
10 years - 15 years | 120 |  |  | 121 |
15 years - 20 years | 186 |  |  | 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, 2024 |  | December 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 months |  | 388.7 |  |  | 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:
| 2024 |  | 2023
| (In Millions)
Less than 1 year | $43.5 |  |  | $45.3 |
1 year - 5 years | 156.3 |  |  | 132.2 |
5 years - 10 years | 234.8 |  |  | 205.7 |
10 years - 15 years | 31.7 |  |  | 39.9 |
15 years - 20 years | 59.8 |  |  | 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, 2024 |  | December 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 months |  | 340.4 |  |  | 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:
| 2024 |  | 2023
| (In Millions)
Less than 1 year | $27.3 |  |  | $31.4 |
1 year - 5 years | 189.2 |  |  | 181.6 |
5 years - 10 years | 186.9 |  |  | 170.0 |
10 years - 15 years | 79.8 |  |  | 70.2 |
15 years - 20 years | 84.7 |  |  | 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, 2024 |  | December 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 months |  | 219.8 |  |  | 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:
| 2024 |  | 2023
| (In Millions)
Less than 1 year | $5.4 |  |  | $5.3 |
1 year - 5 years | 222.1 |  |  | 203.4 |
5 years - 10 years | 153.5 |  |  | 128.6 |
10 years - 15 years | 8.1 |  |  | 10.7 |
15 years - 20 years | 41.0 |  |  | 38.8 |
20 years+ | 124.5 |  |  | 98.4 |
Total | $554.6 |  |  | $485.2 |

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