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Stock Based Compensation (Narrative) (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 31, 2025 | Feb. 06, 2025 | May 31, 2025 | Feb. 28, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  | $ 0.60 |  |  | $ 0.57 |  |  | $ 1.80 | $ 1.70
Dividends, Common Stock, Cash |  |  |  |  | $ 267,939,000 | $ 258,467,000 | $ 258,249,000 | $ 241,720,000 | $ 241,296,000 | $ 240,959,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.64 |  |  |  |  |  |  |  |  |  |  |
System Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock, Cash |  |  | $ 30,000,000 | $ 20,000,000 |  |  |  |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  | 366,136 |  |  | 1,548,386 |  |  | 325,454 | 2,477,756
Forward Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  | 94,446 |  |  | 3,485,736 |  |  | 901,408 | 3,164,908
Equity Distribution Program [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Distribution Sales Agreement, Increase in Maximum Aggregate Gross Sales Price |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |
Forward Contract Indexed to Equity, Settlement, Cash, Amount |  |  |  |  | $ 2,800,000,000 |  |  |  |  |  | $ 2,800,000,000 |
Employee Stock Option | 2019 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures |  |  |  | 366,136 |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  | $ 17.43 |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number |  |  |  |  | 2,946,252 |  |  |  |  |  | 2,946,252 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price |  |  |  |  | $ 56.51 |  |  |  |  |  | $ 56.51 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value |  |  |  |  | $ 101,300,000 |  |  |  |  |  | $ 101,300,000 |
Restricted Stock [Member] | 2019 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures |  | 510,009 |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 82.79 |  |  |  |  |  |  |  |  |  |
Long Term Performance Unit [Member] | 2019 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures |  | 187,036 |  |  |  |  |  |  |  |  |  |
Percent of performance measure based on relative total shareholder return |  | 80.00% |  |  |  |  |  |  |  |  | 80.00% |
Percent of performance measure based on environmental achievement measure |  | 20.00% |  |  |  |  |  |  |  |  | 20.00% |
Long Term Performance Unit [Member] | Performance measure based on relative total shareholder return [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 115.13 |  |  |  |  |  |  |  |  |  |
Long Term Performance Unit [Member] | Performance measure based on the environmental achievement measure [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 82.79 |  |  |  |  |  |  |  |  |  |

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