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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Income Tax Disclosure [Abstract] |  |  |  |
Income (loss) before income taxes | $ 97 | $ 570 | $ (90) | $ 958
Income tax benefit (expense) | $ (25) | $ (112) | $ 27 | $ (181)
Effective tax rate | 25.80% | 19.60% | 30.00% | 18.90%
Federal income tax statutory tax rate | 21.00% | 21.00% | 21.00% | 21.00%
Income tax benefit (expense) computed at the federal income tax statutory tax rate | $ (20) | $ (120) | $ 19 | $ (201)
Income tax increase (decrease) due to: |  |  |  |
NDT taxes | (12) | (4) | (10) | (15)
State income taxes, net of federal benefit | (2) | (17) | 3 | (29)
Other permanent differences | 9 | 6 | 15 | 12
Change in valuation allowance | 0 | 14 | 0 | 34
Nuclear PTC | 0 | 9 | 0 | 18
Income tax benefit (expense) | $ (25) | $ (112) | $ 27 | $ (181)

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