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Income Taxes (Components of Net Deferred Income Tax Asset (Liability)) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Income Tax Disclosure [Abstract] |  |
Deferred Income Tax Assets, Property, plant and equipment | $ 732 | $ 27
Deferred Income Tax Assets, Risk management | 0 | 6
Deferred Income Tax Assets, Interest and other deferred deductions | 2 | 40
Deferred Income Tax Assets, Net operating and net capital losses carried forward | 888 | 1,665
Deferred Income Tax Assets,General business credits | 271 | 200
Deferred Income Tax Assets, Foreign tax credits | 22 | 0
Deferred Income Tax Assets, CAMT credits | 2 | 40
Deferred Income Tax Assets, Compensation plans | 46 | 45
Deferred Income Tax Assets, Other | 5 | 0
Deferred Income Tax Assets, Valuation allowance | (765) | (1,204)
Deferred Income Tax Liabilities, Property, plant and equipment | (844) | (971)
Deferred Income Tax Liabilities, Risk management | (17) | (17)
Deferred Income Tax Liabilities, Other | 0 | (23)
Net Deferred Income Tax Asset | $ 342 |
Net Deferred Income Tax Liability |  | $ (192)

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