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Income Taxes (Components of Net Deferred Income Tax Asset (Liability)) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
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)