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Income Taxes (Provision For Income Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Line Items]      
Total Current Tax Expense (Recovery) $ 42 $ 82 $ 281
Total Deferred Tax Expense (Recovery) (514) 144 144
Income Tax Expense (Recovery) (472) 226 425
United States [Member]      
Income Tax Disclosure [Line Items]      
Total Current Tax Expense (Recovery) (6) 8 12
Total Deferred Tax Expense (Recovery) 202 228 248
Canada [Member]      
Income Tax Disclosure [Line Items]      
Total Current Tax Expense (Recovery) 48 74 269
Total Deferred Tax Expense (Recovery) $ (716) $ (84) $ (104)