v3.26.1
Income Taxes (Provision For Income Taxes) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Income Tax Disclosure [Line Items]        
Total Current Tax Expense (Recovery) $ 22 $ 26 $ 35 $ 69
Total Deferred Tax Expense (Recovery) 61 66 (149) (11)
Income Tax Expense (Recovery) $ 83 $ 92 $ (114) $ 58
Effective Tax Rate 15.40% 23.10% 39.60% 28.20%
United States [Member]        
Income Tax Disclosure [Line Items]        
Total Current Tax Expense (Recovery) $ 6 $ 1 $ 7 $ 12
Total Deferred Tax Expense (Recovery) (39) 63 (284) 159
Canada [Member]        
Income Tax Disclosure [Line Items]        
Total Current Tax Expense (Recovery) 16 25 28 57
Total Deferred Tax Expense (Recovery) $ 100 $ 3 $ 135 $ (170)