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Income Taxes - Provision for Income Taxes (Details) - CAD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) $ 338 $ 250 $ 967 $ 1,015
Deferred Tax Expense (Recovery) (327) (46) (520) (124)
Tax Expense (Recovery) From Continuing Operations 11 204 447 891
Canada        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) 288 184 791 830
United States        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) 0 0 0 2
Asia Pacific        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) 42 57 144 157
Other International        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) $ 8 $ 9 $ 32 $ 26