v3.26.3
INCOME TAXES - Provision for Income Taxes (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) $ 930 $ 338 $ 2,248 $ 967
Deferred Tax Expense (Recovery) 71 (327) 339 (520)
Tax Expense (Recovery) From Continuing Operations 1,001 11 2,587 447
Canada        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) 772 288 1,925 791
United States        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) 93 0 134 0
Asia Pacific        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) 59 42 167 144
Other International        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) $ 6 $ 8 $ 22 $ 32