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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Schedule of Effects on Cash Flow Hedges and Fair Value Hedges on Consolidated Earnings and Comprehensive Income (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of unrealized gain/(loss) recognized in OCI $ (7) $ (147) $ (11) $ (9)
Amount of (income)/loss reclassified from AOCI to earnings 9 22 23 64
Foreign exchange contracts        
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of (income)/loss reclassified from AOCI to earnings 0 12 (3) 43
Foreign exchange contracts | Fair value hedges        
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of unrealized gain/(loss) recognized in OCI 0 (8) 12 (34)
Interest rate contracts        
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of (income)/loss reclassified from AOCI to earnings 9 10 26 22
Interest rate contracts | Cash flow hedges        
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of unrealized gain/(loss) recognized in OCI (8) (144) (22) 4
Commodity contracts        
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of (income)/loss reclassified from AOCI to earnings 0 0 0 (1)
Commodity contracts | Cash flow hedges        
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of unrealized gain/(loss) recognized in OCI 1 5 (1) 20
Other contracts | Cash flow hedges        
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of unrealized gain/(loss) recognized in OCI $ 0 $ 0 $ 0 $ 1