v3.25.4
SHORT-TERM BORROWINGS - Proceeds/Repayments From Borrowing Programs (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
CAD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about borrowings [line items]        
Net proceeds received from short-term borrowings $ 1,021   $ 1,138  
Receivables securitization program        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings (400)   (800)  
Repayments of short-term borrowings (400)   (400)  
Net proceeds received (repayment of) from short term borrowings 0   400  
Receivables securitization program | Maximum        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings (2,400)      
US commercial paper program        
Disclosure of detailed information about borrowings [line items]        
Net proceeds received (repayment of) from short term borrowings (451)   265  
Net proceeds received from short-term borrowings (451) $ (318) 265 $ 190
US commercial paper program | United States of America, Dollars        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings (729) (517) (2,759) (2,009)
Repayments of short-term borrowings $ (1,180) $ (835) $ (2,494) $ (1,819)
Exchange rate on proceeds received from short-term borrowings 1.410 1.410 1.373 1.373
Exchange rate on repayments of short-term borrowings 1.413 1.413 1.371 1.371
Credit facilities | United States of America, Dollars        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings $ (7,479) $ (5,397) $ (3,996) $ (2,899)
Repayments of short-term borrowings $ (8,007) $ (5,749) $ (3,523) $ (2,547)
Exchange rate on proceeds received from short-term borrowings 1.386 1.386 1.378 1.378
Exchange rate on repayments of short-term borrowings 1.393 1.393 1.383 1.383
Credit facilities | Canada, Dollars        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings $ (2,000)   $ 0  
All Non-Revolving Credit Facility        
Disclosure of detailed information about borrowings [line items]        
Net proceeds received from short-term borrowings $ 1,472   $ 473