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SHORT-TERM BORROWINGS - Proceeds/Repayments From Borrowing Programs (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]        
Net proceeds received from short-term borrowings $ 707,000,000   $ 971,000,000  
Receivables securitization program        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings 1,600,000,000   150,000,000  
Net proceeds received from short-term borrowings 865,000,000   1,503,000,000  
US commercial paper program        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings $ 8,781,000,000   $ 3,235,000,000  
Exchange rate on proceeds received from short-term borrowings 1.302 1.302 1.260 1.260
Repayments of short-term borrowings $ (9,537,000,000)   $ (2,914,000,000)  
Exchange rate on repayments of short-term borrowings 1.306 1.306 1.259 1.259
Net proceeds received from short-term borrowings $ (756,000,000) $ (558) $ 321,000,000 $ 254
US commercial paper program | United States of America, Dollars        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings   6,745   2,568
Repayments of short-term borrowings   (7,303)   (2,314)
Credit facilities        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings 865,000,000      
Repayments of short-term borrowings (495,000,000)      
Net proceeds received from short-term borrowings (1,002,000,000)   (1,003,000,000)  
Credit facilities | United States of America, Dollars        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings $ 0 $ 0 $ 1,503,000,000 $ 1,200
Exchange rate on proceeds received from short-term borrowings 0 0 1.253 1.253
Repayments of short-term borrowings $ (507,000,000) $ (400) $ (1,003,000,000) $ (800)
Exchange rate on repayments of short-term borrowings 1.268 1.268 1.254 1.254
All Non-Revolving Credit Facility        
Disclosure of detailed information about borrowings [line items]        
Net proceeds received from short-term borrowings $ (137,000,000)   $ 500,000,000