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SHORT-TERM BORROWINGS - Movement in 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]        
Short-term borrowings, beginning balance $ 2,200,000,000      
Net (repayment of) proceeds received from short-term borrowings 707,000,000   $ 971,000,000  
Loss (gain) on foreign exchange (127,000,000)   (10,000,000)  
Short-term borrowings, ending balance 2,985,000,000   2,200,000,000  
US commercial paper program        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings, beginning balance $ 893,000,000 $ 704 $ 571,000,000 $ 449
Exchange rate on short-term borrowings | $ / $ 1.268 1.268 1.272 1.272
Net (repayment of) proceeds received from short-term borrowings $ (756,000,000) $ (558) $ 321,000,000 $ 254
Exchange rate on (repayment of) proceeds received from short-term borrowings, net | $ / $ 1.355 1.355 1.264 1.264
Discount on issuance $ 15,000,000 $ 12 $ 2,000,000 $ 1
Exchange rate on discounts on issuance of short-term borrowings | $ / $ 1.250 1.250    
Loss (gain) on foreign exchange $ (62,000,000)   1,000,000  
Short-term borrowings, ending balance $ 214,000,000 $ 158 $ 893,000,000 $ 704
Exchange rate on short-term borrowings | $ / $ 1.354 1.354 1.268 1.268
Non-revolving credit facility borrowings        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings, beginning balance $ 507,000,000   $ 0  
Net (repayment of) proceeds received from short-term borrowings (137,000,000)   500,000,000  
Loss (gain) on foreign exchange 1,000,000   7,000,000  
Short-term borrowings, ending balance $ 371,000,000   $ 507,000,000