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LONG-TERM DEBT - Bank Credit and Letter of Credit Facilities (Details)
$ in Millions
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]            
Long-term debt $ 16,751,000,000   $ 15,967,000,000      
Short-term borrowings 1,221,000,000   2,238,000,000      
Revolving Credit Facility            
Disclosure of detailed information about borrowings [line items]            
Maximum borrowing capacity $ 3,200,000,000          
Revolving Credit Facility | Bank Prime Rate or Base Rate | Minimum            
Disclosure of detailed information about borrowings [line items]            
Spread on variable rate 0.00% 0.00%        
Revolving Credit Facility | Bank Prime Rate or Base Rate | Maximum            
Disclosure of detailed information about borrowings [line items]            
Spread on variable rate 1.75% 1.75%        
Revolving Credit Facility | Bankers' Acceptance Rate or London Inter-Bank Offered Rate | Minimum            
Disclosure of detailed information about borrowings [line items]            
Spread on variable rate 0.85% 0.85%        
Revolving Credit Facility | Bankers' Acceptance Rate or London Inter-Bank Offered Rate | Maximum            
Disclosure of detailed information about borrowings [line items]            
Spread on variable rate 2.75% 2.75%        
Bank and Letter of Credit Facilities            
Disclosure of detailed information about borrowings [line items]            
Maximum borrowing capacity $ 3,300,000,000   3,300,000,000      
Available liquidity 2,600,000,000   1,600,000,000      
Long-term debt 100,000,000   100,000,000      
Commercial paper program            
Disclosure of detailed information about borrowings [line items]            
Short-term borrowings $ 571,000,000 $ 449 $ 1,600,000,000 $ 1,223 $ 1,605,000,000 $ 1,177