XML 68 R112.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
LONG-TERM DEBT - Bank Credit and Letter of Credit Facilities (Details)
$ in Millions
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about borrowings [line items]              
Long-term debt $ 15,967,000,000   $ 13,390,000,000 $ 13,390,000,000      
Short-term borrowings 2,238,000,000   $ 2,255,000,000 2,255,000,000      
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 1.25% 1.25%          
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 2.25% 2.25%          
Revolving Credit Facility Tranche due September 2023              
Disclosure of detailed information about borrowings [line items]              
Maximum borrowing capacity       2,500,000,000      
Revolving Credit Facility Tranche due September 2021              
Disclosure of detailed information about borrowings [line items]              
Maximum borrowing capacity       700,000,000      
Bank and Letter of Credit Facilities              
Disclosure of detailed information about borrowings [line items]              
Maximum borrowing capacity $ 3,300,000,000     4,200,000,000      
Available liquidity 1,600,000,000     1,600,000,000      
Long-term debt 100,000,000     1,000,000,000.0      
US commercial paper              
Disclosure of detailed information about borrowings [line items]              
Short-term borrowings $ 1,588,000,000 $ 1,223   $ 1,605,000,000 $ 1,177 $ 935,000,000 $ 746