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Credit Facilities, Long-Term Debt and Lease Liabilities - Senior Notes (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Oct. 22, 2020
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Jul. 20, 2018
Disclosure of detailed information about borrowings [line items]                
Interest rate         4.07%     4.509%
Borrowings       $ 3,361     $ 3,212  
Long-term debt | Net investment hedges                
Disclosure of detailed information about borrowings [line items]                
Notional amount     $ 370     $ 370    
Senior notes | Minimum                
Disclosure of detailed information about borrowings [line items]                
Interest rate     4.50% 4.50%        
Senior notes | Maximum                
Disclosure of detailed information about borrowings [line items]                
Interest rate     6.50% 6.50%        
6.65% Senior notes, due May 2018                
Disclosure of detailed information about borrowings [line items]                
Interest rate 6.65%              
Borrowings $ 500              
Redemption of noncurrent borrowings $ 516 $ 617            
Redemption of prepayment premium recognized in net interest expense   5            
Accrued and unpaid interest   $ 14