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Debt - Summary of Debt Continuity (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about borrowings [line items]        
Borrowings at beginning of period $ 6,369      
Non-cash changes        
Borrowings at end of balance 5,519   $ 6,369  
Debt Continuity [member]        
Disclosure of detailed information about borrowings [line items]        
Borrowings at beginning of period 6,369 $ 5,077 8,343 $ 6,213
Cash flows        
Scheduled debt repayments (28) (22) (64) (49)
Debt repurchases (1,328) (1,015) (1,831) (1,356)
Finance lease payments (c) (54) (42) (34) (26)
Non-cash changes        
Loss on debt repurchases (a)(b) 26 20 141 105
Changes in foreign exchange rates 472 (20) (424)  
Finance lease liabilities (c) 78 60 234 187
Finance fees and discount amortization 1   4 3
Other (17) (12)    
Borrowings at end of balance $ 5,519 $ 4,046 $ 6,369 $ 5,077