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Commitments - Summary of Future Aggregate Minimum Lease Payments Under Non-cancellable Operating Leases (Detail) - CAD ($)
Dec. 31, 2018
Dec. 31, 2017
Disclosure of future minimum commitments for non cancellable operating lease [line items]    
Future aggregate minimum lease payments under non-cancellable operating leases $ 439,000,000 $ 599,000,000
Less than one year [member]    
Disclosure of future minimum commitments for non cancellable operating lease [line items]    
Future aggregate minimum lease payments under non-cancellable operating leases 113,000,000 93,000,000
One to five years [member]    
Disclosure of future minimum commitments for non cancellable operating lease [line items]    
Future aggregate minimum lease payments under non-cancellable operating leases 162,000,000 179,000,000
Thereafter [member]    
Disclosure of future minimum commitments for non cancellable operating lease [line items]    
Future aggregate minimum lease payments under non-cancellable operating leases $ 164,000,000 $ 327,000,000