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Key Management Compensation - Summary of Compensation for Key Management Recognized in Total Comprehensive Income (Loss) (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of transactions between related parties [abstract]    
Salaries, bonuses, director fees and other short-term benefits $ 16 $ 16
Post-employment benefits 1 5
Share option compensation expense (Note 23(c)) 6 7
Compensation expense related to Units (Note 23(d)) 7 52
Key management personnel compensation $ 30 $ 80