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Pensions and Other Post-Employment Benefits - Summary of Fair Value of the Plan Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Fair Value Of Plan Assets [Abstract]    
Equity Funds $ 70 $ 89
Bond Funds 29 29
Non-Invested Assets 12 11
Real Estate Funds   9
Cash and Cash Equivalents 2 3
Total fair value $ 113 $ 141