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Other Assets - Schedule of Other Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other Noncurrent Assets [Abstract]    
Intangible Assets $ 89 $ 101
Equity Investments 52 52
Investment in Associate 97  
Net Investment in Finance Leases 52 30
Long-Term Receivables and Prepaids 11 28
Other 12  
Other assets $ 313 $ 211