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Finance Income and Finance Expense - Schedule of Finance Income and Finance Expense (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finance income    
Investment income $ 33 $ 17
Total finance income 33 17
Finance expense    
Debt interest 338 385
Finance lease interest 24 2
Letters of credit and standby fees 65 76
Net interest expense on retirement benefit plans 6 12
Accretion on decommissioning and restoration provisions 101 81
Other 11 6
Finance expense gross 545 562
Less capitalized borrowing costs (293) (333)
Total finance expense $ 252 $ 229