XML 104 R79.htm IDEA: XBRL DOCUMENT v3.10.0.1
Income Taxes - Components of Income Tax Expense (Recovery) Recognized in Equity (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Major components of tax expense (income) [abstract]    
Current income tax expense (recovery) $ 6  
Deferred income tax expense (recovery) (7) $ (2)
Income tax expense (recovery) $ (1) $ (2)