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Income Taxes - Summary of Movement in Net Deferred Income Taxes Account (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance $ 5,425 $ 4,974
Income statement change 674 431
Tax charge relating to components of other comprehensive income (47) 90
Foreign exchange and other differences 119 (70)
Ending balance $ 6,171 $ 5,425