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INCOME TAXES - Summary of Net Deferred Income Tax Liability (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Balance – beginning of year $ 10,975 $ 9,073 $ 9,344
Deferred income tax expense (recovery) 557 640 (241)
Deferred income tax (recovery) expense included in other comprehensive income (6) 4 (5)
Foreign exchange adjustments 41 (29) (25)
Business combinations (note 6,7,8) (116) 1,287 0
Balance – end of year $ 11,451 $ 10,975 $ 9,073