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Income Taxes - Summary of Net Deferred Income Tax Liability (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Balance – beginning of year $ 11,451 $ 10,975 $ 9,073
Deferred income tax (recovery) expense (894) 557 640
Deferred income tax expense (recovery) included in other comprehensive income 8 (6) 4
Foreign exchange adjustments (26) 41 (29)
Business combinations (note 6,7) 0 (116) 1,287
Balance – end of year $ 10,539 $ 11,451 $ 10,975