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Income Taxes - Change in Deferred Income Tax Balances (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Taxes    
Net deferred tax income tax liability, beginning of year $ 9,081 $ 8,758
Recognized in deferred income tax (recovery) / expense (990) 56
Recognized in other comprehensive income 264 277
Foreign exchange, acquisition and other 9 (10)
Net deferred income tax liability, end of year $ 8,364 $ 9,081