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Income Taxes - Temporary Differences in Deferred Tax Assets and Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Abstract]    
Deferred tax assets $ 1,634 $ 1,455
Deferred tax liabilities 383 406
Net deferred tax asset $ 1,251 $ 1,049