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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Summary of Income Tax Expense
For the three months ended September 30For the nine months ended September 30
(in millions of Canadian dollars)2021202020212020
Current income tax expense$39 $144 $427 $430 
Deferred income tax expense 130 45 190 133 
Income tax expense$169 $189 $617 $563