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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Summary of Income Tax Expense
 
For the three months ended March 31
(in millions of Canadian dollars)
2018
 
2017
Current income tax expense
$
81

 
$
81

Deferred income tax expense
41

 
67

Income tax expense
$
122

 
$
148