Income Taxes (Tables)

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Summary of Income Tax Expense

	For the three months ended June 30				For the six months ended June 30
(in millions of Canadian dollars)	2017		2016		2017		2016
Current income tax expense	$	114	$	27	$	195	$	104
Deferred income tax expense	24		90		91		183
Income tax expense	$	138	$	117	$	286	$	287