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Pensions and Other Benefits (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Benefit Cost for Defined Benefit Pension Plans and Other Benefits
The elements of net periodic benefit cost for defined benefit pension plans and other benefits recognized in the quarter included the following components:
 
For the three months ended March 31
 
Pensions
 
Other benefits
(in millions of Canadian dollars)
2016
 
2015
 
2016
 
2015
Current service cost (benefits earned by employees in the period)
$
27

 
$
32

 
$
3

 
$
3

Interest cost on benefit obligation
117

 
115

 
5

 
5

Expected return on fund assets
(212
)
 
(201
)
 
—

 
—

Recognized net actuarial loss
48

 
66

 
1

 
1

Amortization of prior service costs
(2
)
 
(1
)
 
—

 
—

Net periodic benefit (recovery) cost
$
(22
)
 
$
11

 
$
9

 
$
9