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Pensions and Other Benefits
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Pensions and Other Benefits
Pension and other benefits

In the three months ended March 31, 2017, the Company made contributions of $12 million (three months ended March 31, 2016 - $20 million) to its defined benefit pension plans. 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)
2017
 
2016
 
2017
 
2016
Current service cost (benefits earned by employees in the period)
$
25

 
$
27

 
$
3

 
$
3

Interest cost on benefit obligation
113

 
117

 
5

 
5

Expected return on fund assets
(223
)
 
(212
)
 
—

 
—

Recognized net actuarial loss
38

 
48

 
1

 
1

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

 
—

Net periodic benefit (recovery) cost
$
(48
)
 
$
(22
)
 
$
9

 
$
9