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Pensions and Other Benefits (Tables)
 6 Months Ended
Jun. 30, 2017
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 three and six months ended June 30, 2017 included the following components:

For the three months ended June 30

Pensions

Other benefits
(in millions of Canadian dollars)
2017

2016

2017

2016
Current service cost (benefits earned by employees in the period)
$
26


$
26


$
3


$
3

Interest cost on benefit obligation
113


116


5


5

Expected return on fund assets
(223
)

(211
)

—


—

Recognized net actuarial loss
38


47


—


1

Amortization of prior service costs
(1
)

(1
)

—


—

Net periodic benefit (recovery) cost
$
(47
)

$
(23
)

$
8


$
9




For the six months ended June 30

Pensions

Other benefits
(in millions of Canadian dollars)
2017

2016

2017

2016
Current service cost (benefits earned by employees in the period)
$
51


$
53


$
6


$
6

Interest cost on benefit obligation
226


233


10


10

Expected return on fund assets
(446
)

(423
)

—


—

Recognized net actuarial loss
76


95


1


2

Amortization of prior service costs
(2
)

(3
)

—


—

Net periodic benefit (recovery) cost
$
(95
)

$
(45
)

$
17


$
18