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Pensions and Other Benefits (Tables)
 6 Months Ended
Jun. 30, 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 three and six months ended June 30, 2016 included the following components:

For the three months ended June 30

Pensions

Other benefits
(in millions of Canadian dollars)
2016

2015

2016

2015
Current service cost (benefits earned by employees in the period)
$
26


$
32


$
3


$
3

Interest cost on benefit obligation
116


116


5


5

Expected return on fund assets
(211
)

(212
)

—


—

Recognized net actuarial loss
47


66


1


1

Amortization of prior service costs
(1
)

(2
)

—


—

Net periodic benefit (recovery) cost
$
(23
)

$
—


$
9


$
9




For the six months ended June 30

Pensions

Other benefits
(in millions of Canadian dollars)
2016

2015

2016

2015
Current service cost (benefits earned by employees in the period)
$
53


$
64


$
6


$
6

Interest cost on benefit obligation
233


231


10


10

Expected return on fund assets
(423
)

(413
)

—


—

Recognized net actuarial loss
95


132


2


2

Amortization of prior service costs
(3
)

(3
)

—


—

Net periodic benefit (recovery) cost
$
(45
)

$
11


$
18


$
18