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Pensions and Other Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost for Defined Benefit Pension Plans and Other Benefits Net periodic benefit costs for defined benefit pension plans and other benefits recognized in the three and nine months ended September 30, 2017 included the following components:

For the three months ended September 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


$
2

Interest cost on benefit obligation
112


117


5


6

Expected return on fund assets
(223
)

(211
)

—


—

Recognized net actuarial loss
38


48


1


1

Amortization of prior service costs
(1
)

(2
)

—


—

Net periodic (recovery) benefit cost
$
(48
)

$
(22
)

$
9


$
9




For the nine months ended September 30

Pensions

Other benefits
(in millions of Canadian dollars)
2017

2016

2017

2016
Current service cost (benefits earned by employees in the period)
$
77


$
79


$
9


$
8

Interest cost on benefit obligation
338


350


15


16

Expected return on fund assets
(669
)

(634
)

—


—

Recognized net actuarial loss
114


143


2


3

Amortization of prior service costs
(3
)

(5
)

—


—

Net periodic (recovery) benefit cost
$
(143
)

$
(67
)

$
26


$
27