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Pensions and Other Benefits
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Pensions and Other Benefits In the three months ended June 30, 2018, the Company made contributions of $11 million (three months ended June 30, 2017 - $12 million) to its defined benefit pension plans. In the six months ended June 30, 2018, the Company made net contributions of $12 million (six months ended June 30, 2017 - $24 million), to its defined benefit pension plans, which is net of a $10 million refund of plan surplus (six months ended June 30, 2017 - $nil). Net periodic benefit costs for defined benefit pension plans and other benefits recognized in the three and six months ended June 30, 2018 included the following components:
 
For the three months ended June 30
 
Pensions
 
Other benefits
(in millions of Canadian dollars)
2018
2017
 
2018
2017
Current service cost (benefits earned by employees)
$
30

$
26

 
$
3

$
3

Other components of net periodic benefit (recovery) cost:
 
 
 
 
 
Interest cost on benefit obligation
109

113

 
5

5

Expected return on fund assets
(238
)
(223
)
 
—

—

Recognized net actuarial loss
28

38

 
1

—

Amortization of prior service costs
—

(1
)
 
—

—

Total other components of net periodic benefit (recovery) cost
(101
)
(73
)
 
6

5

Net periodic benefit (recovery) cost
$
(71
)
$
(47
)
 
$
9

$
8



 
For the six months ended June 30
 
Pensions
 
Other benefits
(in millions of Canadian dollars)
2018
2017
 
2018
2017
Current service cost (benefits earned by employees)
$
60

$
51

 
$
6

$
6

Other components of net periodic benefit (recovery) cost:
 
 
 
 
 
Interest cost on benefit obligation
219

226

 
9

10

Expected return on fund assets
(477
)
(446
)
 
—

—

Recognized net actuarial loss
57

76

 
2

1

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

—

Total other components of net periodic benefit (recovery) cost
(202
)
(146
)
 
11

11

Net periodic benefit (recovery) cost
$
(142
)
$
(95
)
 
$
17

$
17