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Pensions and Other Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
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 months ended March 31, 2018 included the following components:
 
For the three months ended March 31
 
Pensions
 
Other benefits
(in millions of Canadian dollars)
2018
 
2017
 
2018
 
2017
Current service cost (benefits earned by employees)
$
30

 
$
25

 
$
3

 
$
3

Other components of net periodic benefit (recovery) cost:
 
 
 
 
 
 
 
Interest cost on benefit obligation
110

 
113

 
4

 
5

Expected return on fund assets
(239
)
 
(223
)
 
—

 
—

Recognized net actuarial loss
29

 
38

 
1

 
1

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

 
—

Total other components of net periodic benefit (recovery) cost
$
(101
)
 
$
(73
)
 
$
5

 
$
6

Net periodic benefit (recovery) cost
$
(71
)
 
$
(48
)
 
$
8

 
$
9