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Pension and Other Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
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 included the following components:
 
For the three months ended March 31
 
Pensions
Other benefits
(in millions of Canadian dollars)
2020
2019
2020
2019
Current service cost (benefits earned by employees)
$
35

$
27

$
3

$
3

Other components of net periodic benefit (recovery) cost:
 
 
 
 
Interest cost on benefit obligation
102

112

5

5

Expected return on fund assets
(237
)
(237
)
—

—

Recognized net actuarial loss
44

21

1

2

Total other components of net periodic benefit (recovery) cost
(91
)
(104
)
6

7

Net periodic benefit (recovery) cost
$
(56
)
$
(77
)
$
9

$
10