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PENSION AND OTHER POSTRETIREMENT BENEFITS
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
PENSION AND OTHER POSTRETIREMENT BENEFITS PENSION AND OTHER POSTRETIREMENT BENEFITS
 
Three months ended
June 30,
 
Six months ended
June 30,
 
2019

2018

 
2019

2018

(millions of Canadian dollars)
 
 
 
 
 
Service cost
51

51

 
102

116

Interest cost
50

42

 
101

87

Expected return on plan assets
(84
)
(80
)
 
(168
)
(162
)
Amortization of actuarial loss
8

8

 
16

15

Plan curtailments
—

2

 
—

2

Amortization of prior service costs
—

—


(1
)
(1
)
Net periodic benefit costs
25

23

 
50

57