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PENSION AND OTHER POSTRETIREMENT BENEFITS
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
PENSION AND OTHER POSTRETIREMENT BENEFITS PENSION AND OTHER POSTRETIREMENT BENEFITS
 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2019

2018

 
2019

2018

(millions of Canadian dollars)
 
 
 
 
 
Service cost
50

46

 
152

162

Interest cost
51

39

 
152

126

Expected return on plan assets
(84
)
(72
)
 
(252
)
(234
)
Amortization of actuarial loss
8

6

 
24

21

Plan curtailments
—

—

 
—

2

Amortization of prior service costs
(1
)
—


(2
)
(1
)
Net periodic benefit costs
24

19

 
74

76