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PENSION AND OTHER POSTRETIREMENT BENEFITS
3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
PENSION AND OTHER POSTRETIREMENT BENEFITS PENSION AND OTHER POSTRETIREMENT BENEFITS
 
Three months ended
March 31,
 
2020

2019

(millions of Canadian dollars)
 
 
Service cost
42

51

Interest cost
33

51

Expected return on plan assets
(67
)
(84
)
Amortization of actuarial loss and prior service costs
9

7

Net periodic benefit costs
17

25