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PENSION AND OTHER POSTRETIREMENT BENEFITS
 3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
PENSION AND OTHER POSTRETIREMENT BENEFITS PENSION AND OTHER POSTRETIREMENT BENEFITS
Three months ended
March 31,
20212020
(millions of Canadian dollars)
Service cost48 42 
Interest cost32 33 
Expected return on plan assets(84)(67)
Amortization of actuarial loss and prior service costs14 9 
Net periodic benefit costs
10 17