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PENSION AND OTHER POSTRETIREMENT BENEFITS (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Schedule of net benefit costs recognized
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 
Net periodic benefit costs
10 17