PENSION AND OTHER POSTRETIREMENT BENEFITS (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Schedule of net benefit costs recognized

	Three months ended March 31,
	2018		2017
(millions of Canadian dollars)
Service cost	65		54
Interest cost	45		32
Expected return on plan assets	(82	)	(51	)
Amortization of prior service costs	(1	)	—
Amortization of actuarial loss	7		9
Net periodic benefit costs	34		44