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Pension and other PostRetirement Benefits (Tables)

12 Months Ended

Dec. 31, 2018

PENSIONS AND OTHER POST RETIREMENT BENEFITS

Schedule of defined benefit obligations and funded status

				Pension Benefits				Other                   Post-Retirement                   Benefits
($ millions)				2018		2017		2018		2017
Change in benefit obligation
	Benefit obligation at beginning of year			6 717		6 280		597		587
	Obligations acquired through acquisition (note 31)			185		—		8		—
	Current service costs			235		193		13		14
	Plan participants' contributions			15		14		—		—
	Benefits paid			(296	)	(294	)	(23	)	(21	)
	Interest costs			236		236		21		22
	Disposal (note 33)			—		(69	)	—		(9	)
	Foreign exchange			14		(2	)	1		(1	)
	Settlements			5		7		—		—
	Actuarial remeasurement:
		Experience (gain) loss arising on plan liabilities		(26	)	2		(18	)	(12	)
		Actuarial gain arising from changes in demographic assumptions		(1	)	(4	)	—		(9	)
		Actuarial (gain) loss arising from changes in financial assumptions		(354	)	354		(42	)	26
Benefit obligation at end of year				6 730		6 717		557		597
Change in plan assets
	Fair value of plan assets at beginning of year			5 799		5 356		—		—
	Assets acquired through acquisition (note 31)			153		—		—		—
	Employer contributions			182		160		—		—
	Plan participants' contributions			15		14		—		—
	Benefits paid			(273	)	(269	)	—		—
	Disposal (note 33)			—		(71	)	—		—
	Foreign exchange			14		(3	)	—		—
	Settlements			5		7		—		—
	Administrative costs			(2	)	(2	)	—		—
	Income on plan assets			201		200		—		—
	Actuarial remeasurement:
		Return on plan assets (less than) greater than discount rate		(299	)	407		—		—
Fair value of plan assets at end of year				5 795		5 799		—		—
Net unfunded obligation				935		918		557		597

Schedule of defined benefit plan expenses

			Pension Benefits				Other                   Post-Retirement                   Benefits
($ millions)			2018		2017		2018		2017
Analysis of amount charged to earnings:
	Current service costs		235		193		13		14
	Interest costs		35		36		21		22
Defined benefit plans expense			270		229		34		36
Defined contribution plans expense			77		74		—		—
Total benefit plans expense charged to earnings			347		303		34		36

Components of defined benefit costs recognized in Other Comprehensive Income:

		Pension Benefits				Other                   Post-Retirement                   Benefits
($ millions)		2018		2017		2018		2017
Return on plan assets (excluding amounts included in net interest expense)		299		(407	)	—		—
Experience (gain) loss arising on plan liabilities		(26	)	2		(18	)	(12	)
Actuarial (gain) loss arising from changes in financial assumptions		(354	)	354		(42	)	26
Actuarial gain arising from changes in demographic assumptions		(1	)	(4	)	—		(9	)
Actuarial (gain) loss recognized in other comprehensive income		(82	)	(55	)	(60	)	5

Schedule of weighted average actuarial assumptions

		Pension Benefits				Other                   Post-Retirement                   Benefits
(%)		December 31 2018		December 31 2017		December 31 2018		December 31 2017
Discount rate		3.80		3.40		3.90		3.40
Rate of compensation increase		3.00		3.00		3.00		3.00

Schedule of changes in assumed assumptions

			Pension Benefits
($ millions)			Increase		Decrease
1% change in discount rate
	Effect on the aggregate service and interest costs		(23	)	30
	Effect on the benefit obligations		(874	)	1 127

			Other                   Post-Retirement                   Benefits
($ millions)			Increase		Decrease
1% change in discount rate
	Effect on the benefit obligations		(65	)	81
1% change in health care cost
	Effect on the aggregate service and interest costs		1		(1	)
	Effect on the benefit obligations		27		(23	)

Schedule of weighted average pension plan asset allocations based on market value

(%)			2018		2017
Equities, comprised of:
	– Canada		13		18
	– United States		17		19
	– Foreign		18		19
			48		56
Fixed income, comprised of:
	– Canada		43		39
Real estate, comprised of:
	– Canada		9		5
Total			100		100

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The disclosure of a net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

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