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Pension Plans and Other Post-Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2020

Employee Benefits [Abstract]

Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets

The following tables set forth the status of the defined benefit pension and other post-retirement benefit plans:

						2020																		2019
			Pension						Other post-retirement									Total						Pension			Other post-retirement									Total
Change in defined benefit obligations:
Defined benefit obligation, January 1						$	3,805					$	279					$	4,084					$	3,458					$	262					$	3,720
Current service cost						58						6						64						52						5						57
Interest cost						110						9						119						123						10						133
Actuarial losses (gains)						278						(1)						277						360						20						380
Benefits paid						(184)						(14)						(198)						(158)						(14)						(172)
Curtailment losses (gains)						—						—						—						1						—						1
Settlements						(5)						—						(5)						—						—						—
Foreign exchange rate movement						(2)						(2)						(4)						(31)						(4)						(35)
Defined benefit obligation, December 31						$	4,060					$	277					$	4,337					$	3,805					$	279					$	4,084
Change in plan assets:
Fair value of plan assets, January 1						$	3,596					$	—					$	3,596					$	3,253					$	—					$	3,253
Administrative expense						(1)						—						(1)						(1)						—						(1)
Interest income on plan assets						102						—						102						115						—						115
Return on plan assets (excluding amounts included in net interest expense)						305						—						305						306						—						306
Employer contributions						97						14						111						111						14						125
Benefits paid						(184)						(14)						(198)						(158)						(14)						(172)
Settlements						(7)						—						(7)						—						—						—
Foreign exchange rate movement						1						—						1						(30)						—						(30)
Fair value of plan assets, December 31						$	3,909					$	—					$	3,909					$	3,596					$	—					$	3,596
Amounts recognized on Statement of Financial Position:
Fair value of plan assets						$	3,909					$	—					$	3,909					$	3,596					$	—					$	3,596
Defined benefit (obligation)						(4,060)						(277)						(4,337)						(3,805)						(279)						(4,084)
Net recognized (liability) asset, December 31						$	(151)					$	(277)					$	(428)					$	(209)					$	(279)					$	(488)
Components of net benefit expense recognized:
Current service cost						$	58					$	6					$	64					$	52					$	5					$	57
Administrative expense						1						—						1						1						—						1
Net interest expense (income)						8						9						17						8						10						18
Curtailment losses (gains)						—						—						—						1						—						1
Settlements						2						—						2						—						—						—
Other long-term employee benefit losses (gains)						—						—						—						—						5						5
Net benefit expense						$	69					$	15					$	84					$	62					$	20					$	82
Remeasurement of net recognized (liability) asset:
Return on plan assets (excluding amounts included in net interest expense)						$	305					$	—					$	305					$	306					$	—					$	306
Actuarial gains (losses) arising from changes in demographic assumptions						(3)						2						(1)						28						1						29
Actuarial gains (losses) arising from changes in financial assumptions						(278)						(19)						(297)						(393)						(18)						(411)
Actuarial gains (losses) arising from experience adjustments						3						18						21						5						2						7
Foreign exchange rate movement						—						2						2						2						4						6
Components of defined benefit costs recognized in Other comprehensive income (loss)						$	27					$	3					$	30					$	(52)					$	(11)					$	(63)

Schedule of Assumptions Used

						2020																		2019
						Canada %						UK %						U.S. %			Canada %									UK %						U.S. %
To determine defined benefit obligation at end of year:
Discount rate for pension plans						2.70						1.30						2.65						3.00						2.00						3.45
Rate of compensation increase						2.80						n/a						n/a						3.00						n/a						n/a
Pension increases						0.00-0.05						2.95						n/a			0.00-0.15									2.95						n/a
To determine net benefit expense for year:
Discount rate for pension plans						3.00						2.00						3.45						3.60						2.85						4.40
Rate of compensation increase						3.00						n/a						n/a						3.00						n/a						n/a
Pension increases						0.00-0.015						2.95						n/a			0.00-0.15									3.15						n/a
Health care trend rates:
Initial health care trend rate						5.30						n/a						6.50						5.36						n/a						6.50
Ultimate health care trend rate						4.00						n/a						5.00						4.50						n/a						5.00
Year ultimate health care trend rate reached						2040						n/a						2025						2030						n/a						2025
						2020																		2019
						Canada						UK						U.S.			Canada									UK						U.S.
Mortality rates:
Life expectancy (in years) for individuals currently at age 65:
Male						23						23						22						23						23						22
Female						25						25						23						25						24						24
Life expectancy (in years) at 65 for individuals currently at age 45:
Male						24						25						23						24						25						24
Female						26						27						25						26						27						25
Average duration (in years) of pension obligation						17.2						17.7						12.7						16.7						16.6						13.4

Schedule of Effect of Percentage-Point Changes For Sensitives

The impact of changes in each key assumption may result in greater than proportional changes in sensitivities.

			Pension						Post-retirement benefits
Interest/discount rate sensitivity:(1)
1% decrease						$	754					$	34
1% increase						$	(586)					$	(29)
Rate of compensation increase assumption:
1% decrease						$	(82)					n/a
1% increase						$	86					n/a
Health care trend rate assumption:
1% decrease						n/a						$	(13)
1% increase						n/a						$	15
Mortality rates:(2)
10% decrease						$	98					$	6

(1)    Represents a parallel shift in interest rates across the entire yield curve, resulting in a change in the discount rate assumption.

(2)    Represents 10% decrease in mortality rates at each age.

Schedule of Allocation of Plan Assets

Composition of fair value of plan assets, December 31:

						2020						2019
Equity investments						3		%				3		%
Fixed income investments						73		%				77		%
Real estate investments						7		%				7		%
Qualifying insurance contract						8		%				8		%
Other						9		%				5		%
Total composition of fair value of plan assets						100		%				100		%

Schedule Of Expected Future Benefit Contributions And Benefit Payments

The following tables set forth the expected contributions and expected future benefit payments of the defined benefit pension and other post-retirement benefit plans:

			Pension						Post-retirement									Total
Expected contributions for the next 12 months						$	84					$	16					$	100

Expected Future Benefit Payments

						2021						2022						2023						2024						2025			2026 to 2030
Pension						$	153					$	149					$	159					$	161					$	167					$	899
Post-retirement						16						16						17						17						18						93
Total						$	169					$	165					$	176					$	178					$	185					$	992

Schedule of Expected Contributions and Expected Future Benefit Payments

The following tables set forth the expected contributions and expected future benefit payments of the defined benefit pension and other post-retirement benefit plans:

			Pension						Post-retirement									Total
Expected contributions for the next 12 months						$	84					$	16					$	100

Expected Future Benefit Payments

						2021						2022						2023						2024						2025			2026 to 2030
Pension						$	153					$	149					$	159					$	161					$	167					$	899
Post-retirement						16						16						17						17						18						93
Total						$	169					$	165					$	176					$	178					$	185					$	992

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The disclosure of defined benefit plans. [Refer: Defined benefit plans [member]]

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The disclosure of the fair value of defined benefit plan assets. [Refer: Plan assets [member]; Defined benefit plans [member]]

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

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The disclosure of a sensitivity analysis for significant actuarial assumptions used to determine the present value of a defined benefit obligation. [Refer: Actuarial assumptions [member]; Defined benefit obligation, at present value]

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Employee Benefits [Abstract]

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