Pension and Other Postretirement Benefit Plans - Changes in Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plans
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Benefit obligations as of beginning of year	$ 5,246	$ 5,188
Service cost	16	14	$ 15
Interest cost	133	151	181
Actuarial (gain) loss	(168)	265
Participant contributions	6	7
Special termination benefits	0	3
Curtailments	(7)	(2)
Settlements	(15)	(118)
Benefits paid	(345)	(341)
Effect of foreign currency exchange rate changes	31	79
Benefit obligations as of end of year	4,897	5,246	5,188
OPEB Plans
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Benefit obligations as of beginning of year	136	147
Service cost	1	1	0
Interest cost	3	4	6
Actuarial (gain) loss	(7)	(6)
Participant contributions	2	2
Special termination benefits	0	0
Curtailments	(1)	(1)
Settlements	0	0
Benefits paid	(13)	(13)
Effect of foreign currency exchange rate changes	1	2
Benefit obligations as of end of year	$ 122	$ 136	$ 147

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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- Definition

Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees.

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Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

+ References

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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- Definition

Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

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- Definition

Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement.

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