Benefit Plans - Changes in Level 3 Plan Assets (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at January 1	$ 1,865	$ 1,902
Net Realized and Unrealized Gains/ (Losses)	(170)	21
Net Purchases, Issuances and Settlements	785	(110)
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	(14)	52
Fair value of plan assets at December 31	2,466	1,865
Corporate bonds and other fixed-income securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at January 1	1,791	1,836
Net Realized and Unrealized Gains/ (Losses)	(178)	16
Net Purchases, Issuances and Settlements	784	(110)
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	(10)	49
Fair value of plan assets at December 31	2,387	1,791
Real estate
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at January 1	70	62
Net Realized and Unrealized Gains/ (Losses)	7	5
Net Purchases, Issuances and Settlements	1	0
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	(4)	3
Fair value of plan assets at December 31	74	70
Private equity and other
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at January 1	4	4
Net Realized and Unrealized Gains/ (Losses)	1	0
Net Purchases, Issuances and Settlements	0	0
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	0	0
Fair value of plan assets at December 31	$ 5	$ 4

Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) For Actual Return (Loss) On Plan Assets

No definition available.

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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.

+ References

No definition available.

+ Details

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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-Publisher FASB
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- Definition

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

+ References

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- Definition

Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

+ References

+ Details

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs.

+ References

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