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Benefit Plans - Changes in Level 3 Plan Assets (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at January 1	$ 1,902	$ 1,057
Net Realized and Unrealized Gains/ (Losses)	21	45
Net Purchases, Issuances and Settlements	(110)	730
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	52	70
Fair value of plan assets at December 31	1,865	1,902
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	1,836	1,032
Net Realized and Unrealized Gains/ (Losses)	16	8
Net Purchases, Issuances and Settlements	(110)	727
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	49	69
Fair value of plan assets at December 31	1,791	1,836
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	62	22
Net Realized and Unrealized Gains/ (Losses)	5	36
Net Purchases, Issuances and Settlements	0	3
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	3	1
Fair value of plan assets at December 31	70	62
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	3
Net Realized and Unrealized Gains/ (Losses)	0	1
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	$ 4	$ 4

X

- Definition

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

+ References

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

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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
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
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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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-Publisher FASB
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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

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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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