Benefit Plans - Schedule of Changes in Level 3 Plan Assets (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at January 1	$ 816	$ 602
Net Realized and Unrealized Gains/ (Losses)	63	11
Net Purchases, Issuances and Settlements	235	166
Net Transfers Into/(Out of) Level 3	0	(25)
Currency Impact	(57)	62
Fair value of plan assets at December 31	1,057	816
Non-U.S. equity securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at January 1	0	3
Net Realized and Unrealized Gains/ (Losses)	0	0
Net Purchases, Issuances and Settlements	0	0
Net Transfers Into/(Out of) Level 3	0	(3)
Currency Impact	0	0
Fair value of plan assets at December 31	0	0
Pooled funds - 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	0	35
Net Realized and Unrealized Gains/ (Losses)	0	0
Net Purchases, Issuances and Settlements	0	(16)
Net Transfers Into/(Out of) Level 3	0	(21)
Currency Impact	0	2
Fair value of plan assets at December 31	0	0
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	790	538
Net Realized and Unrealized Gains/ (Losses)	62	10
Net Purchases, Issuances and Settlements	236	182
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	(56)	60
Fair value of plan assets at December 31	1,032	790
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	23	22
Net Realized and Unrealized Gains/ (Losses)	1	1
Net Purchases, Issuances and Settlements	(1)	0
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	(1)	0
Fair value of plan assets at December 31	22	23
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	3	4
Net Realized and Unrealized Gains/ (Losses)	0	0
Net Purchases, Issuances and Settlements	0	0
Net Transfers Into/(Out of) Level 3	0	(1)
Currency Impact	0	0
Fair value of plan assets at December 31	$ 3	$ 3

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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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.

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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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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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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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