Pension, Other Postretirement Benefits and Savings Plans - Changes in Fair Value of Plan Assets (Details) - Non-U.S. - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	$ 2,507
Ending balance	2,806	$ 2,507
Insurance Contracts
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	14
Ending balance	18	14
Real Estate
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	62
Ending balance	4	62
Equity Securities - Commingled Funds
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	134
Ending balance	148	134
Significant Other Unobservable Inputs (Level 3)
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	196
Ending balance	156	196
Significant Other Unobservable Inputs (Level 3) \| Insurance Contracts
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	14
Ending balance	18	14
Significant Other Unobservable Inputs (Level 3) \| Real Estate
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	61
Ending balance	4	61
Significant Other Unobservable Inputs (Level 3) \| Equity Securities - Commingled Funds
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	118
Ending balance	131	118
Pension Plan
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	2,507	2,493
Foreign currency translation	231	(283)
Ending balance	2,806	2,507
Pension Plan \| Significant Other Unobservable Inputs (Level 3) \| Insurance Contracts
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	14	56
Realized gains (losses)	0	3
Unrealized (losses) gains relating to instruments still held at the reporting date	0
Purchases, sales, issuances and settlements (net)	2	(42)
Transfers from Level 3		0
Foreign currency translation	2	(3)
Ending balance	18	14
Pension Plan \| Significant Other Unobservable Inputs (Level 3) \| Real Estate
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	61	72
Realized gains (losses)	4	1
Unrealized (losses) gains relating to instruments still held at the reporting date	1
Purchases, sales, issuances and settlements (net)	(65)	0
Transfers from Level 3		0
Foreign currency translation	3	(12)
Ending balance	4	61
Pension Plan \| Significant Other Unobservable Inputs (Level 3) \| Equity Securities - Commingled Funds
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	118	0
Realized gains (losses)	2	0
Unrealized (losses) gains relating to instruments still held at the reporting date	18
Purchases, sales, issuances and settlements (net)	(18)	132
Transfers from Level 3		0
Foreign currency translation	11	(14)
Ending balance	131	118
Pension Plan \| Significant Other Unobservable Inputs (Level 3) \| Other
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	3	9
Realized gains (losses)	0	0
Unrealized (losses) gains relating to instruments still held at the reporting date	0
Purchases, sales, issuances and settlements (net)	0	0
Transfers from Level 3		(7)
Foreign currency translation	0	1
Ending balance	$ 3	$ 3

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(iv)(02)(A)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

+ References

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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

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from purchases, sales and settlements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(iv)(02)(B)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(iv)(02)(C)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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