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, 2018	Dec. 31, 2017
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	$ 2,806
Ending balance	2,464	$ 2,806
Insurance Contracts
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	18
Ending balance	19	18
Real Estate
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	4
Ending balance		4
Equity Securities - Commingled Funds
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	148
Ending balance	14	148
Other
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	10
Ending balance	6	10
Significant Other Unobservable Inputs (Level 3)
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	156
Ending balance	21	156
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	18
Ending balance	19	18
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	4
Ending balance		4
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	131
Ending balance	0	131
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
Ending balance	2	3
Pension Plan
Defined Benefit Plan, Changes in Fair Value of Pension Plan Assets Classified as Level 3
Beginning balance	2,806	2,507
Foreign currency translation	(160)	231
Ending balance	2,464	2,806
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	18	14
Realized gains (losses)	0	0
Unrealized (losses) gains relating to instruments still held at the reporting date		0
Purchases, sales, issuances and settlements (net)	2	2
Foreign currency translation	(1)	2
Ending balance	19	18
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	4	61
Realized gains (losses)	0	4
Unrealized (losses) gains relating to instruments still held at the reporting date		1
Purchases, sales, issuances and settlements (net)	(4)	(65)
Foreign currency translation	0	3
Ending balance	0	4
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	131	118
Realized gains (losses)	(1)	2
Unrealized (losses) gains relating to instruments still held at the reporting date		18
Purchases, sales, issuances and settlements (net)	(128)	(18)
Foreign currency translation	(2)	11
Ending balance	0	131
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	3
Realized gains (losses)	0	0
Unrealized (losses) gains relating to instruments still held at the reporting date		0
Purchases, sales, issuances and settlements (net)	(1)	0
Foreign currency translation	0	0
Ending balance	$ 2	$ 3

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

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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

+ Details

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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
-Topic 715
-SubTopic 20
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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

+ Details

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