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Financial Instruments - Derivatives and hedging (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Assets, fair value | $ 221 | $ 150
Liabilities, fair value | (248) | (95)
Currency exchange contracts | Designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Assets, fair value | 2 | 6
Liabilities, fair value | (1) | 0
Currency exchange contracts | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Assets, fair value | 219 | 144
Liabilities, fair value | $ (247) | $ (95)

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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