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Financial Instruments - Derivative Instruments Fair Value and Measurement Inputs (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Derivative [Line Items] |  |
Derivative fair value net asset (liability) | $ 71 | $ (13)
Currency exchange contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 41 | 35
Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (12) | (19)
Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (277) | (338)
Net investment hedge contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 319 | 309
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 4 | (1)
Quoted Prices in Active Markets for Identical Assets (Level 1) | Currency exchange contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 4 | (1)
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Net investment hedge contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 67 | (12)
Significant Other Observable Inputs (Level 2) | Currency exchange contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 41 | 35
Significant Other Observable Inputs (Level 2) | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (16) | (18)
Significant Other Observable Inputs (Level 2) | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (277) | (338)
Significant Other Observable Inputs (Level 2) | Net investment hedge contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 319 | 309
Significant Unobservable Inputs (Level 3) |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 0 | 0
Significant Unobservable Inputs (Level 3) | Currency exchange contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 0 | 0
Significant Unobservable Inputs (Level 3) | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 0 | 0
Significant Unobservable Inputs (Level 3) | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 0 | 0
Significant Unobservable Inputs (Level 3) | Net investment hedge contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | $ 0 | $ 0

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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