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Financial Instruments - Economic Hedges (Details) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives instruments, pre-tax gains/(losses) recognized in earnings | $ (53) | $ (30) | $ 118 | $ (183)
Currency exchange contracts | Intercompany loans and forecasted interest payments | Interest and other expense, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives instruments, pre-tax gains/(losses) recognized in earnings | 16 | (13) | 30 | (8)
Currency exchange contracts | Forecasted transactions | Interest and other expense, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives instruments, pre-tax gains/(losses) recognized in earnings | (1) | 1 | (6) | (1)
Currency exchange contracts | Forecasted transactions | Cost of sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives instruments, pre-tax gains/(losses) recognized in earnings | 53 | (1) | 118 | 0
Currency exchange contracts | Forecasted transactions | Selling, general and administrative expenses |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives instruments, pre-tax gains/(losses) recognized in earnings | 2 | 0 | (2) | 2
Commodity contracts | Cost of sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives instruments, pre-tax gains/(losses) recognized in earnings | $ (123) | $ (17) | $ (22) | $ (176)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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