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Derivative Instruments - Gain (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net (loss) gain from derivative instruments not designated as hedges | $ (8) | $ (7) | $ 14
Derivative instruments not designated as hedges: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net (loss) gain from derivative instruments not designated as hedges | (22) | 5 | 15
Foreign exchange contracts | Foreign exchange (loss) gain | Derivative instruments not designated as hedges: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net (loss) gain from derivative instruments not designated as hedges | (24) | 5 | 11
Forward interest rate swaps | Interest expense and other, net | Derivative instruments not designated as hedges: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net (loss) gain from derivative instruments not designated as hedges | $ 2 | $ 0 | $ 4

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + 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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