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Fair Value Measurements - Assets and Liabilities Table (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, net asset (liability), total | $ (1) | $ (1)
Short-term derivative asset |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current assets | 44 | 50
Short-term derivative liability |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current liabilities | (45) | (51)
Quoted Prices in Active Markets (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, net asset (liability), total | (1) | (1)
Quoted Prices in Active Markets (Level 1) | Short-term derivative asset |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current assets | 44 | 50
Quoted Prices in Active Markets (Level 1) | Short-term derivative liability |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current liabilities | (45) | (51)
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, net asset (liability), total | 0 | 0
Significant Other Observable Inputs (Level 2) | Short-term derivative asset |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Short-term derivative liability |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, net asset (liability), total | 0 | 0
Significant Unobservable Inputs (Level 3) | Short-term derivative asset |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Short-term derivative liability |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current liabilities | $ 0 | $ 0

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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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