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Fair Value Measurements - Assets and Liabilities Table (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, net asset (liability), total | $ 0 | $ (3)
Other current assets [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current assets | 54 | 57
Other current liabilities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current liabilities | (54) | (60)
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, net asset (liability), total | 0 | (3)
Fair Value, Inputs, Level 1 [Member] | Other current assets [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current assets | 54 | 57
Fair Value, Inputs, Level 1 [Member] | Other current liabilities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current liabilities | (54) | (60)
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, net asset (liability), total | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Other current assets [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current assets | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Other current liabilities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, net asset (liability), total | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Other current assets [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other current assets | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Other current liabilities [Member] |  |
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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- Definition Fair value of asset after deduction of liability. + References No definition available. + Details
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