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Discontinued Operations Narrative (Details) - Discontinued Operations [Member] - Opel/Vauxhall Business [Member] $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Total net sales and revenue transactions with discontinued operations | $ 607
Purchases and expenses with discontinued operations | 476
Discontinued Operations [Member] |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Cash payments used in operating activities | 426
Cash receipts provided by operating activities | $ 811

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