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Discontinued Operations (Details) - Discontinued Operations [Member] - Opel/Vauxhall Business [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net sales and revenue | $ 441 | $ 561 | $ 868 | $ 1,168
Purchases and expenses | $ 213 | $ 361 | 405 | 837
Discontinued Operations [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash payments |  |  | 616 | 994
Cash receipts |  |  | $ 1,057 | $ 1,510

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