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Discontinued Operations Narrative (Details) - Discontinued Operations [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018
Opel/Vauxhall Business [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Total net sales and revenue transactions with discontinued operations | $ 561 |  | $ 1,200
Purchases and expenses with discontinued operations | $ 361 |  | 837
Other costs and charges |  | $ 421 |
Opel/Vauxhall Business [Member] | Discontinued Operations [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Cash payments used in operating activities |  |  | 994
Cash receipts provided by operating activities |  |  | $ 1,500
Fincos [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Disposal loss |  | $ 324 |

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