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 | ||