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Discontinued Operations - Financial Information about Discontinued Operations (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Loss from discontinued operations, net of tax |  | $ 0 | $ 0 | $ 0 | $ 70 | $ 0 | $ 70 | $ 4,212
Discontinued Operations | Opel/Vauxhall Business and Fincos [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Automotive net sales and revenue |  |  |  |  |  | 0 | 0 | 11,257
GM Financial net sales and revenue |  |  |  |  |  | 0 | 0 | 466
Total net sales and revenue |  |  |  |  |  | 0 | 0 | 11,723
Automotive and other cost of sales |  |  |  |  |  | 0 | 0 | 11,049
GM Financial interest, operating and other expenses |  |  |  |  |  | 0 | 0 | 342
Automotive and other selling, general, and administrative expense |  |  |  |  |  | 0 | 0 | 813
Other expense items |  |  |  |  |  | 0 | 0 | (72)
Loss from discontinued operations before taxes |  |  |  |  |  | 0 | 0 | 553
Loss on sale of discontinued operations before taxes |  |  |  |  |  | 0 | 70 | 2,176
Total loss from discontinued operations before taxes |  |  |  |  |  | 0 | 70 | 2,729
Income tax expense (benefit) |  |  |  |  |  | 0 | 0 | 1,483
Loss from discontinued operations, net of tax | $ 3,900 |  |  |  |  | 0 | 70 | 4,212
Disposal loss |  |  |  |  |  |  |  | 3,900
Discontinued Operations | Opel/Vauxhall Business [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Net sales and revenue |  |  |  |  |  | 1,129 | 1,939 | 853
Purchases and expenses |  |  |  |  |  | 825 | 1,422 | 218
Income tax expense (benefit) | $ 2,300 |  |  |  |  |  |  |
Amount of deferred tax assets transferred |  |  |  |  |  |  |  | 2,000
Discontinued Operations | Discontinued Operations | Opel/Vauxhall Business [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Cash payments |  |  |  |  |  | 975 | 1,849 | 242
Cash receipts |  |  |  |  |  | $ 1,408 | $ 2,310 | $ 1,161

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