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Discontinued Operations Financial Information about Discontinued Operations (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 | $ 277 | $ 3,096 | $ 770 | $ 69 |  | $ 70 | $ 4,212 | $ 1
Discontinued Operations [Member] | 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 | 11,257 | 19,704
GM Financial net sales and revenue |  |  |  |  |  |  |  |  |  |  | 0 | 466 | 552
Total net sales and revenue |  |  |  |  |  |  |  |  |  |  | 0 | 11,723 | 20,256
Automotive and other cost of sales |  |  |  |  |  |  |  |  |  |  | 0 | 11,049 | 18,894
GM Financial interest, operating and other expenses |  |  |  |  |  |  |  |  |  |  | 0 | 342 | 423
Automotive and other selling, general, and administrative expense |  |  |  |  |  |  |  |  |  |  | 0 | 813 | 1,356
Other income (expense) items |  |  |  |  |  |  |  |  |  |  | 0 | (72) | 93
Loss from discontinued operations before taxes |  |  |  |  |  |  |  |  |  |  | 0 | 553 | 324
Loss on sale of discontinued operations before taxes |  |  |  |  |  |  |  |  |  |  | 70 | 2,176 | 0
Total loss from discontinued operations before taxes |  |  |  |  |  |  |  |  |  |  | 70 | 2,729 | 324
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | 0 | 1,483 | (323)
Loss from discontinued operations, net of tax | $ 3,900 |  |  |  |  |  |  |  |  |  | $ 70 | 4,212 | $ 1
Disposal loss |  |  |  |  |  |  |  |  |  |  |  | 3,900 |
Discontinued Operations [Member] | Opel/Vauxhall Business [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) | $ 2,300 |  |  |  |  |  |  |  |  | $ 2,300 |  |  |
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  | $ 3,900 |  |  |
Amount of deferred tax assets transferred |  |  |  |  |  |  |  |  |  |  |  | $ 2,000 |

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