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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  | $ (277) | $ (3,096) | $ (770) | $ (69) | $ (120) | $ 5 | $ 106 | $ 8 |  | $ (4,212) | $ (1) | $ 25
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 |  |  |  |  |  |  |  |  |  |  | 11,257 | 19,704 | 19,075
GM Financial net sales and revenue |  |  |  |  |  |  |  |  |  |  | 466 | 552 | 573
Total net sales and revenue |  |  |  |  |  |  |  |  |  |  | 11,723 | 20,256 | 19,648
Automotive cost of sales |  |  |  |  |  |  |  |  |  |  | 11,049 | 18,894 | 18,343
GM Financial interest, operating and other expenses |  |  |  |  |  |  |  |  |  |  | 342 | 423 | 429
Automotive selling, general, and administrative expense |  |  |  |  |  |  |  |  |  |  | 813 | 1,356 | 1,517
Other income and (expense) items |  |  |  |  |  |  |  |  |  |  | (72) | 93 | (12)
Loss from discontinued operations before taxes |  |  |  |  |  |  |  |  |  |  | 553 | 324 | 653
Loss on sale of discontinued operations before taxes |  |  |  |  |  |  |  |  |  |  | 2,176 | 0 | 0
Total loss from discontinued operations before taxes |  |  |  |  |  |  |  |  |  |  | 2,729 | 324 | 653
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | 1,483 | (323) | (678)
Income (loss) from discontinued operations, net of tax | $ (3,900) |  |  |  |  |  |  |  |  |  | (4,212) | $ (1) | $ 25
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 |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  | $ (3,900) |  |  |
Amount of deferred tax assets transferred |  |  |  |  |  |  |  |  |  |  | $ 2,000 |  |

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