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Discontinued Operations Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 31, 2017 | Jul. 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
Opel/Vauxhall Business and Fincos [Member] | Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net consideration for transferred business | $ 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received from sale | 2,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Charge at closing | 6,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss from discontinued operations, net of tax | 3,900 |  |  |  |  |  |  |  |  |  |  | 70 | 4,212 | 1
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,483 | (323)
Loss on sale of discontinued operations before taxes |  |  |  |  |  |  |  |  |  |  |  | 70 | 2,176 | $ 0
Underfunded pension liabilities of retired and former employees retained by GM |  |  |  |  |  |  |  |  |  |  |  |  | 6,800 |
Opel/Vauxhall Business [Member] | Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants received |  | $ 808 |  |  |  |  |  |  |  |  |  |  |  |
De-risking premium payment |  | 455 |  |  |  |  |  |  |  |  |  |  | 455 |
Charge at closing |  |  |  |  |  |  |  |  |  |  | $ 6,200 |  |  |
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | 3,900 |  |  |
Income tax expense (benefit) | 2,300 |  |  |  |  |  |  |  |  |  | $ 2,300 |  |  |
Charge for deferred tax assets no longer realizable upon transfer |  | 4,300 |  |  |  |  |  |  |  |  |  |  |  |
De-risking premium payment and deferred pension losses |  | $ 1,500 |  |  |  |  |  |  |  |  |  |  |  |
Other costs and charges |  |  |  |  |  |  |  |  |  |  |  |  | 421 |
Underfunded pension liabilities of current employees transferred to PSA Group |  |  |  |  |  |  |  |  |  |  |  |  | 3,100 |
Payment to PSA Group at closing for assumed underfunded pension liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 3,400 |
Total net sales and revenue transactions with discontinued operations |  |  |  |  |  |  |  |  |  |  |  | 1,900 | 853 |
Purchases and expenses with discontinued operations |  |  |  |  |  |  |  |  |  |  |  | 1,400 | 218 |
Fincos [Member] | Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on sale of discontinued operations before taxes | 525 |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation loss | $ 197 |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations [Member] | 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 |  |  |  |  |  |  |  |  |  |  |  | 1,800 | 242 |
Cash receipts provided by operating activities |  |  |  |  |  |  |  |  |  |  |  | $ 2,300 | $ 1,200 |

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