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Discontinued Operations Narrative (Details) $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) day | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax (Note 3) |  |  | $ (277) | $ (3,096) | $ (770) | $ (69) | $ (120) | $ 5 | $ 106 | $ 8 |  | $ (4,212) | $ (1) | $ 25
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax (Note 3) | (3,900) |  |  |  |  |  |  |  |  |  |  | (4,212) | (1) | 25
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | 1,483 | (323) | (678)
Loss on sale of discontinued operations before taxes |  |  |  |  |  |  |  |  |  |  |  | 2,176 | $ 0 | $ 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 |  |  |  |  |  |  |  |  |  |  |  |
Warrant vesting period |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Threshold to sell the warrants after exercise (in days) | day |  | 35 |  |  |  |  |  |  |  |  |  |  |  |
Charge at closing |  |  |  |  |  |  |  |  |  |  | $ 6,200 |  |  |
Income (loss) from discontinued operations, net of tax (Note 3) |  |  |  |  |  |  |  |  |  |  | (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 |  |  |  |  |  |  |  |  |  |  |  | 853 |  |
Purchases and expenses with discontinued operations |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  | 242 |  |
Cash receipts provided by operating activities |  |  |  |  |  |  |  |  |  |  |  | $ 1,200 |  |

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