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Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred tax assets |  |  |
Postretirement benefits other than pensions | $ 1,948 | $ 2,720 |
Pension and other employee benefit plans | 3,285 | 5,141 |
Warranties, dealer and customer allowances, claims and discounts | 5,675 | 8,074 |
Property, plant and equipment | 0 | 397 |
Miscellaneous | 1,697 | 1,733 |
Total deferred tax assets before valuation allowances | 30,699 | 37,585 |
Less: valuation allowances | (6,690) | (3,908) |
Total deferred tax assets | 24,009 | 33,677 |
Deferred tax liabilities |  |  |
Property, plant and equipment | 418 | 0 |
Intangible assets | 735 | 1,027 |
Total deferred tax liabilities | 1,153 | 1,027 |
Net deferred tax assets | 22,856 | 32,650 |
Change in valuation allowances | 2,712 | 237 | $ (3,554)
Discontinued Operations [Member] | Opel/Vauxhall Business [Member] |  |  |
Deferred tax liabilities |  |  |
Change in valuation allowances | 2,300 |  |
U.S. [Member] |  |  |
Deferred tax assets |  |  |
U.S. capitalized research expenditures | 4,413 | 6,127 |
Operating loss and tax credit carryforwards | 8,578 | 8,987 |
Deferred tax liabilities |  |  |
Operating loss and tax credit carryforwards subject to expiration | 8,600 |  |
Non-U.S. [Member] |  |  |
Deferred tax assets |  |  |
Operating loss and tax credit carryforwards | 5,103 | 4,406 |
Deferred tax liabilities |  |  |
Operating loss and tax credit carryforwards subject to expiration | 925 |  |
Operating loss and tax credit carryforwards not subject to expiration | 4,200 |  |
Germany, Spain and South Korea [Member] |  |  |
Deferred tax assets |  |  |
Less: valuation allowances | $ (6,700) |  |
Spain, South Korea and Certain U.S. States [Member] |  |  |
Deferred tax assets |  |  |
Less: valuation allowances |  | $ (3,900) |

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