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Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets      
Postretirement benefits other than pensions $ 1,584 $ 1,948  
Pension and other employee benefit plans 3,020 3,285  
Warranties, dealer and customer allowances, claims and discounts 6,307 5,675  
Miscellaneous 2,034 1,697  
Total deferred tax assets before valuation allowances 33,105 30,699  
Less: valuation allowances (7,976) (6,690)  
Total deferred tax assets 25,129 24,009  
Deferred tax liabilities      
Property, plant and equipment 1,098 418  
Intangible assets 729 735  
Total deferred tax liabilities 1,827 1,153  
Net deferred tax assets 23,302 22,856  
Change in valuation allowances 1,695 2,712 $ 237
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 5,176 4,413  
Operating loss and tax credit carryforwards 8,591 8,578  
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 6,393 5,103  
Deferred tax liabilities      
Operating loss and tax credit carryforwards subject to expiration 1,200    
Operating loss and tax credit carryforwards not subject to expiration 5,200    
Germany, Spain and South Korea [Member]      
Deferred tax assets      
Less: valuation allowances $ (8,000) $ (6,700)