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Stockholders' Equity and Noncontrolling Interests Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period     $ 36,200 $ 44,075
Other comprehensive income (loss), net of tax $ (150) $ 1,584 (217) 1,545
Balance at end of period 40,908 43,477 40,908 43,477
Foreign currency translation adjustments [Member]        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period (1,826) (2,162) (1,606) (2,355)
Other comprehensive income (loss) and noncontrolling interests, net of reclassification adjustment, tax and impact of adoption of accounting standards (215) 370 (435) 563
Balance at end of period (2,041) (1,792) (2,041) (1,792)
Defined benefit plans [Member]        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period (6,290) (7,208) (6,398) (6,968)
Other comprehensive income (loss) before reclassification adjustment, net of tax and impact of adoption of accounting standards (4) 87 16 (256)
Reclassification adjustment, net of tax 63 1,126 151 1,229
Other comprehensive income (loss), net of tax 59 1,213 167 973
Balance at end of period $ (6,231) (5,995) $ (6,231) (5,995)
Opel/Vauxhall Business [Member] | Discontinued Operations [Member] | Defined benefit plans [Member]        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Reclassification adjustment, net of tax   $ 1,200   $ 1,200