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Stockholders' Equity and Noncontrolling Interests Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period $ (8,011)    
Other comprehensive income (loss), net of tax (936) $ 1,317 $ (1,353)
Balance at end of period (9,039) (8,011)  
Foreign currency translation adjustments [Member]      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (1,606) (2,355) (2,034)
Other comprehensive income (loss) before reclassification adjustment, net of tax (664) 560 (317)
Reclassification adjustment, net of tax 20 189 (4)
Other comprehensive income (loss), net of tax (644) 749 (321)
Balance at end of period (2,250) (1,606) (2,355)
Defined benefit plans attributable [Member]      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (6,398) (6,968) (5,999)
Other comprehensive loss and noncontrolling interests before reclassification adjustment, net of impact of adoption of accounting standards (580) (798) (1,546)
Tax benefit 100 98 459
Other comprehensive income (loss) before reclassification adjustment, net of tax (480) (700) (1,087)
Reclassification adjustment, net of tax 141 1,270 118
Other comprehensive income (loss), net of tax (339) 570 (969)
Balance at end of period $ (6,737) (6,398) $ (6,968)
Defined benefit plans attributable [Member] | Discontinued Operations [Member] | Opel/Vauxhall Business [Member]      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Reclassification adjustment, net of tax   $ 1,200