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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period $ 42,777 $ 36,200 $ 44,075
Other comprehensive income (loss), net of tax (2,128) (936) 1,317
Balance at end of period 45,957 42,777 36,200
Discontinued Operations | Opel/Vauxhall Business [Member]      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Reclassification adjustment, net of tax     1,200
Foreign currency translation adjustments [Member]      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (2,250) (1,606) (2,355)
Other comprehensive income (loss) and noncontrolling interests before reclassification adjustment, net of tax and impact of adoption of accounting standards (56) (664) 560
Reclassification adjustment, net of tax 28 20 189
Other comprehensive income (loss), net of tax (28) (644) 749
Balance at end of period (2,278) (2,250) (1,606)
Defined benefit plans attributable [Member]      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (6,737) (6,398) (6,968)
Other comprehensive loss and noncontrolling interests before reclassification adjustment, net of impact of adoption of accounting standards (2,769) (580) (798)
Tax benefit 463 100 98
Other comprehensive income (loss) before reclassification adjustment, net of tax (2,306) (480) (700)
Reclassification adjustment, net of tax 184 141 1,270
Other comprehensive income (loss), net of tax (2,122) (339) 570
Balance at end of period $ (8,859) $ (6,737) $ (6,398)