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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)

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