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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

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