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Stockholders' Equity and Noncontrolling Interests Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 36,200 | $ 44,075
Other comprehensive loss, net of tax | $ (94) | $ (118) | (67) | (39)
Balance at end of period | 38,636 | 45,725 | 38,636 | 45,725
Foreign currency translation adjustments [Member] |  |  |  |
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (1,498) | (2,264) | (1,606) | (2,355)
Other comprehensive income and noncontrolling interests, net of reclassification adjustment, tax and impact of adoption of accounting standards | (328) | 102 | (220) | 193
Balance at end of period | (1,826) | (2,162) | (1,826) | (2,162)
Defined benefit plans [Member] |  |  |  |
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (6,524) | (6,997) | (6,398) | (6,968)
Other comprehensive loss before reclassification adjustment, net of tax and impact of adoption of accounting standards | 190 | (266) | 20 | (343)
Reclassification adjustment, net of tax | 44 | 55 | 88 | 103
Other comprehensive loss, net of tax | 234 | (211) | 108 | (240)
Balance at end of period | $ (6,290) | $ (7,208) | $ (6,290) | $ (7,208)

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