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Property (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property | $ 65,483 | $ 60,334 |
Less: accumulated depreciation | (26,725) | (24,081) |
Total property, net | 38,758 | 36,253 |
Depreciation, Amortization and Impairment [Abstract] |  |  |
Depreciation and amortization expense | 13,142 | 11,967 | $ 9,686
Property, Plant and Equipment [Member] |  |  |
Capitalized Interest and Software [Abstract] |  |  |
Capitalized Software, Net | 1,100 | 1,200 |
Depreciation, Amortization and Impairment [Abstract] |  |  |
Depreciation and amortization expense | 5,347 | 4,966 | 4,622
Impairment charges | 466 | 199 | 68
Capitalized software amortization expense | 424 | 459 | $ 458
Land [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property | 1,349 | 1,647 |
Buildings and Improvements [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property | $ 9,173 | 7,471 |
Buildings and Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Estimated Useful Life in Years | 5 years |  |
Buildings and Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Estimated Useful Life in Years | 40 years |  |
Machinery and Equipment [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property | $ 26,453 | 23,915 |
Machinery and Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Estimated Useful Life in Years | 3 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Estimated Useful Life in Years | 27 years |  |
Special Tools [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property | $ 23,828 | 21,113 |
Special Tools [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Estimated Useful Life in Years | 1 year |  |
Special Tools [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Estimated Useful Life in Years | 13 years |  |
Construction in Progress [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property | $ 4,680 | $ 6,188 |

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