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Property (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property | $ 60,334 | $ 53,269 |
Less: accumulated depreciation | (24,081) | (20,666) |
Total property, net | 36,253 | 32,603 |
Depreciation, Amortization and Impairment [Abstract] |  |  |
Depreciation and amortization expense | 11,967 | 9,686 | $ 6,753
Property, Plant and Equipment [Member] |  |  |
Capitalized Interest and Software [Abstract] |  |  |
Capitalized Software, Net | 1,200 | 1,100 |
Depreciation, Amortization and Impairment [Abstract] |  |  |
Depreciation and amortization expense | 4,966 | 4,622 | 3,904
Impairment charges | 199 | 68 | 628
Capitalized software amortization expense | 459 | 458 | $ 374
Land [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property | 1,647 | 1,587 |
Buildings and Improvements [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property | $ 7,471 | 6,217 |
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 | $ 23,915 | 21,613 |
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 | $ 21,113 | 19,359 |
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 | $ 6,188 | $ 4,493 |

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