Supplemental Balance Sheet Information - PP&E (Details) - USD ($) $ in Millions |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Property, plant and equipment - at cost | ||
| Gross property, plant and equipment | $ 23,499 | $ 23,098 |
| Less: Accumulated depreciation | (14,983) | (14,583) |
| Property, Plant and Equipment - net | 8,516 | 8,515 |
| Accumulated depreciation for capital leases included in Accumulated depreciation | 89 | 98 |
| Land | ||
| Property, plant and equipment - at cost | ||
| Gross property, plant and equipment | 341 | 354 |
| Buildings and leasehold improvements | ||
| Property, plant and equipment - at cost | ||
| Gross property, plant and equipment | 7,252 | 7,120 |
| Machinery and equipment | ||
| Property, plant and equipment - at cost | ||
| Gross property, plant and equipment | 14,935 | 14,743 |
| Construction in progress | ||
| Property, plant and equipment - at cost | ||
| Gross property, plant and equipment | 809 | 723 |
| Capital leases | ||
| Property, plant and equipment - at cost | ||
| Gross property, plant and equipment | $ 162 | $ 158 |