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Supplemental Balance Sheet Information - PP&E (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Property, plant and equipment - at cost |  |
Gross property, plant and equipment | $ 24,914 | $ 23,499
Less: Accumulated depreciation | (16,048) | (14,983)
Property, Plant and Equipment - net | 8,866 | 8,516
Accumulated depreciation for capital leases included in Accumulated depreciation | 48 | 89
Land |  |
Property, plant and equipment - at cost |  |
Gross property, plant and equipment | 348 | 341
Buildings and leasehold improvements |  |
Property, plant and equipment - at cost |  |
Gross property, plant and equipment | 7,681 | 7,252
Machinery and equipment |  |
Property, plant and equipment - at cost |  |
Gross property, plant and equipment | 15,907 | 14,935
Construction in progress |  |
Property, plant and equipment - at cost |  |
Gross property, plant and equipment | 843 | 809
Capital leases |  |
Property, plant and equipment - at cost |  |
Gross property, plant and equipment | $ 135 | $ 162

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