Property, Plant and Equipment - Property, Plant and Equipment at Cost and Accumulated Depreciation (Details) - USD ($) $ in Millions	Dec. 31, 2017	Jan. 01, 2017
Property, Plant and Equipment, Net [Abstract]
Land and land improvements	$ 829	$ 753
Buildings and building equipment	11,240	10,112
Machinery and equipment	25,949	23,554
Construction in progress	3,448	3,354
Total property, plant and equipment, gross	41,466	37,773
Less accumulated depreciation	24,461	21,861
Total property, plant and equipment, net	$ 17,005	$ 15,912