Supplemental Data (Summary of Property, Plant and Equipment, Net) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Supplemental Data
Land	$ 163	$ 164
Buildings	2,612	2,537
Machinery and equipment	13,591	13,393
Construction in progress	488	453
Total before accumulated depreciation	16,854	16,547
Less accumulated depreciation	(9,685)	(9,443)
Total	$ 7,169	$ 7,104