Property, Plant & Equipment (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Land	$ 133	$ 131
Buildings	1,650	1,614
Machinery and equipment	8,220	7,982
Accumulated depreciation	(6,261)	(5,953)
Property, plant and equipment, net	3,742	$ 3,774
Disposed of fully depreciated buildings, machinery and equipment	138
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment	$ 122