Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 8,419	$ 7,913
Accumulated depreciation	(4,831)	(4,849)
Property, plant, and equipment, net	3,588	3,064
Land and land improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	415	381
Buildings and improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	1,798	1,618
Machinery and other equipment
Property, Plant and Equipment
Property, plant and equipment, at cost	4,711	4,610
Capitalized software costs
Property, Plant and Equipment
Property, plant and equipment, at cost	439	406
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 1,056	$ 898
Minimum | Capitalized software costs
Property, Plant and Equipment
Property, plant and equipment, estimated useful life	3 years
Maximum | Land and land improvements
Property, Plant and Equipment
Property, plant and equipment, estimated useful life	40 years
Maximum | Buildings and improvements
Property, Plant and Equipment
Property, plant and equipment, estimated useful life	45 years
Maximum | Machinery and other equipment
Property, Plant and Equipment
Property, plant and equipment, estimated useful life	20 years
Maximum | Capitalized software costs
Property, Plant and Equipment
Property, plant and equipment, estimated useful life	5 years