Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 11,741	$ 9,291
Accumulated depreciation	(5,369)	(5,066)
Property, plant, and equipment, net	6,372	4,225
Land and land improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	636	420
Buildings and improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	2,139	1,834
Machinery and other equipment
Property, Plant and Equipment
Property, plant and equipment, at cost	6,618	5,105
Capitalized software costs
Property, Plant and Equipment
Property, plant and equipment, at cost	603	537
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 1,745	$ 1,395
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	40 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