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Summary of Principle Accounting Policies (Property) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Land $ 123 $ 128
Buildings 1,789 1,652
Machinery and equipment 8,946 8,085
Accumulated depreciation (6,825) (6,055)
Property plant and equipment, net $ 4,033 $ 3,810
Buildings | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plan, and equipment, useful life 10 years  
Buildings | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plan, and equipment, useful life 50 years  
Machinery and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plan, and equipment, useful life 3 years  
Machinery and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plan, and equipment, useful life 30 years