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Summary of Principal Accounting Policies (Property) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Land $ 128 $ 131
Buildings 1,652 1,614
Machinery and equipment 8,085 7,982
Accumulated depreciation (6,055) (5,953)
Property plant and equipment, net $ 3,810 $ 3,774
Building | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plan, and equipment, useful life 10 years  
Building | 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