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Summary of Principal Accounting Policies (Property) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Land $ 131 $ 142
Buildings 1,614 1,616
Machinery and equipment 7,982 8,182
Accumulated depreciation (5,953) (5,959)
Property, net $ 3,774 $ 3,981
Building | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plan, and equipment, useful life 10 years 10 years
Building | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plan, and equipment, useful life 50 years 50 years
Machinery and Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plan, and equipment, useful life 3 years 3 years
Machinery and Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plan, and equipment, useful life 25 years 25 years