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Summary of Principal Accounting Policies (Property) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Building
Minimum
Dec. 31, 2013
Building
Maximum
Dec. 31, 2013
Machinery and Equipment
Minimum
Dec. 31, 2013
Machinery and Equipment
Maximum
Property, Plant and Equipment [Line Items]            
Land $ 76 $ 74        
Buildings 1,303 1,252        
Machinery and equipment 7,940 7,778        
Accumulated depreciation (6,278) (6,070)        
Property, net $ 3,041 $ 3,034        
Property, Plant and Equipment, Useful Life     25 years 50 years 3 years 25 years