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Summary of Principal Accounting Policies (Property) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Land 142us-gaap_Land $ 76us-gaap_Land
Buildings 1,616us-gaap_BuildingsAndImprovementsGross 1,303us-gaap_BuildingsAndImprovementsGross
Machinery and equipment 8,182us-gaap_MachineryAndEquipmentGross 7,940us-gaap_MachineryAndEquipmentGross
Accumulated depreciation (5,959)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (6,278)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, net 3,981us-gaap_PropertyPlantAndEquipmentNet $ 3,041us-gaap_PropertyPlantAndEquipmentNet
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 25 years