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Property, Plant and Equipment (Schedule of Property, Plant And Equipment) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 31,826 $ 32,761
Building [Member]
   
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 5,490 5,297
Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 24,090 25,338
Land [Member]
   
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 691 669
Construction in Progress [Member]
   
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 1,555 $ 1,457