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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Principles of Consolidation [Abstract]      
Investments accounted for using the equity method, minimum interest (in hundredths) 20.00%    
Investments accounted for using the equity method, maximum interest (in hundredths) 50.00%    
Equity method investments included in Other assets $ 20 $ 17  
Investments accounted for using the cost method, maximum interest (in hundredths) 20.00%    
Shipping and Handling Costs [Abstract]      
Shipping and handling costs classified as Selling, general and administrative expenses $ 1,250 $ 1,142 $ 1,116
Inventories [Abstract]      
Approximate percentage of inventories determined using the first-in, first-out (FIFO) method (in hundredths) 80.00%    
Machinery and equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Minimum estimated useful life (in years) 3    
Maximum estimated useful life (in years) 15    
Buildings [Member]
     
Property, Plant and Equipment [Line Items]      
Maximum estimated useful life (in years) 40