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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Principles of Consolidation [Abstract]      
Investments accounted for using the equity method, minimum interest 20.00%    
Investments accounted for using the equity method, maximum interest 50.00%    
Equity method investments included in Other assets $ 34 $ 31  
Investments accounted for using the cost method, maximum interest 20.00%    
Shipping and Handling Costs [Abstract]      
Shipping and handling costs classified as Selling, general and administrative expenses $ 1,235 $ 1,326 $ 1,304
Inventories [Abstract]      
Approximate percentage of inventories determined using the first-in, first-out (FIFO) method 80.00%    
Minimum [Member] | Machinery and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 3 years    
Maximum [Member] | Machinery and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 15 years    
Maximum [Member] | Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 40 years