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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Brand
Goodwill and Intangible Assets Disclosure [Line Items]      
Amortization expense for intangible assets $ 54 $ 54  
Estimated amortization expense for each of the next five years 217    
Number of brands     7
Intangible asset, aggregate book value 20,111   20,067
Fair Value Over Book Value 10% or Less
      
Goodwill and Intangible Assets Disclosure [Line Items]      
Intangible asset, aggregate book value     $ 511
Weighted Average
      
Goodwill and Intangible Assets Disclosure [Line Items]      
Life of our amortizable intangible assets (in years) 13 years 3 months 18 days