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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Brand
Goodwill and Intangible Assets Disclosure [Line Items]          
Amortization expense for intangible assets $ 55 $ 55 $ 109 $ 109  
Estimated amortization expense for each of the next five years     217    
Number of brands         7
Intangible asset, aggregate book value 20,236   20,236   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