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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Brand
Goodwill and Intangible Assets Disclosure [Line Items]          
Amortization expense for intangible assets $ 48 $ 55 $ 157 $ 164  
Estimated amortization expense in year 1 200   200    
Estimated amortization expense in year 2 200   200    
Estimated amortization expense in year 3 200   200    
Estimated amortization expense in year 4 200   200    
Estimated amortization expense in year 5 200   200    
Number of brands         7
Intangible asset, aggregate book value 19,460   19,460   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 4 months 24 days