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Goodwill and Intangible Assets - Additional Information (Detail)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Brand
Goodwill and Intangible Assets Disclosure [Line Items]          
Amortization expense for intangible assets $ 45 $ 48 $ 137 $ 157  
Estimated amortization expense in year 1 184   184    
Estimated amortization expense in year 2 184   184    
Estimated amortization expense in year 3 184   184    
Estimated amortization expense in year 4 184   184    
Estimated amortization expense in year 5 184   184    
Number of brands | Brand         3
Intangible asset, aggregate book value $ 17,812   $ 17,812   $ 18,810
Weighted Average          
Goodwill and Intangible Assets Disclosure [Line Items]          
Life of our amortizable intangible assets (in years)     13 years 7 months 6 days    
Fair Value Over Book Value 10% or Less          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset, aggregate book value         341
Asia Pacific and Europe          
Goodwill and Intangible Assets Disclosure [Line Items]          
Asset impairment charges on intangible assets         $ 57