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Goodwill and Intangible Assets - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Brand
Mar. 31, 2016
USD ($)
Goodwill and Intangible Assets Disclosure [Line Items]      
Amortization expense for intangible assets $ 44   $ 44
Estimated amortization expense in year 1 155    
Estimated amortization expense in year 2 155    
Estimated amortization expense in year 3 155    
Estimated amortization expense in year 4 155    
Estimated amortization expense in year 5 155    
Number of brands | Brand   5  
Intangible asset, aggregate book value $ 17,229 $ 17,004  
Trademarks      
Goodwill and Intangible Assets Disclosure [Line Items]      
Intangible asset impairment   98  
Intangible asset, aggregate book value   $ 630  
Weighted Average      
Goodwill and Intangible Assets Disclosure [Line Items]      
Life of our amortizable intangible assets (in years) 13 years 6 months