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Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Jurisdictions
Dec. 31, 2012
Dec. 31, 2011
Summary Of Accounting Policies [Line Items]      
Cumulative probability threshold for realization of income tax benefits 50.00%    
Minimum recognizable tax benefit 50.00%    
Sustainability threshold for uncertain tax position 50.00%    
Advertising expenses $ 11 $ 12 $ 12
Unrecognized tax benefits $ 229    
Number of tax jurisdictions 4    
Minimum [Member]
      
Summary Of Accounting Policies [Line Items]      
Equity investments, Ownership percentage 20.00%    
Maximum [Member]
      
Summary Of Accounting Policies [Line Items]      
Equity investments, Ownership percentage 50.00%    
Capitalized Software [Member]
      
Summary Of Accounting Policies [Line Items]      
Estimated useful lives of intangible assets, maximum 4 years    
Trademarks and Licenses [Member] | Minimum [Member]
      
Summary Of Accounting Policies [Line Items]      
Estimated useful lives of intangible assets, maximum 3 years    
Trademarks and Licenses [Member] | Maximum [Member]
      
Summary Of Accounting Policies [Line Items]      
Estimated useful lives of intangible assets, maximum 7 years