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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Income Tax [Line Items]    
Unrecognized tax benefits   $ 7
Impact of unrecognized tax benefits if recognized   5
Accrued interest and penalties $ 1  
Jurisdictions statutes of limitations expiration period 12 months  
Minimum
    
Income Tax [Line Items]    
Foreign, U.S. state and local jurisdictions statutes of limitations 3 years  
Maximum
    
Income Tax [Line Items]    
Foreign, U.S. state and local jurisdictions statutes of limitations 4 years