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Stock Compensation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Month
Mar. 31, 2011
Compensation Related Costs Share Based Payments Disclosure [Line Items]    
Stock options and SARs exercised, number of shares 0.3  
Stock options and SARs forfeited, number of shares 0.1  
Stock compensation expense $ 7 $ 3
Period in which the total unrecognized compensation cost is expected to be recognized 31  
Total unrecognized compensation cost related to the nonvested portions of all stock based awards granted and expected to vest 29  
Weighted-average period in which the total unrecognized compensation cost is expected to be recognized 2 years 1 month  
Omnibus Incentive Plan 2008
   
Compensation Related Costs Share Based Payments Disclosure [Line Items]    
Number of shares of common stock that may be issued or delivered 1.9  
Maximum
   
Compensation Related Costs Share Based Payments Disclosure [Line Items]    
Cash received from the exercise of stock options 1  
Cash paid to settle SARs $ 1  
Maximum | Omnibus Incentive Plan 2012
   
Compensation Related Costs Share Based Payments Disclosure [Line Items]    
Number of shares of common stock that may be issued or delivered 5.0