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Stock Compensation - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options and SARs exercised, number of shares 0.2  
Cash received from the exercise of stock options $ 1  
Cash paid to settle SARs and performance share units 2  
Stock compensation expense 5 7
Total unrecognized compensation cost related to the nonvested portions of all stock based awards granted and expected to vest $ 28  
Weighted-average period in which the total unrecognized compensation cost is expected to be recognized 2 years 3 months 18 days  
RSUs
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued 0.1  
Performance Share Units
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued 0.4