v2.4.0.6
Stock-Based Compensation Schedule of Non-qualified Stock Option Activity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Options, Outstanding 18,002,150 17,665,902
Options, Outstanding, Weighted Average Exercise Price $ 17.29 $ 17.32
Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 3 months 18 days 4 years 9 months 18 days
Options, Outstanding, Intrinsic Value $ 35 $ 26
Options, Grants in Period, Gross 898,115  
Options, Grants in Period, Weighted Average Exercise Price $ 15.35  
Options, Exercises in Period 276,300  
Options, Exercises in Period, Weighted Average Exercise Price $ 15.16  
Options, Forfeitures in Period 171,267  
Options, Forfeitures in Period, Weighted Average Exercise Price $ 13.17  
Options, Expirations in Period 114,300  
Options, Expirations in Period, Weighted Average Exercise Price $ 17.72  
Options, Exercisable 10,356,198  
Options, Exercisable, Weighted Average Exercise Price $ 19.13  
Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 9 months 18 days  
Options, Exercisable, Intrinsic Value 9  
Options, Vested and Expected to Vest, Outstanding 17,668,022  
Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 17.34  
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 4 years 2 months 12 days  
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 34