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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended3 Months Ended9 Months Ended1 Months Ended9 Months Ended
Feb. 28, 2011
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
May 19, 2011
Feb. 22, 2011
May 31, 2011
Non Employee [Member]
Sep. 30, 2011
Restricted Stock And Restricted Stock Units [Member]
Sep. 30, 2011
Restricted stock [Member]
Sep. 30, 2011
Performance-base restricted stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]           
Restricted stock granted234,620      8,505374,425 131,300
Period of option vested over grant date   Options generally vest over a three-year period from the grant date     Restricted stock awards vest on the third anniversary of the date of grant 
Stock option granted2,255,322  2,277,946   22,624   
Stock-Based Compensation (Textuals) [Abstract]           
Earlier authorized shares under stock based compensation   25,500,000       
Remaining shares available for future grants under the Plan 5,702,740 5,702,740       
Total stock-based compensation compensation arrangements under the Plan $ 19$ 17$ 55$ 50      
Total income tax benefit stock-based compensation arrangements under the Plan $ 6$ 5$ 17$ 15      
Stock options granted, exercise price     $ 67.93$ 79.80    
Performance based restricted stock awards grants in period percent   100.00%       
The performance based restricted stock awards vested, number of months   36 months