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Equity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share repurchases        
Average price paid per share $ 0.00 $ 40.10 $ 0.00 $ 38.96
Total cash utilized $ 0 $ 177 $ 0 $ 300
2011 Repurchase Program [Member]
       
Share repurchases        
Total number of shares purchased 0.1 0 0.9 0
2007 Repurchase Program [Member]
       
Share repurchases        
Total number of shares purchased 0 4.4 0 7.7