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Equity (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended9 Months Ended
May 03, 2011
Share Repurchase Program [Member]
May 05, 2011
Accelerated Share Repurchase Program [Member]
Sep. 30, 2011
Accelerated Share Repurchase Program [Member]
May 10, 2011
Accelerated Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]    
Share repurchases, authorized amount$ 1,000$ 500  
Share repurchase authorization, shares, terminated amount10   
Cash payment for share repurchase under ASR program   500
Shares received from investment bank in initial delivery of shares repurchased   19.9
Percentage of shares held by investment bank pending settlement of accelerated share repurchase   20.00%
Value of shares held by investment bank pending settlement of accelerated share repurchase   100
Weighted average price of common stock  $ 17.62 
Additional shares owed to Company under ASR program based on volume weighted average price  8.4 
Adjustment to additional paid-in capital as a result of ASR holdback agreement  $ (100)