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Equity (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended 6 Months Ended
May 03, 2011
Share Repurchase Program [Member]
May 05, 2011
Accelerated Share Repurchase Program [Member]
Jun. 30, 2011
Accelerated Share Repurchase Program [Member]
May 10, 2011
Accelerated Share Repurchase Program [Member]
Share repurchases, authorized amount $ 1,000 $ 500    
Share repurchase authorization, shares, terminated amount 10      
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     $ 20.07  
Additional shares owed to Company under ASR program based on volume weighted average price     5.0  
Adjustment to additional paid-in capital as a result of ASR holdback agreement     $ (100)