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Stockholders' Equity Repurchase Program (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2008
Repurchase Program [Abstract]    
Stock Repurchase Program, Authorized Amount   $ 500
Stock Repurchased During Period, Shares 241  
Stock Repurchased During Period, Value 30  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 320