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Stock Transactions (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Equity, Class of Treasury Stock [Line Items]      
Treasury Stock Acquired, Average Cost Per Share $ 55.49    
Treasury Stock Value Acquired Cost Method $ (6,924,000) $ (380,345,000) $ (718,000)
Treasury Stock Value Acquired Cost Method Repurchase Agreement   43,100,000  
Accelerated Share Repurchases [Line Items]      
Shares Granted To Non Employee Directors 14,200    
Warrants Excercised   4,402,078  
Price Per Warrant   $ 35.44  
Stock Issued During Period Shares Conversion Of Units   5,506,088  
Incentive Award Tax Settlement [Member]
      
Equity, Class of Treasury Stock [Line Items]      
Stock Issued During Period, Shares, Treasury Stock Reissued 369,466    
Treasury Stock, Shares, Acquired 124,781    
Met Life Inc [Member]
      
Equity, Class of Treasury Stock [Line Items]      
Treasury Stock, Shares, Acquired   3,000,000  
Treasury Stock Acquired, Average Cost Per Share   $ 61.14  
Repurchase Program 2002 [Member]
      
Equity, Class of Treasury Stock [Line Items]      
Treasury Stock, Shares, Acquired   838,362  
Stock Repurchase Program, Remaining Authorized Repurchase Amount   300,000 43,400,000
Accelerated Share Repurchase [Member]
      
Equity, Class of Treasury Stock [Line Items]      
Treasury Stock, Shares, Acquired   2,500,000  
Treasury Stock Acquired, Average Cost Per Share   $ 51.39  
Accelerated Share Repurchases [Line Items]      
Accelerated Share Repurchases, Initial Price Paid Per Share   $ 59.76  
Accelerated Share Repurchases, Settlement Payment or Receipt   $ 149,400,000  
Accelerated Share Repurchases, Final Price Paid Per Share   $ 61.47