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Fair Value (Details Textuals) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Fair Value (Textuals) [Abstract]          
Other changes in estimated fair value affecting MSRs $ 0 $ 0 $ 0 $ 0  
Call options in equity securities (103)   (103)   (72)
Call options in fixed maturity securities 0   0   2
Transfers between Levels 1 and 2 0 0 12 0  
Level 2 to Level 1 transfers 0 0 0 0  
Minimum [Member]
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Liquidation period for other limited partnership interests     2 years    
Liquidation period for real estate joint venture commitments     2 years    
Maximum [Member]
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Liquidation period for other limited partnership interests     10 years    
Liquidation period for real estate joint venture commitments     10 years    
Non Recurring [Member] | Other limited partnership interests [Member]
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Unfunded commitment for investments 5 1 5 1  
Non Recurring [Member] | Real estate joint ventures [Member]
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Unfunded commitment for investments $ 7 $ 0 $ 7 $ 0