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Investments and Derivative Instruments (Details 6) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2009
Schedule of Available-for-sale Securities Mortgage Loans [Line Items]        
Amortized Cost $ 5,475 $ 4,644    
Valuation Allowance (171) (155) (340) (366)
Carrying Value 5,304 4,489    
Commercial [Member]
       
Schedule of Available-for-sale Securities Mortgage Loans [Line Items]        
Amortized Cost 5,324 4,492    
Valuation Allowance (129) (152)    
Carrying Value 5,195 4,340    
Residential [Member]
       
Schedule of Available-for-sale Securities Mortgage Loans [Line Items]        
Amortized Cost 151 152    
Valuation Allowance (42) (3)    
Carrying Value $ 109 $ 149