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Fair Value of Assets and Liabilities (Details 5) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Dec. 31, 2009
Financial assets    
Mortgage loans$ 6,956$ 6,679  
Financial liabilities    
Long-term debt5,9075,908  
Liability for collateral784484469658
Carrying value
    
Financial assets    
Mortgage loans6,9566,679  
Limited partnership interests - cost basis1,4451,348  
Bank loans362363  
Financial liabilities    
Contractholder funds on investment contracts31,73736,163  
Long-term debt5,9075,908  
Liability for collateral784484  
Fair Value
    
Financial assets    
Mortgage loans6,9896,439  
Limited partnership interests - cost basis1,7681,481  
Bank loans345355  
Financial liabilities    
Contractholder funds on investment contracts31,99935,194  
Long-term debt6,2846,325  
Liability for collateral$ 784$ 484