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Fair Value of Assets and Liabilities (Details 6) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Financial assets        
Mortgage loans $ 6,413 $ 6,570    
Financial liabilities        
Short-term debt 500      
Long-term debt 5,475 6,057    
Liability for collateral 692 808 665 462
Carrying value
       
Financial assets        
Mortgage loans 6,413 6,570    
Cost method limited partnerships 1,441 1,406    
Bank loans 991 682    
Agent loans 321 319    
Financial liabilities        
Contract holder funds on investment contracts 24,018 27,014    
Short-term debt 500      
Long-term debt 5,475 6,057    
Liability for collateral 692 808    
Fair Value
       
Financial assets        
Mortgage loans 6,691 6,886    
Cost method limited partnerships 1,795 1,714    
Bank loans 987 684    
Agent loans 306 314    
Financial liabilities        
Contract holder funds on investment contracts 24,675 28,019    
Short-term debt 500      
Long-term debt 6,037 7,141    
Liability for collateral $ 692 $ 808