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Investments (Details 3) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Company-held mortgage loans held-for-investment, net        
Commercial mortgage loans $ 40,472 $ 40,440    
Percentage of loans receivable on commercial mortgage loans 71.00% 56.10%    
Agricultural mortgage loans 12,843 13,129    
Percentage of loans receivable on agricultural mortgage loans 22.50% 18.20%    
Residential mortgage loans 958 689    
Percentage of loans receivable on residential mortgage loans 1.70% 1.00%    
Subtotal 54,273 54,258    
Percentage of loans receivable on subtotal 95.20% 75.30%    
Valuation allowances (347) (481) (664) (721)
Percentage of loans receivable on valuation allowances (0.60%) (0.70%)    
Subtotal mortgage loans held-for-investment, net 53,926 53,777    
Percentage of loans receivable on subtotal mortgage loans held-for-investment, net 94.60% 74.60%    
Commercial mortgage loans held by consolidated securitization entities - fair value option 2,666 3,138    
Percentage of loans receivable on commercial mortgage loans held by consolidated securitization entities - fair value option 4.70% 4.40%    
Mortgage loans, at estimated fair value, relating to variable interest entities 56,592 56,915    
Percentage of loans receivable on mortgage loans, at estimated fair value 99.30% 79.00%    
Mortgage loans held-for-sale        
Residential mortgage loans - FVO 49 3,064    
Percentage of loans held for sale on residential mortgage loans - FVO 0.10% 4.20%    
Mortgage loans - lower of amortized cost or estimated fair value 365 4,462    
Percentage of loans held for sale on mortgage loans - lower of amortized cost or estimated fair value 0.60% 6.20%    
Securitized reverse residential mortgage loans - fair value option 0 7,652    
Percentage of securitized reverse residential mortgage loans - fair value option 0.00% 10.60%    
Held-for-sale, principally at estimated fair value (includes $49 and $10,716, respectively, under the fair value option) 414 15,178    
Percentage of loans held for sale on held-for-sale, principally at estimated fair value 0.70% 21.00%    
Total mortgage loans, net $ 57,006 $ 72,093    
Percentage of loans held for sale on total mortgage loans, net 100.00% 100.00%