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Investments (Details 30) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Company-held mortgage loans held-for-investment, net            
Commercial mortgage loans $ 41,941   $ 40,440      
Percentage of loans receivable on commercial mortgage loans 70.90%   56.10%      
Agricultural mortgage loans 12,600   13,129      
Percentage of loans receivable on agricultural mortgage loans 21.30%   18.20%      
Residential mortgage loans 818   689      
Percentage of loans receivable on residential mortgage loans 1.40%   1.00%      
Subtotal 55,359   54,258      
Percentage of loans receivable on subtotal 93.60%   75.30%      
Valuation allowances (354) (361) (481) (529) (566) (664)
Percentage of loans receivable on valuation allowances (0.60%)   (0.70%)      
Subtotal mortgage loans held-for-investment, net 55,005   53,777      
Percentage of loans receivable on subtotal mortgage loans held-for-investment, net 93.00%   74.60%      
Commercial mortgage loans held by consolidated securitization entities - fair value option 2,879   3,138      
Percentage of loans receivable on commercial mortgage loans held by consolidated securitization entities - fair value option 4.90%   4.40%      
Mortgage loans, at estimated fair value, relating to variable interest entities 57,884   56,915      
Percentage of loans receivable on mortgage loans, at estimated fair value, relating to variable interest entities 97.90%   79.00%      
Mortgage loans held-for-sale            
Residential mortgage loans - FVO 64   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 1,222   4,462      
Percentage of loans held for sale on mortgage loans - lower of amortized cost or estimated fair value 2.00%   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 $64 and $10,716, respectively, under the fair value option) 1,286   15,178      
Percentage of loans held for sale on held-for-sale, principally at estimated fair value 2.10%   21.00%      
Total mortgage loans, net $ 59,170   $ 72,093      
Percentage of loans held for sale on total mortgage loans, net 100.00%   100.00%