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Investments (Mortgage Loans by Portfolio Segment) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Company-held mortgage loans held-for-investment, net            
Commercial mortgage loans $ 39,110   $ 40,472      
Percentage of loans receivable on commercial mortgage loans 70.30%   71.00%      
Agricultural mortgage loans 12,669   12,843      
Percentage of loans receivable on agricultural mortgage loans 22.80%   22.50%      
Residential mortgage loans 1,741   958      
Percentage of loans receivable on residential mortgage loans 3.10%   1.70%      
Subtotal 53,520   54,273      
Percentage of loans receivable on subtotal 96.20%   95.20%      
Valuation allowances (302) (332) (347) (361) (446) (481)
Percentage of loans receivable on valuation allowances (0.50%)   (0.60%)      
Subtotal mortgage loans held-for-investment, net 53,218   53,926      
Percentage of loans receivable on subtotal mortgage loans held-for-investment, net 95.70%   94.60%      
Residential - FVO 150   0      
Percentage of residential mortgage loans - FVO 0.20%   0.00%      
Commercial mortgage loans held by consolidated securitization entities - fair value option 2,268   2,666      
Percentage of loans receivable on commercial mortgage loans held by consolidated securitization entities - fair value option 4.10%   4.70%      
Mortgage loans, at estimated fair value, relating to variable interest entities 55,636   56,592      
Percentage of loans receivable on mortgage loans, at estimated fair value 100.00%   99.30%      
Mortgage loans held-for-sale            
Held-for-sale, principally at estimated fair value (includes $0 and $49, respectively, under the fair value option) 0   414      
Percentage of loans held for sale on held-for-sale, principally at estimated fair value 0.00%   0.70%      
Total mortgage loans, net $ 55,636   $ 57,006      
Percentage of loans held for sale on total mortgage loans, net 100.00%   100.00%