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Investments (Mortgage Loans by Portfolio Segment) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Company-held mortgage loans held-for-investment, net        
Commercial mortgage loans $ 39,605 $ 40,472    
Percentage of loans receivable on commercial mortgage loans 71.20% 71.00%    
Agricultural mortgage loans 12,669 12,843    
Percentage of loans receivable on agricultural mortgage loans 22.80% 22.50%    
Residential mortgage loans 994 958    
Percentage of loans receivable on residential mortgage loans 1.80% 1.70%    
Subtotal 53,268 54,273    
Percentage of loans receivable on subtotal 95.80% 95.20%    
Valuation allowances (332) (347) (446) (481)
Percentage of loans receivable on valuation allowances (0.60%) (0.60%)    
Subtotal mortgage loans held-for-investment, net 52,936 53,926    
Percentage of loans receivable on subtotal mortgage loans held-for-investment, net 95.20% 94.60%    
Commercial mortgage loans held by consolidated securitization entities - fair value option 2,407 2,666    
Percentage of loans receivable on commercial mortgage loans held by consolidated securitization entities - fair value option 4.30% 4.70%    
Mortgage loans, at estimated fair value, relating to variable interest entities 55,343 56,592    
Percentage of loans receivable on mortgage loans, at estimated fair value 99.50% 99.30%    
Mortgage loans held-for-sale        
Residential mortgage loans - FVO 2 49    
Percentage of loans held for sale on residential mortgage loans - FVO 0.00% 0.10%    
Mortgage loans - lower of amortized cost or estimated fair value 269 365    
Percentage of loans held for sale on mortgage loans - lower of amortized cost or estimated fair value 0.50% 0.60%    
Held-for-sale, principally at estimated fair value (includes $2 and $49, respectively, under the fair value option) 271 414    
Percentage of loans held for sale on held-for-sale, principally at estimated fair value 0.50% 0.70%    
Total mortgage loans, net $ 55,614 $ 57,006    
Percentage of loans held for sale on total mortgage loans, net 100.00% 100.00%