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Investments (Commercial Mortgage and Other Loans) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Total commercial mortgage and other loans $ 35,431 [1] $ 31,831 [1]
Office buildings [Member]
   
Commercial mortgage loans 6,391 5,803
Commercial mortgage loans, Percentage 19.80% 19.50%
Retail stores [Member]
   
Commercial mortgage loans 7,309 6,388
Commercial mortgage loans, Percentage 22.70% 21.40%
Apartment Complexes [Member]
   
Commercial mortgage loans 5,277 5,140
Commercial mortgage loans, Percentage 16.40% 17.20%
Industrial Buildings [Member]
   
Commercial mortgage loans 7,049 6,576
Commercial mortgage loans, Percentage 21.80% 22.10%
Agricultural Properties [Member]
   
Commercial mortgage loans 2,046 1,893
Commercial mortgage loans, Percentage 6.30% 6.30%
Hospitality [Member]
   
Commercial mortgage loans 1,486 1,584
Commercial mortgage loans, Percentage 4.60% 5.30%
Other [Member]
   
Commercial mortgage loans 2,707 2,440
Commercial mortgage loans, Percentage 8.40% 8.20%
Commercial Mortgage Loan [Member]
   
Commercial mortgage loans 30,219 27,931
Commercial mortgage loans, Percentage 93.70% 93.70%
Commercial Mortgage Loan [Member] | Agricultural Properties [Member]
   
Commercial mortgage loans 32,265 29,824
Commercial mortgage loans, Percentage 100.00% 100.00%
Total net commercial and agricultural mortgage loans by property type 31,952 29,319
Valuation allowance 313 505
Uncollateralized Loans [Member]
   
Total other loans 2,323 1,468
Residential Property Loan [Member]
   
Total other loans 1,034 891
Other Collateralized Loans [Member]
   
Total other loans 176 223
Total Other Loans [Member]
   
Total other loans 3,533 2,582
Valuation allowance 54 70
Total net other loans $ 3,479 $ 2,512
[1] Includes loans held at fair value.