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Investments (Details 12) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution          
Total mortgage loans $ 4,264   $ 4,264   $ 5,943
Net carrying value of impaired mortgage loans          
Impaired mortgage loans with a valuation allowance 88   88   147
Impaired mortgage loans without a valuation allowance         8
Total impaired mortgage loans 88   88   155
Valuation allowance on impaired mortgage loans 25 47 25 47  
Rollforward of the valuation allowance on impaired mortgage loans          
Beginning balance 21 48 42 63  
Net increase (decrease) in valuation allowance 6 1 (11) (3)  
Charge offs   (2) (4) (13)  
Mortgage loans classified as held for sale (2)   (2)    
Ending balance 25 47 25 47  
Carrying value of past due mortgage loans          
Less than 90 days past due         20
90 days or greater past due 3   3   4
Total past due 3   3   24
Current loans 4,261   4,261   5,919
Total mortgage loans 4,264   4,264   5,943
Non-impaired mortgage loans
         
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution          
Fixed rate mortgage loans 4,061   4,061   5,642
Variable rate mortgage loans 115   115   146
Total mortgage loans 4,176   4,176   5,788
Non-impaired mortgage loans | Below 1.0
         
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution          
Fixed rate mortgage loans 146   146   266
Total mortgage loans 146   146   266
Non-impaired mortgage loans | 1.0 - 1.25
         
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution          
Fixed rate mortgage loans 658   658   1,158
Total mortgage loans 658   658   1,158
Non-impaired mortgage loans | 1.26 - 1.50
         
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution          
Fixed rate mortgage loans 969   969   1,364
Variable rate mortgage loans 3   3   17
Total mortgage loans 972   972   1,381
Non-impaired mortgage loans | Above 1.50
         
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution          
Fixed rate mortgage loans 2,288   2,288   2,854
Variable rate mortgage loans 112   112   129
Total mortgage loans 2,400   2,400   2,983
Mortgage loans
         
Average carrying value and interest income recognized on impaired mortgage loans          
Average balance impaired mortgage loans     $ 88 $ 214