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Investments-Carrying Value of Non-impaired Fixed Rate and Variable Rate Morgage Loans (Details 13) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution            
Total         $ 3,827 $ 3,686
Net carrying value of impaired mortgage loans            
Impaired mortgage loans with a valuation allowance         9 16
Impaired mortgage loans without a valuation allowance         0 0
Total impaired mortgage loans         9 16
Valuation allowance on impaired mortgage loans $ 7 $ 9 $ 8 $ 21 7 8
Rollforward of the valuation allowance on impaired mortgage loans            
Beginning balance 7 9 8 21    
Net decrease in valuation allowance 0 (2) 0 (6)    
Charge offs 0 0 (1) (8)    
Ending balance $ 7 $ 7 7 7    
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         3,817 3,669
Variable rate mortgage loans         1 1
Total         3,818 3,670
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         97 110
Variable rate mortgage loans         0 0
Total         97 110
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         381 387
Variable rate mortgage loans         0 0
Total         381 387
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         1,173 1,118
Variable rate mortgage loans         0 1
Total         1,173 1,119
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         2,166 2,054
Variable rate mortgage loans         1 0
Total         $ 2,167 $ 2,054
Mortgage loans            
Average carrying value and interest income recognized on impaired mortgage loans            
Average balance impaired mortgage loans     $ 12 $ 29