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Investments- Realized Capital Gains and Losses by Transaction Type (Details 5) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Investments [Abstract]        
Impairment write-downs $ (17) $ 2 $ (29) $ (2)
Change in intent write-downs (50) (21) (57) (40)
Net OTTI losses recognized in earnings (67) (19) (86) (42)
Sales and other 241 43 427 51
Valuation and settlements of derivative instruments 15 4 18 9
Total realized capital gains and losses 189 28 359 18
Fixed income securities        
Investments [Abstract]        
Net OTTI losses recognized in earnings (7) (3) (13) (3)
Total realized capital gains and losses 256 (1) 370 (1)
Schedule of Available for Sale Securities        
Gross gains on sales of fixed income securities 308 23 524 76
Gross losses on sales of fixed income securities $ 46 $ 5 $ 84 $ 34