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Investments (Details 5) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Investments [Abstract]        
Impairment write-downs $ (23) $ (63) $ (94) $ (185)
Change in intent write-downs (5) (10) (43) (48)
Net OTTI losses recognized in earnings (28) (73) (137) (233)
Sales and other 148 121 495 166
Valuation and settlements of derivative instruments (17) (15) (40) (25)
Total realized capital gains and losses 103 33 318 (92)
Fixed income and equity securities        
Schedule of Available for Sale Securities        
Gross gains on sales of fixed income securities 145 150 521 456
Gross loss on sales of fixed income securities $ 36 $ 62 $ 161 $ 347