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Investments (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 $ (47) $ 10 $ (77) $ (12)
Change in intent write-downs (127) (63) (189) (167)
Net OTTI losses recognized in earnings (174) (53) (266) (179)
Sales and other 183 355 545 792
Valuation and settlements of derivative instruments 24 (8) 1 (25)
Total realized capital gains and losses 33 294 280 588
Fixed income and equity securities        
Schedule of Available for Sale Securities        
Gross gains on sales of fixed income securities 357 353 828 866
Gross loss on sales of fixed income securities $ 120 $ 48 $ 241 $ 111