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Investments (Details 8) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Credit Losses on Fixed Income Securities        
Beginning balance $ (281) $ (331) $ (318) $ (392)
Additional credit loss for securities previously other-than-temporarily impaired (3) (3) (15) (14)
Additional credit loss for securities not previously other-than-temporarily impaired 0 (14) (8) (22)
Reduction in credit loss for securities disposed or collected 20 12 76 92
Change in credit loss due to accretion of increase in cash flows 0 0 1 0
Ending balance $ (264) $ (336) $ (264) $ (336)