Investments (Details 8) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Credit Losses on Fixed Income Securities
Beginning balance	$ (380)	$ (513)	$ (617)
Additional credit loss for securities previously other-than-temporarily impaired	(30)	(6)	(30)
Additional credit loss for securities not previously other-than-temporarily impaired	(45)	(18)	(19)
Reduction in credit loss for securities disposed or collected	60	95	150
Reduction in credit loss for securities the Company has made the decision to sell or more likely than not will be required to sell	0	0	2
Change in credit loss due to accretion of increase in cash flows	3	3	1
Reduction in credit loss for securities sold in LBL disposition	0	59	0
Ending balance	$ (392)	$ (380)	$ (513)