Investments- Rollforward of Cumulative Credit Losses (Details 8) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Credit Losses on Fixed Income Securities
Beginning balance	$ (207)	$ (293)	$ (209)	$ (299)
Additional credit loss for securities previously other-than-temporarily impaired	(1)	3	(2)	2
Additional credit loss for securities not previously other-than-temporarily impaired	(2)	(1)	(4)	(1)
Reduction in credit loss for securities disposed or collected	3	3	7	10
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	0	0
Change in credit loss due to accretion of increase in cash flows	1	0	2	0
Ending balance	(206)	(229)	(206)	(229)
Linco in Benefit Life Company [Member]
Credit Losses on Fixed Income Securities
Reduction in credit loss for securities disposed or collected	$ 0	$ 59	$ 0	$ 59