Life Policy And Investment Contract Reservess (Reserve In Addition To The Account Balance Based On Expected No-Lapse Guarantee Benefits And Expected Policy Assessments) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	$ 2,583	$ 2,497
Ordinary/Traditional Life
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	943	875
Deferred Annuities
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	860	863
Universal Life
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	558	530
Structured Settlements
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	174	182
Other
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	$ 48	$ 47