Statutory Net Income and Surplus and Dividend Restrictions (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statutory Net Income And Surplus And Dividend Restrictions [Abstract]
Statutory Net Income	$ 593	$ 169	$ 634
Statutory Surplus	2,796	2,656
Capacity for STAT Dividend	280
Statutory Dividend	$ 430	$ 748	$ 423