Statutory Net Income and Surplus and Dividend Restrictions (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statutory Net Income And Surplus And Dividend Restrictions [Abstract]
Statutory Net Income	$ 578	$ 593	$ 169
Statutory Surplus	1,250	2,796
Capacity for STAT Dividend	125
Statutory Dividend	$ 2,593	$ 430	$ 748