Statutory Net Income and Surplus and Dividend Restrictions (Details) - USD ($) $ in Millions							12 Months Ended
	Dec. 22, 2015	Jun. 29, 2015	Dec. 19, 2014	Jun. 27, 2014	Dec. 16, 2013	Jun. 26, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statutory Net Income And Surplus And Dividend Restrictions [Abstract]
Statutory net income							$ 340	$ 393	$ 406
Statutory surplus balance							482	$ 606
Statutory dividend							$ 48
Distribution to parent	$ 180	$ 270	$ 75	$ 267	$ 100	$ 184