Insurance Premiums and Service Revenue Earned Insurance Premiums and Service Revenue Earned (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Insurance Premiums and Service Revenue Earned [Abstract]
Direct Premiums Written	$ 317	$ 313	$ 294
Direct Premiums Earned	318	296	282
Assumed Premiums Written	3	2	43
Assumed Premiums Earned	5	16	54
Premiums Written, Gross	320	315	337
Gross Insurance Premiums Earned	323	312	336
Ceded Premiums Written	(198)	(184)	(156)
Ceded Premiums Earned	(141)	(125)	(117)
Premiums Written, Net	122	131	181
Premiums Earned, Net, Property and Casualty	182	187	219
Insurance Commissions and Fees Written	826	846	842
Insurance Commissions and Fees	763	753	760
Insurance Services Revenue Written	948	977	1,023
Insurance Services Revenue	$ 945	$ 940	$ 979