Insurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statutory Accounting Practices [Line Items]
Assets Held by Insurance Regulators	$ 12	$ 13
Insurance Expenses [Abstract]
Insurance losses	80	115	$ 70
Loss adjustment expenses	5	6	6
Reinsurance Income and Other Expenses, Net	(16)	(14)	(13)
Insurance expenses	69	107	63
Liability for reported insurance claims and estimate of unreported claims	8	11
Ceded insurance expenses	76	68	64
Premiums Written and Earned [Abstract]
Direct premiums written	328	293	270
Assumed premiums written	0	0	0
Ceded premiums written	(194)	(166)	(151)
Net premiums written	134	127	119
Direct premiums earned	254	230	216
Assumed premiums earned	0	0	0
Ceded premiums earned	(121)	(105)	(97)
Net premiums earned	133	125	119
Affiliated Entity [Member]
Statutory Accounting Practices [Line Items]
Earned insurance premiums	90	75	64
Insurance loss and loss adjustment expenses	36	30	$ 26
Affiliated Entity [Member]
Statutory Accounting Practices [Line Items]
Related Party Transaction, Unearned Insurance Premium	$ 176	$ 149