Insurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statutory Accounting Practices [Line Items]
Cash and cash equivalents	$ 55	$ 28
Marketable securities	607	696
Total cash, cash equivalents, and marketable securities	662	724
Assets Held by Insurance Regulators	11	12
Prepaid reinsurance premiums and other reinsurance recoverables	779	743
Related party transaction, prepaid reinsurance premiums and other reinsurance recoverables	99	103
Earned insurance premiums	241	223	$ 213
Insurance loss and loss adjustment expenses	107	92	88
Liability for reported insurance claims and estimate of unreported claims	18	15
Unearned insurance premiums and fees	891	857
Related Party Transactions Unearned Premiums and Fees	773	742
Premiums Written and Earned [Abstract]
Direct premiums written	337	324	366
Assumed premiums written	0	0	0
Ceded premiums written	(264)	(252)	(229)
Net premiums written	73	72	137
Direct premiums earned	306	293	350
Assumed premiums earned	0	0	0
Ceded premiums earned	(231)	(218)	(207)
Premiums Earned, Net	75	75	143
Insurance Expenses [Abstract]
Insurance losses	34	45	110
Loss adjustment expenses	2	2	5
Reinsurance Income and Other Expenses, Net	(40)	(37)	(33)
Insurance expenses	(4)	10	82
Liability for reported insurance claims and estimate of unreported claims	18	15
Ceded insurance expenses	$ 156	$ 150	$ 130