Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Premiums Written	$ 55	$ 37	$ 115	$ 67
Assumed Reinsurance Premiums Written	0	0	0	0
Ceded Reinsurance Premiums Written	100	27	142	46
Premiums written, net of reinsurance	45	(9)	27	(21)
Direct Premiums Earned	52	30	98	53
Assumed Reinsurance Premiums Earned	0	0	0	0
Ceded Reinsurance Premiums Earned	$ 37	$ 16	$ 69	$ 24