Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Premiums Written	$ 37	$ (3)	$ 67	$ (5)
Assumed Reinsurance Premiums Written	0	0	0	0
Ceded Reinsurance Premiums Written	27	9	46	16
Premiums written, net of reinsurance	(9)	13	(21)	21
Direct Premiums Earned	30	14	53	31
Assumed Reinsurance Premiums Earned	0	0	0	0
Ceded Reinsurance Premiums Earned	$ 16	$ 3	24	6
Reinsurance on premiums earned, Net			$ 28	$ 25