Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Premiums Written	$ 93	$ 55	$ 174	$ 115
Assumed Reinsurance Premiums Written	20	0	38	0
Ceded Reinsurance Premiums Written	79	100	150	142
Premiums written, net of reinsurance	(34)	45	(62)	27
Direct Premiums Earned	79	52	154	98
Assumed Reinsurance Premiums Earned	17	0	33	0
Ceded Reinsurance Premiums Earned	$ 64	$ 37	$ 121	$ 69