Premiums Receivable and Other Insurance Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Premiums Receivable Disclosure [Abstract]
Prepaid reinsurance premiums	$ 594	$ 580
Reinsurance recoverable on unpaid losses	60	66
Reinsurance recoverable on paid losses	44	38
Premiums receivable	206	154
Deferred policy and service contract acquisition costs	1,886	1,911
Total premiums receivable and other insurance assets	$ 2,790	$ 2,749