Premiums Receivable and Other Insurance Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Premiums Receivable Disclosure [Abstract]
Prepaid reinsurance premiums	$ 580	$ 553
Reinsurance recoverable on unpaid losses	66	72
Reinsurance recoverable on paid losses	38	26
Premiums receivable	154	114
Deferred policy and service contract acquisition costs	1,911	1,933
Total premiums receivable and other insurance assets	$ 2,749	$ 2,698