Premiums Receivable and Other Insurance Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Premiums Receivable Disclosure [Abstract]
Prepaid reinsurance premiums	$ 549	$ 554
Reinsurance recoverable on unpaid losses	81	90
Reinsurance recoverable on paid losses	23	23
Premiums receivable	97	100
Deferred policy acquisition costs	1,974	1,912
Total premiums receivable and other insurance assets	$ 2,724	$ 2,679