Insurance Premiums and Service Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Written
Direct	$ 388	$ 397	$ 438
Assumed	42	15	3
Gross insurance premiums	430	412	441
Earned
Direct	379	389	429
Assumed	29	8	3
Gross insurance premiums	408	397	432
Written
Ceded	(216)	(200)	(211)
Net insurance premiums	214	212	230
Earned
Ceded	(211)	(205)	(208)
Net insurance premiums	197	192	224
Service revenue	889	985	999
Service revenue	954	925	879
Insurance premiums and service revenue written	1,103	1,197	1,229
Insurance premiums and service revenue earned	$ 1,151	$ 1,117	$ 1,103