Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 2,456	$ 2,580
Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 2,456	$ 2,580
Reinsurer Concentration Risk	100.00%	100.00%
Other Reinsurers [Member] | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 122	$ 174
Reinsurer Concentration Risk	5.10%	6.80%
AM Best, A+ Rating [Member] | Reinsurer A [Member] | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 1,607	$ 1,626
Reinsurer Concentration Risk	65.40%	63.00%
AM Best, A+ Rating [Member] | Reinsurer B [Member] | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 406	$ 423
Reinsurer Concentration Risk	16.50%	16.40%
AM Best, A+ Rating [Member] | Reinsurer C [Member] | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 194	$ 212
Reinsurer Concentration Risk	7.90%	8.20%
AM Best, A+ Rating [Member] | Reinsurer E [Member] | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 40	$ 44
Reinsurer Concentration Risk	1.60%	1.70%
AM Best, A Rating [Member] | Reinsurer D [Member] | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 54	$ 59
Reinsurer Concentration Risk	2.20%	2.30%
AM Best, A++ Rating [Member] | Reinsurer F | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 33	$ 42
Reinsurer Concentration Risk	1.30%	1.60%