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Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 2,585	$ 983
Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 2,586	$ 983
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	$ 164	$ 182
Reinsurer Concentration Risk	6.40%	18.50%
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	$ 1,634	$ 0
Reinsurer Concentration Risk	63.20%	0.00%
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	$ 412	$ 420
Reinsurer Concentration Risk	15.90%	42.70%
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	$ 223	$ 216
Reinsurer Concentration Risk	8.60%	22.00%
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	$ 45	$ 46
Reinsurer Concentration Risk	1.70%	4.70%
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	$ 64	$ 64
Reinsurer Concentration Risk	2.50%	6.50%
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	$ 44	$ 55
Reinsurer Concentration Risk	1.70%	5.60%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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