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Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 2,558		$ 2,580
Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables and other	$ 2,558		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	$ 158		174
Reinsurer Concentration Risk	6.30%	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	$ 1,611		1,626
Reinsurer Concentration Risk	63.00%	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	$ 431		423
Reinsurer Concentration Risk	16.80%	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	$ 208		212
Reinsurer Concentration Risk	8.10%	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	$ 47		42
Reinsurer Concentration Risk	1.80%	1.60%
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	$ 59		59
Reinsurer Concentration Risk	2.30%	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	$ 44		$ 44
Reinsurer Concentration Risk	1.70%	1.70%

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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

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-Publisher FASB
-Name Accounting Standards Codification
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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
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