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Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Activity In The Reserve For Future Policy Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reserve For Losses, LAE And Future Policy Benefit Reserve [Abstract]
Balance at beginning of year	$ 36	$ 38	$ 43
Liabilities assumed
Adjustments to reserves	(3)	1	(1)
Benefits paid in the current year	(4)	(3)	(4)
Balance at end of year	$ 29	$ 36	$ 38

X

- Definition

Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]

+ References

No definition available.

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X

- Definition

Amount, before effect of reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 944
-SubTopic 40
-Section 50
-Paragraph 6
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-Publisher FASB
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X

- Definition

Amount of cash outflow to policyholder from benefit payment for expected future policy benefit and expense component of liability for future policy benefit.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 6
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- Definition

Amount of expense (income) recognized due to changes in the accrued obligation to policyholders that relates to insured events.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in accrued obligations to policy and contract holders for long-duration insurance contracts.

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