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Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Activity In The Reserve For Losses And LAE) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Reserve For Losses, LAE And Future Policy Benefit Reserve [Abstract]
Gross reserves beginning of period	$ 19,009	$ 16,322
Less reinsurance recoverables on unpaid losses	(1,946)	(1,844)
Net reserves beginning of period	17,063	14,478
Incurred related to: Current year	6,291	5,578
Incurred related to: Prior years	(2)	(6)
Total incurred losses and LAE	6,289	5,572
Paid related to: Current year	1,794	1,376
Paid related to: Prior years	1,841	1,803
Total paid losses and LAE	3,635	3,179
Foreign exchange/translation adjustment	(605)	(41)
Net reserves end of period	19,112	16,831
Plus reinsurance recoverables on unpaid losses	2,110	2,033
Gross reserves end of period	$ 21,222	$ 18,864

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Reserve For Losses And Loss Adjustment Expenses Net

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

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The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

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Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs.

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Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs.

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Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process.

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Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process.

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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.

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Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

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Amount of increase (decrease) in cumulative translation adjustment, after tax, from translating foreign currency financial statements into the reporting currency.

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