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Collateralized Reinsurance And Trust Agreements (Narrative) (Details) - USD ($) $ in Millions		9 Months Ended
	Apr. 01, 2018	Sep. 30, 2022	Dec. 31, 2021
Effects of Reinsurance [Line Items]
Amount on deposit in trust accounts		$ 2,200
Restricted cash		107
Preferred shares
Mt Logan Re [Member]
Effects of Reinsurance [Line Items]
Percentage of voting common shares owned by Group		100.00%
Retrocede amount	$ 269
Cash transferred	252
Mt Logan Re [Member] | Minimum [Member]
Effects of Reinsurance [Line Items]
Accident year		2002
Mt Logan Re [Member] | Maximum [Member]
Effects of Reinsurance [Line Items]
Accident year		2015
Liability retroceded	$ 319

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