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Schedule II - Condensed Financial Information Of The Registrant (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Other assets	$ 930,000,000	$ 757,000,000
Other income (expense)	(102,000,000)	37,000,000	$ 6,000,000
Parent Company [Member]
Debt Instrument [Line Items]
Other assets	43,000,000	50,000,000
Other income (expense)			$ 6,000,000
Parent Company [Member] | Notes Payable Affiliated [Member] | 1.69% Matures December 2028 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	$ 300,000,000
Debt instrument, stated interest rate	1.69%
Parent Company [Member] | Notes Payable Affiliated [Member] | 1.00% Matures August 2030 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	$ 200,000,000
Debt instrument, stated interest rate	1.00%
Parent Company [Member] | Notes Payable Affiliated [Member] | 3.11% Matures June 2052 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	$ 215,000,000
Debt instrument, stated interest rate	3.11%
Parent Company [Member] | Notes Payable Affiliated [Member] | 4.34% Matures June 2052 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	$ 125,000,000
Debt instrument, stated interest rate	4.34%
Parent Company [Member] | Notes Payable Affiliated [Member] | 4.34% Matures December 2052 - 1 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	$ 125,000,000
Debt instrument, stated interest rate	4.34%
Parent Company [Member] | Notes Payable Affiliated [Member] | 4.34% Matures December 2052 - 2 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	$ 1,773,000,000
Debt instrument, stated interest rate	4.34%
Mt Logan Re [Member]
Debt Instrument [Line Items]
Other assets	$ 65,000,000	66,000,000
Other income (expense)	$ (900,000)	$ (1,300,000)

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