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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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