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SCHEDULE II — CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2024 | Sep. 30, 2023 | May 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Aug. 31, 2021 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term notes |  |  |  | $ 218,000,000 | $ 218,000,000 |  |  |  |
Other assets |  |  |  | 1,171,000,000 | 941,000,000 |  |  |  |
Other income (expense) |  |  |  | 121,000,000 | (14,000,000) | $ (102,000,000) |  |  |
Parent Company |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Issuance of long term notes receivable - affiliated |  |  | $ 100,000,000 | 600,000,000 | 100,000,000 | 0 |  |  |
Long-term note, stated interest rate |  |  | 3.72% |  |  |  |  |  |
Proceeds from repayment of long term notes receivable - affiliated | $ 50,000,000 | $ 50,000,000 |  | 50,000,000 | 50,000,000 | 0 |  |  |
Long-term notes receivable, affiliated |  |  |  | 600,000,000 | 50,000,000 |  |  |  |
Other assets |  |  |  | 37,000,000 | 46,000,000 |  |  |  |
Other income (expense) |  |  |  | 7,000,000 | 8,000,000 | 0 |  |  |
Parent Company | Affiliated Entity |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Issuance of long term notes receivable - affiliated |  |  |  | $ 600,000,000 |  |  |  |  |
Long-term note, stated interest rate |  |  |  | 4.30% |  |  |  |  |
Parent Company | Notes Payable Affiliated | 1.69% Matures December 2028 | Affiliated Entity |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  | $ 300,000,000
Debt instrument, stated interest rate |  |  |  |  |  |  |  |  | 1.69%
Long-term notes |  |  |  |  | 0 |  |  |  |
Parent Company | Notes Payable Affiliated | 1.00% Matures August 2030 | Affiliated Entity |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  | $ 200,000,000 |
Debt instrument, stated interest rate |  |  |  |  |  |  |  | 1.00% |
Long-term notes |  |  |  |  | 0 |  |  |  |
Parent Company | Notes Payable Affiliated | 3.11% Matures June 2052 | Affiliated Entity |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  | $ 215,000,000 |  |
Debt instrument, stated interest rate |  |  |  |  |  |  | 3.11% |  |
Long-term notes |  |  |  |  | 0 |  |  |  |
Parent Company | Notes Payable Affiliated | 4.34% Matures June 2052 | Affiliated Entity |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  | $ 125,000,000 |  |  |
Debt instrument, stated interest rate |  |  |  |  |  | 4.34% |  |  |
Long-term notes |  |  |  |  | 0 |  |  |  |
Parent Company | Notes Payable Affiliated | 4.34% Matures December 2052 - 1 | Affiliated Entity |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  | $ 125,000,000 |  |  |
Debt instrument, stated interest rate |  |  |  |  |  | 4.34% |  |  |
Long-term notes |  |  |  |  | 0 |  |  |  |
Parent Company | Notes Payable Affiliated | 4.34% Matures December 2052 - 2 | Affiliated Entity |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  | $ 1,800,000,000 |  |  |
Debt instrument, stated interest rate |  |  |  |  |  | 4.34% |  |  |
Parent Company | Notes Payable Affiliated | 4.30% Matures December 2027-1 | Affiliated Entity |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  | $ 100,000,000 |  |  |  |  |
Debt instrument, stated interest rate |  |  |  | 4.30% |  |  |  |  |
Parent Company | Notes Payable Affiliated | 4.30% Matures December 2027-2 | Affiliated Entity |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  | $ 300,000,000 |  |  |  |  |
Debt instrument, stated interest rate |  |  |  | 4.30% |  |  |  |  |
Mt Logan Re |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Other assets |  |  |  | $ 39,000,000 | 46,000,000 |  |  |  |
Other income (expense) |  |  |  | $ 8,000,000 | $ 8,000,000 | $ (1,000,000) |  |  |

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