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Investments - Schedule of Bank Loans Amortized Cost by Credit Rating and Year of Origination (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | $ 831 | $ 784
Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 400 | 211
Allowance | (17) | (10)
Amortized cost, net | 383 | 201
NAIC 1 / A | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 199 | 45
NAIC 2 / BBB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 50 | 6
NAIC 3 / BB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 25 | 27
NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 108 | 122
NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 18 | $ 11
2020 and prior | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 1 |
2020 and prior | NAIC 1 / A | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2020 and prior | NAIC 2 / BBB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2020 and prior | NAIC 3 / BB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2020 and prior | NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 1 |
2020 and prior | NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2021 | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 2 |
2021 | NAIC 1 / A | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2021 | NAIC 2 / BBB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2021 | NAIC 3 / BB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2021 | NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 2 |
2021 | NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2022 | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 2 |
2022 | NAIC 1 / A | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2022 | NAIC 2 / BBB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2022 | NAIC 3 / BB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 1 |
2022 | NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2022 | NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 1 |
2023 | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 38 |
2023 | NAIC 1 / A | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2023 | NAIC 2 / BBB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2023 | NAIC 3 / BB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 2 |
2023 | NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 28 |
2023 | NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 8 |
2024 | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 81 |
2024 | NAIC 1 / A | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 44 |
2024 | NAIC 2 / BBB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 1 |
2024 | NAIC 3 / BB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 8 |
2024 | NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 27 |
2024 | NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 1 |
2025 | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 276 |
2025 | NAIC 1 / A | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 155 |
2025 | NAIC 2 / BBB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 49 |
2025 | NAIC 3 / BB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 14 |
2025 | NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 50 |
2025 | NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | $ 8 |

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