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Investments - Schedule of Bank Loans Amortized Cost by Credit Rating and Year of Origination (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | $ 815 | $ 822
Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 177 | 246
Allowance | (13) | (22)
Amortized cost, net | 164 | 224
NAIC 2 / BBB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 4 | 9
NAIC 3 / BB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 20 | 38
NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 134 | 153
NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 19 | $ 46
2019 and prior | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 32 |
2019 and prior | NAIC 2 / BBB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2019 and prior | NAIC 3 / BB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2019 and prior | NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 24 |
2019 and prior | NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 8 |
2020 | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 3 |
2020 | NAIC 2 / BBB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 2 |
2020 | NAIC 3 / BB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2020 | NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 1 |
2020 | 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 | 26 |
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 | 4 |
2021 | NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 17 |
2021 | NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 5 |
2022 | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 6 |
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 | 0 |
2022 | NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 6 |
2022 | NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
2023 | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 85 |
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 | 9 |
2023 | NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 71 |
2023 | NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 5 |
Current | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 25 |
Current | NAIC 2 / BBB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 2 |
Current | NAIC 3 / BB | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 7 |
Current | NAIC 4 / B | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 15 |
Current | NAIC 5-6 / CCC and below | Bank loans, net |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | $ 1 |

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