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Investments - Schedule of Mortgage Loans Amortized Cost by Debt Service Coverage Ratio Distribution and Year of Origination (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost, net | $ 765 | $ 822
Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 776 | 833
Allowance | (11) | (11)
Amortized cost, net | 765 | 822
Mortgage loans | 2019 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 293 |
Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 51 |
Mortgage loans | 2021 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 183 |
Mortgage loans | 2022 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 90 |
Mortgage loans | 2023 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 144 |
Mortgage loans | 2024 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 15 |
Below 1.0 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 | 13
Below 1.0 | Mortgage loans | 2019 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Below 1.0 | Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Below 1.0 | Mortgage loans | 2021 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Below 1.0 | Mortgage loans | 2022 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Below 1.0 | Mortgage loans | 2023 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Below 1.0 | Mortgage loans | 2024 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
1.0 - 1.25 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 105 | 41
1.0 - 1.25 | Mortgage loans | 2019 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 60 |
1.0 - 1.25 | Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
1.0 - 1.25 | Mortgage loans | 2021 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
1.0 - 1.25 | Mortgage loans | 2022 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 18 |
1.0 - 1.25 | Mortgage loans | 2023 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 27 |
1.0 - 1.25 | Mortgage loans | 2024 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
1.26 - 1.50 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 129 | 133
1.26 - 1.50 | Mortgage loans | 2019 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 48 |
1.26 - 1.50 | Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 10 |
1.26 - 1.50 | Mortgage loans | 2021 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
1.26 - 1.50 | Mortgage loans | 2022 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 30 |
1.26 - 1.50 | Mortgage loans | 2023 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 41 |
1.26 - 1.50 | Mortgage loans | 2024 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Above 1.50 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 542 | $ 646
Above 1.50 | Mortgage loans | 2019 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 185 |
Above 1.50 | Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 41 |
Above 1.50 | Mortgage loans | 2021 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 183 |
Above 1.50 | Mortgage loans | 2022 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 42 |
Above 1.50 | Mortgage loans | 2023 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 76 |
Above 1.50 | Mortgage loans | 2024 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | $ 15 |

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References No definition available. + Details
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