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Investments - Fair Value of Trading Securities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | $ 2,025 | $ 2,359
Corporate bonds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | 1,409 | 1,653
State and municipal bonds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | 13 | 21
Foreign government bonds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | 41 | 46
RMBS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | 63 | 62
CMBS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | 109 | 104
ABS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | 371 | 455
Hybrid and redeemable preferred securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | $ 19 | $ 18

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