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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Derivative liabilities | $ 29 | $ 35
Weighted average discounted rate of estimated future premium payments to be paid by the VIEs | 3.20% | 3.20%
Derivative assets | $ 21 | $ 26
Derivative assets | 21 | 26
Warrants [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Derivative assets | 1 | 1
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Other investments | $ 394 | $ 386
Fixed Income Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Percentage of investment portfolio valued using dealer quotes | 2.00% | 2.00%
Minimum [Member] | Fixed Income Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Percentage of investment portfolio valued using internal valuation models | 4.00% | 4.00%
Maximum [Member] | Fixed Income Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Percentage of investment portfolio valued using external pricing services | 94.00% | 94.00%
Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Derivative liabilities | $ 1,170 | $ 1,197
Weighted average discounted rate of estimated future premium payments to be paid by the VIEs | 6.30% |
Derivative assets | $ 221 | 226
Derivative assets | $ 221 | $ 226

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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