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Investments - Aggregate Contractual or Notional Amounts and Estimated Fair Values Related to Derivative Financial Instruments (Details) - Without Hedge Designation - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Options – purchased | Options – purchased |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/Notional Amount | $ 95 | $ 268
Estimated Fair Value, Asset | 1 | 2
Estimated Fair Value, Liability |  |
Futures – short | Futures – short |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/Notional Amount | 1 | 167
Estimated Fair Value, Asset |  | 1
Estimated Fair Value, Liability |  |
Warrants |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/Notional Amount | 1 | 1
Estimated Fair Value, Asset | 1 | 1
Estimated Fair Value, Liability |  |
Interest rate swaps |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/Notional Amount | 474 | 300
Estimated Fair Value, Asset |  | 4
Estimated Fair Value, Liability |  |
Credit default swap index - purchased |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/Notional Amount |  | 2,000
Estimated Fair Value, Asset |  |
Estimated Fair Value, Liability |  |

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