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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 | Jun. 30, 2023 | Dec. 31, 2022
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Futures | Options – purchased |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount | $ 216 |
Asset, estimated fair value | 5 |
Liability, estimated fair value |  |
Futures | Futures – short |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount | 165 | 169
Asset, estimated fair value |  |
Liability, estimated fair value | (2) |
Warrants |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount | 95 | 117
Asset, estimated fair value | 5 | 6
Liability, estimated fair value |  |
Interest rate swaps |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount | 240 | 240
Asset, estimated fair value | 19 | 19
Liability, estimated fair value |  |
Currency forwards |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount | 13 | 12
Asset, estimated fair value |  |
Liability, estimated fair value | $ (1) | $ (1)

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