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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
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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- Definition

Fair value, before 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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- Definition

Nominal or face amount used to calculate payment on derivative.

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