Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Investments - Aggregate Contractual or Notional Amounts and Estimated Fair Values Related to Derivative Financial Instruments (Details) - Without hedge designation - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Futures \| Short
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount	$ 169
Estimated Fair Value, Asset
Estimated Fair Value, Liability
Warrants
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount	117
Estimated Fair Value, Asset	6
Estimated Fair Value, Liability
Interest rate swaps
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount	240	100
Estimated Fair Value, Asset	19
Estimated Fair Value, Liability
Currency forwards
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount	12
Estimated Fair Value, Asset
Estimated Fair Value, Liability	(1)
Embedded derivative on funds withheld liability
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount		270
Estimated Fair Value, Asset
Estimated Fair Value, Liability		$ (12)