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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, 2022	Dec. 31, 2021
Interest rate swaps
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/notional amount	$ 240	$ 100
Asset, estimated fair value	19
Liability, estimated fair value
Embedded derivative on funds withheld liability
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/notional amount	220	270
Asset, estimated fair value	1
Liability, estimated fair value		(12)
Other
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/notional amount	127
Asset, estimated fair value	7
Liability, estimated fair value

X

- 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.

+ References

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X

- Definition

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.

+ References

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X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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