Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	$ 166	$ 239
Derivatives, Liability Fair Value	265	291
Interest rate contracts
Derivatives, Fair Value [Line Items]
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	2
Hedged Asset, Fair Value Hedge	202	202
Designated as Hedging Instrument \| Interest rate contracts \| Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	0	0
Designated as Hedging Instrument \| Interest rate contracts \| Fair Value Hedging [Member] \| Derivatives
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	0	0
Designated as Hedging Instrument \| Interest rate contracts \| Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	10	10
Designated as Hedging Instrument \| Interest rate contracts \| Cash flow hedges \| Derivatives
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	0	0
Designated as Hedging Instrument \| Foreign exchange contracts \| Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	467	504
Designated as Hedging Instrument \| Foreign exchange contracts \| Cash flow hedges \| Derivatives
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	9	37
Derivatives, Liability Fair Value	21	2
Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	112	72
Not Designated as Hedging Instrument \| Credit contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	2	0
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	11,754	11,626
Not Designated as Hedging Instrument \| Interest rate contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	139	201
Derivatives, Liability Fair Value	225	266
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	85	44
Not Designated as Hedging Instrument \| Foreign exchange contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	1
Derivatives, Liability Fair Value	4	0
Not Designated as Hedging Instrument \| Fixed maturities
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	2	0
Derivatives, Liability Fair Value	0	4
Not Designated as Hedging Instrument \| Managed Custody Guarantees
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	3	4
Not Designated as Hedging Instrument \| Stabilizer
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	10	15
Not Designated as Hedging Instrument \| Reinsurance agreements
Derivatives, Fair Value [Line Items]
Derivative Asset, Not Subject to Master Netting Arrangement	16	0
Derivative Liability, Not Subject to Master Netting Arrangement	$ 0	$ 0

Fair value of 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, not subject to a master netting arrangement.

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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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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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Fair value of 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, not subject to a master netting arrangement.

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Nominal or face amount used to calculate payment on derivative.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of asset hedged in fair value hedging relationship.

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Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. Excludes cumulative basis adjustment related to foreign exchange risk.

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