Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Asset Fair Value	$ 264	$ 358
Liability Fair Value	354	396
Not Designated as Hedging Instrument \| Credit contracts
Derivative [Line Items]
Notional Amount	137	97
Not Designated as Hedging Instrument \| Derivatives \| Credit contracts
Derivative [Line Items]
Asset Fair Value	0	0
Liability Fair Value	3	2
Interest rate contracts
Derivative [Line Items]
Hedged asset, fair value hedge	320	307
Hedged asset, fair value hedge, cumulative increase (decrease)	5	(8)
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	2	2
Interest rate contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	14,717	14,633
Interest rate contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Asset Fair Value	177	246
Liability Fair Value	271	313
Interest rate contracts \| Fair Value Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	0	0
Interest rate contracts \| Fair Value Hedging \| Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Asset Fair Value	0	0
Liability Fair Value	0	0
Interest rate contracts \| Cash Flow Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	11	11
Interest rate contracts \| Cash Flow Hedging \| Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Asset Fair Value	0	0
Liability Fair Value	0	0
Foreign exchange contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	228	203
Foreign exchange contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Asset Fair Value	4	3
Liability Fair Value	5	6
Foreign exchange contracts \| Fair Value Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	110	106
Foreign exchange contracts \| Fair Value Hedging \| Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Asset Fair Value	0	6
Liability Fair Value	4	0
Foreign exchange contracts \| Cash Flow Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	577	623
Foreign exchange contracts \| Cash Flow Hedging \| Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Asset Fair Value	11	46
Liability Fair Value	25	2
Equity contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	284	286
Equity contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Asset Fair Value	7	2
Liability Fair Value	1	9
Fixed maturities \| Not Designated as Hedging Instrument
Derivative [Line Items]
Asset Fair Value	3	0
Liability Fair Value	0	4
Embedded derivatives within reinsurance \| Not Designated as Hedging Instrument
Derivative [Line Items]
Asset Fair Value	62	55
Liability Fair Value	32	41
Managed Custody Guarantees \| Not Designated as Hedging Instrument
Derivative [Line Items]
Asset Fair Value	0	0
Liability Fair Value	3	4
Managed custody guarantees \| Not Designated as Hedging Instrument
Derivative [Line Items]
Asset Fair Value	0	0
Liability Fair Value	$ 10	$ 15

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

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Amount of asset hedged in fair value hedging relationship.

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