Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 253	$ 358
Liability Fair Value	278	396
Interest rate contracts
Derivatives, Fair Value [Line Items]
Hedged asset, fair value hedge	365	307
Hedged asset, fair value hedge, cumulative increase (decrease)	4	(8)
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	2	2
Designated as Hedging Instrument \| Fair Value Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Designated as Hedging Instrument \| Fair Value Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	166	106
Designated as Hedging Instrument \| Cash Flow Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	12	11
Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	521	623
Designated as Hedging Instrument \| Derivatives \| Fair Value Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	0	0
Designated as Hedging Instrument \| Derivatives \| Fair Value Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	6
Liability Fair Value	2	0
Designated as Hedging Instrument \| Derivatives \| Cash Flow Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	0	0
Designated as Hedging Instrument \| Derivatives \| Cash Flow Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	9	46
Liability Fair Value	18	2
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	14,815	14,633
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	197	203
Not Designated as Hedging Instrument \| Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	248	286
Not Designated as Hedging Instrument \| Fixed maturities
Derivatives, Fair Value [Line Items]
Asset Fair Value	1	0
Liability Fair Value	0	4
Not Designated as Hedging Instrument \| Within reinsurance agreements
Derivatives, Fair Value [Line Items]
Asset Fair Value	55	55
Liability Fair Value	(9)	41
Not Designated as Hedging Instrument \| Managed Custody Guarantees
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	0	4
Not Designated as Hedging Instrument \| Stabilizer
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	5	15
Not Designated as Hedging Instrument \| Credit Default Swap
Derivatives, Fair Value [Line Items]
Notional Amount	75	97
Not Designated as Hedging Instrument \| Derivatives \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	184	246
Liability Fair Value	258	313
Not Designated as Hedging Instrument \| Derivatives \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	1	3
Liability Fair Value	2	6
Not Designated as Hedging Instrument \| Derivatives \| Equity contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	3	2
Liability Fair Value	2	9
Not Designated as Hedging Instrument \| Derivatives \| Credit Default Swap
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	$ 0	$ 2

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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