Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Derivative [Line Items]
Asset Fair Value	$ 249	$ 253
Liability Fair Value	260	278
Interest rate contracts
Derivative [Line Items]
Hedged asset, fair value hedge	370	365
Hedged asset, fair value hedge, cumulative increase (decrease)	1	4
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	2	2
Interest rate contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	15,123	14,815
Asset Fair Value	185	184
Liability Fair Value	244	258
Interest rate contracts \| Fair Value Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	0	0
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	12	12
Asset Fair Value	0	0
Liability Fair Value	0	0
Foreign exchange contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	211	197
Asset Fair Value	1	1
Liability Fair Value	3	2
Foreign exchange contracts \| Fair Value Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	173	166
Asset Fair Value	2	0
Liability Fair Value	0	2
Foreign exchange contracts \| Cash Flow Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	525	521
Asset Fair Value	14	9
Liability Fair Value	12	18
Equity contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	206	248
Asset Fair Value	1	3
Liability Fair Value	3	2
Credit contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	110	75
Asset Fair Value	0	0
Liability Fair Value	0	0
Fixed maturities \| Not Designated as Hedging Instrument
Derivative [Line Items]
Asset Fair Value	0	1
Liability Fair Value	0	0
Embedded derivatives within reinsurance \| Not Designated as Hedging Instrument
Derivative [Line Items]
Asset Fair Value	46	55
Liability Fair Value	(9)	(9)
Stabilizer \| Not Designated as Hedging Instrument
Derivative [Line Items]
Asset Fair Value	0	0
Liability Fair Value	$ 7	$ 5

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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Nominal or face amount used to calculate payment on derivative.

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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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