Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Asset Fair Value	$ 250	$ 358
Liability Fair Value	327	396
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	15,498	14,633
Asset Fair Value	169	246
Liability Fair Value	265	313
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	271	11
Asset Fair Value	0	0
Liability Fair Value	0	0
Foreign exchange contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	264	203
Asset Fair Value	1	3
Liability Fair Value	2	6
Foreign exchange contracts \| Fair Value Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	140	106
Asset Fair Value	0	6
Liability Fair Value	0	0
Foreign exchange contracts \| Cash Flow Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	538	623
Asset Fair Value	12	46
Liability Fair Value	19	2
Equity contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	278	286
Asset Fair Value	3	2
Liability Fair Value	2	9
Credit contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	76	97
Asset Fair Value	0	0
Liability Fair Value	0	2
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	33	41
Managed Custody Guarantees \| Not Designated as Hedging Instrument
Derivative [Line Items]
Asset Fair Value	0	0
Liability Fair Value	1	4
Stabilizer \| Not Designated as Hedging Instrument
Derivative [Line Items]
Asset Fair Value	0	0
Liability Fair Value	$ 5	$ 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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