Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 358	$ 374
Liability Fair Value	396	429
Interest rate contracts
Derivatives, Fair Value [Line Items]
Hedged asset, fair value hedge	307	106
Hedged asset, fair value hedge, cumulative increase (decrease)	(8)	(6)
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	2	0
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	106	98
Designated as Hedging Instrument \| Cash Flow Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	11	12
Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	623	718
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	6	0
Liability Fair Value	0	4
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	46	33
Liability Fair Value	2	7
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	14,633	16,773
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	203	183
Not Designated as Hedging Instrument \| Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	286	255
Not Designated as Hedging Instrument \| Fixed maturities
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	2
Liability Fair Value	4	0
Not Designated as Hedging Instrument \| Within reinsurance agreements
Derivatives, Fair Value [Line Items]
Asset Fair Value	55	61
Liability Fair Value	41	49
Not Designated as Hedging Instrument \| Managed Custody Guarantees
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	4	8
Not Designated as Hedging Instrument \| Stabilizer
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	15	1
Not Designated as Hedging Instrument \| Credit Default Swap
Derivatives, Fair Value [Line Items]
Notional Amount	97	137
Not Designated as Hedging Instrument \| Derivatives \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	246	270
Liability Fair Value	313	354
Not Designated as Hedging Instrument \| Derivatives \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	3	4
Liability Fair Value	6	2
Not Designated as Hedging Instrument \| Derivatives \| Equity contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	2	4
Liability Fair Value	9	2
Not Designated as Hedging Instrument \| Derivatives \| Credit Default Swap
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	$ 2	$ 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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