Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 378	$ 374
Derivative Liability, Fair Value, Gross Liability	372	429
Not Designated as Hedging Instrument \| Credit contracts
Derivative [Line Items]
Notional Amount	126	137
Not Designated as Hedging Instrument \| Derivatives \| Credit contracts
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	2	2
Interest rate contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	15,367	16,773
Interest rate contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	269	270
Derivative Liability, Fair Value, Gross Liability	307	354
Interest rate contracts \| Fair Value Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	200	0
Interest rate contracts \| Fair Value Hedging \| Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	1	0
Interest rate contracts \| Cash Flow Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	12	12
Interest rate contracts \| Cash Flow Hedging \| Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Foreign exchange contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	174	183
Foreign exchange contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	4
Derivative Liability, Fair Value, Gross Liability	0	2
Foreign exchange contracts \| Fair Value Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	100	98
Foreign exchange contracts \| Fair Value Hedging \| Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	1	0
Derivative Liability, Fair Value, Gross Liability	0	4
Foreign exchange contracts \| Cash Flow Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	688	718
Foreign exchange contracts \| Cash Flow Hedging \| Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	42	33
Derivative Liability, Fair Value, Gross Liability	3	7
Equity contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	278	255
Equity contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	4	4
Derivative Liability, Fair Value, Gross Liability	3	2
Fixed maturities \| Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	2
Derivative Liability, Fair Value, Gross Liability	0	0
Embedded derivative on reinsurance \| Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Not Subject to Master Netting Arrangement	62	61
Derivative Liability, Not Subject to Master Netting Arrangement	46	49
Managed Custody Guarantees \| Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	8	8
Managed custody guarantees \| Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	$ 2	$ 1

Fair value of 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, not subject to a master netting arrangement.

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- Definition

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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Fair value of financial liability or 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, not subject to a master netting arrangement.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Nominal or face amount used to calculate payment on derivative.

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