Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	$ 350	$ 324
Derivatives, Liability Fair Value	350	337
Credit contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	138	141
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	18,692	8,736
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	675	641
Designated as Hedging Instrument \| Interest rate contracts \| Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	35	18
Designated as Hedging Instrument \| Interest rate contracts \| Cash flow hedges \| Derivatives
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	0	0
Designated as Hedging Instrument \| Foreign exchange contracts \| Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	620	596
Designated as Hedging Instrument \| Foreign exchange contracts \| Cash flow hedges \| Derivatives
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	44	58
Derivatives, Liability Fair Value	3	2
Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	138	141
Not Designated as Hedging Instrument \| Credit contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	3	2
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	20,966	12,470
Not Designated as Hedging Instrument \| Interest rate contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	302	262
Derivatives, Liability Fair Value	341	327
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	55	45
Not Designated as Hedging Instrument \| Foreign exchange contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	3	2
Derivatives, Liability Fair Value	0	0
Not Designated as Hedging Instrument \| Fixed maturities
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	1	2
Derivatives, Liability Fair Value	0	0
Not Designated as Hedging Instrument \| Stabilizer and Managed Custody Guarantees
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	$ 3	$ 6

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.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483444/210-20-55-22

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483466/210-20-50-3

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483444/210-20-55-7

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-SubTopic 20
-Topic 860
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481326/860-20-50-4D

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- Definition

Fair value, before effects of master netting arrangements, of a 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

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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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No definition available.

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