Statutory Financial Data and Restrictions - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Statutory Accounting Practices [Line Items]
Statutory capital and surplus considered insurance subsidiaries	$ 41,100
Life Insurance Companies
Statutory Accounting Practices [Line Items]
Increase in statutory surplus due to permitted practice	$ 1,000	$ 584
NY
Statutory Accounting Practices [Line Items]
Surplus not available for dividends (as a percent)	10.00%
Adjusted net investment income not available for dividends (as a percent)	100.00%

Statutory Accounting Practices Adjusted Net Investment Income Not Available for Dividends Percentage

No definition available.

Name:	aig_StatutoryAccountingPracticesAdjustedNetInvestmentIncomeNotAvailableForDividendsPercentage
Namespace Prefix:	aig_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Statutory Accounting Practices Dividend Payments Restrictions Net Assets of Consolidated Subsidiaries Companies

+ References

No definition available.

+ Details

Name:	aig_StatutoryAccountingPracticesDividendPaymentsRestrictionsNetAssetsOfConsolidatedSubsidiariesCompanies
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Statutory Accounting Practices Policyholders Surplus Not Available for Dividends Percentage

+ References

No definition available.

+ Details

Name:	aig_StatutoryAccountingPracticesPolicyholdersSurplusNotAvailableForDividendsPercentage
Namespace Prefix:	aig_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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.

+ References

No definition available.

+ Details

Name:	us-gaap_StatutoryAccountingPracticesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of each item listed to reconcile the differences as of the balance sheet date resulting from applying state permitted statutory accounting practices rather than statutory accounting practices permitted by National Association of Insurance Commissioners.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=6486098&loc=d3e24746-158529

+ Details

Name:	us-gaap_StatutoryAccountingPracticesPermittedPracticeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	aig_LegalEntityGroupsAxis=aig_LifeInsuranceCompaniesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=aig_NYMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: