Separate Account Assets and Liabilities - Separate account liabilities (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Separate Account, Liability [Roll Forward]
Balance, beginning of year	$ 84,853	$ 109,111
Premiums and deposits	1,552	2,274
Policy charges	(955)	(965)
Surrenders and withdrawals	(3,600)	(3,106)
Benefit payments	(743)	(775)
Investment performance	8,600	(19,660)
Net transfers from (to) general account	10	(146)
Other charges	1	2
Balance, end of period	89,718	86,735
Cash surrender value	88,389	85,411
Individual Retirement
Separate Account, Liability [Roll Forward]
Balance, beginning of year	45,178	57,927
Premiums and deposits	807	1,354
Policy charges	(662)	(646)
Surrenders and withdrawals	(1,776)	(1,741)
Benefit payments	(432)	(476)
Investment performance	4,172	(10,249)
Net transfers from (to) general account	122	93
Other charges	0	0
Balance, end of period	47,409	46,262
Cash surrender value	46,307	45,154
Group Retirement
Separate Account, Liability [Roll Forward]
Balance, beginning of year	34,361	45,138
Premiums and deposits	697	868
Policy charges	(221)	(244)
Surrenders and withdrawals	(1,390)	(1,329)
Benefit payments	(250)	(283)
Investment performance	4,169	(8,987)
Net transfers from (to) general account	(121)	(261)
Other charges	0	0
Balance, end of period	37,245	34,902
Cash surrender value	37,050	34,699
Life Insurance
Separate Account, Liability [Roll Forward]
Balance, beginning of year	799	1,044
Premiums and deposits	18	19
Policy charges	(25)	(25)
Surrenders and withdrawals	(12)	(11)
Benefit payments	(3)	(4)
Investment performance	113	(216)
Net transfers from (to) general account	(2)	0
Other charges	0	0
Balance, end of period	888	807
Cash surrender value	854	792
Institutional Markets
Separate Account, Liability [Roll Forward]
Balance, beginning of year	4,515	5,002
Premiums and deposits	30	33
Policy charges	(47)	(50)
Surrenders and withdrawals	(422)	(25)
Benefit payments	(58)	(12)
Investment performance	146	(208)
Net transfers from (to) general account	11	22
Other charges	1	2
Balance, end of period	4,176	4,764
Cash surrender value	$ 4,178	$ 4,766

Transfer To (From) Policyholder Account Balance (To) From General Account

No definition available.

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

- Definition

Amount of cash outflow to separate account policyholder from benefit payment.

+ References

+ Details

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

- Definition

Amount of separate account liability payable to policyholder upon surrender of contract before maturity.

+ References

+ Details

Name:	us-gaap_SeparateAccountLiabilityCashSurrenderValueAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase (decrease) in separate account liability from performance of investment.

+ References

+ Details

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

- Definition

Amount increase (decrease) in separate account liability from change, classified as other.

+ References

+ Details

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

- Definition

Amount of decrease in separate account liability from policy charge.

+ References

+ Details

Name:	us-gaap_SeparateAccountLiabilityPolicyCharge
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash inflow to separate account liability from premium and deposit from cash received.

+ References

+ Details

Name:	us-gaap_SeparateAccountLiabilityPremiumAndDeposit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Definition

Amount of decrease in separate account liability from contract redemption and withdrawal of funds.

+ References

+ Details

Name:	us-gaap_SeparateAccountLiabilitySurrenderAndWithdrawal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of liability for variable contract in which all or portion of contract holder's funds is allocated to specific separate account and supported by assets held in separate account.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480078/944-80-55-18

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480109/944-80-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480141/944-80-45-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(18))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480109/944-80-50-2

+ Details

Name:	us-gaap_SeparateAccountsLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=aig_IndividualRetirementSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=aig_GroupRetirementSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=aig_LifeInsuranceOperatingSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=aig_InstitutionalMarketsSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: