Additional percentage of fair value of hedge fund porfolio avaialble for redemption

No definition available.

Name:	aig_HedgeFundFairValueRedemptionAdditionalPercentage
Namespace Prefix:	aig_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent reporting 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:	aig_InvestmentsLineItems
Namespace Prefix:	aig_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of investments classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f,g))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_OtherInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cumulative amount of depreciation for real estate property held for investment purposes.

+ References

+ Details

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

- Details

Name:	us-gaap_InvestmentTypeAxis=aig_AlternativeFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_RealEstateInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=aig_OtherInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=aig_FortitudeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_HedgeFundsEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_PrivateEquityFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=aig_AffordablehousingpartnershipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

INVESTMENTS (Details - Carrying amounts of other invested assets) - USD ($) $ in Millions	9 Months Ended	84 Months Ended
	Sep. 30, 2020	Dec. 31, 2027	Dec. 31, 2019
Investments [Line Items]
Other invested assets	$ 17,915		$ 18,792
Alternative investments
Investments [Line Items]
Other invested assets	8,391		8,845
Investment real estate
Investments [Line Items]
Other invested assets	8,010		8,491
Net of accumulated depreciation on investment in real estate	780		703
All other investments
Investments [Line Items]
Other invested assets	1,514		1,456
All other investments \| Fortitude
Investments [Line Items]
Other invested assets	100
Hedge Funds
Investments [Line Items]
Other invested assets	$ 2,200		3,300
Hedge Fund Fair Value Redemption, Additional Percentage	63.00%	37.00%
Direct private equity
Investments [Line Items]
Other invested assets	$ 5,900		5,200
Affordable Housing Partnerships
Investments [Line Items]
Other invested assets	$ 270		$ 331