DEBT (Details - Credit facilities) - 5-Year Syndicated Facility $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
Schedule of Debt Instruments [Line Items]
Maximum borrowing capacity	$ 4,500
Remaining borrowing capacity	$ 4,500
Debt Instrument, Maturity Date	June 2022
Debt Instrument Effective Date	Jun. 27, 2017

Date when the debt instrument becomes effective, in CCYY-MM-DD format.

No definition available.

Name:	aig_DebtInstrumentEffectiveDate
Namespace Prefix:	aig_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in Month-YY format.

+ References

No definition available.

+ Details

Name:	aig_DebtInstrumentMaturityDate1
Namespace Prefix:	aig_
Data Type:	invest:dateStringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	aig_ScheduleOfDebtInstrumentsLineItems
Namespace Prefix:	aig_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=aig_Syndicated4YearFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: