Name:	aig_AsbestosClaimsDiscountAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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.

No definition available.

Name:	aig_DiscountingOfReservesLineItems
Namespace Prefix:	aig_
Data Type:	xbrli:stringItemType
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Represents the increase in discount of loss reserves.

No definition available.

Name:	aig_IncreaseDecreaseInLossReserveDiscount
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the increase (decrease) in discount of loss reserves attributable to current accident year loss reserve activities.

No definition available.

Name:	aig_IncreaseDecreaseInLossReserveDiscountRelatedToCurrentAy
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
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Represents the increase (decrease) in discount of loss reserves attributable to change in interest rate

No definition available.

Name:	aig_IncreaseDecreaseInLossReserveDiscountRelatedToInterestRateChange
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
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Represents the increase (decrease) in discount of loss reserves attributable to prior year year loss reserve development and payout pattern

No definition available.

Name:	aig_IncreaseDecreaseInLossReserveDiscountRelatedToPriorYear
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
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Represents the increase (decrease) in discount of loss reserves associated to the lines of businesses that was transferred from U.S. LFL to Legacy portfolio -PC runoff insurance lines

No definition available.

Name:	aig_IncreaseDecreaseInLossReserveDiscountTransfer
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the discount of loss reserves to present value for claims that won't be paid for an extended period of time.

No definition available.

Name:	aig_LossReserveDiscount
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Current year monetary amount of the change in worker's compensation non tabular reserve liability resulting from the discount applied to reduce the reserve to present value.

No definition available.

Name:	aig_WorkersCompensationDiscountAmountNonTabular
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Current year monetary amount of the change in worker's compensation tabular reserve liability resulting from the discount applied to reduce the reserve to present value.

No definition available.

Name:	aig_WorkersCompensationDiscountAmountTabular
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For tabular calculations of the workers compensation reserve, the percent discount applied to worker's compensation reserve liability to reduce the reserve to present value.

No definition available.

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

Current year monetary amount of the change in worker's compensation reserve liability resulting from the discount applied to reduce the reserve to present value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.(a),13(b))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Period Type:	instant

Percent discount applied to worker's compensation reserve liability to reduce the reserve to present value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.13(b))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14754-158437

Name:	us-gaap_WorkersCompensationDiscountPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_ProductOrServiceAxis=aig_UsLiabilityAndFinancialLinesMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_ProductOrServiceAxis=aig_LegacyPropertyAndCasualtyRunOffInsuranceLinesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_ProductOrServiceAxis=aig_UsWorkersCompensationMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_ProductOrServiceAxis=aig_AsbestosAndEnvironmentalRelatedClaimsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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