Closing price per share (in dollars per share)

$ 56.01us-gaap_SharePrice

$ 51.05us-gaap_SharePrice

$ 35.3us-gaap_SharePrice

Proceeds from divested businesses, net

$ 2,348,000,000us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested

AerCap

Number of shares received

97.6aig_NoncashOrPartNoncashDivestitureConsiderationAcquirerSharesReceived
/ dei_LegalEntityAxis
= aig_AerCapHoldingsNVMember

Aggregate stated value of consideration

4,600,000,000us-gaap_NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1
/ dei_LegalEntityAxis
= aig_AerCapHoldingsNVMember

Closing price per share (in dollars per share)

$ 47.01us-gaap_SharePrice
/ dei_LegalEntityAxis
= aig_AerCapHoldingsNVMember

Aggregate commitment under revolving credit facility

1,000,000,000aig_DebtIssuedFaceAmount
/ dei_LegalEntityAxis
= aig_AerCapHoldingsNVMember

Difference between carrying amount and equity AerCap

1,400,000,000aig_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity1
/ dei_LegalEntityAxis
= aig_AerCapHoldingsNVMember

Difference between carrying amount and equity of AerCap amortized into income based on estimated lives of assets and liabilities

400,000,000aig_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquityAmortizedIntoIncomeBasedOnEstimatedLivesOfAssetsAndLiabilities
/ dei_LegalEntityAxis
= aig_AerCapHoldingsNVMember

International Lease Finance Corporation (ILFC)

Percentage of common stock held after closing of transaction

Consideration in cash

7,600,000,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ dei_LegalEntityAxis
= aig_InternationalLeaseFinanceCorporationMember

100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ dei_LegalEntityAxis
= aig_InternationalLeaseFinanceCorporationMember

International Lease Finance Corporation (ILFC)

Percentage of common stock agreed to be sold

100.00%aig_DisposalGroupIncludingDiscontinuedOperationPercentageOfCommonStockAgreedToBeSold
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aig_InternationalLeaseFinanceCorporationMember

Proceeds from divested businesses, net

2,400,000,000us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aig_InternationalLeaseFinanceCorporationMember

Pre-tax gain (loss) on discontinued operations

2,200,000,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aig_InternationalLeaseFinanceCorporationMember

After-tax gain on sale of business

1,400,000,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aig_InternationalLeaseFinanceCorporationMember

International Lease Finance Corporation (ILFC) | AerCap

Percentage of common stock held after closing of transaction

46.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aig_InternationalLeaseFinanceCorporationMember
/ dei_LegalEntityAxis
= aig_AerCapHoldingsNVMember

ALICO | MetLife Inc. (MetLife)

Pre-tax gain (loss) on discontinued operations

$ 23,000,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aig_ALICOMember
/ dei_LegalEntityAxis
= aig_MetLifeIncMember

$ 150,000,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aig_ALICOMember
/ dei_LegalEntityAxis
= aig_MetLifeIncMember

$ 1,000,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aig_ALICOMember
/ dei_LegalEntityAxis
= aig_MetLifeIncMember

Represents the aggregate commitment under revolving credit facility issued by the entity to the borrower.

No definition available.

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

For disposal group including discontinued operations, represents the percentage of common stock agreed to be sold.

No definition available.

Name:	aig_DisposalGroupIncludingDiscontinuedOperationPercentageOfCommonStockAgreedToBeSold
Namespace Prefix:	aig_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

No definition available.

Name:	aig_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity1
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.

Name:	aig_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquityAmortizedIntoIncomeBasedOnEstimatedLivesOfAssetsAndLiabilities
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the number of shares of stock of the acquirer received as noncash consideration for the disposal of a disposal group.

No definition available.

Name:	aig_NoncashOrPartNoncashDivestitureConsiderationAcquirerSharesReceived
Namespace Prefix:	aig_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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

Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

Name:	us-gaap_NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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

This element represents the cash inflow during the period from the sale of a component of the entity.

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

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

Price of a single share of a number of saleable stocks of a company.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

No definition available.

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

Name:	dei_LegalEntityAxis=aig_AerCapHoldingsNVMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=aig_InternationalLeaseFinanceCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=aig_ALICOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: