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

Net gains or losses for the period (realized and unrealized) related to assets and liabilities transferred into Level 3 at fair value at the end of the reporting period and are therefore not reflected in realized and unrealized gains and losses related to Level 3 for the period.

+ References

No definition available.

+ Details

Name:	aig_FairValueLevel3TransfersInAtEndOfPeriodNetGainLossExcludedFromLevel3GainsLosses
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Net gains or losses for the period (realized and unrealized) related to assets and liabilities transferred out of Level 3 at fair value at the end of the reporting period and are therefore not reflected in realized and unrealized gains and losses related to Level 3 for the period.

+ References

No definition available.

+ Details

Name:	aig_FairValueLevel3TransfersOutAtEndOfPeriodNetGainLossExcludedFromLevel3GainsLosses
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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

- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph c

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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

- Definition

Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

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

- Definition

Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

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

- Definition

Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

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

- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph c

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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

- Definition

Amount of sales of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

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

- Definition

Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

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

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=aig_LiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=aig_OtherLongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=aig_PolicyholderContractDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

FAIR VALUE MEASUREMENTS (Details - Gross components of purchases, sales, issues and settlements) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2012	Sep. 30, 2010
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, Sales, Issues and Settlements, Net, assets	$ 166	$ 978
Transfers into Level 3 at end of reporting period, net gains (losses) not included in realized and unrealized gains and losses related to Level 3 for the period	18	23	0	43
Transfers out Level 3 at end of reporting period, net gains (losses) not included in realized and unrealized gains and losses related to Level 3 for the period.	3	23	0	18
Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, liabilities	15	1
Sales, liabilities	(73)	(12)
Settlements, liabilities	62	62
Purchases, Sales, Issues and Settlements, Net, liabilities	4	51
Policyholder contract deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, liabilities	0	0
Sales, liabilities	(73)	(12)
Settlements, liabilities	22	41
Purchases, Sales, Issues and Settlements, Net, liabilities	(51)	29
Derivative liabilities, net
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, liabilities	15	1
Sales, liabilities	0	0
Settlements, liabilities	28	2
Purchases, Sales, Issues and Settlements, Net, liabilities	43	3
Long-term debt
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, liabilities	0	0
Sales, liabilities	0	0
Settlements, liabilities	12	19
Purchases, Sales, Issues and Settlements, Net, liabilities	12	19
Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	2,430	2,886
Sales, assets	(812)	(102)
Settlements, assets	(1,452)	(1,806)
Purchases, Sales, Issues and Settlements, Net, assets	166	978
Bonds available for sale
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	1,731	2,428
Sales, assets	(144)	(84)
Settlements, assets	(793)	(977)
Purchases, Sales, Issues and Settlements, Net, assets	794	1,367
Bonds available for sale \| Obligations of states, municipalities and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	107	888
Sales, assets	(22)	(5)
Settlements, assets	(20)	(37)
Purchases, Sales, Issues and Settlements, Net, assets	65	846
Bonds available for sale \| Non-U.S. government
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	6	2
Sales, assets	0	0
Settlements, assets	(2)	0
Purchases, Sales, Issues and Settlements, Net, assets	4	2
Bonds available for sale \| Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	6	56
Sales, assets	(50)	(7)
Settlements, assets	(17)	(45)
Purchases, Sales, Issues and Settlements, Net, assets	(61)	4
Bonds available for sale \| Residential mortgage backed securities (RMBS)
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	961	1,087
Sales, assets	(22)	(15)
Settlements, assets	(585)	(515)
Purchases, Sales, Issues and Settlements, Net, assets	354	557
Bonds available for sale \| Commercial mortgage-backed securities (CMBS)
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	72	65
Sales, assets	(27)	(57)
Settlements, assets	(15)	(58)
Purchases, Sales, Issues and Settlements, Net, assets	30	(50)
Bonds available for sale \| Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	579	330
Sales, assets	23	0
Settlements, assets	(154)	(322)
Purchases, Sales, Issues and Settlements, Net, assets	402	8
Other Bond securities
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	459	162
Sales, assets	(82)	(18)
Settlements, assets	(511)	(582)
Purchases, Sales, Issues and Settlements, Net, assets	(134)	(438)
Other Bond securities \| Obligations of states, municipalities and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	0	0
Sales, assets	0	0
Settlements, assets	0	0
Purchases, Sales, Issues and Settlements, Net, assets	0	0
Other Bond securities \| Non-U.S. government
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	0	0
Sales, assets	0	0
Settlements, assets	0	0
Purchases, Sales, Issues and Settlements, Net, assets	0	0
Other Bond securities \| Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	0	0
Sales, assets	0	0
Settlements, assets	0	0
Purchases, Sales, Issues and Settlements, Net, assets	0	0
Other Bond securities \| Residential mortgage backed securities (RMBS)
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	245	141
Sales, assets	(6)	(5)
Settlements, assets	(35)	(32)
Purchases, Sales, Issues and Settlements, Net, assets	204	104
Other Bond securities \| Commercial mortgage-backed securities (CMBS)
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	0	0
Sales, assets	(36)	(6)
Settlements, assets	(64)	(85)
Purchases, Sales, Issues and Settlements, Net, assets	(100)	(91)
Other Bond securities \| Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	214	21
Sales, assets	(40)	(7)
Settlements, assets	(412)	(465)
Purchases, Sales, Issues and Settlements, Net, assets	(238)	(451)
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	0	0
Sales, assets	0	0
Settlements, assets	0	0
Purchases, Sales, Issues and Settlements, Net, assets	0	0
Other invested assets
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases, assets	240	296
Sales, assets	(586)	0
Settlements, assets	(148)	(247)
Purchases, Sales, Issues and Settlements, Net, assets	$ (494)	$ 49