INVESTMENTS (Details - Realized gains and gross realized losses from sales or maturities) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Gross Realized Gains	$ 173	$ 100	$ 266	$ 186
Gross Realized Losses	86	113	210	173
Aggregate fair value of available for sale securities sold	6,400	6,600	12,800	12,100
Net realized capital gains (losses)	87	(13)	56	13
Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Gross Realized Gains	173	100	266	170
Gross Realized Losses	86	113	210	173
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Gross Realized Gains	0	0	0	16
Gross Realized Losses	$ 0	$ 0	$ 0	$ 0

This element represents the aggregate fair value of Available-for-sale securities sold during the reporting period.

No definition available.

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

- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

No definition available.

+ Details

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

- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

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

- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

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

- Definition

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.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_EquitySecuritiesMember
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Period Type: