| Cover | Mar. 01, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 1, 2021 |
| Entity File Number | 1-8787 |
| Entity Registrant Name | AMERICAN INTERNATIONAL GROUP, INC. |
| Entity Central Index Key | 0000005272 |
| Entity Tax Identification Number | 13-2592361 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 175 Water Street |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10038 |
| City Area Code | 212 |
| Local Phone Number | 770-7000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock, Par Value $2.50 Per Share | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common Stock, Par Value $2.50 Per Share |
| Trading Symbol | AIG |
| Security Exchange Name | NYSE |
| 5.75% Series A-2 Junior Subordinated Debentures | |
| Document Information [Line Items] | |
| Title of 12(b) Security | 5.75% Series A-2 Junior Subordinated Debentures |
| Trading Symbol | AIG 67BP |
| Security Exchange Name | NYSE |
| 4.875% Series A-3 Junior Subordinated Debentures | |
| Document Information [Line Items] | |
| Title of 12(b) Security | 4.875% Series A-3 Junior Subordinated Debentures |
| Trading Symbol | AIG 67EU |
| Security Exchange Name | NYSE |
| Stock Purchase Rights | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Stock Purchase Rights |
| No Trading Symbol Flag | true |
| Security Exchange Name | NYSE |
| Depositary Shares | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares Each Representing a 1/1,000th Interest in a Share of Series A 5.85% Non-Cumulative Perpetual Preferred Stock |
| Trading Symbol | AIG PRA |
| Security Exchange Name | NYSE |
