| Cover | May 07, 2024 |
| Document Information [Line Items] | |
| Document Type | 8-K/A |
| Amendment Flag | false |
| Document Period End Date | May 07, 2024 |
| Entity File Number | 001-31911 |
| Entity Registrant Name | AMERICAN NATIONAL GROUP INC |
| Entity Central Index Key | 0001039828 |
| Entity Tax Identification Number | 42-1447959 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 6000 Westown Parkway |
| Entity Address, City or Town | West Des Moines |
| Entity Address, State or Province | IA |
| Entity Address, Postal Zip Code | 50266 |
| City Area Code | 515 |
| Local Phone Number | 221-0002 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Series A Preferred Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares, each representing a 1/1,000th interest in a share of 5.95% Fixed-Rate Reset Non-Cumulative Preferred Stock, Series A |
| Trading Symbol | ANGpA |
| Security Exchange Name | NYSE |
| Series B Preferred Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares, each representing a 1/1,000th interest in a share of 6.625% Fixed-Rate Reset Non-Cumulative Preferred Stock, Series B |
| Trading Symbol | ANGpB |
| Security Exchange Name | NYSE |
