XML 12 R1.htm IDEA: XBRL DOCUMENT v3.25.3
Cover - shares
 9 Months Ended
Sep. 30, 2025
Nov. 12, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2025  
Document Transition Report false  
Entity File Number 001-31911  
Entity Registrant Name American National Group Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 42-1447959  
Entity Address, Address Line One One Moody Plaza  
Entity Address, City or Town Galveston  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77550  
City Area Code 888  
Local Phone Number 221-1234  
Title of 12(b) Security Depositary Shares, each representing a 1/1,000th interest in a share of 7.375% Fixed-Rate Non-Cumulative Preferred Stock, Series D  
Trading Symbol ANGpD  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   10,000
Entity Central Index Key 0001039828  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31  
Amendment Flag false