v3.26.1
BUSINESS SEGMENT INFORMATION - Additional Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2026
USD ($)
segment
Mar. 31, 2025
USD ($)
Dec. 31, 2025
Segment Reporting Information [Line Items]      
Number of reportable insurance business segments | segment 2    
Net earned premiums [1] $ 3,310 $ 3,381  
Aflac Re Bermuda      
Segment Reporting Information [Line Items]      
Net earned premiums $ 158 $ 178  
Aflac Japan      
Segment Reporting Information [Line Items]      
Percentage of the Company's total revenues 51.00% 53.00%  
Percentage of the Company's total assets 76.00%   76.00%
[1] Includes a gain (loss) of an immaterial amount for the three-month periods ended March 31, 2026 and 2025, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.