v3.25.2
BUSINESS SEGMENT INFORMATION - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
segment
Jun. 30, 2024
USD ($)
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Number of reportable insurance business segments | segment     2    
Net earned premiums [1] $ 3,470 $ 3,325 $ 6,851 $ 6,781  
Aflac Re Bermuda          
Segment Reporting Information [Line Items]          
Net earned premiums $ 178 $ 128 $ 356 $ 264  
Aflac Japan          
Segment Reporting Information [Line Items]          
Percentage of the Company's total revenues 54.00% 56.00% 54.00% 56.00%  
Percentage of the Company's total assets 77.00%   77.00%   77.00%
[1] Includes a gain (loss) of an immaterial amount and $(2) for the three-month periods and an immaterial amount and $(5) for the six-month periods ended June 30, 2025 and 2024, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.