v3.26.1
POLICY LIABILITIES - Schedule of Other Policyholders' Funds by Guaranteed Crediting Rates (Details) - Aflac Japan - Fixed Annuity - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
At Guaranteed Minimum [1] $ 5,005 $ 5,152 $ 5,221
Cash Surrender Value [1] $ 4,939 $ 5,083  
Weighted Average Crediting Rate 1.50% 1.50%  
Lower Limit      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Guaranteed Minimum Crediting Rates [1],[2] 0.50% 0.50%  
Upper Limit      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Guaranteed Minimum Crediting Rates [1],[2] 2.20% 2.20%  
[1] Aflac Japan fixed annuities
[2] Weighted-average crediting rate of 1.5% at March 31, 2026 and December 31, 2025.