v3.26.1
BUSINESS SEGMENT INFORMATION - Operations by Segment - Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 116,280 $ 116,470
Aflac Japan    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 88,446 88,537
Aflac U.S.    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 22,587 22,317
Corporate and other    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 5,247 $ 5,616