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BUSINESS SEGMENT AND FOREIGN INFORMATION - Operations by Segment - Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 118,296 $ 119,767 $ 121,307
Aflac Japan      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 97,646 98,525 102,973
Aflac U.S.      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 18,537 18,383 16,112
Other business segments      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 188 128 155
Total Business Segments      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 116,371 117,036 119,240
Corporate      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 23,415 24,636 19,909
Intercompany eliminations      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ (21,490) $ (21,905) $ (17,842)