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2412409 - Disclosure - SHARE-BASED COMPENSATION - Restricted Stock Activity (Detail)
(http://www.aflac.com/role/ShareBasedCompensationRestrictedStockActivityDetail)
TableSchedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000004977 (http://www.sec.gov/CIK)
Award Type [Axis]Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Shares
 
 
 
Beginning balance
1,815,000  
1,880,000  
1,671,000  
Granted
878,000  
638,000  
584,000  
Canceled
(76,000) 
(145,000) 
(27,000) 
Vested
(749,000) 
(558,000) 
(348,000) 
Ending Balance
1,868,000  
 
1,815,000  
 
1,880,000  
 
Weighted-Average Grant-Date Fair Value Per Share
 
 
 
Beginning balance
58.42  
54.33  
52.12  
Granted
61.68  
61.51  
62.12  
Canceled
60.65  
57.52  
52.66  
Vested
53.68  
48.41  
56.95  
Ending Balance
61.76  
58.42  
54.33