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Network
2410407 - Disclosure - INCOME TAXES - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail)
(http://www.aflac.com/role/IncomeTaxesReconciliationOfBeginningAndEndingAmountOfUnrecognizedTaxBenefitsDetail)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000004977 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Income Tax Disclosure [Abstract]
 
 
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
 
 
Balance, beginning of year
264,000,000  
309,000,000  
Additions for tax positions of prior years
33,000,000  
0  
Reductions for tax positions of prior years
(3,000,000) 
(45,000,000) 
Balance, end of year
294,000,000  
 
264,000,000