{"cik":4977,"taxonomy":"us-gaap","tag":"StockholdersEquityNoteStockSplitConversionRatio1","label":"Stockholders' Equity Note, Stock Split, Conversion Ratio","description":"Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.","entityName":"Aflac Incorporated","units":{"pure":[{"end":"2018-02-13","val":2,"accn":"0000004977-18-000073","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-04"},{"end":"2018-02-13","val":2,"accn":"0000004977-18-000114","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03"},{"end":"2018-02-13","val":2,"accn":"0000004977-18-000152","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-01"},{"end":"2018-02-13","val":2,"accn":"0000004977-19-000049","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-25","frame":"CY2017Q4I"}]}}