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STATUTORY ACCOUNTING AND DIVIDEND RESTRICTIONS - Profits Repatriated by Aflac Japan to Aflac U.S. (Detail)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
JPY (¥)
Dec. 31, 2013
USD ($)
Dec. 31, 2013
JPY (¥)
Dec. 31, 2012
USD ($)
Dec. 31, 2012
JPY (¥)
Statutory Accounting Practices Disclosure [Abstract]            
Profit repatriation $ 1,704afl_IntercompanyTransferProfitRepatriationAmount ¥ 181,400afl_IntercompanyTransferProfitRepatriationAmount $ 771afl_IntercompanyTransferProfitRepatriationAmount ¥ 76,800afl_IntercompanyTransferProfitRepatriationAmount $ 422afl_IntercompanyTransferProfitRepatriationAmount ¥ 33,100afl_IntercompanyTransferProfitRepatriationAmount