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BUSINESS SEGMENT AND FOREIGN INFORMATION - Information on Transfers of Funds from Aflac Japan (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 (¥)
Segment Reporting [Abstract]            
Management fees $ 39afl_IntercompanyTransferManagementFeesAmount   $ 37afl_IntercompanyTransferManagementFeesAmount   $ 30afl_IntercompanyTransferManagementFeesAmount  
Allocated expenses 71afl_IntercompanyTransferAllocatedExpensesAmount   74afl_IntercompanyTransferAllocatedExpensesAmount   58afl_IntercompanyTransferAllocatedExpensesAmount  
Profit repatriation 1,704afl_IntercompanyTransferProfitRepatriationAmount 181,400afl_IntercompanyTransferProfitRepatriationAmount 771afl_IntercompanyTransferProfitRepatriationAmount 76,800afl_IntercompanyTransferProfitRepatriationAmount 422afl_IntercompanyTransferProfitRepatriationAmount 33,100afl_IntercompanyTransferProfitRepatriationAmount
Total transfers from Aflac Japan $ 1,814afl_IntercompanyTransferAmount   $ 882afl_IntercompanyTransferAmount   $ 510afl_IntercompanyTransferAmount