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COMMITMENTS AND CONTINGENT LIABILITIES - Additional Information (Details) $ in Millions | Sep. 30, 2016 USD ($)
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Other Commitments [Line Items] |
Middle market loan commitment | $ 409
Commercial mortgage loan commitments | $ 185

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- Definition Commercial Mortgage Loan Commitments + References No definition available. + Details
Name: | afl_CommercialMortgageLoanCommitments
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Middle Market Loan Commitment + References No definition available. + Details
Name: | afl_MiddleMarketLoanCommitment
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration