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REINSURANCE Additional Information (Detail) (Aflac Japan, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Closed Medical Block - Tranche Two
  
Effects of Reinsurance [Line Items]  
Reinsurance ceded percentage 16.70%afl_ReinsuranceCededPercentage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedMedicalBlockTrancheTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember
Closed Medical Block - Tranche One
  
Effects of Reinsurance [Line Items]  
Reinsurance ceded percentage 33.30%afl_ReinsuranceCededPercentage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedMedicalBlockTrancheOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember
Closed medical block
  
Effects of Reinsurance [Line Items]  
Reinsurance deferred profit liability 820afl_Reinsurancedeferredprofitliability
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedmedicalblockMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember
Reinsurance recoverables 838us-gaap_ReinsuranceRecoverables
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedmedicalblockMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember
Reinsurance assumed percentage 8.35%afl_Reinsuranceassumedpercentage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedmedicalblockMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember