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REINSURANCE - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Effects of Reinsurance [Line Items]    
Future policy benefit liability $ 67,292us-gaap_LiabilityForFuturePolicyBenefits $ 65,646us-gaap_LiabilityForFuturePolicyBenefits
Aflac Japan | Closed Block- Tranche Three    
Effects of Reinsurance [Line Items]    
Coinsurance reinsurance ceded percentage 30.00%afl_ReinsuranceCededPercentage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedBlockTrancheThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		  
Reinsurance deferred profit liability 600afl_Reinsurancedeferredprofitliability
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedBlockTrancheThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		  
Reinsurance recoverables 600us-gaap_ReinsuranceRecoverables
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedBlockTrancheThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		  
Aflac Japan | Closed Medical Block - Tranche Two    
Effects of Reinsurance [Line Items]    
Coinsurance reinsurance ceded percentage 16.70%afl_ReinsuranceCededPercentage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedMedicalBlockTrancheTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		  
Reinsurance assumed percentage 8.35%afl_Reinsuranceassumedpercentage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedMedicalBlockTrancheTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		  
Future policy benefit liability 3us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedMedicalBlockTrancheTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		  
Aflac Japan | Closed Medical Block - Tranche One    
Effects of Reinsurance [Line Items]    
Coinsurance reinsurance ceded percentage 33.30%afl_ReinsuranceCededPercentage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedMedicalBlockTrancheOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		  
Aflac Japan | Closed Medical Block    
Effects of Reinsurance [Line Items]    
Reinsurance deferred profit liability 684afl_Reinsurancedeferredprofitliability
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedmedicalblockMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		  
Reinsurance recoverables $ 707us-gaap_ReinsuranceRecoverables
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedmedicalblockMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember