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DERIVATIVE INSTRUMENTS - Derivatives and Hedging Instruments Gain (Loss) Summary (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized foreign currency translation gains (losses) during period $ 9us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax $ (57)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Derivative and other gains (losses) (49)us-gaap_GainLossOnDerivativeInstrumentsNetPretax (83)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Derivative and non-derivative hedging instruments gain loss recognized in other comprehensive income effective portion before tax (3)afl_Derivativeandnonderivativehedginginstrumentsgainlossrecognizedinothercomprehensiveincomeeffectiveportionbeforetax [1] (25)afl_Derivativeandnonderivativehedginginstrumentsgainlossrecognizedinothercomprehensiveincomeeffectiveportionbeforetax [1]
Cash flow hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
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Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) (4)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [1]
Cash flow hedges | Foreign currency swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
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Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) (4)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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Fair value hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 4us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
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= us-gaap_FairValueHedgingMember
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
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/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember		 [1]
Fair value hedges | Foreign currency forwards    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) (2)us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
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Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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= us-gaap_FairValueHedgingMember		 [1],[2]
Fair value hedges | Foreign currency options    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 3us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
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Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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= us-gaap_FairValueHedgingMember		 [1],[2]
Fair value hedges | Interest rate swaptions    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 3us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
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Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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= us-gaap_InterestRateSwaptionMember
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= us-gaap_FairValueHedgingMember		 [1],[2]
Net investment hedge    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
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Unrealized foreign currency translation gains (losses) during period 1us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
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Net investment hedge | Foreign currency forwards    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
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Unrealized foreign currency translation gains (losses) during period 2us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
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Net investment hedge | Foreign currency options    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
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Unrealized foreign currency translation gains (losses) during period 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
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Net investment hedge | Non-derivative hedging instruments    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
/ us-gaap_DerivativeInstrumentRiskAxis
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= us-gaap_NetInvestmentHedgingMember		 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
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= us-gaap_NetInvestmentHedgingMember
Unrealized foreign currency translation gains (losses) during period (1)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
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= afl_NonDerivativeHedgingInstrumentsMember
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Non-qualifying strategies    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net (53)us-gaap_DerivativeGainLossOnDerivativeNet
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Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NondesignatedMember		 [1] 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
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Non-qualifying strategies | Foreign currency swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net (57)us-gaap_DerivativeGainLossOnDerivativeNet
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Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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Non-qualifying strategies | Credit default swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net 1us-gaap_DerivativeGainLossOnDerivativeNet
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Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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Non-qualifying strategies | Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net 3us-gaap_DerivativeGainLossOnDerivativeNet
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Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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Non-qualifying strategies | Futures    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net 0us-gaap_DerivativeGainLossOnDerivativeNet
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Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) $ 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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[1] Cash flow hedge items are recorded as unrealized gains (losses) on derivatives and net investment hedge items are recorded in the unrealized foreign currency translation gains (losses) line in the consolidated statement of comprehensive income (loss).
[2] Impact shown net of effect of hedged items (see Fair Value Hedges section of this Note 4 for further detail)