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SUBSEQUENT EVENTS -Additional Information (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended
Apr. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Apr. 01, 2015
8.50% senior notes due May 2019        
Subsequent Event [Line Items]        
Debt instrument, interest rate, stated percentage   8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesEightPointFiveZeroPercentDueMayTwentyNineteenMember		 8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesEightPointFiveZeroPercentDueMayTwentyNineteenMember		  
Subsequent Event | 8.50% senior notes due May 2019        
Subsequent Event [Line Items]        
Principal payments under debt obligations $ 850us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesEightPointFiveZeroPercentDueMayTwentyNineteenMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Debt instrument, interest rate, stated percentage       8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesEightPointFiveZeroPercentDueMayTwentyNineteenMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Payment of debt, make-whole premium $ 230afl_PaymentofDebtMakeWholePremium
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesEightPointFiveZeroPercentDueMayTwentyNineteenMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Aflac Japan | Closed Block- Tranche Three | Subsequent Event        
Subsequent Event [Line Items]        
Reinsurance assumed percentage       90.00%afl_Reinsuranceassumedpercentage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= afl_ClosedBlockTrancheThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember