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NOTES PAYABLE - Aggregate Contractual Maturities of Notes Payable (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Debt Instrument [Line Items]  
2015 $ 428us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2016 201us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2017 653us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018 2us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2019 851us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Thereafter 3,150us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Total 5,285afl_LongTermDebtMaturitiesRepaymentsOfPrincipalTotal
Long-term debt  
Debt Instrument [Line Items]  
2015 424us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember
2016 197us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember
2017 650us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember
2018 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember
2019 850us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember
Thereafter 3,150us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember
Total 5,271afl_LongTermDebtMaturitiesRepaymentsOfPrincipalTotal
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember
Capitalized lease obligations  
Debt Instrument [Line Items]  
2015 4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
2016 4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
2017 3us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
2018 2us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
2019 1us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
Thereafter 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
Total $ 14afl_LongTermDebtMaturitiesRepaymentsOfPrincipalTotal
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember