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NOTES PAYABLE - Summary of Notes Payable (Parenthetical) (Details)
In Millions, unless otherwise specified
Mar. 31, 2015
8.50% senior notes due May 2019
Dec. 31, 2014
8.50% senior notes due May 2019
Mar. 31, 2015
6.45% senior notes due August 2040
Dec. 31, 2014
6.45% senior notes due August 2040
Mar. 31, 2015
3.45% senior notes due August 2015
Dec. 31, 2014
3.45% senior notes due August 2015
Mar. 31, 2015
2.65% senior notes due February 2017
USD ($)
Dec. 31, 2014
2.65% senior notes due February 2017
Mar. 31, 2015
4.00% senior notes due February 2022
USD ($)
Dec. 31, 2014
4.00% senior notes due February 2022
Mar. 31, 2015
3.625% senior notes due June 2023
USD ($)
Dec. 31, 2014
3.625% senior notes due June 2023
Mar. 31, 2015
3.25% senior notes due March 2025
USD ($)
Mar. 31, 2015
6.90% senior notes due December 2039
Dec. 31, 2014
6.90% senior notes due December 2039
Mar. 31, 2015
2.40% senior notes due March 2020
USD ($)
Mar. 31, 2015
5.50% subordinated notes due September 2052
USD ($)
Dec. 31, 2014
5.50% subordinated notes due September 2052
Mar. 31, 2015
2.26% yen-denominated Uridashi notes due September 2016
JPY (¥)
Dec. 31, 2014
2.26% yen-denominated Uridashi notes due September 2016
JPY (¥)
Mar. 31, 2015
3.625% senior notes due November 2024
USD ($)
Dec. 31, 2014
3.625% senior notes due November 2024
Mar. 31, 2015
1.84% yen-denominated Samurai notes due July 2016
JPY (¥)
Dec. 31, 2014
1.84% yen-denominated Samurai notes due July 2016
JPY (¥)
Mar. 31, 2015
3.60% yen-denominated loan due July 2015
JPY (¥)
Dec. 31, 2014
3.60% yen-denominated loan due July 2015
JPY (¥)
Mar. 31, 2015
3.00% yen-denominated loan due August 2015
JPY (¥)
Dec. 31, 2014
3.00% yen-denominated loan due August 2015
JPY (¥)
Mar. 31, 2015
50 billion yen line of credit
JPY (¥)
Mar. 31, 2015
$50 million dollar line of credit
USD ($)
Mar. 31, 2015
$100 million dollar line of credit
USD ($)
Debt Instrument [Line Items]                                                              
Notes payable, interest rate 8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesEightPointFiveZeroPercentDueMayTwentyNineteenMember
8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesEightPointFiveZeroPercentDueMayTwentyNineteenMember
6.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesSixPointFourFivePercentDueAugustTwentyFortyMember
6.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesSixPointFourFivePercentDueAugustTwentyFortyMember
3.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesThreePointFourFivePercentDueAugustTwentyFifteenMember
3.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesThreePointFourFivePercentDueAugustTwentyFifteenMember
2.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesTwoPointSixFivePercentDueFebruaryTwentySeventeenMember
2.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesTwoPointSixFivePercentDueFebruaryTwentySeventeenMember
4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesFourPointZeroZeroPercentDueFebruaryTwentyTwentyTwoMember
4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesFourPointZeroZeroPercentDueFebruaryTwentyTwentyTwoMember
3.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesThreePointSixTwoFivePercentDueJuneTwentyTwentyThreeMember
3.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesThreePointSixTwoFivePercentDueJuneTwentyTwentyThreeMember
3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesThreePointTwoFivePercentDueMarchTwentyTwentyFiveMember
6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesSixPointNineZeroPercentDueDecemberTwentyThirtyNineMember
6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesSixPointNineZeroPercentDueDecemberTwentyThirtyNineMember
2.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesTwoPointFourZeroPercentDueMarchTwentyTwentyMember
5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SubordinatedNotesFivePointFiveZeroPercentDueSeptemberTwentyFiftyTwoMember
5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SubordinatedNotesFivePointFiveZeroPercentDueSeptemberTwentyFiftyTwoMember
2.26%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedUridashiNotesTwoPointTwoSixPercentDueSeptemberTwentySixteenMember
2.26%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedUridashiNotesTwoPointTwoSixPercentDueSeptemberTwentySixteenMember
3.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesThreePointSixTwoFivePercentDueNovemberTwentyTwentyFourMember
3.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesThreePointSixTwoFivePercentDueNovemberTwentyTwentyFourMember
1.84%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedSamuraiNotesOnePointEightFourPercentDueJulyTwentySixteenMember
1.84%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedSamuraiNotesOnePointEightFourPercentDueJulyTwentySixteenMember
3.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedLoanThreePointSixZeroPercentDueJulyTwentyFifteenMember
3.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedLoanThreePointSixZeroPercentDueJulyTwentyFifteenMember
3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedLoanThreePointZeroZeroPercentDueAugustTwentyFifteenMember
3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedLoanThreePointZeroZeroPercentDueAugustTwentyFifteenMember
     
Notes payable, principal amount             $ 400us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesTwoPointSixFivePercentDueFebruaryTwentySeventeenMember
  $ 350us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesFourPointZeroZeroPercentDueFebruaryTwentyTwentyTwoMember
  $ 700us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesThreePointSixTwoFivePercentDueJuneTwentyTwentyThreeMember
  $ 450us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesThreePointTwoFivePercentDueMarchTwentyTwentyFiveMember
    $ 550us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesTwoPointFourZeroPercentDueMarchTwentyTwentyMember
$ 500us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_SubordinatedNotesFivePointFiveZeroPercentDueSeptemberTwentyFiftyTwoMember
  ¥ 8,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedUridashiNotesTwoPointTwoSixPercentDueSeptemberTwentySixteenMember
¥ 8,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedUridashiNotesTwoPointTwoSixPercentDueSeptemberTwentySixteenMember
$ 750us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_SeniorNotesThreePointSixTwoFivePercentDueNovemberTwentyTwentyFourMember
  ¥ 15,800us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedSamuraiNotesOnePointEightFourPercentDueJulyTwentySixteenMember
¥ 15,800us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedSamuraiNotesOnePointEightFourPercentDueJulyTwentySixteenMember
¥ 10,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedLoanThreePointSixZeroPercentDueJulyTwentyFifteenMember
¥ 10,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedLoanThreePointSixZeroPercentDueJulyTwentyFifteenMember
¥ 5,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedLoanThreePointZeroZeroPercentDueAugustTwentyFifteenMember
¥ 5,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedLoanThreePointZeroZeroPercentDueAugustTwentyFifteenMember
     
Line of credit facility, amount outstanding                                                         ¥ 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= afl_FiftybillionyenlineofcreditMember
$ 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= afl_FiftymilliondollarlineofcreditMember
$ 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= afl_OnehundredmilliondollarlineofcreditMember