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BUSINESS SEGMENT AND FOREIGN INFORMATION - Operations by Segment - Revenues (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net earned premiums $ 4,489us-gaap_PremiumsEarnedNet $ 4,841us-gaap_PremiumsEarnedNet $ 4,888us-gaap_PremiumsEarnedNet $ 4,854us-gaap_PremiumsEarnedNet $ 4,910us-gaap_PremiumsEarnedNet $ 5,028us-gaap_PremiumsEarnedNet $ 5,013us-gaap_PremiumsEarnedNet $ 5,184us-gaap_PremiumsEarnedNet $ 19,072us-gaap_PremiumsEarnedNet $ 20,135us-gaap_PremiumsEarnedNet $ 22,148us-gaap_PremiumsEarnedNet
Net investment income 808us-gaap_NetInvestmentIncome 841us-gaap_NetInvestmentIncome 843us-gaap_NetInvestmentIncome 827us-gaap_NetInvestmentIncome 826us-gaap_NetInvestmentIncome 821us-gaap_NetInvestmentIncome 813us-gaap_NetInvestmentIncome 833us-gaap_NetInvestmentIncome 3,319us-gaap_NetInvestmentIncome 3,293us-gaap_NetInvestmentIncome 3,473us-gaap_NetInvestmentIncome
Other income 74us-gaap_OtherIncome 38us-gaap_OtherIncome 5us-gaap_OtherIncome 5us-gaap_OtherIncome 45us-gaap_OtherIncome 15us-gaap_OtherIncome 17us-gaap_OtherIncome 35us-gaap_OtherIncome 122us-gaap_OtherIncome 112us-gaap_OtherIncome 92us-gaap_OtherIncome
Total revenues 5,514us-gaap_Revenues 5,736us-gaap_Revenues 5,838us-gaap_Revenues 5,640us-gaap_Revenues 5,801us-gaap_Revenues 5,886us-gaap_Revenues 6,044us-gaap_Revenues 6,208us-gaap_Revenues 22,728us-gaap_Revenues 23,939us-gaap_Revenues 25,364us-gaap_Revenues
Realized investment gains (losses), non-operating                 171afl_GainLossOnInvestmentsNonoperating [1] 389afl_GainLossOnInvestmentsNonoperating [1] (349)afl_GainLossOnInvestmentsNonoperating
Other non-operating income (loss)                 67us-gaap_OtherNonoperatingIncomeExpense 28us-gaap_OtherNonoperatingIncomeExpense (7)us-gaap_OtherNonoperatingIncomeExpense
Gain (loss) on change in fair value of derivative, interest rate component, operating                 44afl_GainLossOnChangeInFairValueOfDerivativeInterestRateComponentOperating 10afl_GainLossOnChangeInFairValueOfDerivativeInterestRateComponentOperating  
Aflac Japan                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net earned premiums                 13,861us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 14,982us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 17,151us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember
Net investment income                 2,662us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 2,651us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 2,845us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember
Other income                 32us-gaap_OtherIncome
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 55us-gaap_OtherIncome
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 57us-gaap_OtherIncome
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember
Total revenues                 16,555us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 17,688us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 20,053us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember
Aflac Japan | Cancer                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net earned premiums                 5,596us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_CancerMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 6,123us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_CancerMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 7,537us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_CancerMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember
Aflac Japan | Medical and other health                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net earned premiums                 3,770us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_MedicalAndOtherHealthMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 4,282us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_MedicalAndOtherHealthMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 5,244us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_MedicalAndOtherHealthMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember
Aflac Japan | Life insurance                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net earned premiums                 4,495us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 4,577us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember		 4,370us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacJapanMember
Aflac U.S.                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net earned premiums                 5,211us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 5,153us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 4,996us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember
Net investment income                 645us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 632us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 613us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember
Other income                 3us-gaap_OtherIncome
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 6us-gaap_OtherIncome
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 19us-gaap_OtherIncome
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember
Total revenues                 5,859us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 5,791us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 5,628us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember
Aflac U.S. | Cancer                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net earned premiums                 1,279us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_CancerMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 1,283us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_CancerMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 1,282us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_CancerMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember
Aflac U.S. | Life insurance                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net earned premiums                 258us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 252us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 242us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember
Aflac U.S. | Accident and disability                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net earned premiums                 2,303us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_AccidentAndDisabilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 2,284us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_AccidentAndDisabilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 2,213us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_AccidentAndDisabilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember
Aflac U.S. | Other health                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net earned premiums                 1,371us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_OtherHealthMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 1,334us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_OtherHealthMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember		 1,259us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= afl_OtherHealthMember
/ us-gaap_StatementBusinessSegmentsAxis
= afl_AflacUsMember
Other business segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total revenues                 43us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 49us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 46us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Total Business Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total revenues                 22,457us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 23,528us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 25,727us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember
Corporate                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total revenues                 281us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 302us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 269us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Intercompany eliminations                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total revenues                 $ (248)us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ConsolidationEliminationsMember		 $ (308)us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ConsolidationEliminationsMember		 $ (276)us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ConsolidationEliminationsMember
[1] Excluding a gain of $44 in 2014 and $10 in 2013 related to the interest rate component of the change in fair value of foreign currency swaps on notes payable which is classified as an operating gain when analyzing segment operations