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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Securities available for sale, equity securities, cost $ 19us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis $ 19us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Securities held to maturity, fixed maturities, fair value 38,102us-gaap_HeldToMaturitySecuritiesFairValue 38,497us-gaap_HeldToMaturitySecuritiesFairValue
Common stock, par value (in dollars per share) $ 0.1us-gaap_CommonStockParOrStatedValuePerShare $ 0.1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) 1,900,000,000us-gaap_CommonStockSharesAuthorized 1,900,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 668,854,000us-gaap_CommonStockSharesIssued 668,132,000us-gaap_CommonStockSharesIssued
Asset derivatives 706us-gaap_DerivativeAssets 802us-gaap_DerivativeAssets
Liability derivatives 599us-gaap_DerivativeLiabilities 2,423us-gaap_DerivativeLiabilities
Investments Other Than Consolidated Variable Interest Entities    
Securities available for sale, fixed maturities, amortized cost 56,098us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ dei_LegalEntityAxis
= afl_InvestmentsOtherThanConsolidatedVariableInterestEntitiesMember
55,365us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ dei_LegalEntityAxis
= afl_InvestmentsOtherThanConsolidatedVariableInterestEntitiesMember
Securities available for sale, perpetual securities, amortized cost 1,903afl_AvailableForSaleSecuritiesPerpetualSecuritiesAmortizedCost
/ dei_LegalEntityAxis
= afl_InvestmentsOtherThanConsolidatedVariableInterestEntitiesMember
2,035afl_AvailableForSaleSecuritiesPerpetualSecuritiesAmortizedCost
/ dei_LegalEntityAxis
= afl_InvestmentsOtherThanConsolidatedVariableInterestEntitiesMember
Securities held to maturity, fixed maturities, fair value 38,019us-gaap_HeldToMaturitySecuritiesFairValue
/ dei_LegalEntityAxis
= afl_InvestmentsOtherThanConsolidatedVariableInterestEntitiesMember
38,413us-gaap_HeldToMaturitySecuritiesFairValue
/ dei_LegalEntityAxis
= afl_InvestmentsOtherThanConsolidatedVariableInterestEntitiesMember
Variable Interest Entity, Consolidated    
Securities available for sale, fixed maturities, amortized cost 3,511us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
3,020us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Securities available for sale, perpetual securities, amortized cost 406afl_AvailableForSaleSecuritiesPerpetualSecuritiesAmortizedCost
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
405afl_AvailableForSaleSecuritiesPerpetualSecuritiesAmortizedCost
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Securities held to maturity, fixed maturities, fair value 83us-gaap_HeldToMaturitySecuritiesFairValue
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
84us-gaap_HeldToMaturitySecuritiesFairValue
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Asset derivatives 110us-gaap_DerivativeAssets
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
106us-gaap_DerivativeAssets
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Liability derivatives $ 392us-gaap_DerivativeLiabilities
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
$ 318us-gaap_DerivativeLiabilities
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember