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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Securities available for sale, equity securities, cost $ 19us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis $ 17us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Securities held to maturity, fixed maturities, fair value 38,497us-gaap_HeldToMaturitySecuritiesFairValue 45,846us-gaap_HeldToMaturitySecuritiesFairValue
Common stock, par value (in dollars per share) $ 0.10us-gaap_CommonStockParOrStatedValuePerShare $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) 1,900,000us-gaap_CommonStockSharesAuthorized 1,900,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 668,132us-gaap_CommonStockSharesIssued 667,046us-gaap_CommonStockSharesIssued
Asset derivatives 802us-gaap_DerivativeAssets 488us-gaap_DerivativeAssets
Liability derivatives 2,423us-gaap_DerivativeLiabilities 837us-gaap_DerivativeLiabilities
Investments Other Than Consolidated Variable Interest Entities    
Securities available for sale, fixed maturities, amortized cost 55,365us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ dei_LegalEntityAxis
= afl_InvestmentsOtherThanConsolidatedVariableInterestEntitiesMember
52,402us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ dei_LegalEntityAxis
= afl_InvestmentsOtherThanConsolidatedVariableInterestEntitiesMember
Securities available for sale, perpetual securities, amortized cost 2,035afl_AvailableForSaleSecuritiesPerpetualSecuritiesAmortizedCost
/ dei_LegalEntityAxis
= afl_InvestmentsOtherThanConsolidatedVariableInterestEntitiesMember
2,524afl_AvailableForSaleSecuritiesPerpetualSecuritiesAmortizedCost
/ dei_LegalEntityAxis
= afl_InvestmentsOtherThanConsolidatedVariableInterestEntitiesMember
Securities held to maturity, fixed maturities, fair value 38,413us-gaap_HeldToMaturitySecuritiesFairValue
/ dei_LegalEntityAxis
= afl_InvestmentsOtherThanConsolidatedVariableInterestEntitiesMember
45,610us-gaap_HeldToMaturitySecuritiesFairValue
/ dei_LegalEntityAxis
= afl_InvestmentsOtherThanConsolidatedVariableInterestEntitiesMember
Variable Interest Entity, Consolidated    
Securities available for sale, fixed maturities, amortized cost 3,020us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
4,109us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Securities available for sale, perpetual securities, amortized cost 405afl_AvailableForSaleSecuritiesPerpetualSecuritiesAmortizedCost
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
463afl_AvailableForSaleSecuritiesPerpetualSecuritiesAmortizedCost
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Securities held to maturity, fixed maturities, fair value 84us-gaap_HeldToMaturitySecuritiesFairValue
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
236us-gaap_HeldToMaturitySecuritiesFairValue
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Asset derivatives 106us-gaap_DerivativeAssets
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
106us-gaap_DerivativeAssets
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Liability derivatives $ 318us-gaap_DerivativeLiabilities
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
$ 207us-gaap_DerivativeLiabilities
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember