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Fair Values (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financial assets for which carrying values equal or approximate fair value
Cash and cash equivalents	$ 22,288,000,000us-gaap_CashCashEquivalentsAndFederalFundsSold	$ 19,486,000,000us-gaap_CashCashEquivalentsAndFederalFundsSold	$ 22,250,000,000us-gaap_CashCashEquivalentsAndFederalFundsSold	$ 24,893,000,000us-gaap_CashCashEquivalentsAndFederalFundsSold
Financial liabilities carried at other than fair value
Certificates of deposit	8,192,000,000us-gaap_TimeDeposits
Long-term debt	57,955,000,000us-gaap_LongTermDebt	55,330,000,000us-gaap_LongTermDebt
Fair Values (Textuals) [Abstract]
Accounts receivable, less reserves	44,386,000,000us-gaap_AccountsReceivableNet	43,777,000,000us-gaap_AccountsReceivableNet
Card Member loans, net	69,184,000,000us-gaap_LoansAndLeasesReceivableNetReportedAmount	65,977,000,000us-gaap_LoansAndLeasesReceivableNetReportedAmount
Variable Interest Enterprise [Member]
Financial liabilities carried at other than fair value
Long-term debt	19,516,000,000us-gaap_LongTermDebt / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	18,690,000,000us-gaap_LongTermDebt / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Fair Values (Textuals) [Abstract]
Accounts receivable, less reserves	7,000,000,000us-gaap_AccountsReceivableNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	7,300,000,000us-gaap_AccountsReceivableNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Carrying Value [Member]
Financial assets for which carrying values equal or approximate fair value
Cash and cash equivalents		19,000,000,000us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Other financial assets	48,000,000,000us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	48,000,000,000us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Financial assets carried at other than fair value
Loans, net	70,000,000,000axp_LoansNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	67,000,000,000axp_LoansNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Financial Liabilities:
Financial liabilities for which carrying values equal or approximate fair value	61,000,000,000axp_FinancialInstrumentsLiabilitiesWhichCarryingValuesEqualOrApproximateFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	60,000,000,000axp_FinancialInstrumentsLiabilitiesWhichCarryingValuesEqualOrApproximateFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Financial liabilities carried at other than fair value
Certificates of deposit		7,000,000,000us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Long-term debt	58,000,000,000us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	55,000,000,000us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets for which carrying values equal or approximate fair value
Cash and cash equivalents	22,000,000,000us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	19,000,000,000us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Other financial assets	48,000,000,000us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	48,000,000,000us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Financial assets carried at other than fair value
Loans, net	71,000,000,000axp_LoansNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	67,000,000,000axp_LoansNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Financial Liabilities:
Financial liabilities for which carrying values equal or approximate fair value	61,000,000,000axp_FinancialInstrumentsLiabilitiesWhichCarryingValuesEqualOrApproximateFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	60,000,000,000axp_FinancialInstrumentsLiabilitiesWhichCarryingValuesEqualOrApproximateFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Financial liabilities carried at other than fair value
Certificates of deposit	8,000,000,000us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	8,000,000,000us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Long-term debt	60,000,000,000us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	58,000,000,000us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Estimate of Fair Value, Fair Value Disclosure [Member] | Variable Interest Enterprise [Member]
Financial liabilities carried at other than fair value
Long-term debt	19,500,000,000us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	18,800,000,000us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Fair Values (Textuals) [Abstract]
Card Member loans, net	29,900,000,000us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	31,000,000,000us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Level 1 [Member]
Financial assets for which carrying values equal or approximate fair value
Cash and cash equivalents	21,000,000,000us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member	17,000,000,000us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Other financial assets	0us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member	0us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Financial assets carried at other than fair value
Loans, net	0axp_LoansNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member	0axp_LoansNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Financial Liabilities:
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Financial liabilities carried at other than fair value
Certificates of deposit	0us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member	0us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Long-term debt	0us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member	0us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Level 2 [Member]
Financial assets for which carrying values equal or approximate fair value
Cash and cash equivalents	1,000,000,000us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member	2,000,000,000us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Other financial assets	48,000,000,000us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member	48,000,000,000us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Financial assets carried at other than fair value
Loans, net	0axp_LoansNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member	0axp_LoansNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Financial Liabilities:
Financial liabilities for which carrying values equal or approximate fair value	61,000,000,000axp_FinancialInstrumentsLiabilitiesWhichCarryingValuesEqualOrApproximateFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member	60,000,000,000axp_FinancialInstrumentsLiabilitiesWhichCarryingValuesEqualOrApproximateFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Financial liabilities carried at other than fair value
Certificates of deposit	8,000,000,000us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member	8,000,000,000us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Long-term debt	60,000,000,000us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member	58,000,000,000us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Level 3 [Member]
Financial assets for which carrying values equal or approximate fair value
Cash and cash equivalents	0us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member
Other financial assets	0us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member
Financial assets carried at other than fair value
Loans, net	71,000,000,000axp_LoansNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member	67,000,000,000axp_LoansNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member
Financial Liabilities:
Financial liabilities for which carrying values equal or approximate fair value	0axp_FinancialInstrumentsLiabilitiesWhichCarryingValuesEqualOrApproximateFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member	0axp_FinancialInstrumentsLiabilitiesWhichCarryingValuesEqualOrApproximateFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member
Financial liabilities carried at other than fair value
Certificates of deposit	0us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member
Long-term debt	$ 0us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member	$ 0us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member

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Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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