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Significant Credit Concentrations (Details 1) (USD $) In Billions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Card Member loans and receivables exposure |  |
On-balance sheet | $ 115 axp_ConcentrationRiskCreditRiskFinancialInstrumentCardMemberReceivablesAndLoansExposure | $ 111 axp_ConcentrationRiskCreditRiskFinancialInstrumentCardMemberReceivablesAndLoansExposure
Individuals [Member] |  |
Card Member loans and receivables exposure |  |
Unused lines-of-credit | 278 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_ConcentrationRiskByTypeAxis = axp_IndividualsMember | 265 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_ConcentrationRiskByTypeAxis = axp_IndividualsMember
U.S. [Member] |  |
Card Member loans and receivables exposure |  |
On-balance sheet | 94 axp_ConcentrationRiskCreditRiskFinancialInstrumentCardMemberReceivablesAndLoansExposure / us-gaap_StatementGeographicalAxis = axp_DomesticMember | 89 axp_ConcentrationRiskCreditRiskFinancialInstrumentCardMemberReceivablesAndLoansExposure / us-gaap_StatementGeographicalAxis = axp_DomesticMember
U.S. [Member] | Individuals [Member] |  |
Card Member loans and receivables exposure |  |
Unused lines-of-credit | 234 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_ConcentrationRiskByTypeAxis = axp_IndividualsMember / us-gaap_StatementGeographicalAxis = axp_DomesticMember | 219 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_ConcentrationRiskByTypeAxis = axp_IndividualsMember / us-gaap_StatementGeographicalAxis = axp_DomesticMember
Non-U.S. [Member] |  |
Card Member loans and receivables exposure |  |
On-balance sheet | 21 axp_ConcentrationRiskCreditRiskFinancialInstrumentCardMemberReceivablesAndLoansExposure / us-gaap_StatementGeographicalAxis = axp_InternationalMember | 22 axp_ConcentrationRiskCreditRiskFinancialInstrumentCardMemberReceivablesAndLoansExposure / us-gaap_StatementGeographicalAxis = axp_InternationalMember
Non-U.S. [Member] | Individuals [Member] |  |
Card Member loans and receivables exposure |  |
Unused lines-of-credit | $ 44 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_ConcentrationRiskByTypeAxis = axp_IndividualsMember / us-gaap_StatementGeographicalAxis = axp_InternationalMember | $ 46 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_ConcentrationRiskByTypeAxis = axp_IndividualsMember / us-gaap_StatementGeographicalAxis = axp_InternationalMember

X
- Definition Reflects the maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument relating to Card Member loans and receivables, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References No definition available. + Details
Name: | axp_ConcentrationRiskCreditRiskFinancialInstrumentCardMemberReceivablesAndLoansExposure
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | axp_ConcentrationRiskCreditRiskFinancialInstrumentsAbstract
Namespace Prefix: | axp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
Name: | us-gaap_UnusedCommitmentsToExtendCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=axp_IndividualsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=axp_DomesticMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=axp_InternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |