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Asset Securitizations (Details Textuals) - USD ($) $ in Billions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
American Express Lending Trust [Member] |  |
Securitized Trusts [Line Items] |  |
Direct and Indirect ownership of variable interests | $ 11.3 | $ 12.9
American Express Charge Trust [Member] |  |
Securitized Trusts [Line Items] |  |
Direct and Indirect ownership of variable interests | $ 4.0 | $ 8.3

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- Definition Direct and Indirect ownership of variable interests with the exception of the debt securities issued to third party investors. + References No definition available. + Details
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Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition SecuritizedTrustsLineItems + References No definition available. + Details
Name: | axp_SecuritizedTrustsLineItems
Namespace Prefix: | axp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=axp_AmericanExpressLendingTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=axp_AmericanExpressChargeTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |