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Summary of Significant Accounting Policies - Discount Revenue (Details) | 12 Months Ended
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Dec. 31, 2020
Minimum [Member] |
Disaggregation of Revenue [Line Items] |
Contract terms with large merchants | 3 years
Maximum [Member] |
Disaggregation of Revenue [Line Items] |
Contract terms with large merchants | 7 years

X
- Definition Contract with Customer, Contract Term + References No definition available. + Details
Name: | axp_ContractWithCustomerContractTerm
Namespace Prefix: | axp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |