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Loans and Card Member Receivables (Details 5) account in Thousands, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($) account | Mar. 31, 2019 USD ($) account
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Accounts | account | 27 | 19
Outstanding Balances | $ | $ 269 | $ 168
Card Member Loans [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Accounts | account | 24 | 17
Outstanding Balances | $ | $ 195 | $ 128
Average Interest Rate Reduction (as a percentage) | 14.00% | 13.00%
Card Member Receivables [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Accounts | account | 3 | 2
Outstanding Balances | $ | $ 74 | $ 40
Average Payment Term Extension (in months) | 25 months | 27 months

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- Definition The average basis point reduction in interest rate by class of Financial Instrument + References No definition available. + Details
Name: | axp_AverageInterestRateReductionByClassOfFinancialInstrument
Namespace Prefix: | axp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The average period for payment term extension for cardmember receivables modified in a TDR. + References No definition available. + Details
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Namespace Prefix: | axp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |