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Customer Deposits (Details 3) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Time Deposits 250000 Or More [Line Items] |  |
Time Deposits of $250,000 or more | $ 999 | $ 522
United States |  |
Time Deposits 250000 Or More [Line Items] |  |
Time Deposits of $250,000 or more | 998 | 521
Non-US |  |
Time Deposits 250000 Or More [Line Items] |  |
Time Deposits of $250,000 or more | $ 1 | $ 1

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- Definition Certificates of deposit in denominations of $250,000 or more, in the aggregate + References No definition available. + Details
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Namespace Prefix: | axp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=us-gaap_NonUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |