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Customer Deposits (Details 3) - USD ($) $ in Millions | Jun. 30, 2015 | Jun. 30, 2014
--- | --- | ---
Time Deposits $250,000 Or More [Abstract] |  |
U.S. | $ 105 | $ 111
Non-U.S. | 18 | 17
Total | $ 123 | $ 128

X
- Definition Represent Certificates of Deposits in denominations of $250,000 + References No definition available. + Details
Name: | axp_TimeDeposits250000OrMore
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represent Certificates of Deposits in denominations of $250,000 or more + References No definition available. + Details
Name: | axp_TimeDeposits250000OrMoreAbstract
Namespace Prefix: | axp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represent Domestic Certificates of Deposits in denominations of $250,000 or more + References No definition available. + Details
Name: | axp_TimeDeposits250000OrMoreDomestic
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represent Foreign Certificates of Deposits in denominations of $250,000 or more + References No definition available. + Details
Name: | axp_TimeDeposits250000OrMoreForeign
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant