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Customer Deposits (Details 3) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Time Deposits 250000 Or More [Line Items]
Time Deposits, $100,000 or More	$ 124	$ 106
United States [Member]
Time Deposits 250000 Or More [Line Items]
Time Deposits, $100,000 or More	117	105
Non Us [Member]
Time Deposits 250000 Or More [Line Items]
Time Deposits, $100,000 or More	$ 7	$ 1

X

- 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

X

- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section V
-Paragraph D-E

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=us-gaap_NonUsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: