| Component: (Network and Table) | |
|---|---|
| Network | 040640 - Disclosure - Investment Securities (Details 4) (http://americanexpress.com/role/InvestmentSecuritiesDetails4)  | 
| Table | (Implied) | 
| Reporting Entity [Axis] | 0000004962 (http://www.sec.gov/CIK) | 
| Investment Securities (Details) [Abstract] | Period [Axis] | 
|---|---|
2013-12-31  | |
Investment Securities (Details) [Abstract]  | |
Contractual maturities of investment securities  | |
Available For Sale Securities Debt Maturities Amortized Cost [Abstract]  | |
Due within 1 year  | |
Due after 1 year but within 5 years  | |
Due after 5 years but within 10 years  | |
Due after 10 years  | |
Total  | |
Estimated Fair Value  | |
Estimated Fair Value, Due within 1 year  | |
Estimated Fair Value, Due after 1 year but within 5 years  | |
Estimated Fair Value, Due after 5 years but within 10 years  | |
Estimated Fair Value, Due after 10 years  | |
Total  |