Restrictions as to Dividends and Limitations on Indebtness (Details Textual) $ in Millions	Dec. 31, 2016 USD ($)
RestrictionsTextuals[Abstract]
Minimum consolidated net worth	$ 50
Line of credit facility financial covenants combined earnings and fixed charges to fixed charges ratio required	1.25

Ratio of combined earnings and fixed earnings to fixed charges American Express Credit Corporation (Credco) is subject to in order to maintain the availability of its credit lines.

No definition available.

Name:	aexc_CombinedEarningsAndFixedChargesToFixedChargesRatioRequired
Namespace Prefix:	aexc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant