Significant Credit Concentrations (Details 1) - USD ($) $ in Billions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Card Member receivables and loans exposure
On-balance sheet, total	$ 19	$ 18
United States [Member]
Card Member receivables and loans exposure
On-balance sheet, total	14	13
Outside the United States [Member]
Card Member receivables and loans exposure
On-balance sheet, total	$ 5	$ 5

Reflects the maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument relating to cardmember loans and receivables, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

No definition available.

Name:	aexc_ConcentrationRiskCreditRiskFinancialInstrumentCardmemberReceivablesAndLoansExposure
Namespace Prefix:	aexc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration