Changes in Accumulated Other Comprehensive Income (Loss) (Details Textuals) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Loss Income (Textuals) [Abstract]
Amount of gain loss reclassified from accumulated other comprehensive income to income	$ 0	$ 0

Net gain (loss) reclassified from accumulated other comprehensive income into income.

No definition available.

Name:	aexc_NetGainLossReclassifiedFromAccumulatedOtherComprehensiveIncomeToIncome
Namespace Prefix:	aexc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration