Changes in Accumulated Other Comprehensive Income Textuals (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Other Income and Expenses [Abstract]
Amount of gain (loss) reclassified from accumulated other comprehensive income	$ 0	$ 0

Net Gain (Loss) Reclassified From Accumulated Other Comprehensive Income To Income

No definition available.

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