Fair Value (Details) - Level 2 [Member] - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Assets [Abstract]
Derivatives	$ 301,000,000	$ 156,000,000
Total assets	301,000,000	156,000,000
Liabilities [Abstract]
Derivatives	98,000,000	55,000,000
Total liabilities	$ 98,000,000	$ 55,000,000

Fair value, before effects of master netting arrangements, of a financial liability or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Includes assets not subject to a master netting arrangement.

No definition available.

Name:	aexc_FairValueOfDerivativeLiabilities
Namespace Prefix:	aexc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant