Card Member Receivables and Loans (Details 2) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
U.S. Card Services [Member] \| Card Member Receivables [Member]
Financing receivable recorded investment aging
Current	$ 4,762	$ 2,729
30 to 59 days past due	17	12
60 to 89 days past due	8	5
90+ days past due	13	9
Total aging	4,800	2,755
International Card Services [Member] \| Card Member Receivables [Member]
Financing receivable recorded investment aging
Current	2,088	1,296
30 to 59 days past due	9	8
60 to 89 days past due	6	4
90+ days past due	10	8
Total aging	2,113	1,316
International Card Services [Member] \| Card Member Loans [Member]
Financing receivable recorded investment aging
Current	414	399
30 to 59 days past due	1	1
60 to 89 days past due	1	0
90+ days past due	1	1
Total aging	417	401
Global Commercial Services [Member] \| Card Member Receivables [Member]
Financing receivable recorded investment aging
90+ days past due	86	89
Total aging	$ 11,856	$ 10,436

Recorded investment in financing receivables that are current and past due at the balance sheet date.

No definition available.

Name:	aexc_FinancingReceivableRecordedInvestmentCurrentAndPastDue
Namespace Prefix:	aexc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing receivables that are current.

+ References

No definition available.

+ Details

Name:	aexc_FinancingReceivableRecordedInvestmentsCurrent
Namespace Prefix:	aexc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing receivables that are less than 60 days past due but more than 29 days past due.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing receivables that are less than 90 days past due but more than 59 days past due.

+ References

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing receivables that are equal to or greater than 90 days past due.

+ References

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=aexc_UsConsumerAndSmallBusinessServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=aexc_CardmemberReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=aexc_InternationalCardServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=aexc_CardmemberLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=aexc_GlobalCommercialServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: