Loans and Accounts Receivable (Details 6) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017 USD ($) M	Sep. 30, 2016 USD ($) M	Sep. 30, 2017 USD ($) M	Sep. 30, 2016 USD ($) M
Troubled Debt Restructurings
Financing Receivable, Modifications [Line Items]
Number of Accounts	9,000	10,000	27,000	30,000
Aggregated Outstanding Balance	$ 75	$ 85	$ 224	$ 257
Card Member Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Accounts	8,000	8,000	23,000	23,000
Aggregated Outstanding Balance	$ 57	$ 56	$ 160	$ 163
Average basis point reduction in interest rate by class of Card Member loans	9.00%	9.00%	10.00%	10.00%
Card Member Receivables [Member]
Financing Receivable, Modifications [Line Items]
Number of Accounts	1,000	2,000	4,000	7,000
Aggregated Outstanding Balance	$ 18	$ 29	$ 64	$ 94
Average payment term extension \| M	31	19	27	17

The average basis point reduction in interest rate by class of cardmember loan.

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- Definition

The average period for payment term extension for cardmember receivables modified in a TDR.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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