Loans and Card Member Receivables (Details 5) account in Thousands, $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) account	Mar. 31, 2019 USD ($) account
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Accounts \| account	27	19
Outstanding Balances \| $	$ 269	$ 168
Card Member Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Accounts \| account	24	17
Outstanding Balances \| $	$ 195	$ 128
Average Interest Rate Reduction (as a percentage)	14.00%	13.00%
Card Member Receivables [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Accounts \| account	3	2
Outstanding Balances \| $	$ 74	$ 40
Average Payment Term Extension (in months)	25 months	27 months

The average basis point reduction in interest rate by class of Financial Instrument

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
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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.

+ Details

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

+ Details

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- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

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- Details

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Namespace Prefix:
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Period Type: