Loans - Credit Card Portfolio, Financial Effects of Modifications and Redefaults (Details) - Credit card - USD ($)	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]
New enrollments, percent of total retained credit card loans (less than)		1.00%
Balance of new TDRs		$ 82,000,000
Weighted-average interest rate of loans – before TDR		18.00%
Weighted-average interest rate of loans – after TDR		4.87%
Balance of loans that redefaulted within one year of modification	$ 0	$ 9,000,000
Number of years before payment default under a modified loan		1 year

Financing Receivable, Modifications, New Enrollments, Percentage of Total Loans

No definition available.

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- Definition

Weighted-average interest rate of financing receivables with rate reductions (after modification), that have been modified by troubled debt restructurings that occurred.

+ References

No definition available.

+ Details

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- Definition

Weighted-average interest rate of financing receivables with rate reductions (before modification), that have been modified by troubled debt restructurings that occurred.

+ References

No definition available.

+ Details

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- Definition

The number of years before a payment default under a modified loan.

+ References

No definition available.

+ Details

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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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- Definition

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

+ 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 https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

+ Details

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- Definition

Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524

+ Details

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- Details

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