Loans - Credit Card Loan Portfolio, Financial Effect of FDMs (Details) - Credit card - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Modified [Line Items]
Fixed payment plan period			60 months
Term extension and interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 272	$ 197	$ 714	$ 489
% of total modifications to total retained credit card loans	0.12%	0.10%	0.33%	0.25%
Weighted average contractual interest rate before modification	23.77%	23.48%	23.89%	23.15%
Weighted average contractual interest rate after modification	3.03%	3.67%	3.12%	3.58%

Financing Receivable, Modified, Weighted-Average Interest Rate After Modification During Period

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- Definition

Financing Receivable, Modified, Weighted-Average Interest Rate Before Modification During Period

+ References

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- Definition

The duration period for placing customers on a fixed payment plan as a result of a credit card loan modification program.

+ References

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- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

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- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

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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.

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