Loans - Credit Card Loan Portfolio, Financial Effect of FDMs (Details) - Credit card - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Financing Receivable, Modified [Line Items]
Fixed payment plan period	60 months
Amortized cost basis	$ 853	$ 381
Term extension and interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 689	$ 376
% of loan modifications to total retained credit card loans	0.29%	0.17%
Weighted average contractual interest rate before modification	22.76%	23.04%
Weighted average contractual interest rate after modification	3.39%	3.53%
Interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 164	$ 5
% of loan modifications to total retained credit card loans	0.07%	0.00%
Weighted average contractual interest rate before modification	22.77%	20.95%
Weighted average contractual interest rate after modification	8.23%	8.61%

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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