Loans - Credit Card Loan Portfolio, Financial Effect of FDMs (Details) - Credit card - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable, Modified [Line Items]
Fixed payment plan period			60 months
Amortized cost basis	$ 799	$ 521	$ 1,562	$ 867
Term extension and interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 648	$ 462	$ 1,262	$ 803
% of loan modifications to total retained credit card loans	0.26%	0.20%	0.51%	0.37%
Weighted average contractual interest rate before modification	22.92%	23.12%	22.84%	23.09%
Weighted average contractual interest rate after modification	3.35%	3.45%	3.37%	3.48%
Interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 151	$ 59	$ 300	$ 64
% of loan modifications to total retained credit card loans	0.06%	0.03%	0.12%	0.03%
Weighted average contractual interest rate before modification	22.79%	23.10%	22.77%	22.93%
Weighted average contractual interest rate after modification	8.39%	8.01%	8.30%	8.06%

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.

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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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