Loans - Credit Card Loan Portfolio, Financial Effect of FDMs (Details) - Credit card - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Modified [Line Items]
Fixed payment plan period			60 months
Amortized cost basis	$ 655	$ 272	$ 1,436	$ 714
Term extension and interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 562	$ 272	$ 1,285	$ 714
% of loan modifications to total retained credit card loans	0.24%	0.12%	0.61%	0.33%
Weighted average contractual interest rate before modification	23.06%	23.77%	23.08%	23.89%
Weighted average contractual interest rate after modification	3.48%	3.03%	3.48%	3.12%
Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 93		$ 151
% of loan modifications to total retained credit card loans	0.04%		0.06%
Weighted average contractual interest rate before modification	23.11%		23.03%
Weighted average contractual interest rate after modification	8.02%		8.04%

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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