Loans - Credit Card Loan Portfolio, Financial Effect of FDMs (Details) - Credit card - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, Modified [Line Items]
Fixed payment plan period			60 months
Amortized cost basis	$ 521	$ 259	$ 867	$ 491
Term extension and interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 462	$ 259	$ 803	$ 491
% of loan modifications to total retained credit card loans	0.20%	0.12%	0.37%	0.23%
Weighted average contractual interest rate before modification	23.12%	23.89%	23.09%	23.88%
Weighted average contractual interest rate after modification	3.45%	3.04%	3.48%	3.17%
Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 59		$ 64
% of loan modifications to total retained credit card loans	0.03%		0.03%
Weighted average contractual interest rate before modification	23.10%		22.93%
Weighted average contractual interest rate after modification	8.01%		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.

+ 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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