Loans - Credit Card Loan Portfolio, Financial Effect of FDMs (Details) - Credit card - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Financing Receivable, Modified [Line Items]
Fixed payment plan period			60 months
Amortized cost basis	$ 920	$ 655	$ 2,316	$ 1,436
Term extension and interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 733	$ 562	$ 1,860	$ 1,285
% of loan modifications to total retained credit card loans	0.29%	0.24%	0.74%	0.61%
Weighted average contractual interest rate before modification	23.06%	23.06%	22.92%	23.08%
Weighted average contractual interest rate after modification	3.45%	3.48%	3.40%	3.48%
Interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 187	$ 93	$ 456	$ 151
% of loan modifications to total retained credit card loans	0.07%	0.04%	0.18%	0.06%
Weighted average contractual interest rate before modification	22.99%	23.11%	22.89%	23.03%
Weighted average contractual interest rate after modification	8.37%	8.02%	8.34%	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

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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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