Finance Receivables - Schedule of Finance Charges and Fees Reversed on Credit Cards (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Credit Cards \| Nonperforming (Nonaccrual)
Financing Receivable, Modified [Line Items]
Net accrued finance charges and fees reversed	$ 18	$ 8	$ 35	$ 14

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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