Finance Receivables - Schedule of Modified Financing Receivables Days Delinquent (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	$ 689	$ 699
Finance receivables subsequently charged off	65	86
Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	35	25
Current \| Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	520	507
Current \| Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	26	18
30-59 days past due \| Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	53	60
30-59 days past due \| Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	4	3
60-89 days past due \| Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	36	45
60-89 days past due \| Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	2	2
90+ days past due \| Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	80	87
90+ days past due \| Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	$ 3	$ 2