Finance Receivables - Schedule of Modified Financing Receivables Days Delinquent (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	$ 699	$ 776
Finance receivables subsequently charged off	80	49
Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	21	12
Finance receivables subsequently charged off	0	0
Current \| Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	527	576
Current \| Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	16	8
30-59 days past due \| Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	57	61
30-59 days past due \| Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	3	2
60-89 days past due \| Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	40	46
60-89 days past due \| Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	1	1
90+ days past due \| Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	75	93
90+ days past due \| Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	$ 1	$ 1