Finance Receivables - Schedule of Modified Financing Receivables Days Delinquent (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	$ 668	$ 699
Finance receivables subsequently charged off	68	80
Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	30	21
Current \| Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	518	527
Current \| Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	23	16
30-59 days past due \| Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	49	57
30-59 days past due \| Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	3	3
60-89 days past due \| Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	33	40
60-89 days past due \| Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	2	1
90+ days past due \| Personal Loans
Financing Receivable, Modified [Line Items]
Modified financing receivables	68	75
90+ days past due \| Auto Finance
Financing Receivable, Modified [Line Items]
Modified financing receivables	$ 2	$ 1