Finance Receivables - Schedule of Net Finance Receivables by Type (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	$ 25,863	$ 24,449
Unearned fees	(314)	(300)
Accrued finance charges and fees	410	410
Deferred origination costs	314	274
Total	26,273	24,833
Total Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	24,500	23,524
Unearned fees	(314)	(300)
Accrued finance charges and fees	410	410
Deferred origination costs	294	263
Total	24,890	23,897
Personal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	21,735	21,086
Unearned fees	(275)	(258)
Accrued finance charges and fees	379	382
Deferred origination costs	240	220
Total	22,079	21,430
Auto Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	2,765	2,438
Unearned fees	(39)	(42)
Accrued finance charges and fees	31	28
Deferred origination costs	54	43
Total	2,811	2,467
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	1,363	925
Unearned fees	0	0
Accrued finance charges and fees	0	0
Deferred origination costs	20	11
Total	$ 1,383	$ 936