Finance Receivables - Schedule of Net Finance Receivables by Type (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	$ 24,763	$ 24,449
Unearned fees	(300)	(300)
Accrued finance charges and fees	392	410
Deferred origination costs	290	274
Total	25,145	24,833
Total Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	23,635	23,524
Unearned fees	(300)	(300)
Accrued finance charges and fees	392	410
Deferred origination costs	274	263
Total	24,001	23,897
Personal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	21,002	21,086
Unearned fees	(260)	(258)
Accrued finance charges and fees	363	382
Deferred origination costs	224	220
Total	21,329	21,430
Auto Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	2,633	2,438
Unearned fees	(40)	(42)
Accrued finance charges and fees	29	28
Deferred origination costs	50	43
Total	2,672	2,467
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	1,128	925
Unearned fees	0	0
Accrued finance charges and fees	0	0
Deferred origination costs	16	11
Total	$ 1,144	$ 936