Finance Receivables and Loans, Net - Schedule of Purchases of Financing Receivables and Loans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total purchases of finance receivables and loans	$ 1,284	$ 809	$ 3,276	$ 2,392
Consumer | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total purchases of finance receivables and loans	1,258	802	3,242	2,377
Consumer | Consumer mortgage finance receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total purchases of finance receivables and loans	0	7	8	15
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total purchases of finance receivables and loans	$ 26	$ 0	$ 26	$ 0