Finance Receivables and Loans, Net - Schedule of Sales of Financing Receivables and Loans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total sales and transfers	$ 70	$ 237	$ 2,391	$ 1,390
Consumer | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total sales and transfers	0	0	0	1,108
Consumer | Consumer mortgage finance receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total sales and transfers	50	117	50	117
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total sales and transfers	0	0	2,248	0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total sales and transfers	$ 20	$ 120	$ 93	$ 165