Sales of Receivables and Servicing Rights - Changes in the Servicing Assets (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 1,704	$ 1,737
Servicing rights originated	36	36
Servicing rights sold	0	(5)
Changes in fair value:
Due to changes in inputs or assumptions	(24)	1
Other changes in fair value	(115)	(113)
Balance, end of period	$ 1,601	$ 1,656