Sales of Receivables and Servicing Rights - Activity Related to the MSR Portfolio (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Transfers and Servicing [Abstract]
Securities losses, net – non-qualifying hedges on mortgage servicing rights	$ 0	$ (1)	$ 0	$ (2)
Changes in fair value and settlement of free-standing derivatives purchased to economically hedge the MSR portfolio	(75)	(84)	(110)	(368)
MSR fair value adjustments due to changes in inputs or assumptions	$ 73	$ 83	$ 107	$ 358