Loan Servicing - Analysis of Activity in Residential MSRs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Servicing Asset at Fair Value, Amount [Roll Forward]
MSRs, carrying value, beginning balance	$ 3,758
MSRs, carrying value, ending balance	3,303
Residential MSRs
Servicing Asset at Fair Value, Amount [Roll Forward]
MSRs, carrying value, beginning balance	3,428	$ 2,305
Additions	44	147
Sales	(428)	0
Change in fair value due to changes in valuation inputs or assumptions(1)	(1)	350
Realization of expected net servicing cash flows, passage of time, and other	(57)	(110)
MSRs, carrying value, ending balance	$ 2,986	$ 2,692