Loan Servicing - Analysis of Activity in Residential MSRs (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Servicing Asset at Fair Value, Amount [Roll Forward]
MSRs, carrying value, beginning balance	$ 3,758
MSRs, carrying value, ending balance	3,497
Residential MSRs
Servicing Asset at Fair Value, Amount [Roll Forward]
MSRs, carrying value, beginning balance	3,428	$ 2,305
Additions	129	257
Sales	(429)	0
Change in fair value due to changes in valuation inputs or assumptions(1)	64	606
Realization of expected net servicing cash flows, passage of time, and other	(133)	(215)
MSRs, carrying value, ending balance	3,182	3,148
Residential MSRs | Servicing rights acquisition
Servicing Asset at Fair Value, Amount [Roll Forward]
Additions	$ 123	$ 195