Loan Servicing - Analysis of Activity in Residential MSRs (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Servicing Asset at Fair Value, Amount [Roll Forward]
MSRs, carrying value, beginning balance	$ 3,708
MSRs, carrying value, ending balance	3,612
Residential MSRs
Servicing Asset at Fair Value, Amount [Roll Forward]
MSRs, carrying value, beginning balance	3,430	$ 3,088
Additions	102	78
Sales	0	(2)
Change in fair value due to changes in valuation inputs or assumptions	(31)	88
Realization of expected net servicing cash flows, passage of time, and other	(151)	(135)
MSRs, carrying value, ending balance	$ 3,350	$ 3,117