v3.26.3
Loan Servicing - Analysis of Activity in Residential MSRs (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Servicing Asset at Fair Value, Amount [Roll Forward]    
MSRs, carrying value, beginning balance $ 3,972  
MSRs, carrying value, ending balance 5,066  
Residential MSRs    
Servicing Asset at Fair Value, Amount [Roll Forward]    
MSRs, carrying value, beginning balance 3,724 $ 3,431
Additions 306 160
Change in fair value due to changes in valuation inputs or assumptions 313 (16)
Realization of expected net servicing cash flows, passage of time, and other (290) (233)
MSRs, carrying value, ending balance 4,808 3,524
Residential MSRs | Servicing rights acquisition    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions $ 755 $ 182