Loan Servicing - Residential Mortgage Servicing Activities (Details) - Residential mortgage - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] | ||
| UPB of residential mortgage loan servicing portfolio | $ 325,810 | $ 285,966 |
| UPB of residential mortgage loans serviced for others, primarily agency-conforming fixed-rate | $ 267,522 | $ 228,383 |