Mortgage Banking Activities, Serviced for Others Portfolio (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Residential mortgage servicing rights [Member] | ||
| Servicing Asset at Amortized Cost [Line Items] | ||
| Loans serviced for others, unpaid principal balance | $ 362,000 | $ 397,000 |
| Weighted average loan rate | 3.78% | 3.78% |
| Servicer advances, net of an allowance for uncollectible amounts | $ 243 | $ 437 |
| Commercial mortgage servicing [Member] | ||
| Servicing Asset at Amortized Cost [Line Items] | ||
| Loans serviced for others, unpaid principal balance | $ 77,000 | $ 77,000 |
| Weighted average loan rate | 4.12% | 4.11% |
| Servicer advances, net of an allowance for uncollectible amounts | $ 24 | $ 24 |