Loans and Related Allowance for Credit Losses, Loan Purchases, Sales, and Transfers (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Loans and Allowance for Credit Losses, Significant Activity [Abstract] | ||
| Purchases | $ 1,655 | $ 843 |
| Sales and net transfers (to)/from LHFS | (4,638) | (2,856) |
| Total Commercial [Member] | ||
| Loans and Allowance for Credit Losses, Significant Activity [Abstract] | ||
| Purchases | 1,648 | 839 |
| Sales and net transfers (to)/from LHFS | (4,483) | (2,662) |
| Total Consumer [Member] | ||
| Loans and Allowance for Credit Losses, Significant Activity [Abstract] | ||
| Purchases | 7 | 4 |
| Sales and net transfers (to)/from LHFS | $ (155) | $ (194) |