Loans and Related Allowance for Credit Losses, Loan Purchases, Sales, and Transfers (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Loans and Allowance for Credit Losses, Significant Activity [Abstract] | ||||
| Purchases | $ 120 | $ 208 | $ 639 | $ 588 |
| Sales and net transfers (to)/from LHFS | (4,003) | (1,859) | (4,616) | (2,702) |
| Total Commercial [Member] | ||||
| Loans and Allowance for Credit Losses, Significant Activity [Abstract] | ||||
| Purchases | 117 | 207 | 632 | 586 |
| Sales and net transfers (to)/from LHFS | (3,997) | (1,859) | (4,614) | (2,714) |
| Total Consumer [Member] | ||||
| Loans and Allowance for Credit Losses, Significant Activity [Abstract] | ||||
| Purchases | 3 | 1 | 7 | 2 |
| Sales and net transfers (to)/from LHFS | $ (6) | $ 0 | $ (2) | $ 12 |