Premises and Equipment (Schedule of Premises and Equipment) (Details) - USD ($) $ in Millions |
Dec. 31, 2023 |
Dec. 31, 2022 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Premises and equipment, gross | $ 4,700 | $ 4,681 |
| Accumulated depreciation and amortization | (3,058) | (2,963) |
| Premises and equipment, net | 1,642 | 1,718 |
| Land | ||
| Property, Plant and Equipment [Line Items] | ||
| Premises and equipment, gross | 409 | 420 |
| Premises and improvements | ||
| Property, Plant and Equipment [Line Items] | ||
| Premises and equipment, gross | 1,555 | 1,680 |
| Furniture and equipment | ||
| Property, Plant and Equipment [Line Items] | ||
| Premises and equipment, gross | 1,103 | 1,056 |
| Software | ||
| Property, Plant and Equipment [Line Items] | ||
| Premises and equipment, gross | 1,034 | 969 |
| Leasehold improvements | ||
| Property, Plant and Equipment [Line Items] | ||
| Premises and equipment, gross | 449 | 455 |
| Construction in progress | ||
| Property, Plant and Equipment [Line Items] | ||
| Premises and equipment, gross | $ 150 | $ 101 |