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 | $ 3,102 | $ 2,860 |
| Premises and equipment, net | 1,091 | 1,003 |
| Land [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Premises and equipment, gross | 37 | 37 |
| Buildings and Improvements [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Premises and equipment, gross | 605 | 587 |
| Furniture, Fixtures and Equipment [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Premises and equipment, gross | 1,155 | 1,111 |
| Software [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Premises and equipment, gross | 1,305 | 1,125 |
| Less: accumulated depreciation and accumulated amortization of software | (602) | (518) |
| Premises and Equipment Excluding Software [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Less: accumulated depreciation and accumulated amortization of software | $ (1,409) | $ (1,339) |