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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Schedule of Property, Plant and Equipment | Useful lives for premises and equipment are estimated as follows:
Premises and Equipment |  | Useful Lives
Buildings and improvements |  | 5-39 years
Furniture and equipment |  | 3-10 years
Computer software |  | 3 years
Leasehold improvements |  | Lesser of the useful life or the remaining lease term
The following table presents our premises and equipment as of December 31, 2019 and 2018. Table 7.1 Components of Premises and Equipment
(Dollars in millions) |  | December 31, 2019 |  | December 31, 2018
Land |  | $ | 382 |  |  | $ | 386 |
Buildings and improvements |  | 3,903 |  |  | 3,994 |
Furniture and equipment |  | 2,218 |  |  | 2,018 |
Computer software |  | 1,996 |  |  | 1,847 |
In progress |  | 689 |  |  | 482 |
Total premises and equipment, gross |  | 9,188 |  |  | 8,727 |
Less: Accumulated depreciation and amortization |  | (4,810 | ) |  | (4,536 | )
Total premises and equipment, net |  | $ | 4,378 |  |  | $ | 4,191 |

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