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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
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