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Bank Premises and Equipment (Tables)
 6 Months Ended
Jun. 30, 2020
Property, Plant and Equipment [Abstract]  
Summary of Bank Premises and Equipment
The following table provides a summary of bank premises and equipment as of:
($ in millions)June 30,
2020		December 31,
2019
Land and improvements(a)
$616  639  
Buildings(a)
1,573  1,575  
Equipment2,235  2,126  
Leasehold improvements446  432  
Construction in progress(a)
93  85  
Bank premises and equipment held for sale:
Land and improvements28  8  
Buildings24  18  
Equipment1  1  
Accumulated depreciation and amortization(2,963) (2,889) 
Total bank premises and equipment$2,053  1,995  
(a)At June 30, 2020 and December 31, 2019, land and improvements, buildings and construction in progress included $56 and $51, respectively, associated with parcels of undeveloped land intended for future branch expansion.