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Property, Plant, and Equipment
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Premises and Equipment PREMISES AND EQUIPMENT
A summary of premises and equipment by major category follows:
(in millions)  
December 3120232022
Land$81 $81 
Buildings and improvements768 737 
Furniture and equipment536 518 
Total cost1,385 1,336 
Less: Accumulated depreciation and amortization(940)(936)
Net book value$445 $400 
The Corporation conducts a portion of its business from leased facilities and leases certain equipment. Refer to Note 25 for more information on leased facilities and equipment.
Other assets included unamortized capitalized software costs of $106 million and $83 million at December 31, 2023 and 2022, respectively. Noninterest expenses included software amortization expense of $26 million, $25 million and $33 million for the years ending December 31, 2023, 2022 and 2021, respectively.