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Property and Equipment, Net
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net
6. Property and Equipment, Net

Property and equipment, net was comprised of the following (amounts in millions):

 At December 31,
 20212020
Land$1 $1 
Buildings4 4 
Leasehold improvements227 246 
Computer equipment703 704 
Office furniture and other equipment90 95 
Total cost of property and equipment1,025 1,050 
Less accumulated depreciation(856)(841)
Property and equipment, net$169 $209 

Depreciation expense for the years ended December 31, 2021, 2020, and 2019 was $105 million, $117 million, and $124 million, respectively.