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Property and Equipment, Net
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net Property and Equipment, Net
Property and equipment, net was comprised of the following (amounts in millions):
 At December 31,
 20202019
Land$1 $1 
Buildings4 4 
Leasehold improvements246 252 
Computer equipment704 654 
Office furniture and other equipment95 91 
Total cost of property and equipment1,050 1,002 
Less accumulated depreciation(841)(749)
Property and equipment, net$209 $253 

Depreciation expense for the years ended December 31, 2020, 2019, and 2018 was $117 million, $124 million, and $138 million, respectively.