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Property and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment, net consists of the following (in millions):
 December 31,
 20212020
Computer equipment$1,226 $974 
Computer software77 72 
Leasehold and other improvements200 168 
Furniture and fixtures74 69 
Construction in progress14 9 
Property and equipment, gross1,591 1,292 
Less: Accumulated depreciation(825)(632)
Property and equipment, net$766 $660 

Construction in progress consists primarily of leasehold and other improvements and in-process software development costs. Depreciation expense was $312 million, $225 million and $168 million for the years ended December 31, 2021, 2020 and 2019, respectively.