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Property and Equipment
 3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
 
Property and equipment, net consists of the following (in millions):
 March 31, 2021December 31, 2020
Computer equipment$1,020 $974 
Computer software74 72 
Leasehold and other improvements180 168 
Furniture and fixtures70 69 
Construction in progress6 9 
Property and equipment, gross1,350 1,292 
Less: Accumulated depreciation(657)(632)
Property and equipment, net$693 $660 

Construction in progress consists primarily of leasehold and other improvements and in-process software development costs. Depreciation expense for the three months ended March 31, 2021 and 2020 was $71 million and $51 million, respectively.