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Property and Equipment | 12 Months Ended
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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,
| 2021 |  | 2020
Computer equipment | $ | 1,226 |  |  | $ | 974 |
Computer software | 77 |  |  | 72 |
Leasehold and other improvements | 200 |  |  | 168 |
Furniture and fixtures | 74 |  |  | 69 |
Construction in progress | 14 |  |  | 9 |
Property and equipment, gross | 1,591 |  |  | 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.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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