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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 The major classes of property and equipment are summarized in the table below.
| Estimated Useful Lives |  | As of December 31,
|  | 2021 |  | 2020
Land(a) | — |  | $ | 2,259 |  |  | $ | 2,171 |
Buildings | 40 years |  | 218 |  |  | 147 |
Communications infrastructure assets | 1-20 years |  | 23,289 |  |  | 22,027 |
Information technology assets and other | 2-7 years |  | 587 |  |  | 557 |
Construction in process | — |  | 853 |  |  | 1,063 |
Total gross property and equipment |  |  | 27,206 |  |  | 25,965 |
Less: accumulated depreciation |  |  | (11,937) |  |  | (10,803) |
Total property and equipment, net |  |  | $ | 15,269 |  |  | $ | 15,162 |
(a)Includes land owned through fee interests and perpetual easements. Depreciation expense for the years ended December 31, 2021, 2020 and 2019 was $1.2 billion, $1.2 billion and $1.1 billion, respectively. See note 13 for a discussion of finance leases recorded as "Property and equipment, net" on the Company's consolidated balance sheet.

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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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