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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Net property, plant and equipment is composed of the following:
| Depreciable Lives |  | As of December 31,
|  | 2022 |  | 2021
|  |  | (Dollars in millions)
Property, plant and equipment: |  |  |  |  |
Land | N/A |  | $ | 339 |  |  | 335 |
Fiber, conduit and other outside plant(1) | 15-45 years |  | 6,755 |  |  | 6,406 |
Central office and other network electronics(2) | 7-10 years |  | 5,283 |  |  | 5,106 |
Support assets(3) | 3-30 years |  | 2,766 |  |  | 2,721 |
Construction in progress(4) | N/A |  | 747 |  |  | 491 |
Gross property, plant and equipment |  |  | 15,890 |  |  | 15,059 |
Accumulated depreciation |  |  | (7,617) |  |  | (6,879) |
Net property, plant and equipment |  |  | $ | 8,273 |  |  | 8,180 |
_______________________________________________________________________________ (1)Fiber, conduit and other outside plant consists of fiber and metallic cable, conduit, poles and other supporting structures. (2)Central office and other network electronics consists of circuit and packet switches, routers, transmission electronics and electronics providing service to customers. (3)Support assets consist of buildings, computers and other administrative and support equipment. (4)Construction in progress includes inventory held for construction and property of the aforementioned categories that has not been placed in service as it is still under construction. We recorded depreciation expense of $781 million, $833 million and $834 million for the years ended December 31, 2022, 2021 and 2020, 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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://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 https://asc.fasb.org/extlink&oid=126982197&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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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