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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
Schedule of net property, plant and equipment | Net property, plant and equipment is composed of the following:
| Depreciable Lives |  | As of December 31,
|  | 2022(5) |  | 2021(5)
|  |  | (Dollars in millions)
Land | N/A |  | $ | 651 |  |  | 751 |
Fiber, conduit and other outside plant (1) | 15-45 years |  | 14,451 |  |  | 15,366 |
Central office and other network electronics(2) | 3-10 years |  | 15,077 |  |  | 15,394 |
Support assets(3) | 3-30 years |  | 6,863 |  |  | 7,181 |
Construction in progress(4) | N/A |  | 2,010 |  |  | 1,474 |
Gross property, plant and equipment |  |  | 39,052 |  |  | 40,166 |
Accumulated depreciation |  |  | (19,886) |  |  | (19,271) |
Net property, plant and equipment |  |  | $ | 19,166 |  |  | 20,895 |
_______________________________________________________________________________ (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, cable landing stations, data centers, 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. (5)These values exclude assets classified as held for sale.
Schedule of changes to asset retirement obligations | The following table provides asset retirement obligation activity:
| Years Ended December 31,
| 2022 |  | 2021
| (Dollars in millions)
Balance at beginning of year | $ | 182 |  |  | 199 |
Accretion expense | 10 |  |  | 10 |
Liabilities settled | (10) |  |  | (13) |
Change in estimate | 4 |  |  | (2) |
Classified as held for sale(1) | (30) |  |  | (12) |
Balance at end of year | $ | 156 |  |  | 182 |
_______________________________________________________________________________ (1)Represents the amounts classified as held for sale related to our divestitures. See Note 2—Divestitures of the Latin American and ILEC Businesses and Planned Divestiture of the EMEA Business.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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