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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2024
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Note 9—Property, Plant and Equipment Net property, plant and equipment is composed of the following:
| Depreciable Lives |  | As of December 31,
|  | 2024 |  | 2023
|  |  | (Dollars in millions)
Land | N/A |  | $ | 630 |  |  | 646 |
Fiber, conduit and other outside plant (1) | 15-45 years |  | 17,348 |  |  | 15,217 |
Central office and other network electronics(2) | 3-10 years |  | 16,616 |  |  | 15,741 |
Support assets(3) | 3-30 years |  | 6,804 |  |  | 6,714 |
Construction in progress(4) | N/A |  | 2,144 |  |  | 2,758 |
Gross property, plant and equipment |  |  | 43,542 |  |  | 41,076 |
Accumulated depreciation |  |  | (23,121) |  |  | (21,318) |
Net property, plant and equipment |  |  | $ | 20,421 |  |  | 19,758 |
_______________________________________________________________________________ (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, 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. During 2024, we initiated marketing of our Broomfield, Colorado office buildings to locate a buyer and have classified those buildings as held for sale, resulting in an impairment loss of $80 million. During the second quarter of 2023, we donated our Monroe, Louisiana campus and leased back a portion thereof. This donation resulted in a $101 million loss recognized for the year ended December 31, 2023. We recorded depreciation expense of $1.9 billion, $1.9 billion and $2.1 billion for the years ended December 31, 2024, 2023 and 2022, respectively. Asset Retirement Obligations As of December 31, 2024 and 2023, our asset retirement obligations balance was primarily related to estimated future costs of removing equipment from leased properties and estimated future costs of properly disposing of asbestos and other hazardous materials upon remodeling or demolishing buildings. Asset retirement obligations are included in other long-term liabilities on our consolidated balance sheets. Our fair value estimates were determined using the discounted cash flow method. The following table provides asset retirement obligation activity:
| Years Ended December 31,
| 2024 |  | 2023
| (Dollars in millions)
Balance at beginning of period | $ | 157 |  |  | 156 |
Accretion expense | 12 |  |  | 6 |
Liabilities settled | (12) |  |  | (9) |
Change in estimate | — |  |  | 4 |
Balance at end of period | $ | 157 |  |  | 157 |
The changes in estimate referred to in the table above were offset against gross property, plant and equipment.

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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://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
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