Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2024

Property, Plant and Equipment [Abstract]

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	$	191	202
Fiber conduit and other outside plant (1)	15-45 years	4,563		4,380
Central office and other network electronics (2)	7-10 years	3,752		3,467
Support assets (3)	3-30 years	2,278		2,252
Construction-in-progress (4)	N/A	909		762
Gross property, plant and equipment		11,693		11,063
Accumulated depreciation		(4,139)		(3,665)
Net property, plant and equipment		$	7,554	7,398

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(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 construction and property of the aforementioned categories that has not been placed in service as it is still under construction.

Schedule of change in asset retirement obligation

The following table provides asset retirement obligation activity:

	Years Ended December 31,
	2024		2023
	(Dollars in millions)
Balance at beginning of period	$	94	85
Accretion expense	6		4
Liabilities settled	(10)		(6)
Change in estimate	7		11
Balance at end of period	$	97	94