Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2024

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,
		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

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

Schedule of changes to asset retirement obligations

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