Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

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,
		2021		2020
		(Dollars in millions)
Land	N/A	$	751	848
Fiber, conduit and other outside plant(1)	15-45 years	15,366		26,522
Central office and other network electronics(2)	3-10 years	15,394		20,692
Support assets(3)	3-30 years	7,181		8,261
Construction in progress(4)	N/A	1,474		1,611
Gross property, plant and equipment		40,166		57,934
Accumulated depreciation		(19,271)		(31,596)
Net property, plant and equipment		$	20,895	26,338

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(1)Fiber, conduit and other outside plant consists of fiber and metallic cable, conduit, poles and other supporting structures. Fiber, conduit and other outside plant decreased as of December 31, 2021 compared to December 31, 2020 due to the retirement of a portion of our copper-based infrastructure being replaced with our Quantum Fiber infrastructure.

(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.

Schedule of changes to asset retirement obligations

The following table provides asset retirement obligation activity:

	Years Ended December 31,
	2021		2020	2019
	(Dollars in millions)
Balance at beginning of year	$	199	197	190
Accretion expense	10		10	11
Liabilities settled	(13)		(8)	(14)
Change in estimate	(2)		—	10
Reclassified as held for sale(1)	(12)		—	—
Balance at end of year	$	182	199	197

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(1)Represents the amounts reclassified as held for sale related to our planned divestitures. See Note 2—Planned Divestiture of the Latin American and ILEC Businesses.