Property, Plant and Equipment

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Note 9 Property, Plant and Equipment

Property, plant and equipment in service and under construction, and related accumulated depreciation and amortization, as of December 31, 2022 and 2021, were as follows:

December 31,	Useful Lives (Years)	2022		2021
(Dollars in millions)
Land	N/A	$	37	$	37
Buildings	20	281		293
Leasehold and land improvements	1-30	1,504		1,442
Cell site equipment	7-25	4,247		4,150
Switching equipment	5-8	1,115		1,095
Office furniture and equipment	3-5	209		252
Other operating assets and equipment	3-5	47		47
System development	1-7	1,676		1,479
Work in process	N/A	218		261
Total property, plant and equipment, gross		9,334		9,056
Accumulated depreciation and amortization		(6,710)		(6,450)
Total property, plant and equipment, net		$	2,624	$	2,606

Depreciation and amortization expense totaled $682 million, $662 million and $669 million in 2022, 2021 and 2020, respectively. In 2022, 2021 and 2020, (Gain) loss on asset disposals, net included charges of $19 million, $23 million and $25 million, respectively, related to disposals of assets from service in the normal course of business.