Property, Plant and Equpment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property, plant and equipment

TDS’ Property, plant and equipment in service and under construction, and related accumulated depreciation and amortization, as of December 31, 2019 and 2018, were as follows:

December 31,	Useful Lives (Years)	2019			2018
(Dollars in millions)
Land	N/A	$	57		$	55
Buildings	5-40	527			523
Leasehold and land improvements	1-30	1,314			1,245
Cable and wire	15-35	1,996			1,884
Network and switching equipment	3-13	2,507			2,423
Cell site equipment	7-25	3,708			3,460
Office furniture and equipment	3-10	387			378
Other operating assets and equipment	3-12	174			193
System development	1-7	1,604			1,486
Work in process	N/A	590			427
Total property, plant and equipment, gross		12,864			12,074
Accumulated depreciation and amortization		(9,337		)	(8,728		)
Total property, plant and equipment, net		$	3,527		$	3,346