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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
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, 2020 and 2019, were as follows:
December 31,Useful Lives (Years)20202019
(Dollars in millions)   
LandN/A$56 $57 
Buildings5-40533 527 
Leasehold and land improvements1-301,404 1,314 
Cable and wire15-402,195 1,996 
Network and switching equipment3-102,634 2,507 
Cell site equipment7-254,017 3,708 
Office furniture and equipment3-10394 387 
Other operating assets and equipment1-12189 174 
System development1-71,709 1,604 
Work in processN/A528 590 
Total property, plant and equipment, gross 13,659 12,864 
Accumulated depreciation and amortization (9,687)(9,337)
Total property, plant and equipment, net $3,972 $3,527