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Property, Plant and Equpment (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017, were as follows:
December 31,
Useful Lives (Years)
 
2018
 
2017
(Dollars in millions)
 
 
 

 
 

Land
N/A
 
$
55

 
$
55

Buildings
5-40
 
523

 
519

Leasehold and land improvements
1-30
 
1,245

 
1,214

Cable and wire
15-35
 
1,884

 
1,802

Network and switching equipment
3-13
 
2,423

 
2,361

Cell site equipment
7-25
 
3,460

 
3,411

Office furniture and equipment
3-10
 
378

 
480

Other operating assets and equipment
3-12
 
193

 
194

System development
1-7
 
1,486

 
1,387

Work in process
N/A
 
427

 
319

Total property, plant and equipment, gross
 
 
12,074

 
11,742

Accumulated depreciation and amortization
 
 
(8,728
)
 
(8,318
)
Total property, plant and equipment, net
 
 
$
3,346

 
$
3,424