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Property, Plant and Equpment (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 and 2016, were as follows:

 

Useful Lives

 

 

 

 

 

 

December 31,

(Years)

 

2017

 

2016

(Dollars in millions)

 

 

 

 

 

 

 

Land

N/A

 

$

55 

 

$

54 

Buildings

5-40

 

 

519 

 

 

511 

Leasehold and land improvements

1-30

 

 

1,214 

 

 

1,188 

Cable and wire

15-35

 

 

1,802 

 

 

1,740 

Network and switching equipment

3-13

 

 

2,361 

 

 

2,348 

Cell site equipment

7-25

 

 

3,411 

 

 

3,383 

Office furniture and equipment

3-10

 

 

480 

 

 

508 

Other operating assets and equipment

3-12

 

 

194 

 

 

187 

System development

1-7

 

 

1,387 

 

 

1,523 

Work in process

N/A

 

 

319 

 

 

237 

Total property, plant and equipment, gross

 

 

 

11,742 

 

 

11,679 

Accumulated depreciation and amortization

 

 

 

(8,318)

 

 

(8,124)

Total property, plant and equipment, net

 

 

$

3,424 

 

$

3,555