Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Summary of Plant, Property and Equipment

The following table displays the details of Property, plant and equipment, which is stated at cost:

		(dollars in millions)
At December 31,	Lives (years)	2017		2016
Land	—	$	806	$	667
Buildings and equipment	7-45	28,914		27,117
Central office and other network equipment	3-50	145,093		136,737
Cable, poles and conduit	7-50	47,972		45,639
Leasehold improvements	5-20	8,394		7,627
Work in progress	—	6,139		5,710
Furniture, vehicles and other	3-20	9,180		8,718
		246,498		232,215
Less accumulated depreciation		157,930		147,464
Property, plant and equipment, net		$	88,568	$	84,751