Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant And Equipment [Abstract]

Property, Plant And Equipment, Net

($ in millions)	Estimated Useful Lives	2016		2015
Land	N/A	$	235	$	151
Buildings and leasehold improvements	41 years		2,300		1,327
General support	5 to 17 years		1,495		1,146
Central office/electronic circuit equipment	5 to 18 years		7,683		6,244
Poles	30 years		995		712
Cable, fiber and wire	15 to 25 years		10,267		7,280
Conduit	55 years		1,611		515
Other	12 to 25 years		52		47
Construction work in progress			903		379
Property, plant and equipment			25,541		17,801
Less: Accumulated depreciation			(10,639)		(9,308)
Property, plant and equipment, net		$	14,902	$	8,493

Schedule of Depreciation Expense

	For the Year Ended
($ in millions)	2016		2015		2014
Depreciation expense	$	1,388	$	983	$	835