Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant And Equipment [Abstract]

Property, Plant And Equipment, Net

($ in millions)	Estimated Useful Lives		2019			2018
Land		N/A	$	217		$	230
Buildings and leasehold improvements	40 years			2,171			2,302
General support	5 to 15 years			1,624			1,616
Central office/electronic circuit equipment	5 to 8 years			7,968			8,447
Poles	30 years			1,274			1,211
Cable, fiber and wire	15 to 25 years			11,312			11,743
Conduit	50 years			1,608			1,672
Construction work in progress				378			436
Property, plant and equipment				26,552			27,657
Less: Accumulated depreciation				(13,589	)		(13,470	)
Property, plant and equipment, net			$	12,963		$	14,187

Schedule Of Depreciation Expense

	For the year ended December 31,
($ in millions)	2019		2018		2017
Depreciation expense	$	1,335	$	1,385	$	1,485