Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2017

Summary Of Significant Accounting Policies [Abstract]

Schedule Of Revenues From External Customers

	For the three months ended				For the six months ended
	June 30,				June 30,
($ in millions)	2017		2016		2017		2016
Data and Internet services	$	974	$	1,048	$	1,967	$	1,635
Voice services		724		836		1,475		1,303
Video services		329		419		676		487
Other		79		78		147		145
Customer revenue		2,106		2,381		4,265		3,570
Switched access and subsidy		198		227		395		393
Total revenue	$	2,304	$	2,608	$	4,660	$	3,963