Description Of Business And Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Description Of Business And Summary Of Significant Accounting Policies [Abstract]

Schedule Of Revenue From External Customers

	For the year ended
	December 31,
($ in millions)	2015		2014		2013
Voice services	$	2,022	$	1,951	$	2,045
Data and Internet services		2,337		1,948		1,866
Other		540		354		299
Customer revenue		4,899		4,253		4,210
Switched access and subsidy		677		519		552
Total revenue	$	5,576	$	4,772	$	4,762