Recent Accounting Pronouncements (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Standards Update 2014-09 [Member]

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Schedule Of Impact Of Adoption

	For the year ended December 31, 2018
					Amounts without
			Adjustments		Adoption of
($ in millions)	As Reported		for ASC 606		ASC 606
Revenue	$	8,611	$	(15)	$	8,596
Operating expenses		7,784		15		7,799
Operating income	$	827	$	(30)	$	797

Accounting Standards Update 2017-07 [Member]

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Schedule Of Impact Of Adoption

	For the year ended December 31,
	2017						2016
			Impact of						Impact of
			Adoption of						Adoption of
($ in millions)	As Reported		ASU 2017-07		As Restated		As Reported		ASU 2017-07		As Restated
Operating expenses:
Network related expenses	$	1,959	$	(1)	$	1,958	$	1,887	$	(11)	$	1,876
Selling, general and administrative expenses	$	2,018	$	(1)	$	2,017	$	2,093	$	(12)	$	2,081
Pension settlement costs	$	83	$	(83)	$	-	$	-	$	-	$	-
Non-operating income/expenses:
Investment and other income, net	$	3	$	(2)	$	1	$	27	$	(23)	$	4
Pension settlement costs	$	-	$	83	$	83	$	-	$	-	$	-