Retrospective Application of Change in Accounting Policy (Tables)

12 Months Ended

Dec. 31, 2016

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Retrospective Application of Change in Accounting Policy

The following tables provide information regarding the impact of these revisions on selected consolidated financial data:

		2016				2015				2014
Year Ended December 31, 2016		As previously reported1		As adjusted		As previously reported1		As adjusted		As previously reported1		As adjusted
(Dollars in millions)
Operating Revenues
	Service	$	3,030	$	3,081	$	3,350		3,384		3,398		3,407
	Total operating revenues		3,939		3,990		3,997		4,031		3,893		3,902
Operating income (loss)			(3)		48		313		347		(143)		(134)
Investment and other income (expenses)
	Interest and dividend income		57		6		36		2		12		3
	Total investment and other income		85		34		91		57		84		75
1	In Annual Report on Form 10-K for the year ended December 31, 2016, filed on February 24, 2017.