Debt (Table)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Debt instrument facilities

The following table summarizes the revolving credit facility as of December 31, 2016:

(Dollars in millions)
Maximum borrowing capacity	$	300
Letters of credit outstanding	$	2
Amount borrowed	$	–
Amount available for use	$	298

Long-term debt

Long-term debt as of December 31, 2016 and 2015 was as follows:

								December 31,
								2016						2015
				Issuance date	Maturity date	Call date (any time on or after)		Principal Amount		Less Unamortized discount and debt issuance costs		Total		Principal Amount		Less Unamortized discount and debt issuance costs	Total
(Dollars in millions)
	Unsecured Senior Notes
			6.700%	Dec 2003 and June 2004	Dec 2033	Dec 2003 and June 2004	$	544	$	15	$	529	$	544	$	15	$	529
			6.950%	May 2011	May 2060	May 2016		342		11		331		342		11		331
			7.250%	Dec 2014	Dec 2063	Dec 2019		275		10		265		275		10		265
			7.250%	Nov 2015	Dec 2064	Dec 2020		300		10		290		300		10		290
		Term Loan		Jul 2015	Jan 2022			214		2		212		225		2		223
	Obligation on capital leases							2		–		2		2		–		2
Total long-term debt							$	1,677	$	48	$	1,629	$	1,688	$	48	$	1,640
	Long-term debt, current										$	11					$	11
	Long-term debt, noncurrent										$	1,618					$	1,629