Debt (Table)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Revolving credit facilities

The following table summarizes the revolving credit agreement as of December 31, 2020:

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

The following table summarizes the term loan credit agreement as of December 31, 2020:

(Dollars in millions)
Maximum borrowing capacity	$	300
Amount borrowed	$	83
Amount available for use	$	217

Long-term debt

Long-term debt as of December 31, 2020 and 2019, was as follows:

				December 31, 2020						December 31, 2019
	Issuance date	Maturity date	Call date (any time on or after)	Principal Amount		Less Unamortized discounts 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	$	13	$	531	$	544	$	13	$	531
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
6.250%	Aug 2020	Sep 2069	Sep 2025	500		17		483		—		—		—
5.500%	Dec 2020	Mar 2070	Mar 2026	500		17		483		—		—		—
Term Loan				83		3		80		83		1		82
EIP Securitization				25		—		25		—		—		—
Finance lease obligations				3		—		3		4		—		4
Installment payment agreement				—		—		—		7		—		7
Total long-term debt				$	2,572	$	81	$	2,491	$	1,555	$	45	$	1,510
Long-term debt, current								$	2					$	8
Long-term debt, noncurrent								$	2,489					$	1,502