Long-Term Debt And Lease Obligation (Tables)

12 Months Ended

Dec. 31, 2021

Long-term Debt and Lease Obligation [Abstract]

Book Value And Principal Amounts Of Long-Term Debt

This table summarizes the principal amounts of our long-term debt excluding unamortized discounts, none of which are encumbered by rating triggers:

(Dollars in millions)			Book value				Principal amount
Interest rate	Year of  issue		At December 31,				At December 31,
			2021		2020		2021		2020
6.900%	1998	Senior debentures, due 2028	$	27	$	27	$	28	$	28
6.920%	2005	Senior debentures, due 2028	391		391		391		391
6.125%	2004	Senior notes, due 2034	371		370		374		374
		Total	$	789	$	788	$	793	$	793

Lease Obligations Over Next Five Years and Thereafter

interest for finance and operating leases:

(Dollars in millions)	Years ended December 31,
	2022		2023		2024		2025		2026		2027 and thereafter
Finance lease obligations	$	14	$	12	$	8	$	6	$	3	$	2
Operating lease obligations	4		2		2		2		1		1
Total lease obligations	$	18	$	14	$	10	$	8	$	4	$	3

Other Operating and Finance Lease Disclosure [Table Text Block]

The following table provides lease cost and other information:

(Dollars in millions)	Years ended December 31,
	2021			2020			2019
Lease cost:
Finance lease cost	$	15		$	15		$	9
Operating lease cost	4			4			4
Total lease cost	$	19		$	19		$	13
Other information finance leases:
Finance cash outflows	$	15		$	15		$	15
Weighted average discount rate	2.46		%	2.62		%	2.96		%
Weighted average remaining lease term in years	3.45			3.67			3.65
Other information operating leases:
Operating cash outflows	$	4		$	8		$	8
Weighted average discount rate	2.86		%	3.65		%	3.69		%
Weighted average remaining lease term in years	4.37			4.84			4.71