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Long-Term Debt And Lease Obligation (Tables)

12 Months Ended

Dec. 31, 2024

Long-Term Debt and Lease Obligation [Abstract]

Schedule 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,
																		2024						2023						2024						2023
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						372						372						374						374
												Total						$	790					$	790					$	793					$	793

Lease Obligations Over Next Five Years and Thereafter

interest for finance and operating leases:

(Dollars in millions)			Years ended December 31,
			2025						2026						2027						2028						2029						2030 and thereafter
Finance lease obligations			$	16					$	13					$	10					$	9					$	6					$	3
Operating lease obligations			3						3						2						1						1						—
Total lease obligations			$	19					$	16					$	12					$	10					$	7					$	3

Other Operating and Finance Lease Disclosure

The following table provides lease cost and other information:

(Dollars in millions)						Years ended December 31,
						2024						2023						2022
Lease cost:
Finance lease cost						$	16					$	14					$	14
Operating lease cost						3						3						5
Total lease cost						$	19					$	17					$	19
Other information finance leases:
Finance cash outflows						$	17					$	16					$	15
Weighted average discount rate						4.88		%				4.35		%				3.20		%
Weighted average remaining lease term in years						3.96						3.89						3.49
Other information operating leases:
Operating cash outflows						$	3					$	3					$	4
Weighted average discount rate						4.44		%				4.66		%				3.44		%
Weighted average remaining lease term in years						3.47						4.30						4.53

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Lease Obligations Over Next Five Years and Thereafter contains lease obligation expected to be paid over next five years and thereafter and includes finance and operating leases.

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Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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