Long-Term Debt and Note Payable - Affiliate (Tables)

12 Months Ended

Dec. 31, 2025

Debt Disclosure [Abstract]

Schedule of long-term debt, including unamortized discounts and premiums

The following table reflects our consolidated long-term debt as of the dates indicated below, including unamortized discounts and premiums and unamortized debt issuance costs:

			December 31,
	Interest Rates (1)	Maturities (1)	2025		2024
			(Dollars in millions)
Senior notes	6.500% - 7.750%	2030 - 2057	$	1,736	1,973
Finance lease and other	Various	Various	2		3
Unamortized premiums, net			—		1
Unamortized debt issuance costs			(50)		(50)
Total long-term debt			1,688		1,927
Less current maturities			—		(239)
Long-term debt, excluding current maturities			$	1,688	1,688

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(1) As of December 31, 2025.

Schedule of aggregate maturities of the entity's long-term debt (excluding unamortized premiums, discounts, and other)

Set forth below is the aggregate principal amount of our long-term debt as of December 31, 2025 (excluding unamortized premiums, net, unamortized debt issuance costs) maturing during the following years:

	(Dollars in millions)
2026	$	—
2027	1
2028	—
2029	—
2030	98
2030 and thereafter	1,639
Total long-term debt	$	1,738

Schedule of amount of gross interest expense, net of capitalized interest and interest expense (income)-affiliates

Interest expense includes interest on total long-term debt. The following table presents the amount of gross interest expense, net of capitalized interest and interest expense-affiliates, net:

	Years Ended December 31,
	2025		2024	2023
	(Dollars in millions)
Interest expense:
Gross interest expense	$	126	137	149
Capitalized interest	(35)		(75)	(54)
Total interest expense	$	91	62	95
Interest income-affiliates, net	$	(89)	(24)	(15)