Debt - Schedule of Carrying Values of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2026	Feb. 20, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Debt instrument, face amount	$ 501		$ 408
Total debt and obligations under finance leases, principal balance	495		404
Short-term debt and current maturities of long-term debt	36		17
Total long-term debt and obligations under finance leases - principal balance	465		391
Long-term debt and obligations under finance leases	459		387
Unamortized discount (premium) and debt issuance costs, net			4
Revolver
Debt Instrument [Line Items]
Debt instrument, face amount	0		35
Total debt and obligations under finance leases, principal balance	0		35
ABL Facility
Debt Instrument [Line Items]
Debt instrument, face amount	65		0
Total debt and obligations under finance leases, principal balance	65		0
7.50% Notes due 2027
Debt Instrument [Line Items]
Debt instrument, face amount	0		355
Total debt and obligations under finance leases, principal balance	$ 0		351
7.50% Notes due 2027 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.50%
6.375% Notes due 2031
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400		0
Total debt and obligations under finance leases, principal balance	$ 394		0
6.375% Notes due 2031 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 400
Debt instrument, interest rate, stated percentage	6.375%
Unamortized debt issuance expense	$ 6
Finance leases, asset financing and other
Debt Instrument [Line Items]
Debt instrument, face amount	36		18
Total debt and obligations under finance leases, principal balance	$ 36		$ 18

Debt Instrument, Face Amount, Non-current

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- Definition

Amount of short-term and long-term debt and lease obligation.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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