Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Long-term Debt [Abstract]
Discounts on senior notes, net	$ (9)	$ (8)
Debt issuance costs	(8)	(8)
Total debt, net	5,008	5,009
Less current maturities of long-term debt, net	(875)	0
Long-term debt, net	4,133	5,009
Fair Value	5,022	5,063
Less current maturities of long-term debt, net	(848)	0
Total long-term debt, net	4,174	5,063
Credit Facility \| Credit Facility
Long-term Debt [Abstract]
Credit Facility	0	0
Fair Value	0	0
Senior Notes \| 5.375% senior notes due 2029
Long-term Debt [Abstract]
Outstanding borrowings	638	638
Fair Value	$ 638	639
Interest rate, stated percentage	5.375%
Senior Notes \| 5.875% senior notes due 2029
Long-term Debt [Abstract]
Outstanding borrowings	$ 440	440
Fair Value	$ 441	441
Interest rate, stated percentage	5.875%
Senior Notes \| 6.75% senior notes due 2029
Long-term Debt [Abstract]
Outstanding borrowings	$ 847	847
Fair Value	$ 848	852
Interest rate, stated percentage	6.75%
Senior Notes \| 5.375% senior notes due 2030
Long-term Debt [Abstract]
Outstanding borrowings	$ 1,200	1,200
Fair Value	$ 1,211	1,218
Interest rate, stated percentage	5.375%
Senior Notes \| 4.75% senior notes due 2032
Long-term Debt [Abstract]
Outstanding borrowings	$ 1,150	1,150
Fair Value	$ 1,123	1,137
Interest rate, stated percentage	4.75%
Senior Notes \| 5.70% senior notes due 2035
Long-term Debt [Abstract]
Outstanding borrowings	$ 750	750
Fair Value	$ 761	$ 776
Interest rate, stated percentage	5.70%

Debt Instrument, Current Maturities, Fair Value Disclosure

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Debt Instrument, Excluding Current Maturities, Fair Value Disclosure

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

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Amount, after accumulated amortization, of debt discount (premium).

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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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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