Debt - Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2025	Jan. 31, 2025	Dec. 31, 2024
Long-term Debt [Abstract]
Premiums on senior notes, net	$ 2		$ 4
Debt issuance costs	(9)		(10)
Total debt, net	5,243		5,680
Less current maturities of long-term debt, net	0		(389)
Total debt, net	5,243		5,291
Fair Value	5,193		5,548
Less current maturities of long-term debt, net	0		(389)
Total long-term debt, net	5,193		5,159
Credit Facility \| Credit Facility
Long-term Debt [Abstract]
Borrowings	0		0
Fair Value	$ 0		0
Senior Notes \| 4.95% senior notes due 2025
Long-term Debt [Abstract]
Interest rate, stated percentage	4.95%	4.95%
Outstanding borrowings	$ 0		389
Fair Value	$ 0		389
Senior Notes \| 5.50% senior notes due 2026
Long-term Debt [Abstract]
Interest rate, stated percentage	5.50%
Outstanding borrowings	$ 0		47
Fair Value	$ 0		47
Senior Notes \| 5.375% senior notes due 2029
Long-term Debt [Abstract]
Interest rate, stated percentage	5.375%
Outstanding borrowings	$ 700		700
Fair Value	$ 697		684
Senior Notes \| 5.875% senior notes due 2029
Long-term Debt [Abstract]
Interest rate, stated percentage	5.875%
Outstanding borrowings	$ 500		500
Fair Value	$ 500		494
Senior Notes \| 6.75% senior notes due 2029
Long-term Debt [Abstract]
Interest rate, stated percentage	6.75%
Outstanding borrowings	$ 950		950
Fair Value	$ 965		959
Senior Notes \| 5.375% senior notes due 2030
Long-term Debt [Abstract]
Interest rate, stated percentage	5.375%
Outstanding borrowings	$ 1,200		1,200
Fair Value	$ 1,192		1,174
Senior Notes \| 4.75% senior notes due 2032
Long-term Debt [Abstract]
Interest rate, stated percentage	4.75%
Outstanding borrowings	$ 1,150		1,150
Fair Value	$ 1,089		1,067
Senior Notes \| 5.70% senior notes due 2035
Long-term Debt [Abstract]
Interest rate, stated percentage	5.70%
Outstanding borrowings	$ 750		750
Fair Value	$ 750		$ 734

Debt Instrument, Current Maturities, Fair Value Disclosure

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- Definition

Debt Instrument, Excluding Current Maturities, Fair Value Disclosure

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No definition available.

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- Definition

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.

+ References

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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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- Definition

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

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Amount, after accumulated amortization, of debt premium.

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- Definition

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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- Definition

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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