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Derivatives, Hedges and Financial Instruments | 12 Months Ended
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Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivatives, Hedges and Financial Instruments | 8. Derivatives, Hedges and Financial Instruments Natural Gas Contracts Periodically, we enter into certain forward natural gas contracts or volume purchase commitments which are within the scope of derivative accounting. None of our natural gas contracts throughout 2024, 2023 and 2022 were accounted for as derivatives as we elected the normal purchase and normal sales scope exception on those contracts. Please see our discussion in Note 1 – Summary of Significant Accounting Policies regarding derivatives. From time to time, when the Company exceeds the funding threshold in our natural gas purchase commitments, the Company is required to fund cash collateral to our counterparty. As of December 31, 2024, we had no counterparty cash collateral funding requirements. Financial Instruments As of December 31, 2024 and 2023, we did no t have any financial instruments with fair values materially different from their carrying amounts (which excludes issuance costs, if applicable) except for our Senior Secured Notes. The fair value of our Senior Secured Notes is classified as a Level 2 fair value measurement while the treasury securities that comprise our cash equivalents and short-term investments are a Level 1. The fair value of financial instruments is not indicative of the overall fair value of our assets and liabilities since financial instruments do not include all assets, including intangibles and all liabilities.
|  | 2024 |  |  | 2023 |
|  | Carrying |  |  | Estimated |  |  | Carrying |  |  | Estimated |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In Millions) |
Senior Secured Notes (1) |  | $ | 478 |  |  | $ | 461 |  |  | $ | 575 |  |  | $ | 543 |
Short-Term Investments |  | $ | 164 |  |  | $ | 164 |  |  | $ | 207 |  |  | $ | 207 |
_____________________________ 1. Based on a quoted price of 96.38 as of December 31, 2024 and 94.50 as of December 31, 2023.

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- Definition The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480237/815-40-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5C -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-5C Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/815/tableOfContent + Details
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