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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2026
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Summary of Financial Instruments | At March 31, 2026 and December 31, 2025, we did no t have any fin ancial instruments with fair values materially different from their carrying amounts (which excludes issuance costs, if applicable) except for our Senior Secured Notes. 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 fair value measurement. 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.
|  | March 31, 2026 |  |  | December 31, 2025 |
|  | Carrying |  |  | Estimated |  |  | Carrying |  |  | Estimated |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In Millions) |
Senior Secured Notes (1) |  | $ | 439 |  |  | $ | 435 |  |  | $ | 439 |  |  | $ | 436 |
Short-Term Investments |  | $ | 161 |  |  | $ | 161 |  |  | $ | 129 |  |  | $ | 129 |
_____________________________ (1) Based on a quoted price of 99.2 at March 31, 2026 and 99.5 at December 31, 2025. Also see discussion in Note 4 (B).

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- Definition The entire disclosure for financial instruments. This disclosure includes, but is not limited to, fair value measurements of short and long term marketable securities, international currencies forward contracts, and auction rate securities. Financial instruments may include hedging and non-hedging currency exchange instruments, derivatives, securitizations and securities available for sale at fair value. Also included are investment results, realized and unrealized gains and losses as well as impairments and risk management disclosures. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/825/tableOfContent + Details
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