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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Summary of Financial Instruments | At June 30, 2024 and December 31, 2023, we did not 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. Fair value of our Senior Secured Notes is classified as a Level 2 fair value measurement while the treasury securities that comprise our 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.
|  | June 30, 2024 |  |  | December 31, 2023 |
|  | Carrying |  |  | Estimated |  |  | Carrying |  |  | Estimated |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In Millions) |
Senior Secured Notes (1) |  | $ | 478 |  |  | $ | 459 |  |  | $ | 575 |  |  | $ | 543 |
Short-Term Investments |  | $ | — |  |  | $ | — |  |  | $ | 207 |  |  | $ | 207 |
_____________________________ 1. Based on a quoted price of 96.0 at June 30, 2024 and 94.5 at December 31, 2023. 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 No definition available. + Details
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