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Fair Value Measurements | 3 Months Ended
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Mar. 31, 2025
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements Investments The Company's investment assets are carried at fair value on the consolidated balance sheet in accordance with the Fair Value Measurements and Disclosures Topic in the ASC. They are valued with assistance from a third-party trustee and consist of exchange-traded funds, corporate bonds, asset-backed securities, government securities, and short-term time deposits. The exchange-traded funds are valued at quoted market prices determined in an active market, which are Level 1 inputs. The corporate bonds, asset-backed securities and government securities are valued using broker quotes that utilize observable market inputs, which are Level 2 inputs. The carrying amounts of time deposits, which are reported in the consolidated balance sheet using Level 2 inputs, approximate fair value due to their short-term nature. Unrealized losses as of March 31, 2025 and March 31, 2024 were not material. The Company believes any impairment of investments held with gross unrealized losses to be temporary and not the result of credit risk. The Company's investment assets are carried at fair value on the consolidated balance sheets, within the line items Short-term Investments and Other Long-term Assets, as summarized in the following table.
| March 31, 2025 |  | December 31, 2024
(Dollars in Millions) | Level 1 | Level 2 |  | Total |  | Level 1 | Level 2 |  | Total
Exchange-traded Funds | $ | 3 |  | $ | — |  |  | $ | 3 |  |  | $ | 2 |  | $ | — |  |  | $ | 2 |
Corporate Bonds | — |  | 73 |  |  | 73 |  |  | — |  | 71 |  |  | 71 |
Government Securities | — |  | 46 |  |  | 46 |  |  | — |  | 42 |  |  | 42 |
Asset-backed Securities | — |  | 35 |  |  | 35 |  |  | — |  | 35 |  |  | 35 |
Time Deposits | — |  | — |  |  | — |  |  | — |  | 66 |  |  | 66 |
Total Investments at Fair Value | $ | 3 |  | $ | 154 |  |  | $ | 157 |  |  | $ | 2 |  | $ | 214 |  |  | $ | 216 |
Total debt securities of $154 million as of March 31, 2025, and $214 million as of December 31, 2024, had an amortized cost of $156 million and $218 million, respectively. These investments have the following maturities:
(Dollars in Millions) | March 31, 2025 |  | December 31, 2024
Less than 1 year | $ | 8 |  |  | $ | 72 |
1 - 5 years | 79 |  |  | 72 |
5 - 10 years | 21 |  |  | 23 |
Greater than 10 years | 46 |  |  | 47 |
Total Investments at Fair Value (a) | $ | 154 |  |  | $ | 214 |
(a) Exchange-traded funds are excluded as there is no stated contractual maturity date. NOTE 9. Fair Value Measurements, continued Long-term Debt Long-term debt is reported at carrying amount on the consolidated balance sheets and is the Company's only financial instrument with fair values significantly different from their carrying amounts. The fair value of a company's debt is a measure of its current value under present market conditions, but does not impact the financial statements under current accounting rules. The majority of the Company's long-term debt is valued with assistance from a third party that utilizes closing transactions, market quotes or market values of comparable debt. For those instruments not valued by the third party, the fair value has been estimated by applying market rates of similar instruments to the scheduled contractual debt payments and maturities. These market rates are provided by the same third party. All of the inputs used to determine the fair value of the Company's long-term debt are Level 2 inputs. The fair value and carrying value of the Company's long-term debt is as follows:
(Dollars in Millions) | March 31, 2025 |  | December 31, 2024
Long-term Debt (Including Current Maturities): |  |  |
Fair Value | $ | 17,379 |  |  | $ | 16,481 |
Carrying Value | 19,126 |  |  | 18,503 |
Interest Rate Derivatives The Company’s fixed-to-floating swaps are carried at fair value, which is determined with assistance from a third party based upon pricing models using inputs observed from actively quoted markets. All of the inputs used to determine the fair value of the swaps are Level 2 inputs. The fair value of the Company’s fixed-to-floating interest rate swaps was an asset of $20 million and $7 million (for swaps entered in 2023 and 2025), and a liability of $110 million and $123 million (for swaps entered in 2022) as of March 31, 2025, and December 31, 2024, respectively. As of March 31, 2025 and December 31, 2024, the forward interest rate swap was fully settled and there is no related asset or liability. See Note 7, Debt and Credit Agreements, for further information.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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