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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2025
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following table delineates assets and liabilities that are measured at fair value on a recurring basis:
| December 31, 2025 |  | December 31, 2024
| Fair Value Hierarchy |  | Fair Value Hierarchy
(in millions) | Total | Level 1 | Level 2 | Level 3 |  | Total | Level 1 | Level 2 | Level 3
Assets: |  |  |  |  |  |  |  |  |
Investment in NuScale(1) | $ | 1,579 |  | $ | 1,579 |  | $ | — |  | $ | — |  |  | $ | 2,266 |  | $ | 2,266 |  | $ | — |  | $ | — |
NuScale forward contract(2) | 208 |  | — |  | 208 |  | — |  |  | — |  | — |  | — |  | — |
Trading securities(3) | 2 |  | 2 |  | — |  | — |  |  | 18 |  | 18 |  | — |  | — |
(1)We recognize the fair value of our investment in NuScale on a mark-to-market basis based upon the prevailing price of their stock on our balance sheet dates. (2)In November 2025, through an indirect, wholly-owned subsidiary, we entered into a variable price forward sale agreement whereby we pledged and granted a security interest in 71 million of our shares in NuScale, while maintaining continuing involvement and ownership rights, and committed to sell, convey, transfer, assign and deliver those shares at the final settlement date in the first quarter of 2026. The fair value of the forward contract, which met the definition of a derivative, represents the difference between the closing price of NuScale at December 31, 2025 and the year-to-date settlement price calculated per the agreement plus a discounted growth assumption through the estimated settlement date. The derivative asset was included in other current assets on the balance sheet as of December 31, 2025. Certain subsidiaries included in these consolidated financial statements, including Fluor Enterprises, Inc. and Nuke Holdings, LLC, are separate legal entities. The assets of these entities are not available to satisfy the debts or obligation of any other entity, including Fluor and its other subsidiaries. (3) Consists of registered money market funds and an equity index fund held in deferred compensation trusts. These investments represent the net asset value at the close of business of the period based on the last trade or official close of an active market or exchange.
Schedule of Carrying Values and Estimated Fair Values of Financial Instruments not Required to be Measured at Fair Value | The following summarizes information about financial instruments that are not required to be measured at fair value:
|  | December 31, 2025 |  | December 31, 2024
(in millions) | Fair Value Hierarchy | Carrying Value | Fair Value |  | Carrying Value | Fair Value
Assets: |  |  |  |  |  |
Cash(1) | Level 1 | $ | 1,480 |  | $ | 1,480 |  |  | $ | 1,613 |  | $ | 1,613 |
Cash equivalents(2) | Level 2 | 655 |  | 655 |  |  | 1,216 |  | 1,216 |
Marketable securities(2) | Level 2 | 59 |  | 59 |  |  | 130 |  | 130 |
Liabilities: |  |  |  |  |  |
2028 Senior Notes(3) | Level 2 | $ | 504 |  | $ | 503 |  |  | $ | 541 |  | $ | 517 |
2029 Senior Notes(3) | Level 2 | 566 |  | 657 |  |  | 563 |  | 725 |
_______________________________________________________________________________ (1)Cash consists of bank deposits. Carrying amounts approximate fair value. (2)Cash equivalents and marketable securities primarily consist of time deposits. Carrying amounts approximate fair value because of the short-term maturity of these instruments. Amortized cost is not materially different from the fair value. (3)The fair value of the Senior Notes was estimated based on quoted market prices and Level 2 inputs.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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