Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Share-based compensation expense, net of adjustments Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Share-Based Liabilities Paid Urban Solutions Urban Solutions Segment [Member] Urban Solutions Segment Trading Arrangement: Trading Arrangement [Axis] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Title of 12(b) Security Title of 12(b) Security Carrying Value Reported Value Measurement [Member] Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Remaining performance obligation, period (in years) Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] Common stock — authorized 375,000,000 shares ($0.01 par value); issued and outstanding — 135,564,463 and 152,047,739 shares in 2026 and 2025, respectively Common Stock, Value, Issued Accrued salaries, wages and benefits ($11 and $9 related to VIEs in both periods) Accrued salaries, wages and benefits Employee-related Liabilities, Current Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Lines of Credit Line of Credit [Member] Maximum payments required under performance guarantees Guarantor Obligations, Maximum Exposure, Undiscounted Restatement Determination Date Restatement Determination Date Tax Jurisdiction of Domicile [Extensible Enumeration] Tax Jurisdiction of Domicile [Extensible Enumeration] Valuation allowance, net Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Unbilled receivables - reimbursable contracts Contract with Customer, Asset, after Allowance for Credit Loss Derivative Instrument [Axis] Derivative Instrument [Axis] Schedule of Effective Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Measurement Frequency [Axis] Measurement Frequency [Axis] Future funding commitment Funding Commitment [Member] Represents a funding commitment of the entity. 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Schedule of Performance-Based Awards Granted Share-Based Payment Arrangement, Activity [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Total current liabilities Liabilities, Current Increase (decrease) in taxes resulting from: Increase (Decrease) in Taxes Resulting From [Abstract] Increase (Decrease) in Taxes Resulting From Entity Address, City or Town Entity Address, City or Town Pending litigation Pending Litigation [Member] Granted (in shares) Performance-based Award Units Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Stock-Based Plans Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Santos Ltd Claim 2 Santos Ltd Claim 2 [Member] Santos Ltd Claim 2 Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Title of Individual [Domain] Title and Position [Domain] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Effect of forecast revision on estimated project cost Change in Forecast Estimate, Increase (Decrease) in Project Cost Represents the increase (decrease) in the estimated project cost based on forecast revisions. Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Total OCI, net of taxes OCI Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] 2024 Performance Award Plan 2024 Performance Award Plan [Member] 2024 Performance Award Plan Other Equity Method Investment Other Equity Method Investment Other Subsequent Event Type [Axis] Subsequent Event Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Claim revenue for costs Contracts Receivable, Claims and Uncertain Amounts Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Litigation Case [Axis] Litigation Case [Axis] Schedule of Operating Information and Assets by Reportable Segment Segment Reporting [Table Text Block] NCI Noncontrolling Interest [Member] Gain on sales of assets (including the sale of CFHI in 2026) Gain (Loss) on Disposition of Property Plant Equipment Related Party, Type [Axis] Related and Nonrelated Parties [Axis] Other NCI transactions Noncontrolling Interest, Increase (Decrease) Other Items Increase in noncontrolling interest balance because of other items which are not separately disclosed or provided for elsewhere in the taxonomy. Guarantees Guarantor Obligations [Line Items] Document Period End Date Document Period End Date Investing cash flow Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Schedule of Revenue by Project Location Schedule of Revenues from External Customers and Assets by Geographical Areas Table [Table Text Block] Tabular disclosure of information concerning assets located in identified geographic areas and the amount of revenue from external customers attributed to that country from which revenue is material. Net ( liability) assets Net Assets Security Exchange Name Security Exchange Name Contributions from NCI, net of distributions Noncontrolling Interest, Period Increase (Decrease) Other noncurrent liabilities Liabilities Noncurrent Excluding Long Term Debt Noncurrent Amount of obligation due after one year or beyond the normal operating cycle, if longer, excluding long-term debt. 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[Abstract] Revenue from Contract with Customer [Abstract] Additional shares to diluted shares outstanding during the quarter (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Guarantees Guarantees [Text Block] Changes in assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Reversal of revenue due to court ruling, amount repaid to customers Reversal Of Revenue Due To Court Ruling, Amount Repaid To Customers Reversal Of Revenue Due To Court Ruling, Amount Repaid To Customers Award Timing Predetermined Award Timing Predetermined [Flag] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Ownership share of equity method investees’ OCI Other Comprehensive Income (Loss) Net of Tax Equity Method Investments Other Comprehensive Income (Loss) Net of Tax Equity Method Investments Level 1 Fair Value, Inputs, Level 1 [Member] Effective tax rate, continuing operations (as a percent) 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Claim [Member] Relators Claim Antidilutive Securities [Axis] Antidilutive Securities [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Schedule of Calculations of Basic and Diluted EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Operating Information by Segment and Geographic Area Segment Reporting [Text Block] Long-term line of credit Long-Term Line of Credit Expiration Date Trading Arrangement Expiration Date Partnerships and Joint Ventures Variable Interest Entity Disclosure [Text Block] Committed Line of Credit Committed Credit Line [Member] Represents a credit line that legally binds the lender to provide funds. 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of Possible Loss Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common stock shares authorized (in shares) Common Stock, Shares Authorized Contract work in progress - lump-sum contracts Work In Progress, Contract Services Work In Progress, Contract Services Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Percent of earnings before taxes (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Measurement, Percent of Earnings Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Measurement, Percent of Earnings Exercise Price Award Exercise Price INVESTING CASH FLOW Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Fair Value, Measurements, Recurring Fair Value, Recurring [Member] Litigation Status [Axis] Litigation Status [Axis] 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Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Related party transaction, shares converted (in shares) Related Party Transaction, Shares Converted Related Party Transaction, Shares Converted Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Performance Guarantee Performance Guarantee [Member] Number Of Reportable Segments Disclosed By Definition Flag Number Of Reportable Segments Disclosed By Definition Flag Number Of Reportable Segments Disclosed By Definition Flag Adoption Date Trading Arrangement Adoption Date Debt instrument, interest rate, stated percentage (as a percent) Debt Instrument, Interest Rate, Stated Percentage Total shareholders’ equity Equity, Attributable to Parent Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Investment in NuScale Equity Securities, FV-NI, Current ASSETS  Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Marketable securities, current Debt Securities, Held-to-Maturity, Fair Value Other Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Performance-based awards for non-Section 16 executives Performance Shares [Member] Damages awarded to other party Loss Contingency, Damages Awarded, Value Purchase and retirement of debt Repayments of Debt Interest income (expense), net Interest Income (Expense), Nonoperating Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Contingencies and Commitments Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Anti-dilutive securities not included above (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Entity Central Index Key Entity Central Index Key APIC Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Corporate Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Guarantor Obligation [Table] Guarantor Obligation [Table] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Operating cash flow Cash Provided by (Used in) Operating Activity, Including Discontinued Operation U.S statutory federal income tax (benefit) expense Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Shareholders’ equity Shareholders’ equity Equity, Attributable to Parent [Abstract] Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Proceeds from repurchase of equity Proceeds from (Repurchase of) Equity Other Commitments [Domain] Other Commitments [Domain] City Area Code City Area Code AOCI AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Corporate Corporate Segment [Member] Debt Debt Instrument, Fair Value Disclosure Name Forgone Recovery, Individual Name Other noncurrent liabilities ($4 and $3 related to VIEs) Other Accrued Liabilities, Noncurrent Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Statement Statement [Line Items] Total noncurrent assets Assets, Noncurrent Mexico Joint Venture Mexico Joint Venture [Member] Mexico Joint Venture Total assets Total assets Assets Award vesting measurement, percent of TSR (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Measurement, Percent of TSR Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Measurement, Percent of TSR Income Amounts Attributable to Parent, Disclosures [Abstract] Income Amounts Attributable to Parent, Disclosures [Abstract] Convertible Debt Convertible Debt [Member] Less: Net earnings (loss) attributable to NCI Income (Loss) from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest Variable interest entity, not primary beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Operating Segments Operating Segments [Member] Interest expense Interest Expense, Nonoperating Stock-Based Compensation Share-Based Payment Arrangement [Text Block] PEO PEO [Member] Beginning Balance (in shares) Ending Balance (in shares) Shares, Outstanding Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Estimated tax effect Estimated Tax Effect On Divestiture Of Interest In Joint Venture Estimated Tax Effect On Divestiture Of Interest In Joint Venture Measurement Basis [Axis] Measurement Basis [Axis] Repurchase of common stock (in shares) Stock Repurchased and Retired During Period, Shares Marketable securities ($26 and $39 related to VIEs) Marketable securities, current Marketable Securities, Current Cash Equivalents Cash Equivalents [Member] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Noncontrolling interest Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount Weighted Average Grant Date Fair Value Per Share (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Revenue recognized that was included in contract liabilities as of January 1 Contract with Customer, Liability, Revenue Recognized Gain (loss) on the fair value of our investment in NuScale Equity Securities, FV-NI, Gain (Loss) Subsequent Event Type [Domain] Subsequent Event Type [Domain] Retained Earnings Retained Earnings [Member] Mission Solutions Mission Solutions Segment [Member] Mission Solutions segment will primarily focus on federal agencies across the U.S. government and select international opportunities. These include, among others, the Department of Energy, the Department of Defense, the Federal Emergency Management Agency and intelligence agencies. The Mission Solutions segment includes the Radford and Warren projects which were previously reported in the Other segment. Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Shareholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock shares outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Financial Instruments Not Required to be Measured at Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Diluted EPS (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Financing cash flow Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Litigation Case [Domain] Litigation Case [Domain] Equity method earnings, net of taxes Gain (Loss) on Sale of Previously Unissued Stock by Subsidiary or Equity Investee, Nonoperating Income Adjustments to reconcile net earnings to operating cash flow: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] FINANCING CASH FLOW Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] PP&E, net ($40 and $41 related to VIEs) PP&E, net ($40 and $41 related to VIEs) Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Financial Instruments [Domain] Financial Instruments [Domain] Schedule of Equity Method Earnings Equity Method Investments [Table Text Block] Stock price trigger (in dollar per share) Debt Instrument, Convertible, Stock Price Trigger Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Less: Comprehensive income (loss) attributable to NCI Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Fair Value Estimate of Fair Value Measurement [Member] Contract Assets and Liabilities Remaining Unsatisfied Performance Obligations Revenue from Contract with Customer [Text Block] Debt Instrument, Convertible Terms Of Conversion [Axis] Debt Instrument, Convertible Terms Of Conversion [Axis] Debt Instrument, Convertible Terms Of Conversion Number of referees appointed Loss Contingency, Trial Or Alternative Dispute Resolution, Number Of Referees Appointed Loss Contingency, Trial Or Alternative Dispute Resolution, Number Of Referees Appointed Other Payment for (Proceeds from) Other Investing Activity 2028 Notes (4.250% Senior Notes) Senior Notes, 4.25 Percent, Due 15 September 2028 [Member] Senior Notes 4.25 Percent Due 15 September 2028 [Member] State and local income taxes, net of federal income tax effects Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Energy Solutions Energy Solutions Segment [Member] Energy Solutions segment will focus on energy transition, chemicals, LNG, and traditional oil and gas markets. The segment will pursue new opportunities emerging in the energy transition markets including carbon capture, green chemicals, hydrogen, biofuels and other low carbon energy sources. The segment will also continue to provide EPC services for the oil, gas and petrochemical industries Segment Reporting [Table] Segment Reporting [Table] Income tax benefit (expense) attributable to equity method earnings Income Tax Expense Attributable to Equity Method of Investment Income Tax Expense Attributable to Equity Method of Investment Equity Method Investment [Table] Equity Method Investment [Table] Guarantees [Abstract] Guarantees [Abstract] Title of Individual [Axis] Title and Position [Axis] Cash Cash [Member] Other current assets ($17 and $26 related to VIEs) Other current assets Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating profit (loss) Total segment profit Operating Income (Loss) Expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Amount Asia Pacific (includes Australia) Asia Pacific [Member] Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Stock-based plan activity Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Investment in NuScale Equity Method Investments and Joint Ventures Disclosure [Text Block] Equity Components [Axis] Equity Components [Axis] Related Party Related Party [Member] Panel referred damages awarded from other party Loss Contingency, Panel Referred Damages Awarded from Other Party, Value Loss Contingency, Panel Referred Damages Awarded from Other Party, Value Cash paid for income taxes (net of refunds) Income Tax Paid, after Refund Received Information about contract liabilities: Information About Contract Liabilities [Abstract] Information About Contract Liabilities Entity Interactive Data Current Entity Interactive Data Current Earnings (loss) attributable to NCI Net Income (Loss) Attributable to Noncontrolling Interest Variable interest entity information Variable Interest Entity [Line Items] Deferred taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Comprehensive income attributable to Fluor Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Other Commitments [Axis] Other Commitments [Axis] Awards to employees, but are not deemed granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Awards Not Yet Granted, Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Awards Not Yet Granted, Shares Employees Employees [Member] Employees Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other assets ($7 and $17 related to VIEs) Other assets Other Assets, Noncurrent Document Type Document Type Fair value of assets and liabilities measured on recurring basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies Commitments and Contingencies Revenue Total revenue Revenues Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Estimated pre tax gain Equity Method Investment, Realized Gain (Loss) on Disposal Equity method earnings (loss) Income (Loss) from Equity Method Investments Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] 2025 Performance Award Plan VDI Plan 2025 [Member] VDI Plan 2025 Number of measurement periods Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Measurement, Number of Periods Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Measurement, Number of Periods Vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Middle East and Africa Middle East And Africa [Member] Represents information in the aggregate pertaining to the region of Middle East and the continent of Africa. LIABILITIES AND EQUITY  Liabilities and Equity [Abstract] Investments loss position in other accrued liabilities Accounts Payable, Other Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Measurements Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] SUPPLEMENTAL INFORMATION: Supplemental Cash Flow Information [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] PEO Name PEO Name Geographical [Axis] Geographical [Axis] Proceeds from the sale of NuScale shares Proceeds from Divestiture of Interest in Joint Venture Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number 2024 Performance Award Plan VDI Plan 2024 [Member] VDI Plan 2024 Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Other accrued liabilities ($24 and $31 related to VIEs) Other accrued liabilities Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Stock options, RSUs and performance-based award units All Other Classes of Stock [Member] All Other Classes of Stock Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Contract assets Contract Assets [Abstract] Contract Assets Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Principles of Consolidation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Measurement Frequency [Domain] Measurement Frequency [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Schedule of Debt Schedule of Debt [Table Text Block] Investment, Name [Domain] Investment, Name [Domain] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic EPS (in dollars per share) Earnings Per Share, Basic Schedule of Disclosure of Compensation Arrangements by Share-based Payment Award Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Repurchase of common stock Payments for Repurchase of Common Stock Contract liabilities ($163 and $254 related to VIEs) Contract liabilities Contract with Customer, Liability, Current Total current assets Assets, Current Insider Trading Arrangements [Line Items] Long-term debt Long-Term Debt, Excluding Current Maturities Total cost of revenue Cost of Revenue 2026 Performance Award Plan and 2025 Performance Award Plan 2026 Performance Award Plan and 2025 Performance Award Plan [Member] 2026 Performance Award Plan and 2025 Performance Award Plan Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Threshold trading days (in days) Debt Instrument, Convertible, Threshold Trading Days Central and South America Central And South America [Member] Represents information in the aggregate pertaining to the region of Central America and the continent of South America. Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Total tax payments Payments for Other Taxes Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] COOEC Fluor Heavy Industries Co., Ltd. Cooec Fluor Heavy Industries Co. Limited [Member] Represents COOEC Fluor Heavy Industries Co., Ltd., a joint venture of the entity. Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Total liabilities and equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] NCI Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Related Party, Type [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Total Shareholders' Equity Parent [Member] Convertible debt (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Name Awards Close in Time to MNPI Disclosures, Individual Name Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Noncurrent assets NONCURRENT ASSETS, VIEs Assets, Noncurrent [Abstract] G&A General and Administrative Expense Adjustment to Compensation: Adjustment to Compensation [Axis] Number of claims Loss Contingency, Pending Claims, Number Reserve for uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Amount Effect of forecast revision on estimated project cost (in dollars per share) Change In Forecast Estimate Increase Decrease In Project Cost Per Diluted Share Represents the increase (decrease) in estimated petrochemical project cost based on forecast revisions, in dollars per diluted share. Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Foreign Exchange Forward Foreign Exchange Forward [Member] Commitment amount Other Commitment Gain on sale of CFHI Gain on Sale of Investments Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable ($142 and $205 related to VIEs) Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Operating Segment [Member] Other Other Noncash Income (Expense) Financing Arrangements Debt Instrument [Line Items] Debt Conversion Terms One Debt Conversion Terms One [Member] Debt Conversion Terms One Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] APIC Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Name Trading Arrangement, Individual Name Cash and cash equivalents ($320 and $328 related to VIEs) Cash and cash equivalents Cash and Cash Equivalent Gain (loss) on the fair value of the forward sale of NuScale shares Debt and Equity Securities, Gain (Loss) Company Selected Measure Amount Company Selected Measure Amount Equity Method Investments and Joint Ventures [Abstract] Depreciation Depreciation, Depletion and Amortization Santos Ltd Santos Ltd [Member] Santos Ltd Stock-based plan activity (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Net earnings Net earnings Net earnings Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets CURRENT ASSETS, VIEs Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One North America North America [Member] Credit facility borrowings Line of Credit Facility, Fair Value of Amount Outstanding Income tax expense Total income tax expense (benefit) Income Tax Expense (Benefit) Foreign currency gain (loss) Gain (Loss), Foreign Currency Transaction, before Tax Loss contingency payments Loss Contingency Accrual, Payments Cost of revenue Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Accounts receivable, net ($134 and $142 related to VIEs) Accounts receivable, net Accounts and Financing Receivable, after Allowance for Credit Loss, Current Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Net earnings attributable to Fluor Net earnings attributable to Fluor Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] Other Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Restatement Determination Date: Restatement Determination Date [Axis] Uncommitted Line of Credit Uncommitted Credit Line [Member] Uncommitted Credit Line [Member] Schedule of Remaining Performance Obligation Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Interest income Investment Income, Interest Schedule of Contract Assets and Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Threshold consecutive trading days (in days) Debt Instrument, Convertible, Threshold Consecutive Trading Days SGI awards SGI Awards [Member] SGI Awards Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Damages sought Loss Contingency, Damages Sought, Value Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] UNITED STATES