Description of Business	12 Months Ended
Description of Business	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Fluor Corporation (“we”, “us”, “our” or “the company”) is a holding company that owns the stock of a number of subsidiaries, as well as interests in joint ventures. Acting through these entities, we are one of the largest professional services firms providing engineering, procurement, construction, fabrication and modularization, operations, maintenance and asset integrity, as well as project management services, on a global basis. We provide services to our clients in a diverse set of industries worldwide including oil and gas, chemicals and petrochemicals, mining and metals, infrastructure, life sciences, advanced manufacturing and advanced technologies. We are also a service provider to the U.S. federal government and governments abroad; and, we perform operations, maintenance and asset integrity activities globally for major industrial clients. We had the following six reportable segments as of December 31, 2020: •Energy & Chemicals •Mining & Industrial •Infrastructure & Power •Government •Diversified Services •Other The Energy & Chemicals segment focuses on opportunities in the upstream, midstream, downstream, chemical, petrochemical, offshore and onshore oil and gas production, LNG and pipeline markets. This segment has long served a broad spectrum of industries offering a full range of design, engineering, procurement, construction, fabrication and project management services. The Mining & Industrial segment provides design, engineering, procurement, construction and project management services to the mining and metals, life sciences, advanced manufacturing and advanced technologies sectors. The Infrastructure & Power segment provides design, engineering, procurement, construction and project management services to the transportation and power sectors. The Government segment provides engineering and construction services, logistics and life-support, contingency operations support, management, mission operations, environmental remediation and decommissioning to the U.S. government and governments abroad. The Diversified Services segment provides a wide array of asset maintenance, asset integrity and staffing services around the world. Most of the operating results of our AMECO equipment business previously included in Diversified Services are now included in discontinued operations. Certain operations of AMECO, primarily in Mexico, are in the process of being liquidated and did not meet the qualifications of discontinued operations. These retained operations will remain in the Diversified Services segment until their liquidation. Other includes the operations of NuScale, as well as two lump-sum projects including a plant for which we serve as a subcontractor to a commercial client (the "Radford" project) and a weapons storage and maintenance facility (the "Warren" project). The Radford project is substantially complete with systems turnover to the client expected in the first quarter of 2021. In the first quarter of 2020, we decided to retain our government business, which had previously been included in Disc Ops. As a result, the government business is no longer reported as a discontinued operation for any period presented. Our plan to sell the AMECO equipment business remains unchanged and it remains reported as a discontinued operation. We expect to complete the sale of the AMECO equipment business within the first half of 2021. The assets and liabilities of the AMECO business are classified as held for sale for all periods presented. In the first quarter of 2021, we announced a plan to sell Stork, which we expect will be reported as a discontinued operation beginning with the first quarter of 2021.