| Cover Document | Aug. 01, 2019 | Jun. 30, 2019 |
| Cover page. | ||
| Entity Address, Address Line One | 6700 Las Colinas Blvd. | |
| Title of 12(b) Security | Common Stock, $.01 par value per share | |
| Entity Address, Postal Zip Code | 75039 | |
| Entity Registrant Name | FLUOR CORP | |
| Entity Incorporation, State or Country Code | DE | |
| Document Type | 8-K | |
| Document Period End Date | Aug. 1, 2019 | |
| Entity File Number | 001-16129 | |
| Entity Tax Identification Number | 33-0927079 | |
| City Area Code | 469 | |
| Local Phone Number | 398-7000 | |
| Trading Symbol | FLR | |
| Security Exchange Name | NYSE | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Entity Emerging Growth Company | false | |
| Entity Address, City or Town | Irving, | |
| Entity Address, State or Province | TX |
| Cover Non-printing | Aug. 01, 2019 |
| Cover page. | |
| Entity Central Index Key | 0001124198 |
| Amendment Flag | false |
