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Earnings Per Share - Schedule of Calculations of Basic and Diluted EPS (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
day
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Income Amounts Attributable to Parent, Disclosures [Abstract]        
Net earnings (loss) attributable to Fluor | $ $ (697) $ 54 $ 1,522 $ 282
Weighted average common shares outstanding (shares) | shares 162,000,000 171,000,000 165,000,000 171,000,000
Diluted effect:        
Stock options, RSUs and performance-based award units (in shares) | shares 0 3,000,000 1,000,000 3,000,000
Convertible debt (in shares) | shares 0 0 0 0
Weighted average diluted shares outstanding (in shares) | shares 162,000,000 174,000,000 167,000,000 174,000,000
Basic EPS (in dollars per share) | $ / shares $ (4.30) $ 0.32 $ 9.21 $ 1.65
Diluted EPS (in dollars per share) | $ / shares (4.30) $ 0.31 9.13 $ 1.63
Additional shares to diluted shares outstanding during the quarter | shares   484,208    
2029 Notes (1.125% Convertible Senior Notes) | Convertible Debt        
Diluted effect:        
Conversion price (in dollars per share) | $ / shares $ 45.37   45.37  
Stock price trigger (in dollar per share) | $ / shares     $ 58.98  
Weighted average share price (in dollars per share) | $ / shares   $ 47.17    
2029 Notes (1.125% Convertible Senior Notes) | Convertible Debt | Debt Conversion Terms One        
Diluted effect:        
Threshold trading days | day     20  
Threshold consecutive trading days | day     30