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Earnings Per Share - Schedule of Calculations of Basic and Diluted EPS (Details)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
day
$ / shares
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Income Amounts Attributable to Parent, Disclosures [Abstract]        
Net earnings attributable to Fluor | $ $ 2,460 $ 169 $ 2,219 $ 228
Weighted average common shares outstanding (shares) | shares 165 171 167 171
Diluted effect:        
Stock options, RSUs and performance-based award units (in shares) | shares 1 3 1 2
Convertible debt (in shares) | shares 0 0 0 0
Weighted average diluted shares outstanding (in shares) | shares 166 174 168 173
Basic EPS (in dollars per share) | $ / shares $ 14.93 $ 0.99 $ 13.30 $ 1.33
Diluted EPS (in dollars per share) | $ / shares 14.81 $ 0.97 13.19 $ 1.32
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  
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