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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
Mar. 31, 2024
USD ($)
day
$ / shares
shares
Mar. 31, 2023
USD ($)
$ / shares
shares
Income Amounts Attributable to Parent, Disclosures [Abstract]    
Net earnings (loss) attributable to Fluor | $ $ 59 $ (107)
Less: Dividends on CPS | $ 0 10
Net earnings available to Fluor common stockholders, basic | $ $ 59 $ (117)
Weighted average common shares outstanding (shares) 171 142
Diluted effect:    
CPS (in shares) 0 0
Stock options, RSUs performance-based award units (in shares) 2 0
Contingently convertible debt (in shares) 0 0
Weighted average diluted shares outstanding (in shares) 173 142
Basic EPS available to Fluor common stockholders (in dollars per share) | $ / shares $ 0.35 $ (0.82)
Diluted EPS available to Fluor common stockholders (in dollars per share) | $ / shares 0.34 $ (0.82)
2029 Notes ($1.125% Convertible Senior Notes) | Convertible Debt    
Diluted effect:    
Conversion price (in dollars per share) | $ / shares 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