v3.26.1
Earnings Per Share - Schedule of Calculations of Basic and Diluted EPS (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2026
USD ($)
day
$ / shares
shares
Jun. 30, 2025
USD ($)
$ / shares
shares
Income Amounts Attributable to Parent, Disclosures [Abstract]        
Net earnings attributable to Fluor | $ $ 114 $ 2,460 $ 274 $ 2,219
Weighted average common shares outstanding (shares) 139,000,000 165,000,000 142,000,000 167,000,000
Diluted effect:        
Stock options, RSUs and performance-based award units (in shares) 1,000,000 1,000,000 1,000,000 1,000,000
Convertible debt (in shares) 1,000,000 0 1,000,000 0
Weighted average diluted shares outstanding (in shares) 141,000,000 166,000,000 144,000,000 168,000,000
Basic EPS (in dollars per share) | $ / shares $ 0.82 $ 14.93 $ 1.92 $ 13.30
Diluted EPS (in dollars per share) | $ / shares 0.81 $ 14.81 $ 1.89 $ 13.19
Additional shares to diluted shares outstanding during the quarter (in shares)     872,024  
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 (in days) | day     20  
Threshold consecutive trading days (in days) | day     30