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Earnings Per Share - Schedule of Calculations of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Amounts Attributable to Parent, Disclosures [Abstract]          
Net earnings attributable to Fluor   $ 206 $ 22 $ 161 $ 136
Less: Dividends on CPS   10 10 29 29
Less: Make-whole payment on conversion of CPS   27 0 27 0
Net earnings available to Fluor common stockholders, basic   $ 169 $ 12 $ 105 $ 107
Weighted average common shares outstanding (shares)   144 142 143 142
Diluted effect:          
CPS (in shares)   0 0 0 0
Stock options, RSUs performance-based award units (in shares)   3 3 3 2
Contingently convertible debt (in shares)   0 0 0 0
Weighted average diluted shares outstanding (in shares)   147 145 146 144
Basic EPS available to Fluor common stockholders (in dollars per share)   $ 1.18 $ 0.08 $ 0.73 $ 0.75
Diluted EPS available to Fluor common stockholders (in dollars per share)   1.15 $ 0.08 0.72 $ 0.74
2029 Notes | Convertible Debt          
Diluted effect:          
Conversion price (in dollars per share) $ 45.37 $ 45.37   $ 45.37  
Stock price trigger (in dollar per share) $ 58.98