Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Amounts Attributable to Parent, Disclosures [Abstract]
Net earnings (loss) attributable to Fluor	$ (107)	$ 48
Less: Dividends on CPS	10	10
Net earnings (loss) available to Fluor common stockholders, basic	$ (117)	$ 38
Weighted average common shares outstanding (shares)	142	142
Dilutive effect:
CPS (in shares)	0	0
Stock options, RSUs and performance-based award units (in shares)	0	2
Weighted average diluted shares outstanding (in shares)	142	144
EPS available to Fluor common stockholders, basic (in dollars per share)	$ (0.82)	$ 0.27
EPS available to Fluor common stockholders, diluted (in dollars per share)	$ (0.82)	$ 0.27