Operating Information by Segment and Geographic Area - Other Segment Profit (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating income (Loss)	$ 147	$ 209	$ (273)
Fluor Corporation | NuScale | Disposal Group, Not Discontinued Operations
Segment Reporting Information [Line Items]
Entity's interest in partnership or joint venture (percent)	55.00%
Reportable segments | Continuing Operations
Segment Reporting Information [Line Items]
Operating income (Loss)	$ 537	427	415
Reportable segments | Other | Continuing Operations
Segment Reporting Information [Line Items]
Operating income (Loss)	(228)	(27)	(31)
Reportable segments | Other | Continuing Operations | NuScale
Segment Reporting Information [Line Items]
Operating income (Loss)	(106)	(73)	(69)
Reportable segments | Other | Continuing Operations | Stork
Segment Reporting Information [Line Items]
Operating income (Loss)	(55)	45	32
Reportable segments | Other | Continuing Operations | AMECO
Segment Reporting Information [Line Items]
Operating income (Loss)	$ (67)	$ 1	$ 6