Operating Information by Segment and Geographic Area - Other Segment Profit (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Total segment profit	$ 94	$ 106	$ (47)	$ 201
Fluor Corporation | NuScale | Disposal Group, Not Discontinued Operations
Segment Reporting Information [Line Items]
Entity's interest in partnership or joint venture (percent)	56.00%		56.00%
Reportable Segments | Continuing Operations
Segment Reporting Information [Line Items]
Total segment profit	$ 191	108	$ 176	223
Reportable Segments | Other | Continuing Operations
Segment Reporting Information [Line Items]
Total segment profit	(14)	3	(104)	(11)
Reportable Segments | Other | NuScale | Continuing Operations
Segment Reporting Information [Line Items]
Total segment profit	(23)	(8)	(52)	(29)
Reportable Segments | Other | Stork | Continuing Operations
Segment Reporting Information [Line Items]
Total segment profit	9	8	10	12
Reportable Segments | Other | AMECO | Continuing Operations
Segment Reporting Information [Line Items]
Total segment profit	$ 0	$ 3	$ (62)	$ 6