CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net earnings (loss) from Cont Ops	$ (144,194)	$ (12,362)	$ (1,321,430)
Net earnings (loss) from Disc Ops	(257,552)	(354,429)	(231,692)
Net earnings (loss)	(401,746)	(366,791)	(1,553,122)
OCI, net of tax:
Foreign currency translation adjustment	(37,433)	(17,127)	65,500
Ownership share of equity method investees' OCI	(1,692)	(18,528)	(11,784)
DB plan adjustments	100,972	(19,392)	105,452
Unrealized gain (loss) on hedges	(9,346)	18,897	3,140
Total OCI, net of tax	52,501	(36,150)	162,308
Comprehensive income (loss)	(349,245)	(402,941)	(1,390,814)
Less: Comprehensive income (loss) attributable to NCI	39,758	69,138	(32,310)
Comprehensive income (loss) attributable to Fluor	$ (389,003)	$ (472,079)	$ (1,358,504)