CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue	$ 12,434,879	$ 14,157,929	$ 15,454,484
Cost of revenue	(12,023,284)	(13,758,403)	(15,660,536)
Gross profit (loss)	411,595	399,526	(206,052)
G&A	(216,451)	(201,522)	(139,819)
Impairment, restructuring & other exit costs	(43,792)	(108,357)	(318,442)
Gain (loss) on pension settlement	(198,132)	406	(137,898)
Foreign currency gain (loss)	(12,950)	(44,765)	(26,124)
Operating profit (loss)	(59,730)	45,288	(828,335)
Interest expense	(84,481)	(65,370)	(64,886)
Interest income	16,506	23,576	53,756
Earnings (loss) from Cont Ops before taxes	(127,705)	3,494	(839,465)
Income tax (expense) benefit	(16,489)	(15,856)	(481,965)
Net earnings (loss) from Cont Ops	(144,194)	(12,362)	(1,321,430)
Less: Net earnings (loss) from Cont Ops attributable to NCI	37,542	66,717	(38,788)
Net earnings (loss) attributable to Fluor Corporation from Cont Ops	(181,736)	(79,079)	(1,282,642)
Net earnings (loss) from Disc Ops attributable to Fluor	(258,434)	(355,967)	(239,522)
Net earnings (loss) attributable to Fluor	(440,170)	(435,046)	(1,522,164)
Less: Dividends on CPS	24,375	0	0
Net earnings (loss) available to Fluor common stockholders	$ (464,545)	$ (435,046)	$ (1,522,164)
Basic earnings (loss) per share attributable to Fluor
Net earnings (loss) from continuing operations (in dollars per share)	$ (1.46)	$ (0.56)	$ (9.16)
Net earnings from discontinued operations (in dollars per share)	(1.83)	(2.53)	(1.71)
Diluted earnings (loss) per share attributable to Fluor
Net earnings (loss) from continuing operations (in dollars per share)	(1.46)	(0.56)	(9.16)
Net earnings from discontinued operations (in dollars per share)	$ (1.83)	$ (2.53)	$ (1.71)