CONDENSED CONSOLIDATED STATEMENT OF EARNINGS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 4,090,993	$ 4,146,404	$ 8,209,549	$ 8,280,016
Cost of revenue	4,023,530	4,577,607	8,080,690	8,648,467
Other (income) and expenses
Corporate general and administrative expense	39,737	49,932	25,685	108,553
Impairment, restructuring and other exit costs	5,058	26,671	302,662	54,039
Interest expense	17,091	18,876	35,414	37,506
Interest income	(5,302)	(14,816)	(17,354)	(27,709)
Total cost and expenses	4,080,114	4,658,270	8,427,097	8,820,856
Earnings (loss) from Cont Ops before taxes	10,879	(511,866)	(217,548)	(540,840)
Income tax expense (benefit)	31,085	(75,757)	(35,747)	(60,500)
Net earnings (loss) from Cont Ops	(20,206)	(436,109)	(181,801)	(480,340)
Net earnings (loss) from Disc Ops	1,944	(16,591)	(92,911)	(17,405)
Net earnings (loss)	(18,262)	(452,700)	(274,712)	(497,745)
Less: Net earnings (loss) attributable to NCI from Cont Ops	6,728	(38,679)	16,237	(14,820)
Net earnings (loss) attributable to Fluor Corporation from Cont Ops	(26,934)	(397,430)	(198,038)	(465,520)
Net earnings (loss) attributable to Fluor Corporation from Disc Ops	1,944	(16,591)	(92,911)	(17,405)
Net earnings (loss) attributable to Fluor Corporation	$ (24,990)	$ (414,021)	$ (290,949)	$ (482,925)
Basic earnings (loss) per share attributable to Fluor Corporation
Earnings (loss) from continuing operations (in dollars per share)	$ (0.19)	$ (2.84)	$ (1.41)	$ (3.33)
Earnings (loss) from discontinued operations, net of taxes (in dollars per share)	0.01	(0.11)	(0.66)	(0.12)
Net earnings (loss) (in dollars per share)	(0.18)	(2.95)	(2.07)	(3.45)
Diluted earnings (loss) per share attributable to Fluor Corporation
Earnings (loss) from continuing operations (in dollars per share)	(0.19)	(2.84)	(1.41)	(3.33)
Earnings (loss) from discontinued operations, net of taxes (in dollars per share)	0.01	(0.11)	(0.66)	(0.12)
Net earnings (loss) (in dollars per share)	$ (0.18)	$ (2.95)	$ (2.07)	$ (3.45)