CONDENSED CONSOLIDATED STATEMENT OF EARNINGS - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
TOTAL REVENUE	$ 3,937,707,000	$ 3,842,235,000	$ 10,622,201,000	$ 11,268,305,000
TOTAL COST OF REVENUE	3,869,606,000	3,654,953,000	11,177,807,000	10,959,757,000
OTHER (INCOME) AND EXPENSES
Corporate general and administrative expense	10,362,000	61,058,000	115,426,000	134,726,000
Restructuring charges accrued during the period	333,988,000	0	388,027,000	0
Interest expense	18,984,000	24,238,000	56,490,000	58,131,000
Interest income	(13,965,000)	(9,504,000)	(40,695,000)	(24,777,000)
Total cost and expenses	4,218,975,000	3,730,745,000	11,697,055,000	11,127,837,000
EARNINGS (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES	(281,268,000)	111,490,000	(1,074,854,000)	140,468,000
INCOME TAX EXPENSE	490,077,000	28,710,000	368,289,000	39,260,000
NET EARNINGS (LOSS) FROM CONTINUING OPERATIONS	(771,345,000)	82,780,000	(1,443,143,000)	101,208,000
NET EARNINGS FROM DISCONTINUED OPERATIONS	41,806,000	13,245,000	76,810,000	113,920,000
NET EARNINGS (LOSS)	(729,539,000)	96,025,000	(1,366,333,000)	215,128,000
LESS: NET EARNINGS (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS FROM CONTINUING OPERATIONS	10,260,000	14,199,000	(18,918,000)	31,528,000
NET EARNINGS (LOSS) ATTRIBUTABLE TO FLUOR CORPORATION FROM CONTINUING OPERATIONS	(781,605,000)	68,581,000	(1,424,225,000)	69,680,000
LESS: NET EARNINGS ATTRIBUTABLE TO NONCONTROLLING INTERESTS FROM DISCONTINUED OPERATIONS	2,185,000	4,481,000	7,803,000	9,013,000
Net earnings (loss)	(741,984,000)	77,345,000	(1,355,218,000)	174,587,000
AMOUNTS ATTRIBUTABLE TO FLUOR CORPORATION
Net earnings (loss) from continuing operations	(781,605,000)	68,581,000	(1,424,225,000)	69,680,000
Net earnings (loss) attributable to Fluor Corporation from discontinued operations	39,621,000	8,764,000	69,007,000	104,907,000
Net earnings (loss)	$ (741,984,000)	$ 77,345,000	$ (1,355,218,000)	$ 174,587,000
BASIC EARNINGS (LOSS) PER SHARE ATTRIBUTABLE TO FLUOR CORPORATION
Earnings (loss) from continuing operations (in dollars per share)	$ (5.57)	$ 0.49	$ (10.17)	$ 0.49
Earnings (loss) from discontinued operations, net of taxes (in dollars per share)	0.28	0.06	0.49	0.75
Net earnings (loss) (in dollars per share)	(5.29)	0.55	(9.68)	1.24
DILUTED EARNINGS (LOSS) PER SHARE ATTRIBUTABLE TO FLUOR CORPORATION
Earnings (loss) from continuing operations (in dollars per share)	(5.57)	0.49	(10.17)	0.49
Earnings (loss) from discontinued operations, net of taxes (in dollars per share)	0.28	0.06	0.49	0.74
Net earnings (loss) (in dollars per share)	$ (5.29)	$ 0.55	$ (9.68)	$ 1.23
SHARES USED TO CALCULATE EARNINGS PER SHARE
BASIC (in shares)	140,163	140,713	140,027	140,489
DILUTED (in shares)	140,163	141,549	140,027	141,366
DIVIDENDS DECLARED PER SHARE (in dollars per share)	$ 0.21	$ 0.21	$ 0.63	$ 0.63