CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Revenue	$ 15,474	$ 13,744	$ 14,156
Cost of revenue	(14,997)	(13,389)	(13,702)
Gross profit	477	355	454
G&A	(232)	(237)	(226)
Impairment	0	24	(290)
Gain (loss) on pension settlement	0	42	(198)
Foreign currency gain (loss)	(98)	25	(13)
Operating profit (loss)	147	209	(273)
Interest expense	(60)	(59)	(90)
Interest income	228	94	17
Earnings (loss) from Cont Ops before taxes	315	244	(346)
Income tax expense	(236)	(171)	(20)
Net earnings (loss) from Cont Ops	79	73	(366)
Less: Net earnings (loss) from Cont Ops attributable to NCI	(60)	(72)	39
Net earnings (loss) from Cont Ops attributable to Fluor	139	145	(405)
Net earnings (loss) from Disc Ops attributable to Fluor	0	0	(35)
Net earnings (loss) attributable to Fluor	139	145	(440)
Less: Dividends on CPS	29	39	24
Less: Make-whole payment on conversion of CPS	27	0	0
Net earnings (loss) available to Fluor common stockholders, basic	83	106	(464)
Net earnings (loss) available to Fluor common stockholders, diluted	$ 83	$ 106	$ (464)
Basic EPS available to Fluor common stockholders
Net earnings (loss) from Cont Ops (in dollars per share)	$ 0.55	$ 0.75	$ (3.04)
Net earnings (loss) from Disc Ops (in dollars per share)	0	0	(0.25)
Diluted EPS available to Fluor common stockholders
Net earnings (loss) from Cont Ops (in dollars per share)	0.54	0.73	(3.04)
Net earnings (loss) from Disc Ops (in dollars per share)	$ 0	$ 0	$ (0.25)