CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Revenue	$ 3,978	$ 4,227	$ 7,959	$ 7,961
Cost of revenue	(3,922)	(4,049)	(7,762)	(7,683)
Gross profit	56	178	197	278
G&A	(52)	(50)	(88)	(110)
Foreign currency gain (loss)	(30)	48	(44)	60
Operating profit (loss)	(26)	176	65	228
Interest expense	(9)	(11)	(21)	(23)
Interest income	26	49	55	100
Earnings (loss) before taxes	(9)	214	99	305
Income tax expense (including $757 million and $684 million tax expense attributable to equity method earnings in 2025 Quarter and 2025 Period, respectively)	(765)	(61)	(712)	(111)
Net earnings (loss) before equity method earnings	(774)	153	(613)	194
Equity method earnings	3,212	0	2,819	0
Net earnings	2,438	153	2,206	194
Less: Net earnings (loss) attributable to NCI	(22)	(16)	(13)	(34)
Net earnings attributable to Fluor	$ 2,460	$ 169	$ 2,219	$ 228
Basic EPS (in dollars per share)	$ 14.93	$ 0.99	$ 13.30	$ 1.33
Diluted EPS (in dollars per share)	$ 14.81	$ 0.97	$ 13.19	$ 1.32

Income (Loss) from Continuing Operations, Net of Tax, Before Equity Method Investments, Noncontrolling Interest

No definition available.

Name:	flr_IncomeLossFromContinuingOperationsNetOfTaxBeforeEquityMethodInvestmentsNoncontrollingInterest
Namespace Prefix:	flr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.