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Other Comprehensive Income (Loss) - Changes in AOCI Balances by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	$ 1,584,092	$ 2,980,253	$ 3,403,361
Total OCI, net of tax	(36,150)	162,308	(143,227)
Ending balance	1,263,227	1,584,092	2,980,253
Other comprehensive income (loss) attributable to Fluor Corporation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(379,873)	(543,531)	(402,543)
OCI before reclassifications	(40,506)	13,162	(172,752)
Amounts reclassified from AOCI	3,473	150,496	31,764
Total OCI, net of tax	(37,033)	163,658	(140,988)
Ending balance	(416,906)	(379,873)	(543,531)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(242,950)	(309,800)	(211,478)
OCI before reclassifications	(18,010)	19,957	(98,322)
Amounts reclassified from AOCI	0	46,893	0
Total OCI, net of tax	(18,010)	66,850	(98,322)
Ending balance	(260,960)	(242,950)	(309,800)
Ownership Share of Equity Method Investees' OCI
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(35,456)	(23,672)	(32,614)
OCI before reclassifications	(19,076)	(12,304)	7,986
Amounts reclassified from AOCI	548	520	956
Total OCI, net of tax	(18,528)	(11,784)	8,942
Ending balance	(53,984)	(35,456)	(23,672)
DB Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(99,197)	(204,649)	(152,058)
OCI before reclassifications	(22,921)	4,006	(77,209)
Amounts reclassified from AOCI	3,529	101,446	24,618
Total OCI, net of tax	(19,392)	105,452	(52,591)
Ending balance	(118,589)	(99,197)	(204,649)
Unrealized Gain (Loss) on Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(2,270)	(5,410)	(5,684)
OCI before reclassifications	19,501	1,503	(5,207)
Amounts reclassified from AOCI	(604)	1,637	5,481
Total OCI, net of tax	18,897	3,140	274
Ending balance	16,627	(2,270)	(5,410)
Unrealized Gain (Loss) on Available- for-Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance		0	(709)
OCI before reclassifications			0
Amounts reclassified from AOCI			709
Total OCI, net of tax			709
Ending balance			0
Less: OCI attributable to NCI
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(5,051)	(3,701)	(1,462)
OCI before reclassifications	883	(1,350)	(2,239)
Amounts reclassified from AOCI	0	0	0
Total OCI, net of tax	883	(1,350)	(2,239)
Ending balance	(4,168)	(5,051)	(3,701)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(5,051)	(3,701)	(1,462)
OCI before reclassifications	883	(1,350)	(2,239)
Amounts reclassified from AOCI	0	0	0
Total OCI, net of tax	883	(1,350)	(2,239)
Ending balance	(4,168)	(5,051)	(3,701)
Ownership Share of Equity Method Investees' OCI
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	0	0	0
OCI before reclassifications	0	0	0
Amounts reclassified from AOCI	0	0	0
Total OCI, net of tax	0	0	0
Ending balance	0	0	0
DB Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	0	0	0
OCI before reclassifications	0	0	0
Amounts reclassified from AOCI	0	0	0
Total OCI, net of tax	0	0	0
Ending balance	0	0	0
Unrealized Gain (Loss) on Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	0	0	0
OCI before reclassifications	0	0	0
Amounts reclassified from AOCI	0	0	0
Total OCI, net of tax	0	0	0
Ending balance	$ 0	0	0
Unrealized Gain (Loss) on Available- for-Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance		$ 0	0
OCI before reclassifications			0
Amounts reclassified from AOCI			0
Total OCI, net of tax			0
Ending balance			$ 0

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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