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Other Comprehensive Income (Loss) - Changes in AOCI Balances by Component (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Changes in AOCI balances by component (after-tax)
Balance, beginning of year	$ 1,771,394	$ 1,230,894	$ 1,263,227	$ 1,584,092
Total OCI, net of tax	(22,801)	14,825	(23,154)	(85,734)
Balance, end of year	1,843,654	1,306,684	1,843,654	1,306,684
Attributable to Fluor:
Changes in AOCI balances by component (after-tax)
Balance, beginning of year	(416,663)	(478,636)	(416,906)	(379,873)
Other comprehensive income (loss) before reclassifications	(22,655)	14,637	(16,876)	(86,800)
Amounts reclassified from AOCI	(2,501)	683	(8,037)	3,357
Total OCI, net of tax	(25,156)	15,320	(24,913)	(83,443)
Balance, end of year	(441,819)	(463,316)	(441,819)	(463,316)
Foreign Currency Translation
Changes in AOCI balances by component (after-tax)
Balance, beginning of year	(258,944)	(321,183)	(260,960)	(242,950)
Other comprehensive income (loss) before reclassifications	(21,067)	4,696	(19,051)	(73,537)
Amounts reclassified from AOCI	0	0	0	0
Total OCI, net of tax	(21,067)	4,696	(19,051)	(73,537)
Balance, end of year	(280,011)	(316,487)	(280,011)	(316,487)
Ownership Share of Equity Method Investees’ OCI
Changes in AOCI balances by component (after-tax)
Balance, beginning of year	(56,123)	(54,282)	(53,984)	(35,456)
Other comprehensive income (loss) before reclassifications	(3,117)	(171)	(5,540)	(19,270)
Amounts reclassified from AOCI	144	137	428	410
Total OCI, net of tax	(2,973)	(34)	(5,112)	(18,860)
Balance, end of year	(59,096)	(54,316)	(59,096)	(54,316)
DB Plans
Changes in AOCI balances by component (after-tax)
Balance, beginning of year	(115,747)	(97,196)	(118,589)	(99,197)
Other comprehensive income (loss) before reclassifications	(1)	0	(1)	0
Amounts reclassified from AOCI	1,164	1,070	4,006	3,071
Total OCI, net of tax	1,163	1,070	4,005	3,071
Balance, end of year	(114,584)	(96,126)	(114,584)	(96,126)
Unrealized Gain (Loss) on Hedges
Changes in AOCI balances by component (after-tax)
Balance, beginning of year	14,151	(5,975)	16,627	(2,270)
Other comprehensive income (loss) before reclassifications	1,530	10,112	7,716	6,007
Amounts reclassified from AOCI	(3,809)	(524)	(12,471)	(124)
Total OCI, net of tax	(2,279)	9,588	(4,755)	5,883
Balance, end of year	11,872	3,613	11,872	3,613
Attributable to NCI:
Changes in AOCI balances by component (after-tax)
Balance, beginning of year	(4,764)	(6,847)	(4,168)	(5,051)
Other comprehensive income (loss) before reclassifications	2,355	(495)	1,759	(2,291)
Amounts reclassified from AOCI	0	0	0	0
Total OCI, net of tax	2,355	(495)	1,759	(2,291)
Balance, end of year	(2,409)	(7,342)	(2,409)	(7,342)
Foreign Currency Translation
Changes in AOCI balances by component (after-tax)
Balance, beginning of year	(4,764)	(6,847)	(4,168)	(5,051)
Other comprehensive income (loss) before reclassifications	2,355	(495)	1,759	(2,291)
Amounts reclassified from AOCI	0	0	0	0
Total OCI, net of tax	2,355	(495)	1,759	(2,291)
Balance, end of year	(2,409)	(7,342)	(2,409)	(7,342)
Ownership Share of Equity Method Investees’ OCI
Changes in AOCI balances by component (after-tax)
Balance, beginning of year	0	0	0	0
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCI	0	0	0	0
Total OCI, net of tax	0	0	0	0
Balance, end of year	0	0	0	0
DB Plans
Changes in AOCI balances by component (after-tax)
Balance, beginning of year	0	0	0	0
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCI	0	0	0	0
Total OCI, net of tax	0	0	0	0
Balance, end of year	0	0	0	0
Unrealized Gain (Loss) on Hedges
Changes in AOCI balances by component (after-tax)
Balance, beginning of year	0	0	0	0
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCI	0	0	0	0
Total OCI, net of tax	0	0	0	0
Balance, end of year	$ 0	$ 0	$ 0	$ 0

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