Fluor (FLR) 10-K 26 Feb 21 2020 FY Annual report Financial data

Cover page

Cover page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2020	Jan. 31, 2021	Jun. 30, 2020
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	1-16129
Entity Registrant Name	FLUOR CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	33-0927079
Entity Address, Address Line One	6700 Las Colinas Boulevard
Entity Address, City or Town	Irving,
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75039
City Area Code	469
Local Phone Number	398-7000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 1.7
Entity Common Stock, Shares Outstanding		140,759,346
Entity Central Index Key	0001124198
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
ICFR Auditor Attestation Flag	true
Common Stock | NEW YORK STOCK EXCHANGE, INC.
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, $.01 par value per share
Trading Symbol	FLR
Security Exchange Name	NYSE
Preferred Stock Purchase Rights | NEW YORK STOCK EXCHANGE, INC.
Entity Information [Line Items]
Title of 12(b) Security	Preferred Stock Purchase Rights
Trading Symbol	FLR
Security Exchange Name	NYSE

CONSOLIDATED STATEMENT OF OPERA

CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenue	$ 15,668,477	$ 17,317,284	$ 18,851,008
Cost of revenue	15,283,226	17,533,864	18,281,628
Other (income) and expenses
Corporate general and administrative expense	240,692	165,921	121,164
Impairment, restructuring and other exit costs	305,590	532,600	0
(Gain) loss on pension settlement	(406)	137,898	21,900
Interest expense	72,120	74,104	77,144
Interest income	(25,693)	(55,608)	(36,577)
Total cost and expenses	15,875,529	18,388,779	18,465,259
Earnings (loss) from Cont Ops before taxes	(207,052)	(1,071,495)	385,749
Income tax expense (benefit)	18,592	485,230	173,331
Net earnings (loss) from Cont Ops	(225,644)	(1,556,725)	212,418
Net earnings (loss) from Disc Ops	(141,147)	3,603	20,435
Net earnings (loss)	(366,791)	(1,553,122)	232,853
Less: Net earnings (loss) attributable to NCI from Cont Ops	68,255	(30,958)	59,385
Net earnings (loss) attributable to Fluor Corporation from Cont Ops	(293,899)	(1,525,767)	153,033
Net earnings (loss) attributable to Fluor Corporation from Disc Ops	(141,147)	3,603	20,435
NET EARNINGS (LOSS) ATTRIBUTABLE TO FLUOR CORPORATION	$ (435,046)	$ (1,522,164)	$ 173,468
Basic earnings (loss) per share attributable to Fluor Corporation
Net earnings (loss) from continuing operations (in dollars per share)	$ (2.09)	$ (10.89)	$ 1.09
Net earnings from discontinued operations (in dollars per share)	(1.01)	0.02	0.15
Net earnings (loss) (in dollars per share)	(3.10)	(10.87)	1.24
Diluted earnings (loss) per share attributable to Fluor Corporation
Net earnings (loss) from continuing operations (in dollars per share)	(2.09)	(10.89)	1.08
Net earnings from discontinued operations (in dollars per share)	(1.01)	0.02	0.15
Net earnings (loss) (in dollars per share)	$ (3.10)	$ (10.87)	$ 1.23

CONSOLIDATED STATEMENT OF COMPR

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ (366,791)	$ (1,553,122)	$ 232,853
OCI, net of tax:
Foreign currency translation adjustment	(17,127)	65,500	(100,561)
Ownership share of equity method investees' OCI	(18,528)	(11,784)	8,942
Defined benefit plan adjustments	(19,392)	105,452	(52,591)
Unrealized gain (loss) on hedges	18,897	3,140	274
Unrealized gain (loss) on available-for-sale securities	0	0	709
Total OCI, net of tax	(36,150)	162,308	(143,227)
Comprehensive income (loss)	(402,941)	(1,390,814)	89,626
Less: Comprehensive income (loss) attributable to NCI	69,138	(32,310)	57,145
Comprehensive income (loss) attributable to Fluor Corporation	$ (472,079)	$ (1,358,504)	$ 32,481

CONSOLIDATED BALANCE SHEET

CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents ($654,852 and $392,772 related to VIEs)	$ 2,198,781	$ 1,997,199
Marketable securities ($66 related to VIEs in both periods)	23,345	7,262
Accounts and notes receivable, net ($248,106 and $329,548 related to VIEs)	1,181,590	1,217,464
Contract assets ($244,552 and $294,116 related to VIEs)	967,827	1,238,173
Other current assets ($33,884 and $32,271 related to VIEs)	424,849	389,565
Current assets held for sale	237,617	517,100
Total current assets	5,034,009	5,366,763
Noncurrent assets
Property, plant and equipment ($37,236 and $29,492 related to VIEs)	561,084	594,826
Goodwill	349,258	508,415
Investments	532,065	600,814
Deferred taxes	77,915	62,688
Deferred compensation trusts	350,427	341,235
Other assets ($41,124 and $45,425 related to VIEs)	405,054	491,917
Total noncurrent assets	2,275,803	2,599,895
Total assets	7,309,812	7,966,658
Current liabilities
Accounts payable ($335,902 and $501,525 related to VIEs)	1,232,236	1,546,840
Short-term borrowings	25,415	38,728
Contract liabilities ($262,812 and $232,160 related to VIEs)	1,141,415	1,157,788
Accrued salaries, wages and benefits ($28,381 and $31,178 related to VIEs)	637,563	609,094
Other accrued liabilities ($44,244 and $21,088 related to VIEs)	490,104	470,350
Current liabilities related to assets held for sale	45,304	82,322
Total current liabilities	3,572,037	3,905,122
Long-term debt	1,710,033	1,651,739
Deferred taxes	80,745	83,295
Other noncurrent liabilities ($9,528 and $11,366 related to VIEs)	683,770	742,410
Contingencies and commitments
Shareholders' equity
Preferred stock — authorized 20,000,000 shares ($0.01 par value), none issued	0	0
Common stock — authorized 375,000,000 shares ($0.01 par value); issued and outstanding — 140,715,205 and 140,174,400 shares in 2020 and 2019, respectively	1,404	1,399
Additional paid-in capital	195,940	165,314
AOCI	(416,906)	(379,873)
Retained earnings	1,249,809	1,700,912
Total shareholders' equity	1,030,247	1,487,752
NCI	232,980	96,340
Total equity	1,263,227	1,584,092
Total liabilities and equity	$ 7,309,812	$ 7,966,658

CONSOLIDATED BALANCE SHEET (Par

CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS, VIEs
Cash and cash equivalents	$ 2,198,781	$ 1,997,199
Marketable securities, current	23,345	7,262
Accounts and notes receivable	1,181,590	1,217,464
Contract assets	967,827	1,238,173
Other current assets	424,849	389,565
NONCURRENT ASSETS, VIEs
Net property, plant and equipment	561,084	594,826
Other noncurrent assets	405,054	491,917
CURRENT LIABILITIES, VIEs
Trade accounts payable	1,232,236	1,546,840
Accrued salaries, wages and benefits	637,563	609,094
Other accrued liabilities	490,104	470,350
Other noncurrent liabilities ($9,528 and $11,366 related to VIEs)	$ 683,770	$ 742,410
Shareholders' equity
Preferred stock, authorized shares (in shares)	20,000,000	20,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, issued shares (in shares)	0	0
Common stock, authorized shares (in shares)	375,000,000	375,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued shares (in shares)	140,715,205	140,174,400
Common stock, outstanding shares (in shares)		140,174,400
Variable Interest Entity, Primary Beneficiary
CURRENT ASSETS, VIEs
Cash and cash equivalents	$ 654,852	$ 392,772
Marketable securities, current	66	66
Accounts and notes receivable	248,106	329,548
Contract assets	244,552	294,116
Other current assets	33,884	32,271
NONCURRENT ASSETS, VIEs
Net property, plant and equipment	37,236	29,492
Other noncurrent assets	41,124	45,425
CURRENT LIABILITIES, VIEs
Trade accounts payable	335,902	501,525
Contract liabilities	262,812	232,160
Accrued salaries, wages and benefits	28,381	31,178
Other accrued liabilities	44,244	21,088
Other noncurrent liabilities ($9,528 and $11,366 related to VIEs)	$ 9,528	$ 11,366

CONSOLIDATED STATEMENT OF CASH

CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING CASH FLOW
Net earnings (loss)	$ (366,791)	$ (1,553,122)	$ 232,853
Adjustments to reconcile net earnings (loss) to operating cash flow:
(Gain) loss on pension settlement	(406)	137,898	21,900
Write-off of cumulative translation loss	0	83,665	0
Depreciation	102,451	154,599	197,585
Amortization of intangibles	3,123	15,882	19,071
(Earnings) loss from equity method investments, net of distributions	(3,881)	9,348	980
(Gain) loss on sales of assets	(510)	7,284	(147,074)
Impairment of Long-Lived Assets Held-for-use	297,604	383,017	0
Amortization of stock-based awards	21,882	36,075	43,029
(Gain) loss on deferred compensation trust	(32,792)	(55,820)	18,010
(Gain) loss on deferred compensation obligation	34,039	54,490	(22,272)
Deferred taxes	(20,285)	320,633	60,709
Net retirement plan accrual (contributions)	(20,770)	(2,325)	(38,372)
Changes in assets and liabilities	29,801	633,027	(227,732)
Other	(3,281)	(5,633)	3,477
Operating cash flow	185,884	219,018	162,164
INVESTING CASH FLOW
Purchases of marketable securities	(35,078)	(31,165)	(483,513)
Proceeds from sales and maturities of marketable securities	19,648	238,539	541,104
Capital expenditures	(113,442)	(180,842)	(210,998)
Proceeds from sales of property, plant and equipment	62,692	65,977	81,038
Proceeds from sales of other assets	48,897	0	124,942
Investments in partnerships and joint ventures	(29,219)	(52,305)	(73,145)
Return of capital from partnerships and joint ventures	529	24,065	22,284
Proceeds from company owned life insurance	4,574	16,414	1,040
Other	(163)	(211)	(1,369)
Investing cash flow	(41,562)	80,472	1,383
FINANCING CASH FLOW
Repurchase of common stock	0	0	(50,022)
Dividends paid	(28,720)	(118,073)	(118,734)
Proceeds from issuance of 2028 Notes	0	0	598,722
Repayment of 2021 Notes	0	0	(503,285)
Debt issuance costs	0	0	(5,061)
Distributions paid to NCI	(23,184)	(33,674)	(63,523)
Capital contributions by NCI	110,051	64,646	5,128
Taxes paid on vested restricted stock	(1,313)	(3,572)	(5,686)
Stock options exercised	0	1,466	7,258
Other	(12,269)	2,815	(8,523)
Financing cash flow	48,446	(77,299)	(140,491)
Effect of exchange rate changes on cash	8,814	10,262	(62,385)
Increase (decrease) in cash and cash equivalents	201,582	232,453	(39,329)
Cash and cash equivalents at beginning of year	1,997,199	1,764,746	1,804,075
Cash and cash equivalents at end of year	2,198,781	1,997,199	1,764,746
Impairment expense - Disc Ops	145,700	0	0
Proceeds from (Repayments of) Other Debt	$ 3,881	$ 9,093	$ 3,235

CONSOLIDATED STATEMENT OF CHANG

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	AOCI	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Total Shareholders' Equity	Total Shareholders' EquityCumulative Effect, Period of Adoption, Adjustment	NCI	NCICumulative Effect, Period of Adoption, Adjustment
BALANCE, beginning of year (in shares) at Dec. 31, 2017			139,918
Beginning balance at Dec. 31, 2017	$ 3,403,361	$ (327,602)	$ 1,399	$ 88,222	$ (402,543)	$ 3,566,194	$ (326,639)	$ 3,253,272	$ (326,639)	$ 150,089	$ (963)
Increase (Decrease) in Shareholders' Equity
Net earnings (loss)	232,853					173,468		173,468		59,385
OCI	(143,227)				(140,988)			(140,988)		(2,239)
Dividends	(118,716)			153		(118,869)		(118,716)
Distributions to NCI	(63,523)									(63,523)
Capital contributions by NCI	5,128									5,128
Other NCI transactions	3,580			5,329				5,329		(1,749)
Stock-based plan activity (in shares)			833
Stock-based plan activity	$ 38,421		$ 8	38,413				38,421
Repurchase of common stock (in shares)	(1,100)		(1,097)
Repurchase of common stock	$ (50,022)		$ (11)	(50,011)				(50,022)
BALANCE, end of year (in shares) at Dec. 31, 2018			139,654
Ending balance at Dec. 31, 2018	$ 2,980,253		$ 1,396	82,106	(543,531)	3,294,154		2,834,125		146,128
Ending balance (ASC 842) at Dec. 31, 2018		20,544					20,544		20,544
Ending balance (ASC 606) at Dec. 31, 2018		11,934					11,934		11,934
Increase (Decrease) in Shareholders' Equity
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201409Member
Net earnings (loss)	$ (1,553,122)					(1,522,164)		(1,522,164)		(30,958)
OCI	162,308				163,658			163,658		(1,350)
Dividends	(103,252)			304		(103,556)		(103,252)
Distributions to NCI	(33,674)									(33,674)
Capital contributions by NCI	64,646									64,646
Other NCI transactions	545			48,997				48,997		(48,452)
Stock-based plan activity (in shares)			520
Stock-based plan activity	33,910		$ 3	33,907				33,910
BALANCE, end of year (in shares) at Dec. 31, 2019			140,174
Ending balance at Dec. 31, 2019	1,584,092	$ (1,977)	$ 1,399	165,314	(379,873)	1,700,912	$ (1,977)	1,487,752	$ (1,977)	96,340
Increase (Decrease) in Shareholders' Equity
Net earnings (loss)	(366,791)					(435,046)		(435,046)		68,255
OCI	(36,150)				(37,033)			(37,033)		883
Dividends	(14,120)					(14,120)		(14,120)
Distributions to NCI	(23,184)									(23,184)
Capital contributions by NCI	110,051									110,051
Other NCI transactions	(9,266)			10,099				10,099		(19,365)
Stock-based plan activity (in shares)			541
Stock-based plan activity	20,572		$ 5	20,527		40		20,572
BALANCE, end of year (in shares) at Dec. 31, 2020			140,715
Ending balance at Dec. 31, 2020	$ 1,263,227		$ 1,404	$ 195,940	$ (416,906)	$ 1,249,809		$ 1,030,247		$ 232,980
Increase (Decrease) in Shareholders' Equity
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201904Member

CONSOLIDATED STATEMENT OF CHA_2

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends (in dollars per share)	$ 0.10	$ 0.73	$ 0.84
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201904Member		us-gaap:AccountingStandardsUpdate201409Member

Description of Business

Description of Business	12 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Fluor Corporation (“we”, “us”, “our” or “the company”) is a holding company that owns the stock of a number of subsidiaries, as well as interests in joint ventures. Acting through these entities, we are one of the largest professional services firms providing engineering, procurement, construction, fabrication and modularization, operations, maintenance and asset integrity, as well as project management services, on a global basis. We provide services to our clients in a diverse set of industries worldwide including oil and gas, chemicals and petrochemicals, mining and metals, infrastructure, life sciences, advanced manufacturing and advanced technologies. We are also a service provider to the U.S. federal government and governments abroad; and, we perform operations, maintenance and asset integrity activities globally for major industrial clients. We had the following six reportable segments as of December 31, 2020: • Energy & Chemicals • Mining & Industrial • Infrastructure & Power • Government • Diversified Services • Other The Energy & Chemicals segment focuses on opportunities in the upstream, midstream, downstream, chemical, petrochemical, offshore and onshore oil and gas production, LNG and pipeline markets. This segment has long served a broad spectrum of industries offering a full range of design, engineering, procurement, construction, fabrication and project management services. The Mining & Industrial segment provides design, engineering, procurement, construction and project management services to the mining and metals, life sciences, advanced manufacturing and advanced technologies sectors. The Infrastructure & Power segment provides design, engineering, procurement, construction and project management services to the transportation and power sectors. The Government segment provides engineering and construction services, logistics and life-support, contingency operations support, management, mission operations, environmental remediation and decommissioning to the U.S. government and governments abroad. The Diversified Services segment provides a wide array of asset maintenance, asset integrity and staffing services around the world. Most of the operating results of our AMECO equipment business previously included in Diversified Services are now included in discontinued operations. Certain operations of AMECO, primarily in Mexico, are in the process of being liquidated and did not meet the qualifications of discontinued operations. These retained operations will remain in the Diversified Services segment until their liquidation. Other includes the operations of NuScale, as well as two lump-sum projects including a plant for which we serve as a subcontractor to a commercial client (the "Radford" project) and a weapons storage and maintenance facility (the "Warren" project). The Radford project is substantially complete with systems turnover to the client expected in the first quarter of 2021. In the first quarter of 2020, we decided to retain our government business, which had previously been included in Disc Ops. As a result, the government business is no longer reported as a discontinued operation for any period presented. Our plan to sell the AMECO equipment business remains unchanged and it remains reported as a discontinued operation. We expect to complete the sale of the AMECO equipment business within the first half of 2021. The assets and liabilities of the AMECO business are classified as held for sale for all periods presented. In the first quarter of 2021, we announced a plan to sell Stork, which we expect will be reported as a discontinued operation beginning with the first quarter of 2021.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Principles of Consolidation The financial statements include the accounts of Fluor Corporation and its subsidiaries. All significant intercompany transactions of consolidated subsidiaries are eliminated. Certain amounts disclosed in 2019 and 2018 have been reclassified to conform to the 2020 presentation, which includes presenting the operations of the government business in Cont Ops. Management has evaluated all material events occurring subsequent to December 31, 2020 through the filing date of the 2020 10-K. We frequently form joint ventures or partnerships with others primarily for the execution of single contracts or projects. If a joint venture or partnership is a VIE and we are the primary beneficiary, the joint venture or partnership is consolidated and our partners' interests are recognized as NCI. As is customary in our industry, for other construction partnerships and joint ventures, we generally recognize our proportionate share of revenue, cost and profit and use the one-line equity method for the investment. In other instances, the cost and equity methods of accounting are used, depending on our respective ownership interest and amount of influence on the entity, as well as other factors. At times, we also execute projects through collaborative arrangements for which we recognize our relative share of revenue and cost. Use of Estimates The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect reported amounts. These estimates are based on information available through the date of the issuance of the financial statements. Therefore, actual results could differ from those estimates. Foreign Currency Translation Our reporting currency is the U.S. dollar. For our international subsidiaries, the functional currency is typically the currency of the primary economic environment in which each subsidiary operates. Translation gains and losses are recorded in OCI. Gains and losses from remeasuring foreign currency transactions into the functional currency are included in earnings. Revenue Recognition Engineering and construction contracts. We recognize engineering and construction contract revenue over time as we provide services to satisfy our performance obligations. We generally use the cost-to-cost percentage-of-completion measure of progress as it best depicts how control transfers to our clients. The cost-to-cost approach measures progress towards completion based on the ratio of contract cost incurred to date compared to total estimated contract cost. Engineering and construction contracts are generally accounted for as a single unit of account (a single performance obligation) and are not segmented between types of services on a single project. Cost of revenue includes an allocation of depreciation and amortization. Where applicable, customer-furnished materials, labor and equipment and subcontractor materials, labor and equipment, are included in revenue and cost of revenue when management believes that we are acting as a principal rather than as an agent (i.e., we integrate the materials, labor and equipment into the deliverables promised to the customer). Customer-furnished materials are only included in revenue and cost when the contract includes construction activity and we have visibility into the amount the customer is paying for the materials or there is a reasonable basis for estimating the amount. We recognize revenue, but not profit, on certain uninstalled materials that are not specifically produced, fabricated, or constructed for a project. Revenue on these uninstalled materials is recognized when the cost is incurred and control is transferred. Changes to total estimated contract cost or losses, if any, are recognized in the period in which they are determined as assessed at the contract level. Pre-contract costs are expensed as incurred unless they are expected to be recovered from the client. Project mobilization costs are generally charged to project costs as incurred when they are an integrated part of the performance obligation being transferred to the client. Customer payments on engineering and construction contracts are typically due within 30 to 45 days of billing, depending on the contract. Service contracts. For the majority of our operations and maintenance contracts, revenue is recognized when services are performed and contractually billable. For all other service contracts, we recognize revenue over time using the cost-to-cost percentage-of-completion method. Service contracts that include multiple performance obligations are segmented between types of services. For contracts with multiple performance obligations, we allocate the transaction price to each performance obligation using an estimate of the stand-alone selling price of each distinct service in the contract. Revenue recognized on service contracts that has not been billed to clients is recorded as contract assets. Amounts billed to clients in excess of revenue recognized on service contracts to date are recorded as contract liabilities. Customer payments on service contracts are typically due within 30 to 90 days of billing, depending on the contract. Variable consideration. The nature of our contracts gives rise to several types of variable consideration, including claims, unpriced change orders, award and incentive fees, liquidated damages and penalties. We consider variable consideration in the development of our project forecasts so that our forecasted revenue reflects the amount of consideration we expect to be probable of recovering without a significant reversal. We estimate the amount of revenue to be recognized on variable consideration using the expected value method (i.e., the sum of probability-weighted amounts) or the most likely amount method, whichever offers better prediction. Warranties. We generally provide limited duration warranties for work performed under our contracts. Historically, warranty claims have not resulted in material costs incurred, and any estimated costs for warranties are included in the individual project cost estimates for purposes of accounting for long-term contracts. Practical Expedients. If we have a right to consideration from a customer in an amount that corresponds directly with the value of our performance completed to date (a service contract in which we bill a fixed amount for each hour of service provided), we recognize revenue in the amount to which we have a right to invoice for services performed. We do not adjust the contract price for the effects of a significant financing component where, at contract inception, the period between service provision and customer payment will be one year or less. We exclude from the measurement of the transaction price all taxes assessed by governmental authorities that are collected by us from our customers (use taxes, value added taxes, some excise taxes). RUPO. RUPO represents a measure of the value of work to be performed on contracts awarded and in progress. Although RUPO reflects business that is considered to be firm, cancellations, deferrals or scope adjustments may occur. RUPO is adjusted to reflect any known project cancellations, revisions to project scope and cost, foreign currency exchange fluctuations and project deferrals, as appropriate. RUPO differs from backlog discussed elsewhere in the 2020 10-K. Backlog includes the amount of revenue we expect to recognize under ongoing operations and maintenance contracts for the remainder of the current year renewal period plus up to three additional years if renewal is considered to be probable, while RUPO includes only the amount of revenue we expect to recognize under ongoing operations and maintenance contracts with definite terms and substantive termination provisions. Project Estimates Due to the nature of our industry, there is significant complexity in our estimation of total expected revenue and cost, for which we must make significant judgments. Our contracts with our customers may contain award fees, incentive fees, liquidated damages or other provisions that can either increase or decrease the contract price to arrive at estimated revenue. These variable amounts generally are earned upon achievement of certain performance metrics, program milestones or cost targets and can be based upon customer discretion. We estimate variable consideration at the most likely amount to which we expect to be entitled. We include estimated amounts in the transaction price to the extent it is probable we will realize that amount. Our estimates of variable consideration and our determination of its inclusion in project revenue for accounting purposes are based on an assessment of our anticipated performance and other information that may be available to us. At a project level, we have specific practices and procedures to review our estimate of total revenue and cost. Each project team reviews the progress and execution of our performance obligations, which impact the project’s accounting outcome. As part of this process, the project team reviews information such as any outstanding key contract matters, progress towards completion and the related program schedule and identified risks and opportunities. The accuracy of our revenue and profit recognition in a given period depends on the accuracy of our project estimates, which can change from period to period for factors such as: • Complexity in original design; • Extent of changes from original design; • Different site conditions than assumed in our bid; • The productivity, availability and skill level of labor; • Weather conditions when executing a project; • The technical maturity of the technologies involved; • Length of time to complete the project; • Availability and cost of equipment and materials; • Subcontractor and joint venture partner performance; • Expected costs of warranties; and • Our ability to recover for additional contract costs. We recognize changes in contract estimates on a cumulative catch-up basis in the period in which the changes are identified. Such changes in contract estimates can result in the recognition of revenue in a current period for performance obligations which were satisfied or partially satisfied in prior periods. Changes in contract estimates may also result in the reversal of previously recognized revenue if the current estimate adversely differs from the previous estimate. If we estimate that a project will have costs in excess of revenue, we recognize the total loss in the period it is identified. Contract Assets and Liabilities Contract assets represent revenue recognized in excess of amounts billed and include unbilled receivables (typically for cost reimbursable contracts) and contract work in progress (typically for fixed-price contracts). Unbilled receivables, which represent an unconditional right to payment subject only to the passage of time, are recognized as accounts receivable when they are billed under the terms of the contract. Advances that are payments on account of contract assets are deducted from contract assets. We anticipate that substantially all incurred cost associated with contract assets as of December 31, 2020 will be billed and collected within one year. Contract liabilities represent amounts billed to clients in excess of revenue recognized to date. Segment Reporting Management evaluates segment performance based on segment profit. We incur cost and expenses and hold certain assets at the corporate level which relate to our business as a whole. Certain of these amounts have been charged to our business segments by various methods, largely on the basis of usage. Total assets not allocated to segments and held in "Corporate and other" primarily include cash, marketable securities, income-tax related assets, pension assets, deferred compensation trust assets and corporate property, plant and equipment. Segment profit is an earnings measure that we utilize to evaluate and manage our business performance. Segment profit is calculated as revenue less cost of revenue and earnings attributable to NCI. Variable Interest Entities We assess our partnerships and joint ventures at inception to determine if any meet the qualifications of a VIE. We consider a partnership or joint venture a VIE if it has any of the following characteristics: (a) the total equity investment is not sufficient to permit the entity to finance its activities without additional subordinated financial support, (b) characteristics of a controlling financial interest are missing (either the ability to make decisions through voting or other rights, the obligation to absorb the expected losses of the entity or the right to receive the expected residual returns of the entity), or (c) the voting rights of the equity holders are not proportional to their obligations to absorb the expected losses of the entity and/or their rights to receive the expected residual returns of the entity, and substantially all of the entity's activities either involve or are conducted on behalf of an investor that has disproportionately few voting rights. Upon the occurrence of certain events, we reassess our initial determination of whether the partnership or joint venture is a VIE. The majority of our partnerships and joint ventures qualify as VIEs because the total equity investment is typically nominal and not sufficient to permit the entity to finance its activities without additional subordinated financial support. We also perform a qualitative assessment of each identified VIE to determine if we are its primary beneficiary. We conclude that we are the primary beneficiary and consolidate the VIE if we have both: (a) the power to direct the economically significant activities of the entity and (b) the obligation to absorb losses of, or the right to receive benefits from, the entity that could potentially be significant to the VIE. We consider the contractual agreements that define the ownership structure, distribution of profits and losses, risks, responsibilities, indebtedness, voting rights and board representation of the respective parties in determining if we are the primary beneficiary. We also consider all parties that have direct or implicit variable interests when determining whether we are the primary beneficiary. Management's assessment of whether we are the primary beneficiary of a VIE is continuously performed. Cash and Cash Equivalents Cash and cash equivalents include securities with maturities of three months or less at the date of purchase. Marketable Securities Marketable securities consist of time deposits placed with investment grade banks with original maturities greater than three months, which are typically held-to-maturity because we have the intent and ability to hold them until maturity. Held-to-maturity securities are carried at amortized cost. Our investments in debt securities are classified as available-for-sale because they may be sold prior to their maturity date. Available-for-sale securities are carried at fair value. The cost of securities sold is determined by using the specific identification method. Marketable securities are assessed at least annually for other-than-temporary impairment. Research and Development We have a controlling interest in NuScale, a research and development operation associated with the licensing and commercialization of small modular nuclear reactor technology. Since May 2014, NuScale has been receiving reimbursement from the DOE for certain qualified expenditures under cost-sharing award agreements that require NuScale to use the DOE funds to cover first-of-a-kind engineering costs associated with small modular reactor design development and certification. Costs incurred by NuScale are expensed as incurred, net of qualifying DOE reimbursements, and reported in "Cost of revenue". The U.S. Nuclear Regulatory Commission approved NuScale's design certification application in August 2020. Aside from NuScale, we generally do not engage in significant research and development activities. Property, Plant and Equipment Property, plant and equipment is recorded at cost. Leasehold improvements are amortized over the shorter of their economic lives or the lease terms. Depreciation is calculated using the straight-line method over the following ranges of estimated useful service lives, in years: Estimated Useful Service Lives Buildings 20 – 40 Building and leasehold improvements 6 – 20 Machinery and equipment 2 – 10 Furniture and fixtures 2 – 10 Goodwill and Intangible Assets Goodwill and intangible assets with indefinite lives are not amortized but are subject to at least annual impairment tests during the fourth quarter. For impairment testing, goodwill is allocated to the applicable reporting units based on the current reporting structure. We compare the fair value of each reporting unit with its carrying amount. If the carrying amount of a reporting unit exceeds its fair value, an impairment loss is recognized. Intangible assets with indefinite lives are impaired if their carrying value exceeds their fair value. In-process research and development associated with our investment in NuScale is considered indefinite lived until the related technology is available for commercial use. Interim impairment testing of goodwill and intangible assets is performed if indicators of potential impairment exist. Such indicators may include the results of operations of certain businesses and geographies and the performance of the company stock price. Intangible assets with finite lives are amortized on a straight-line basis over their useful lives. Income Taxes Deferred tax assets and liabilities are recognized for the expected future tax consequences of events that have been recognized in our financial statements or tax filings. We evaluate the realizability of our deferred tax assets and record a valuation allowance to reduce deferred tax assets to amounts that are more likely than not to be realized. The factors used to assess the likelihood of realization are our forecast of future taxable income and available tax planning strategies that could be implemented to realize such assets. Failure to achieve forecasted taxable income could affect the ultimate realization of deferred tax assets and could adversely impact our future effective tax rate. Income tax positions are recognized when they meet a more-likely-than-not recognition threshold. Previously recognized tax positions that no longer meet the more-likely-than-not threshold are derecognized upon such determination. We recognize potential interest and penalties related to unrecognized tax positions as a component of income tax expense. Judgment is required in determining the provision for income taxes as we consider our worldwide taxable earnings and the impact of the continuing audit process conducted by various tax authorities. The final outcome of any audits could differ materially from amounts recognized by the company. We account for the GILTI effects in the period that is subject to such tax. Derivatives and Hedging We attempt to limit foreign currency exposure in most of our contracts by denominating contract revenue in the currencies in which cost is incurred. Certain financial exposure, which includes currency and commodity price risk associated with engineering and construction contracts, currency risk associated with monetary assets and liabilities denominated in nonfunctional currencies and risk associated with interest rate volatility, may subject us to earnings volatility. We may implement a hedging strategy utilizing derivatives instruments or hedging instruments to mitigate such risk. Our hedging instruments are designated as either fair value or cash flow hedges. We formally document our hedge relationships at inception, including identification of the hedging instruments and the hedged items, our risk management objectives and strategies for undertaking the hedge transaction, and the initial quantitative assessment of the hedging instrument's effectiveness in offsetting changes in the fair value of the hedged items. We subsequently assess hedge effectiveness qualitatively, unless the hedge relationship is no longer highly effective. All hedging instruments are recorded at fair value. For fair value hedges, the change in fair value is offset against the change in the fair value of the underlying asset or liability through earnings. For cash flow hedges, the change in fair value is recorded as a component of AOCI and is reclassified into earnings when the hedged item settles. For derivatives that are not designated or do not qualify as hedging instruments, the change in the fair value of the derivative is offset against the change in the fair value of the underlying asset or liability through earnings. In certain limited circumstances, foreign currency payment provisions could be deemed embedded derivatives. If an embedded foreign currency derivative is identified, the derivative is bifurcated from the host contract and the change in fair value is recognized through earnings. We maintain master netting arrangements with certain counterparties to facilitate the settlement of derivative instruments; however, we report the fair value of derivatives on a gross basis. Concentrations of Credit Risk Accounts receivable and all contract work in progress are from clients in various industries and locations throughout the world. Most contracts require payments as the projects progress or, in certain cases, advance payments. We generally do not require collateral, but in most cases can place liens against the project assets or terminate the contract, if a material default occurs. We evaluate the counterparty credit risk as part of our project risk review process and in determining the appropriate level of reserves. We maintain reserves for potential credit losses and generally such losses have been minimal and within management's estimates. Cash and marketable securities are deposited with major banks throughout the world. Such deposits are placed with high quality institutions and the amounts invested in any single institution are limited to the extent possible in order to minimize concentration of counterparty credit risk. Our counterparties for derivatives are large financial institutions selected based on profitability, strength of balance sheet, credit ratings and capacity for timely payment of financial commitments. There are no significant concentrations of credit risk with any individual counterparty related to our derivative contracts. We monitor the credit quality of our counterparties and have not incurred any significant credit risk losses related to our deposits or derivative contracts. Stock-Based Plans Our stock plans provide for grants of nonqualified or incentive stock options, RSUs, restricted stock and performance-based award units, including VDI units. All grants of stock options and RSUs as well as performance-based units awarded to Section 16 officers in 2020, 2019 and 2018 can only be settled in company stock and are accounted for as equity awards. All expense under stock-based awards is recognized based on the fair values of the awards. Stock option awards have grant exercise prices equal to the grant date market price of the company's stock. The fair value of grants of RSUs and restricted stock is determined using the closing price of our common stock on the date of grant but may be discounted for any post-vest holding periods. The grant date fair value of performance-based award units is determined by adjusting the closing price of the company's common stock on the date of grant for any post-vest holding period discounts and for the effect of market conditions, when applicable. Stock-based compensation expense is generally recognized over the required service period, or over a shorter period when employee retirement eligibility is a factor. We also grant SGI awards and performance-based awards to non-Section 16 executives which are settled in cash. These awards are classified as liabilities and remeasured at fair value through expense at the end of each reporting period using our closing stock price until the awards are settled. Awards that may be settled in cash or company stock at the election of the recipient are also classified as liability awards. Leases We recognize right-of-use assets and lease liabilities for leases with terms greater than 12 months or leases that contain a purchase option that is reasonably certain to be exercised. Leases are classified as either finance or operating leases. This classification dictates whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. Our right-of use assets and lease liabilities primarily relate to office facilities, equipment used in connection with long-term construction contracts and other personal property. Certain of our facility and equipment leases include one or more options to renew, with renewal terms that can extend the lease term up to 10 years. The exercise of lease renewal options is at our discretion. Renewal periods are included in the expected lease term if they are reasonably certain of being exercised by us. Certain leases also include options to purchase the leased property. None of our lease agreements contain material residual value guarantees or material restrictions or covenants. Long-term leases (leases with terms greater than 12 months) are recorded as liabilities at the present value of the minimum lease payments not yet paid. We use our incremental borrowing rate to determine the present value of the lease when the rate implicit in the lease is not readily determinable. Certain lease contracts contain nonlease components such as maintenance, utilities, fuel and operator services. We recognize both the lease component and nonlease components as a single lease component for all of its right-of-use assets. From time to time, certain service or purchase contracts may contain an embedded lease.

Recent Accounting Pronouncement

Recent Accounting Pronouncements Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Accounting Pronouncements Implemented During 2020 On January 1, 2020, we adopted ASC Topic 326, “Financial Instruments - Credit Losses,” which replaces the incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of information to estimate credit losses. The new guidance requires financial assets measured at amortized cost to be presented at the net amount expected to be collected. We adopted ASC 326 using the modified retrospective method, and accordingly, the new guidance was applied to financial assets measured at amortized cost (primarily accounts receivable and contract assets) that existed as of January 1, 2020 (the date of initial application). As a result, we recorded additional reserves for credit losses of $2 million and a cumulative effect adjustment to decrease retained earnings by $2 million as of January 1, 2020. The adoption of ASC 326 did not have a material impact on our results of operations or any impact on our cash flows. We utilize a combination of methods for estimating expected credit losses including loss rates, aging schedules and probability-of-default. In evaluating our historical loss rates, accounts receivable and contract assets are pooled into the following categories based on similar risk characteristics: (1) EPC management; (2) government; (3) operations and maintenance; and (4) equipment leasing. Historical loss experience is adjusted for current conditions and reasonable and supportable forecasts, when applicable. Significantly aged receivables are evaluated individually by credit rating. Our reserve for credit losses amounted to $39 million and $35 million as of December 31, 2020 and 2019. In the first quarter of 2020, we adopted ASU 2019-12, “Simplifying the Accounting for Income Taxes,” which eliminates certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The adoption did not have a material impact on our financial statements. In the first quarter of 2020, we adopted ASU 2018-18, “Clarifying the Interaction between Topic 808 and Topic 606,” which clarifies that certain transactions between participants in a collaborative arrangement should be accounted for under ASC 606 when the counterparty is a customer. The adoption did not have any impact on our financial statements. In the first quarter of 2020, we adopted ASU 2018-17, “Targeted Improvements to Related Party Guidance for Variable Interest Entities,” which amends the guidance for determining whether a decision-making fee is a variable interest. The adoption did not have any impact on our financial statements. In the first quarter of 2020, we adopted ASU 2018-15, “Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” which requires customers in a hosting arrangement that is a service contract to capitalize certain implementation costs as if the arrangement was an internal-use software project. The adoption did not have any impact on our financial statements. In the first quarter of 2020, we adopted ASU 2018-13, “Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement,” which amends certain disclosure requirements for fair value measurements. For example, public companies will now be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. The adoption did not have any impact on our financial statements, but we have made additional disclosures related to the range and weighted average rates used to develop significant inputs for nonrecurring Level 3 measurements. In the fourth quarter of 2020, we adopted ASU 2018-14, “Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans,” which amends certain disclosure requirements related to defined benefit pension and other postretirement plans. The adoption did not have a material impact on our financial statements.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Potentially dilutive securities include stock options, RSUs, restricted stock and performance-based award units. Diluted EPS reflects the assumed exercise or conversion of all dilutive securities using the treasury stock method. Year Ended December 31, (in thousands, except per share amounts) 2020 2019 2018 Amounts attributable to Fluor Corporation: Net earnings (loss) from Cont Ops $ (293,899) $ (1,525,767) $ 153,033 Net earnings (loss) from Disc Ops (141,147) 3,603 20,435 Net earnings (loss) $ (435,046) $ (1,522,164) $ 173,468 Basic EPS attributable to Fluor Corporation: Weighted average common shares outstanding 140,511 140,061 140,413 Net earnings (loss) from Cont Ops $ (2.09) $ (10.89) $ 1.09 Net earnings (loss) from Disc Ops (1.01) 0.02 0.15 Net earnings (loss) $ (3.10) $ (10.87) $ 1.24 Diluted EPS attributable to Fluor Corporation: Weighted average common shares outstanding 140,511 140,061 140,413 Dilutive effects: Stock options, RSUs, restricted stock and performance-based award units (1) — — 859 Weighted average diluted shares outstanding 140,511 140,061 141,272 Net earnings (loss) from Cont Ops $ (2.09) $ (10.89) $ 1.08 Net earnings (loss) from Disc Ops (1.01) 0.02 0.15 Net earnings (loss) $ (3.10) $ (10.87) $ 1.23 (1) Anti-dilutive securities not included in shares outstanding 709 593 — During 2018, we repurchased and canceled 1.1 million shares of common stock for $50 million. Limited Duration Stockholder Rights Agreement In March 2020, the board of directors declared a dividend distribution of one preferred share purchase right for each outstanding share of our common stock, payable to holders of record as of April 10, 2020. The rights are designed to protect against unsolicited takeovers. The rights will be exercisable only if a person or group acquires 10% or more of our outstanding common stock. Each right will entitle stockholders to purchase one one thousandth of a share of a new series of junior participating preferred stock at an exercise price of $50. In addition, if a person or group acquires 10% of our outstanding common stock (unless such person or group acquires 50% or more), the board of directors may exchange one share of common stock for each outstanding right. Prior thereto, the rights are redeemable for $0.01 per right at the option of the board of directors. The rights are scheduled to expire in March 2021.

Operating Information by Segmen

Operating Information by Segment and Geographic Area	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Operating Information by Segment and Geographic Area	Operating Information by Segment and Geographic Area Year Ended December 31, (in millions) 2020 2019 2018 Revenue Energy & Chemicals $ 5,260.4 $ 5,823.7 $ 7,695.5 Mining & Industrial 4,149.1 5,057.2 3,491.0 Infrastructure & Power 1,595.5 1,370.4 1,668.0 Government 2,922.8 2,969.3 3,678.5 Diversified Services 1,630.9 2,040.1 2,257.2 Other 109.8 56.6 60.8 Total revenue $ 15,668.5 $ 17,317.3 $ 18,851.0 Segment profit (loss) Energy & Chemicals $ 163.7 $ (95.0) $ 334.5 Mining & Industrial 122.4 158.5 94.3 Infrastructure & Power 13.7 (243.9) (30.1) Government 88.4 200.3 187.3 Diversified Services 14.2 14.6 68.7 Other (85.4) (220.1) (144.7) Total segment profit $ 317.0 $ (185.6) $ 510.0 Depreciation (all but Corporate included in segment profit) Energy & Chemicals $ — $ — $ — Mining & Industrial — — — Infrastructure & Power 10.0 7.3 6.7 Government 4.0 4.0 3.6 Diversified Services 21.9 34.5 52.1 Other 1.7 2.8 3.2 Corporate 64.9 61.7 59.8 Total depreciation (1) $ 102.5 $ 110.3 $ 125.4 Capital expenditures Energy & Chemicals $ — $ — $ — Mining & Industrial — — — Infrastructure & Power 28.8 12.2 24.5 Government 3.2 3.0 6.9 Diversified Services 24.6 33.6 46.9 Other 3.4 1.5 1.8 Corporate 30.0 62.5 90.0 Total capital expenditures (2) $ 90.0 $ 112.8 $ 170.1 December 31, 2020 December 31, 2019 Total assets Energy & Chemicals $ 1,004.6 $ 1,139.3 Mining & Industrial 508.5 594.9 Infrastructure & Power 469.3 471.3 Government 575.4 629.1 Diversified Services 950.6 1,290.6 Other 38.1 68.5 Corporate 3,574.7 3,379.3 Discontinued Operations - Assets held for sale 188.6 393.7 Total assets $ 7,309.8 $ 7,966.7 Goodwill Energy & Chemicals $ 12.6 $ 12.6 Mining & Industrial 9.2 8.2 Infrastructure & Power 2.5 2.5 Government 58.0 58.0 Diversified Services 260.8 420.9 Other 6.2 6.2 Total Goodwill $ 349.3 $ 508.4 (1) Depreciation of $44 million and $72 million during 2019 and 2018, respectively, was included in discontinued operations and excluded from the table above. (2) Capital expenditures of $23 million, $68 million and $41 million during 2020, 2019 and 2018, respectively, were included in discontinued operations and excluded from the table above. Energy & Chemicals. The revenue of a single Energy & Chemicals customer and its affiliates amounted to 12% of our consolidated revenue during 2020. The revenue of a different Energy & Chemicals customer and its affiliates amounted to 11% and 18% of our consolidated revenue during 2019 and 2018, respectively. Segment profit in 2020 included the adverse impacts of the recognition of reserves totaling $60 million for expected credit losses associated with certain joint venture clients, as well as margin diminution on a percentage-of-completion basis resulting from project positions taken with respect to COVID-19 related schedule delays and associated cost growth. Segment loss in 2019 included charges associated with forecast revisions on certain projects including $260 million (or $1.85 per share) for cost growth on an offshore project; $87 million (or $0.62 per share) for cost growth on two downstream projects and scope reductions on a large upstream project; $26 million (or $0.19 per share) for the write-off of pre-contract costs, $26 million (or $0.19 per share) on embedded foreign currency derivatives and $31 million (or $0.22 per share) from the resolution of close-out matters. Segment profit in 2018 included charges of $133 million (or $0.89 per share) for cost growth on a completed, downstream project and $40 million (or $0.23 per share) for cost growth on the aforementioned offshore project. We are currently in discussions with the clients of the two lump-sum, downstream projects mentioned above over unapproved change orders totaling $66 million for cost growth and extension of time due to client-caused delays. Our current forecasts are based on the probability of favorably resolving these matters. Revenue and segment profit could be adversely affected if these matters are not successfully resolved, including the assessment of liquidated damages for which our combined maximum exposure for both projects is approximately $121 million. Mining & Industrial. Segment profit in 2019 included a gain of $31 million (or $0.16 per share) resulting from a favorable resolution of a longstanding customer dispute on a mining project. Infrastructure & Power. Segment profit in 2020 included a positive settlement on a canceled rail project offset by charges for cost growth in the infrastructure legacy portfolio. Segment loss in 2019 included charges totaling $135 million (or $0.96 per share) for the settlement of client disputes and cost growth on certain close-out matters for three power projects that were substantially complete as of December 31, 2019. Segment loss in 2019 was further driven by charges totaling $133 million (or $0.95 per share) resulting from late engineering changes, schedule-driven cost growth and negotiations with clients and subcontractors on pending change orders, for several infrastructure projects. Segment loss in 2018 included charges totaling $188 million (or $1.02 per share) resulting from cost growth at one of the aforementioned power projects. The charges in 2018 were largely offset by a gain of $125 million (or $0.74 per share) on the sale of a joint venture interest in the United Kingdom. Government. Revenue from work performed for various agencies of the U.S. government amounted to 18%, 15% and 18% of our consolidated revenue during 2020, 2019 and 2018, respectively. During 2019, we settled with a client in connection with the cancellation of two subcontracts at nuclear power plant projects in South Carolina and Georgia. The settlement resolved our claims arising prior to the bankruptcy filing in March 2017. Proceeds from the settlement were received during 2019. As a result of the settlement, we de-recognized pre-petition accounts receivable of $68 million and also recorded $89 million of previously unrecognized service fee revenue. Diversified Services. During 2020, 2019 and 2018, intercompany revenue for the Diversified Services segment, excluded from the amounts shown above, was $270 million, $322 million and $332 million, respectively. Other . Segment loss in 2019 included charges of $59 million (or $0.42 per share) on the Warren project and $83 million (or $0.59 per share) on the Radford project for various engineering and cost growth associated with the facilities. Segment loss in 2018 of $56 million (or $0.30 per share) was driven by forecast revisions on the Radford project. There were no similar material charges in 2020. Segment loss for all periods included the operations of NuScale, which are primarily for research and development activities associated with the licensing and commercialization of small modular nuclear reactor technology. NuScale expenses included in the determination of segment loss were $84 million, $66 million and $74 million during 2020, 2019 and 2018, respectively. NuScale expenses in 2020, 2019 and 2018 were reported net of qualified reimbursable expenses of $71 million, $56 million and $62 million, respectively. Reconciliation of Total Segment Profit (Loss) to Earnings (Loss) from Continuing Operations Before Taxes Year Ended December 31, (in millions) 2020 2019 2018 Total segment profit (loss) $ 317.0 $ (185.6) $ 510.0 Corporate general and administrative expense (240.7) (165.9) (121.2) Impairment, restructuring and other exit costs (305.6) (532.6) — Gain (loss) on pension settlement 0.4 (137.9) (21.9) Interest income (expense), net (46.4) (18.5) (40.6) Earnings (loss) attributable to NCI from continuing operations 68.2 (31.0) 59.4 Earnings (loss) from continuing operations before taxes $ (207.1) $ (1,071.5) $ 385.7 Foreign currency exchange gains and (losses) of ($47 million), ($27 million) and $33 million were included in Corporate G&A during 2020, 2019 and 2018, respectively. Operating Information by Geographic Area Revenue by project location Total Assets (in millions) 2020 2019 2018 2020 2019 North America $ 9,806.4 $ 8,439.7 $ 8,982.1 $ 3,982.4 $ 3,728.8 Asia Pacific (includes Australia) 1,398.2 1,763.3 1,494.0 562.1 533.7 Europe 2,517.5 3,731.6 5,326.6 1,403.9 1,906.9 Central and South America 1,388.1 2,375.3 1,262.6 812.8 1,233.6 Middle East and Africa 558.3 1,007.4 1,785.7 548.6 563.7 Total $ 15,668.5 $ 17,317.3 $ 18,851.0 $ 7,309.8 $ 7,966.7

Impairment, Restructuring and O

Impairment, Restructuring and Other Exit Costs	12 Months Ended
	Dec. 31, 2020
Restructuring and Related Activities [Abstract]
Impairment, Restructuring and Other Exit Costs	Impairment, Restructuring and Other Exit Costs Restructuring and Other Exit Costs During 2019, we initiated a restructuring plan designed to optimize costs and improve operational efficiency. These efforts primarily relate to the rationalization of resources, investments, real estate and overhead across various geographies, as well as the liquidation of certain components of the AMECO business that are being excluded from sale. Our planned restructuring activities were substantially completed by the end of 2020. Restructuring costs totaled $8 million and $240 million during 2020 and 2019, respectively. Information about our restructuring, which we believe is complete as of December 31, 2020, follows: (in millions) Costs Incurred in 2020 Costs Incurred in Restructuring and other exit costs: Severance $ 6.6 $ 63.9 Asset impairments 0.4 90.4 Entity liquidation costs (including the recognition of cumulative translation adjustments) — 83.7 Other exit costs 1.0 2.0 Total restructuring and other exit costs $ 8.0 $ 240.0 Asset impairment charges included the write down of assets held for sale to fair value less cost to sell and the write down of certain other assets to fair value. The fair value of assets and liabilities held for sale and other impaired assets, primarily construction equipment, was estimated using observable Level 2 inputs for identical assets. See Note 24 for a summary of assets and liabilities classified as held for sale as of December 31, 2020 and 2019. The fair value of the other impaired assets was $25 million as of December 31, 2019. These assets were included in "Property, plant and equipment" and "Other assets". The fair value of these other assets was estimated using observable Level 2 inputs for identical assets. A reconciliation of restructuring liabilities follow: (in thousands) Severance Lease Exit Costs Other Total Balance as of December 31, 2019 $ 46,303 $ 570 $ 307 $ 47,180 Restructuring charges accrued during the period 6,965 334 687 7,986 Cash payments / settlements during the period (32,292) (799) (993) (34,084) Currency translation 2,282 1 (1) 2,282 Balance as of December 31, 2020 $ 23,258 $ 106 $ — $ 23,364 Impairment Impairment expense is summarized as follows: Year Ended December 31, (in thousands) 2020 2019 Impairment expense: Goodwill associated with the Diversified Services reporting unit $ 168,568 $ 2,125 Intangible customer relationships associated with Stork 26,671 33,657 Equity method investments in the Energy & Chemicals segment 86,096 256,769 Information technology assets 16,269 — Total impairment expense $ 297,604 $ 292,551 2020 Impairment Our business has been adversely affected by the economic impacts of the outbreak of COVID-19 and the steep decline in oil prices that occurred in the early part of 2020. These events have created significant uncertainty and economic volatility and disruption, which have impacted and may continue to impact our business. We have experienced, and may continue to experience, reductions in demand for certain of our services and the delay or abandonment of ongoing or anticipated projects due to our clients’, suppliers’ and other third parties’ diminished financial condition or financial distress, as well as governmental budget constraints. These impacts are expected to continue or worsen under prolonged stay-at-home, social distancing, travel restrictions and other similar orders or restrictions. Significant uncertainty still exists concerning the magnitude of the impact and duration of these events. Because of these events, we performed interim impairment testing of our goodwill, intangible assets and investments and recognized the above impairment expense during the first quarter of 2020. As part of our assessment of goodwill, the fair value of the reporting units was determined using an income based approach that utilized unobservable Level 3 inputs, including significant management assumptions such as expected awards, forecasted revenue and operating margins, weighted average cost of capital, working capital assumptions and general market trends and conditions. The customer relationships' valuation approach utilized unobservable Level 3 inputs including ranges of assumptions of long-term revenue growth from 2% to 5.5% with a weighted average of 2.4%, weighted average cost of capital of 12% and a customer attrition factor of 10%. The valuation of the equity method investments utilized unobservable Level 3 inputs based on the forecast of anticipated volumes and overhead absorption in a cyclical business. 2019 Impairment During 2019, we recognized impairment expense on our intangible customer relationships associated with Stork. The fair value of the customer relationships was determined by a third party using an income-based approach that utilized unobservable Level 3 inputs, including significant management assumptions such as forecasted revenue and operating margins, customer attrition and weighted average cost of capital. The net carrying value of the customer relationships was $31 million as of December 31, 2019. We also evaluated our significant investments and determined that certain of our investments were impaired during 2019. The fair value of these investments were determined using income-based approaches that utilized unobservable Level 3 inputs, including significant management assumptions such as forecasted revenue and operating margins and weighted average cost of capital. The net carrying value of these investments totaled $95 million as of December 31, 2019.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes In March 2020, the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”) was enacted. The CARES Act, among other things, includes provisions relating to net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations and deferral of employer payroll taxes. We recorded a discrete benefit of $125 million due to utilization of a 2019 net operating loss in the carryback period. Prior to the CARES Act, this loss could only be carried forward and was offset by a valuation allowance. Through December 31, 2020, we have deferred payroll taxes of $41 million under the CARES Act, with approximately half of the deferral payable in 2021 and and the remainder payable in 2022. The income tax expense (benefit) components recognized in continuing operations follow: Year Ended December 31, (in thousands) 2020 2019 2018 Current: Federal $ (121,411) $ (36,591) $ (19,199) Foreign 140,551 163,141 115,281 State and local 5,343 4,295 12,377 Total current 24,483 130,845 108,459 Deferred: Federal 17,451 325,351 16,800 Foreign (23,342) 9,593 55,208 State and local — 19,441 (7,136) Total deferred (5,891) 354,385 64,872 Total income tax expense $ 18,592 $ 485,230 $ 173,331 A reconciliation of U.S. statutory federal income tax expense (benefit) to income tax expense (benefit) from continuing operations follows: Year Ended December 31, (in thousands) 2020 2019 2018 U.S. statutory federal tax expense (benefit) $ (43,481) $ (225,014) $ 81,007 Increase (decrease) in taxes resulting from: State and local income taxes (10,614) (11,135) (13,668) U.S. tax on GILTI — — 10,649 NCI (9,466) 11,565 (7,200) Foreign tax differential, net 38,667 13,479 1,460 Valuation allowance, net 148,783 730,787 79,168 Other changes to uncertain tax positions 7,484 4,098 7,753 Stranded tax effects from AOCI — (35,619) — Impact of tax reform — — (1,373) CARES Act Benefit (124,753) — — Other, net 11,972 (2,931) 15,535 Total income tax expense $ 18,592 $ 485,230 $ 173,331 Deferred taxes reflect the tax effects of differences between the amounts recorded as assets and liabilities for financial reporting purposes and the amounts recorded for income tax purposes. The tax effects of significant temporary differences giving rise to deferred tax assets and liabilities are as follows: December 31, (in thousands) 2020 2019 Deferred tax assets: Accrued liabilities not currently deductible: Employee compensation and benefits $ 104,305 $ 116,162 Project and non-project reserves 71,999 60,768 Net operating loss carryforward 326,402 357,803 Tax basis of investment in excess of book basis 118,915 88,255 U.S. foreign tax credit carryforward 414,348 226,845 AOCI 62,681 67,258 Other 103,955 85,059 Total deferred tax assets 1,202,605 1,002,150 Valuation allowance (1,080,752) (910,336) Deferred tax assets, net $ 121,853 $ 91,814 Deferred tax liabilities: Book basis of property and equipment in excess of tax basis (43,475) (29,846) Dividend withholding on unremitted non-U.S. earnings (57,859) (49,663) Other (23,349) (32,912) Total deferred tax liabilities (124,683) (112,421) Deferred tax assets, net of deferred tax liabilities $ (2,830) $ (20,607) As of December 31, 2020, we are indefinitely reinvested only with respect to unremitted earnings required to meet our working capital and long-term investment needs in the foreign jurisdictions within which we operate. Beyond those limits, we expect current earnings to be available for distribution. Deferred tax liabilities of approximately $28 million have not been recorded with respect to unremitted earnings that are considered indefinitely reinvested, again primarily associated with foreign withholding and income taxes that would be due upon remittance. We have no intention of initiating any actions that would lead to taxation of the earnings deemed indefinitely reinvested. We have U.S federal and state net operating loss carryforwards of $159 million and $908 million, respectively. The federal net operating loss carryforwards can be carried forward indefinitely. If not used, the state net operating loss carryforwards will begin to expire in 2021. Approximately $117 million of the state net operating loss carryforwards will expire in 2021. We also have non-U.S. net operating loss carryforwards related to various jurisdictions of approximately $1.2 billion. Non-U.S. net operating losses include $599 million in the United Kingdom and $345 million in the Netherlands as of December 31, 2020. Of the total non-U.S. losses, $800 million can be carried forward indefinitely. The majority of the remaining $296 million net operating losses, if unused, will expire between 2023 and 2028. We had U.S. foreign tax credits of approximately $414 million as of December 31, 2020, which will begin to expire in 2028, but which are fully reserved for in our valuation allowance During 2020 and 2019, we were in a three-year cumulative loss on a consolidated, jurisdictional basis in Australia, the Netherlands, the U.K. and the U.S. Such cumulative loss constitutes significant negative evidence (with regards to future taxable income) for assessing likelihood of realization. We also considered positive evidence but concluded it did not outweigh this significant negative evidence of a three-year cumulative loss. Accordingly, we recognized non-cash charges to tax expense of $142 million and $602 million to record a valuation allowance against net U.S. deferred tax assets and $28 million and $129 million against certain net foreign deferred tax assets during 2020 and 2019, respectively. In the normal course of business, we are subject to examination by taxing authorities worldwide, including such major jurisdictions as Australia, Canada, the Netherlands, South Africa, the United Kingdom, and the United States. Although we believe our reserves for our tax positions are reasonable, the outcome of tax audits could be materially different, both favorably and unfavorably. With a few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations for years before 2012. A summary of unrecognized tax benefits follows: (in thousands) 2020 2019 Balance at beginning of year $ 42,394 $ 55,476 Change in tax positions of prior years 8,166 6,359 Change in tax positions of current year — — Reduction in tax positions for statute expirations (1,510) (16,894) Reduction in tax positions for audit settlements (637) (2,547) Balance at end of year $ 48,413 $ 42,394 If recognized, the total amount of unrecognized tax benefits as of December 31, 2020 and 2019, would favorably impact the effective tax rates by $30 million and $22 million, respectively. We had $11 million and $10 million of accrued interest and penalties as of December 31, 2020 and 2019, respectively. We do not anticipate any significant changes to the unrecognized tax benefits within the next twelve months. U.S. and foreign earnings (loss) from continuing operations before taxes are as follows: Year Ended December 31, (in thousands) 2020 2019 2018 United States $ (265,682) $ (968,280) $ (252,376) Foreign 58,630 (103,215) 638,125 Total $ (207,052) $ (1,071,495) $ 385,749

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information The changes in assets and liabilities included in operating cash flow follow: Year Ended December 31, (in thousands) 2020 2019 2018 (Increase) decrease in: Accounts and notes receivable, net $ 138,388 $ 210,419 $ (40,632) Contract assets 280,360 207,467 (83,774) Other current assets 3,893 (80,248) 168,021 Other assets 109,405 100,527 (25,424) Increase (decrease) in: Accounts payable (343,113) (46,873) 176,335 Contract liabilities (53,580) 202,359 (307,844) Accrued liabilities (11,829) 29,880 (75,878) Other liabilities (93,723) 9,496 (38,536) Increase (decrease) in cash due to changes in assets and liabilities $ 29,801 $ 633,027 $ (227,732) Cash paid during the year for: Interest $ 65,641 $ 71,938 $ 66,514 Income taxes (net of refunds) 65,188 204,080 (28,408)

Partnerships and Joint Ventures

Partnerships and Joint Ventures	12 Months Ended
	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Partnerships and Joint Ventures	Partnerships and Joint Ventures In the normal course of business, we form partnerships or joint ventures primarily for the execution of single contracts or projects. The majority of these partnerships or joint ventures are characterized by a 50 percent or less, noncontrolling ownership or participation interest, with decision making and distribution of expected gains and losses typically being proportionate to the ownership or participation interest. Many of the partnership and joint venture agreements provide for capital calls to fund operations, as necessary. Accounts receivable related to work performed for unconsolidated partnerships and joint ventures included in "Accounts and notes receivable, net" were $218 million and $149 million as of December 31, 2020 and 2019, respectively. The following is a summary of aggregate, unaudited balance sheet data for unconsolidated entities where our investment is presented as a one-line equity method investment: December 31, (in millions) 2020 2019 Current assets $ 8,138 $ 6,927 Noncurrent assets 4,745 5,109 Current liabilities 6,307 4,605 Noncurrent liabilities 4,354 5,256 The following is a summary of aggregate, unaudited income statement data for unconsolidated entities where the equity method of accounting is used to recognize our share of net earnings or loss of investees: (in millions) 2020 2019 2018 Revenue $ 1,209 $ 1,258 $ 1,465 Cost of revenue 1,104 1,151 1,338 Net earnings 54 45 35 During 2020 and 2019, we evaluated our significant investments and determined that certain of our investments were impaired. As a result, we recognized impairment expense of $86 million and $257 million during 2020 and 2019, respectively. One of our more significant joint ventures is COOEC Fluor, in which we have a 49% ownership interest. COOEC Fluor owns, operates and manages the Zhuhai Fabrication Yard in China’s Guangdong province. We completed our final funding commitment to the joint venture of $26 million during 2021. During 2020, we sold our interests in three infrastructure joint ventures and recognized a gain of $8 million. We also sold our 50% interest in an Energy & Chemicals joint venture during 2020 and recognized a loss of $11 million. Variable Interest Entities The net carrying value of the unconsolidated VIEs (classified under both investments and other accrued liabilities) was a net asset of $174 million and $217 million as of December 31, 2020 and 2019, respectively. Some of our VIEs have debt; however, such debt is typically non-recourse in nature. Our maximum exposure to loss as a result of our investments in unconsolidated VIEs is typically limited to the aggregate of the carrying value of the investment and future funding necessary to satisfy the contractual obligations of the VIE. Future funding commitments as of December 31, 2020 for the unconsolidated VIEs were $72 million. In some cases, we are required to consolidate certain VIEs. As of December 31, 2020, the carrying values of the assets and liabilities associated with the operations of the consolidated VIEs were $1.3 billion and $703 million, respectively. As of December 31, 2019, the carrying values of the assets and liabilities associated with the operations of the consolidated VIEs were $1.1 billion and $798 million, respectively. The assets of a VIE are restricted for use only for the particular VIE and are not available for our general operations. We have agreements with certain VIEs to provide financial or performance assurances to clients, as discussed elsewhere.

Guarantees

Guarantees	12 Months Ended
	Dec. 31, 2020
Guarantees [Abstract]
Guarantees	Guarantees In the ordinary course of business, we enter into various agreements providing performance assurances and guarantees to our clients on behalf of certain unconsolidated and consolidated partnerships, joint ventures and other jointly executed contracts. These agreements are entered into primarily to support project execution commitments. The performance guarantees have various expiration dates ranging from mechanical completion of the project to a period extending beyond contract completion. The maximum potential amount of future payments that we could be required to make under outstanding performance guarantees, which represents the remaining cost of work to be performed, was estimated to be $14 billion as of December 31, 2020. For cost reimbursable contracts, amounts that may become payable pursuant to guarantee provisions are normally recoverable from the client for work performed. For lump-sum contracts, the performance guarantee amount is the cost to complete the contracted work, less amounts remaining to be billed to the client under the contract. Remaining billable amounts could be greater or less than the cost to complete. In those cases where costs exceed the remaining amounts payable under the contract, we may have recourse to third parties, such as owners, partners, subcontractors or vendors for claims. The performance guarantee obligation was not material as of December 31, 2020 and 2019. Financial guarantees, made in the ordinary course of business in certain limited circumstances, are entered into with financial institutions and other credit grantors and generally obligate the company to make payment in the event of a default by the borrower. These arrangements generally require the borrower to pledge collateral to support the fulfillment of the borrower's obligation.

Contingencies and Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Commitments	Contingencies and Commitments We and certain of our subsidiaries are subject to litigation, claims and other commitments and contingencies arising in the ordinary course of business. Although the asserted value of these matters may be significant, we currently do not expect that the ultimate resolution of any open matters will have a material adverse effect on our financial position or results of operations. Since May 2018, purported shareholders have filed various complaints against Fluor Corporation and certain of its current and former executives in the U.S. District Court for the Northern District of Texas. The plaintiffs purport to represent a class of shareholders who purchased or otherwise acquired Fluor common stock from August 14, 2013 through February 14, 2020, and seek to recover damages arising from alleged violations of federal securities laws. These claims are based on statements concerning Fluor’s internal and disclosure controls, risk management, revenue recognition, and Fluor’s gas-fired power business, which plaintiffs assert were materially misleading. As of May 26, 2020, these complaints have been consolidated into one matter. We filed a motion to dismiss the matter on July 1, 2020. While no assurance can be given as to the ultimate outcome of this matter, we do not believe it is probable that a loss will be incurred. Accordingly, we have not recorded a charge as a result of this action. Since September 2018, ten separate purported shareholders' derivative actions were filed against current and former members of the Board of Directors, as well as certain of Fluor’s current and former executives. Fluor Corporation is named as a nominal defendant in the actions. These derivative actions purport to assert claims on behalf of Fluor Corporation and make substantially the same factual allegations as the securities class action matter discussed above and seek various forms of monetary and injunctive relief. These actions are pending in Texas state court (District Court for Dallas County), the U.S. District Court for the District of Delaware, the U.S. District Court for the Northern District of Texas, and the Court of Chancery of the State of Delaware. Certain of these actions have been consolidated and stayed until our motion to dismiss is ruled upon in the securities class action matter. While no assurance can be given as to the ultimate outcome of this matter, we do not believe it is probable that a loss will be incurred. Accordingly, we have not recorded a charge as a result of these actions. Fluor Australia Ltd., our wholly-owned subsidiary (“Fluor Australia”), completed a cost reimbursable engineering, procurement and construction management services project for Santos Ltd. (“Santos”) involving a large network of natural gas gathering and processing facilities in Queensland, Australia. On December 13, 2016, Santos filed an action in Queensland Supreme Court against Fluor Australia, asserting various causes of action and seeking damages and/or a refund of contract proceeds paid of approximately AUD $1.47 billion. Santos has joined Fluor Corporation to the matter on the basis of a parent company guarantee issued for the project. We believe that the claims asserted by Santos are without merit and we are vigorously defending these claims. While no assurance can be given as to the ultimate outcome of this matter, we do not believe it is probable that a loss will be incurred. Accordingly, we have not recorded a charge as a result of this action. Fluor Limited, our wholly-owned subsidiary (“Fluor Limited”), and Fluor Arabia Limited, a partially-owned subsidiary (“Fluor Arabia”), completed cost reimbursable engineering, procurement and construction management services for Sadara Chemical Company (“Sadara”) involving a large petrochemical facility in Jubail, Kingdom of Saudi Arabia. On August 23, 2019, Fluor Limited and Fluor Arabia Limited commenced arbitration proceedings against Sadara after it refused to pay invoices totaling approximately $100 million due under the parties’ agreements. As part of the arbitration proceedings, Sadara has asserted various counterclaims for damages and/or a refund of contract proceeds paid totaling approximately $574 million against Fluor Limited and Fluor Arabia Limited. We believe that the counterclaims asserted by Sadara are without merit and are vigorously defending these claims. While no assurance can be given as to the ultimate outcome of the counterclaims, we do not believe it is probable that a loss will be incurred in excess of amounts reserved for this matter. Accordingly, we have not recorded a charge as a result of the counterclaims. Various wholly-owned subsidiaries of Fluor, in conjunction with a partner, TECHINT, (“Fluor/TECHINT”) performed engineering, procurement and construction management services on a cost reimbursable basis for Barrick involving a gold mine and ore processing facility on a site straddling the border between Argentina and Chile. In 2013, Barrick terminated the Fluor/TECHINT agreements for convenience and not due to the performance of Fluor/TECHINT. On August 12, 2016, Barrick filed a notice of arbitration against Fluor/TECHINT, demanding damages and/or a refund of contract proceeds paid of not less than $250 million under various claims relating to Fluor/TECHINT’s alleged performance. Proceedings were suspended while the parties explored a possible settlement. In August 2019, Barrick drew down $36 million of letters of credit from Fluor/TECHINT ($24 million from Fluor and $12 million from TECHINT). Thereafter, Barrick proceeded to reactivate the arbitration. In December 2020, Barrick and Fluor/TECHINT exchanged detailed statements of claim and counterclaim pursuant to which Barrick’s claim against Fluor/TECHINT now totals approximately $330 million. We believe that the claims asserted by Barrick are without merit and are vigorously defending these claims. While no assurance can be given as to the ultimate outcome of this matter, we do not believe it is probable that a loss will be incurred. Accordingly, we have not recorded a charge as a result of these claims. Purple Line Transit Partners, LLC (“PLTP”) entered into a Public Private Partnership Agreement (“PPPA”) with the Maryland Department of Transportation and the Maryland Transit Administration (together, the “State”) for the finance, design, construction, and operation of the Purple Line Project, a new light rail line in Maryland (the “Project”). PLTP is a limited liability company in which Fluor has a 15% membership interest. PLTP entered into an Amended and Restated Design-Build Contract (the “DB Contract”) with Purple Line Transit Constructors, LLC (“PLTC”) as design-build contractor to perform PLTP’s design and construction obligations under the PPPA on a back-to-back basis. PLTC is a limited liability company in which Fluor has a 50% membership interest. The design and construction of the Project was significantly delayed by more than two and a half years due to events outside of PLTP or PLTC’s control. The PPPA contained a provision allowing PLTP the unconditional right to terminate the PPPA if certain events delayed the design and construction of the Project by 365 days or more. The DB Contract contained a similar provision allowing PLTC to terminate the DB Contract. Because of significant Project delays, in excess of 365 days, on May 1, 2020, PLTC gave notice to PLTP of PLTC’s intent to terminate the DB Contract. Upon receiving PLTC’s notice, on June 23, 2020, PLTP exercised its unconditional right to terminate the PPPA. The State challenged PLTP’s termination of the PPPA and commenced a lawsuit in Maryland state court against PLTP alleging breach of the PPPA. This matter has now been resolved. PLTC, PLTP and the State entered into a comprehensive settlement in December, 2020. As part of the settlement, Fluor transferred its 15% interest in PLTP to the remaining partners. Fluor also sold its 50% interest in the operations & maintenance entity to the remaining partners. PLTC received an initial settlement payment of $116 million from PLTP in December 2020, and we are contractually owed an additional $150 million to be paid no later than December 2021. The lawsuit has been dismissed with prejudice, the DB Contract is officially terminated, and PLTC has received a final release from PLTP and the State. Other Matters We have made claims arising from the performance under our contracts. We recognize revenue for claims, including change orders in dispute and unapproved change orders, when it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur. We estimate the amount of revenue to be recognized on claims using the expected value method (i.e., the sum of probability-weighted amounts) or the most likely amount method, whichever offers better prediction. Factors considered in determining whether revenue associated with claims should be recognized include the following: (a) the legal basis for the claim, (b) additional costs were caused by circumstances that were unforeseen at the contract date and not the result of deficiencies in our performance, (c) claim-related costs are identifiable and considered reasonable in view of the work performed, and (d) evidence supporting the claim is objective and verifiable. Similarly, we recognize disputed back charges to suppliers or subcontractors as a reduction of cost when the same requirements have been satisfied. We periodically evaluate our positions and the amounts recognized with respect to all our claims and back charges. As of December 31, 2020 and 2019, we had recorded $216 million and $198 million, respectively, of claim revenue for costs incurred to date. Additional costs, which will increase the claim revenue balance over time, are expected to be incurred in future periods. We also had recorded disputed back charges to suppliers or subcontractors as of December 31, 2020 and 2019, none of which were material. From time to time, we enter into contracts with the U.S. government and its agencies. Government contracts are subject to audits and investigations by government representatives with respect to our compliance with various restrictions and regulations applicable to government contractors, including but not limited to the allowability of costs incurred under reimbursable contracts. In connection with performing government contracts, we maintain reserves for estimated exposures associated with these matters. Our operations are subject to and affected by federal, state and local laws and regulations regarding the protection of the environment. We maintain reserves for potential future environmental cost where such obligations are either known or considered probable, and can be reasonably estimated. We believe, based upon present information available to us, that our reserves with respect to future environmental cost are adequate and such future cost will not have a material effect on our consolidated financial position, results of operations or liquidity. In February 2020, we announced that the SEC is conducting an investigation and has requested documents and information related to projects for which we recorded charges in the second quarter of 2019. In April 2020, the Corporation received a subpoena from the U.S. Department of Justice (“DOJ”) seeking documents and information related to the second quarter 2019 charges; certain of the projects associated with those charges; and certain project accounting, financial reporting and governance matters. We are coordinating responses to the SEC and DOJ and cooperating in providing the requested documents and information, which efforts are ongoing.

Contract Assets and Liabilities

Contract Assets and Liabilities	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract Assets and Liabilities	Contract Assets and Liabilities The following summarizes information about our contract assets and liabilities: December 31, (in millions) 2020 2019 Information about contract assets: Contract assets Unbilled receivables $ 681 $ 851 Contract work in progress 287 387 Contract assets $ 968 $ 1,238 Advance billings deducted from contract assets $ 310 $ 574 Year Ended December 31, 2020 2019 Information about contract liabilities: Provision for anticipated losses on contracts included in contract liabilities $ 203 $ 371 Revenue recognized that was included in contract liabilities as of January 1 755 779 We estimate that our RUPO will be satisfied over the following periods: (in millions) December 31, 2020 Within 1 year $ 10,873 1 to 2 years 6,150 Thereafter 6,445 Total remaining unsatisfied performance obligations $ 23,468

Remaining Unsatisfied Performan

Remaining Unsatisfied Performance Obligations	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Remaining Unsatisfied Performance Obligations	Contract Assets and Liabilities The following summarizes information about our contract assets and liabilities: December 31, (in millions) 2020 2019 Information about contract assets: Contract assets Unbilled receivables $ 681 $ 851 Contract work in progress 287 387 Contract assets $ 968 $ 1,238 Advance billings deducted from contract assets $ 310 $ 574 Year Ended December 31, 2020 2019 Information about contract liabilities: Provision for anticipated losses on contracts included in contract liabilities $ 203 $ 371 Revenue recognized that was included in contract liabilities as of January 1 755 779 We estimate that our RUPO will be satisfied over the following periods: (in millions) December 31, 2020 Within 1 year $ 10,873 1 to 2 years 6,150 Thereafter 6,445 Total remaining unsatisfied performance obligations $ 23,468

Lines of Credit, Senior Notes a

Lines of Credit, Senior Notes and Other Borrowings	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Lines of Credit, Senior Notes and Other Borrowings	Lines of Credit, Senior Notes and Other Borrowings Debt consisted of the following: December 31, (in thousands) 2020 2019 Current: Other borrowings $ 25,415 $ 38,728 Long-Term: Senior Notes 2023 Notes $ 609,764 $ 557,185 2024 Notes 496,200 495,240 2028 Notes 595,134 594,502 Other borrowings 8,935 4,812 Borrowings under committed lines of credit $ — $ — Committed Line of Credit In February 2021, we entered into an amended and restated $1.65 billion credit facility which matures in February 2023. This credit facility contains customary financial covenants, including a debt-to-capitalization ratio that cannot exceed 0.65 to 1.00, a limitation on the aggregate amount of debt of the greater of $750 million or €750 million for our subsidiaries, and a minimum liquidity threshold, as defined in the amended credit facility, of $1.5 billion which may be reduced to $1.25 billion upon the repayment of debt. If this credit facility had been in place as of December 31, 2020, our financial covenants would have limited our further borrowings to approximately $934 million. The credit facility also contains provisions that will require us to provide collateral to secure this facility should we be downgraded to BB by S&P and Ba2 by Moody's, such collateral consisting broadly of our U.S. assets. Borrowings under the facility, which may be denominated in USD, EUR, GBP or CAD, bear interest at a base rate, plus an applicable borrowing margin. As of December 31, 2020, letters of credit totaling $418 million were outstanding under our predecessor lines of credit, which consisted of a $1.7 billion Revolving Loan and Letter of Credit Facility and a $1.8 billion Revolving Loan and Letter of Credit Facility. There were no borrowings outstanding under these facilities as of December 31, 2020. These credit facilities also contained customary financial and restrictive covenants, including a debt-to-capitalization ratio that could not exceed 0.6 to 1.0. Senior Notes In August 2018, we issued $600 million of 4.250% Senior Notes due in September 2028 ("2028 Notes") and received proceeds of $595 million. Interest on the 2028 Notes is payable semi-annually in March and September. Prior to June 2028, we may redeem the 2028 Notes at a redemption price equal to 100% of the principal amount, plus a “make whole” premium described in the indenture. After June 2028, the 2028 Notes can be redeemed at par plus accrued interest. In March 2016, we issued €500 million of 1.750% Senior Notes due in March 2023 ("2023 Notes") and received proceeds of €497 million. Interest on the 2023 Notes is payable annually in March. Prior to December 2022, we may redeem the 2023 Notes at a redemption price equal to 100% of the principal amount, plus a "make whole" premium described in the indenture. After December 2022, the 2023 Notes can be redeemed at par plus accrued interest. Additionally, we may redeem the 2023 Notes at par plus accrued interest if certain changes in U.S. tax laws occur. In November 2014, we issued $500 million of 3.5% Senior Notes due in December 2024 ("2024 Notes") and received proceeds of $491 million. Interest on the 2024 Notes is payable semi-annually in June and December. Prior to September 2024, we may redeem the 2024 Notes at a redemption price equal to 100% of the principal amount, plus a "make whole" premium described in the indenture. After September 2024, the 2024 Notes can be redeemed at par plus accrued interest. For all of the Senior Notes, a change of control (as defined by the terms of the respective indentures) could require the company to repay them at 101% of the principal amount, plus accrued interest. We may incur additional indebtedness if we are in compliance with certain restrictive covenants, including restrictions on liens and restrictions on sale and leaseback transactions. Other Borrowings and Letters of Credit Other borrowings of $34 million and $44 million as of December 31, 2020 and 2019, respectively, primarily represent bank loans and other financing arrangements associated with Stork. Letters of credit are provided in the ordinary course of business primarily to indemnify our clients if we fail to perform our obligations under our contracts. Surety bonds may be used as an alternative to letters of credit. As of December 31, 2020, letters of credit totaling $862 million were outstanding under uncommitted lines of credit.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The fair value hierarchy prioritizes the use of inputs used in valuation techniques into the following three levels: • Level 1 — quoted prices in active markets for identical assets and liabilities • Level 2 — inputs other than quoted prices in active markets for identical assets and liabilities that are observable, either directly or indirectly • Level 3 — unobservable inputs We perform procedures to verify the reasonableness of pricing information received from third parties for significant assets and liabilities classified as Level 2. The following table delineates assets and liabilities that are measured at fair value on a recurring basis: December 31, 2020 December 31, 2019 (in thousands) Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Assets: Deferred compensation trusts (1) $ 9,626 $ 9,626 $ — $ — $ 7,719 $ 7,719 $ — $ — Derivative assets (2) Foreign currency 22,667 — 22,667 — 7,167 — 7,167 — Commodity 806 — 806 — 46 — 46 — Liabilities: Derivative liabilities (2) Foreign currency $ 2,571 $ — $ 2,571 $ — $ 6,561 $ — $ 6,561 $ — Commodity 5,059 — 5,059 — 1,247 — 1,247 — (1) Consists of registered money market funds and an equity index fund. These investments, which are trading securities, represent the net asset value as of the close of business at the end of the period based on the last trade or official close of an active market or exchange. (2) Foreign currency and commodity derivatives are estimated using pricing models with market-based inputs, which take into account the present value of estimated future cash flows. During 2018, proceeds from sales and maturities of available-for-sale securities were $175 million. There were no sales or maturities of available-for-sale securities during 2020 and 2019. We have measured assets and liabilities held for sale and certain other impaired assets at fair value on a nonrecurring basis. The following summarizes information about our financial instruments that are not required to be measured at fair value: December 31, 2020 December 31, 2019 (in thousands) Fair Value Hierarchy Carrying Value Fair Value Carrying Value Fair Value Assets: Cash (1) Level 1 $ 1,180,024 $ 1,180,024 $ 1,014,138 $ 1,014,138 Cash equivalents (2) Level 2 1,018,757 1,018,757 983,061 983,061 Marketable securities, current (2) Level 2 23,345 23,345 7,262 7,262 Notes receivable, including noncurrent portion (3) Level 3 38,295 38,295 28,117 28,117 Liabilities: 2023 Senior Notes (4) Level 2 $ 609,764 $ 578,554 $ 557,185 $ 562,399 2024 Senior Notes (4) Level 2 496,200 494,045 495,240 510,145 2028 Senior Notes (4) Level 2 595,134 599,220 594,502 609,918 Other borrowings, including noncurrent portion (5) Level 2 34,350 34,350 43,539 43,539 _______________________________________________________________________________ (1) Cash consists of bank deposits. Carrying amounts approximate fair value. (2) The carrying amounts of these time deposits approximate fair value because of the short-term maturity of these instruments. Amortized cost is not materially different from the fair value. (3) Notes receivable are carried at net realizable value which approximates fair value. Factors considered in determining the fair value include the credit worthiness of the borrower, current interest rates, the term of the note and any collateral pledged as security. Notes receivable are periodically assessed for impairment. (4) The fair value of the Senior Notes was estimated based on quoted market prices and Level 2 inputs. (5) Other borrowings primarily represent bank loans and other financing arrangements which primarily mature within one year. The carrying amount of borrowings under these arrangements approximates fair value because of the short-term maturity.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets As discussed above, we performed interim impairment testing of our goodwill and intangible assets in the first quarter of 2020 due to the impacts of COVID-19 and the decline in oil prices. We recognized impairment expense of $169 million on goodwill associated with Diversified Services and $27 million on intangible customer relationships associated with Stork. No additional impairment on goodwill or intangible assets was recognized during the remainder of 2020. During 2019, we recognized impairment expense of $34 million on intangible customer relationships associated with Stork. The following table provides a summary of each major intangible asset class: December 31, 2020 December 31, 2019 Weighted (in thousands) Gross Carrying Amount Accumulated Amortization Net Book Value Gross Carrying Amount Accumulated Amortization Net Book Value Customer relationships (finite-lived) $ — $ — $ — $ 31,894 $ (451) $ 31,443 8 Trade names (finite-lived) 9,169 (4,844) 4,325 8,388 (3,460) 4,928 13 Trade names (indefinite-lived) 53,411 — 53,411 49,789 — 49,789 — In-process research and development (indefinite-lived) 16,900 — 16,900 16,900 — 16,900 — Other (finite-lived) 10,742 (7,805) 2,937 10,399 (6,919) 3,480 10 Total intangible assets (1) $ 90,222 $ (12,649) $ 77,573 $ 117,370 $ (10,830) $ 106,540

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment is as follows: December 31, (cost in thousands) 2020 2019 Land $ 52,424 $ 50,129 Buildings 299,560 279,901 Building and leasehold improvements 153,333 155,917 Machinery and equipment 927,075 875,581 Furniture and fixtures 144,667 133,573 Construction in progress 21,250 63,814 1,598,309 1,558,915 Less accumulated depreciation (1,037,225) (964,089) Net property, plant and equipment $ 561,084 $ 594,826

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation Equity Awards Stock-based compensation, which is generally recognized on a straight-line basis, totaled $22 million, $36 million and $43 million during 2020, 2019 and 2018, respectively. We recognized tax benefits of $5 million, $8 million and $10 million related to stock-based compensation during 2020, 2019 and 2018, respectively. The following table summarizes RSU, restricted stock and stock option activity: RSU or Stock Options Number Weighted Number Weighted Outstanding as of December 31, 2017 933,464 $51.85 5,069,956 $60.08 Granted 603,111 57.88 33,615 58.15 Forfeited or expired (38,365) 54.07 (352,624) 64.64 Vested/exercised (513,078) 51.58 (161,562) 44.92 Outstanding as of December 31, 2018 985,132 $53.78 4,589,385 $60.25 Granted 1,356,303 32.68 1,192,108 22.47 Forfeited or expired (173,604) 39.57 (351,885) 60.56 Vested/exercised (507,520) 47.72 (48,131) 30.46 Outstanding as of December 31, 2019 1,660,311 $39.88 5,381,477 $52.13 Granted 1,355,975 10.30 975,290 11.06 Forfeited or expired (114,352) 33.74 (603,835) 59.46 Vested/exercised (643,340) 42.23 — — Outstanding as of December 31, 2020 2,258,594 $21.76 5,752,932 $44.40 Options exercisable as of December 31, 2020 3,784,647 $58.80 Remaining unvested options outstanding and expected to vest 1,948,602 $16.72 Our stock-based plans provide that RSUs and restricted stock may not be sold or transferred until service-based restrictions have lapsed and any performance objectives have been attained. Generally, upon termination of employment, RSUs and restricted stock which have not vested are forfeited. RSUs granted to executives in 2020, 2019 and 2018 generally vest ratably over 3 years. RSUs granted to one executive in 2020 vest over 5 years. RSUs granted to directors in 2020, 2019 and 2018 vested upon grant. RSUs awarded to directors in 2019 and 2018 (as well as one RSU award to a director in 2020) are subject to a post-vest holding period of 3 years. During 2020, 2019 and 2018, compensation expense related to RSUs of $17 million, $32 million and $30 million, respectively, was included in corporate G&A. The fair value of RSUs that vested during 2020, 2019 and 2018 was $5 million, $14 million and $28 million, respectively. The balance of unamortized RSU expense as of December 31, 2020 was $10 million, which is expected to be recognized over a weighted-average period of 1.4 years. The exercise price of options represents the closing price of our common stock on the date of grant. The options granted in 2020, 2019 and 2018 generally vest over 3 years and expire 10 years after the grant date. Options granted to one executive in 2020 vest over 5 years. Stock option expense during 2020, 2019 and 2018 included in corporate G&A totaled $5 million, $4 million and $4 million, respectively. The aggregate intrinsic value of stock options exercised during 2019 and 2018 was $0.3 million and $2 million, respectively. There were no stock option exercises during 2020. The balance of unamortized stock option expense as of December 31, 2020 was $6 million, which is expected to be recognized over a weighted-average period of 2.2 years. The grant date fair value of options and other significant assumptions follow: January 1 - November 30, 2020 December 31, 2020 January 1 - September 30, 2019 October 1 - December 31, 2019 2018 Weighted average grant date fair value $4.59 $9.05 $7.99 $6.93 $14.87 Expected life of options (in years) 4.6 7.2 5.6 5.4 5.3 Risk-free interest rate 0.4 % 0.5 % 2.6 % 1.7 % 2.7 % Expected volatility 64.9 % 60.8 % 33.3 % 46.6 % 28.2 % Expected annual dividend per share $0.00 $0.00 $0.84 $0.40 $0.84 The computation of the expected volatility assumption used in the Black-Scholes calculations is based on a 50/50 blend of historical and implied volatility. Information related to options outstanding as of December 31, 2020 follows: Options Outstanding Options Exercisable Range of Exercise Prices Number Weighted Weighted Number Weighted Weighted $8.81 - $29.50 2,088,027 9.2 $ 17.27 130,947 8.4 $ 29.03 $46.07 - $62.50 3,054,457 4.4 56.48 3,043,252 4.4 56.47 $70.76 - $79.19 610,448 2.3 76.77 610,448 2.3 76.77 5,752,932 5.9 $ 44.40 3,784,647 4.2 $ 58.80 As of December 31, 2020, options outstanding had an aggregate intrinsic value of $5 million, and there was no intrinsic value for options exercisable. During 2020, 2019 and 2018, performance-based award units totaling 1,156,365; 350,532; and 206,598, respectively, were awarded to Section 16 officers. These awards generally vest after a period of 3 years and contain annual performance conditions for each of the 3 years of the vesting period. Under GAAP, performance-based awards are not deemed granted until the performance targets have been established. The performance targets for each year are generally established in the first quarter. Accordingly, only one-third of the units awarded in any given year are deemed to be granted each year of the 3 year vesting periods. During 2020, the following units were granted: Performance-based Award Units Granted in 2020 Weighted 2020 Performance Award Plan 385,455 $9.05 2019 Performance Award Plan 116,844 $9.77 2018 Performance Award Plan 68,866 $10.75 For awards granted under the 2020, 2019 and 2018 performance award plans, the number of units are adjusted at the end of each performance period based on achievement of certain performance targets and market conditions, as defined in the award agreements. Compensation expense of $1 million and $9 million related to performance-based award units was included in corporate G&A in 2019 and 2018, respectively. Compensation expense related to performance-based award units in 2020 was immaterial. The balance of unamortized compensation expense associated with performance-based award units as of December 31, 2020 was less than $0.1 million, which is expected to be recognized over a weighted-average period of 0.2 years. Liability Awards We grant SGI awards in the form of stock units, determined by dividing the target amount by the closing price of our common stock at the grant date. Each stock unit represents the right to receive cash equal to the value of one share upon settlement. SGI awards granted to executives vest and become payable at a rate of one-third of the total award each year. Compensation expense of $25 million, $6 million and $6 million related to SGI awards was included in corporate G&A in 2020, 2019 and 2018, respectively. Liabilities associated with SGI awards were $29 million and $8 million as of December 31, 2020 and 2019, respectively. During 2020, 2019 and 2018, performance-based awards were awarded to non-Section 16 executives and will be settled in cash. Compensation expense of $3 million, $8 million and $10 million related to these performance-based awards was included in corporate G&A in 2020, 2019 and 2018, respectively. Liabilities associated with these awards were $16 million and $14 million as of December 31, 2020 and 2019, respectively.

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans DC Plans Domestic and international DC plans are available to eligible salaried and craft employees. Company contributions to DC plans are based on an employee's eligible compensation and participation rate. We recognized expense of $130 million, $115 million and $150 million associated with contributions to our DC plans during 2020, 2019 and 2018, respectively. DB Plans Certain DB plans are available to eligible international salaried employees. Contributions to DB plans are at least the minimum amounts required by applicable regulations. Benefit payments under these plans are generally based upon length of service and/or qualifying compensation. Net periodic pension expense for our DB Plans included the following components: Year Ended December 31, (in thousands) 2020 2019 2018 Service cost $ 18,129 $ 15,750 $ 17,999 Interest cost 9,899 19,617 21,820 Expected return on assets (26,304) (32,645) (38,064) Amortization of prior service credit (903) (886) (935) Recognized net actuarial loss 5,806 10,303 8,368 (Gain) loss on settlement (406) 137,898 21,900 Net periodic pension expense $ 6,221 $ 150,037 $ 31,088 The service cost component of net periodic pension expense is presented in “Cost of revenue” and the other components of net periodic pension expense are presented in “Corporate G&A” and "(Gain) loss on pension settlement". UK Plan In 2018, we executed a buy-in policy contract with an insurance company to fully insure the benefits of the DB plan in the United Kingdom ("UK plan"). The UK plan was terminated in December 2019 and moved from "buy-in" to "buy-out" status, at which point the remaining benefit obligations were transferred to the insurer and we were relieved of any further obligation. During 2019, we recorded a loss on pension settlement of $138 million, which consisted primarily of unrecognized actuarial losses included in AOCI. The settlement of the plan did not impact our cash position. During 2018, lump-sum distributions to participants of the UK plan exceeded the sum of the service and interest cost components of net periodic pension cost. As a result, we recorded a loss on partial pension settlement of $22 million. DB Plan Assumptions The ranges of assumptions indicated below cover DB plans in the Netherlands, Germany, the Philippines and the UK (2018 only) and are based on the economic environment in each host country at the end of each reporting period. The discount rates for the DB plans were determined primarily based on a hypothetical yield curve developed from the yields on high quality corporate and government bonds with durations consistent with the pension obligations in those countries. The expected long-term rate of return on asset assumptions utilizing historical returns, correlations and investment manager forecasts are established for all relevant asset classes including international equities and government, corporate and other debt securities. December 31, 2020 2019 2018 For determining projected benefit obligation ("PBO") at year-end: Discount rates 0.80-3.50% 1.20-4.75% 1.80-7.25% Rates of increase in compensation levels 2.25-6.00% 2.25-6.00% 2.25-7.00% For determining net periodic cost for the year: Discount rates 1.20-4.75% 1.80-7.25% 1.90-5.50% Rates of increase in compensation levels 2.25-6.00% 2.25-7.00% 2.25-7.00% Expected long-term rates of return on assets 1.20-5.60% 1.80-8.20% 1.90-7.00% We evaluate the funded status of each of our DB plans using the above assumptions and determine the appropriate funding level in light of applicable regulatory requirements, tax deductibility, reporting considerations and other factors. The funding status of the plans is sensitive to changes in long-term interest rates and returns on plan assets, and funding obligations could increase substantially if interest rates fall dramatically or returns on plan assets are below expectations. Assuming no changes in current assumptions, we expect to contribute up to $12 million to our DB plans in 2021, which is expected to be in excess of the minimum funding required. If the discount rates were reduced by 25 basis points, plan liabilities would increase by approximately $57 million. DB Plan Assets The following table sets forth the target and actual allocations of plan assets: December 31, 2020 Target Allocation 2020 2019 Asset category: Debt securities 55% - 65% 63 % 60 % Equity securities 25% - 35% 28 % 31 % Other 0% - 10% 9 % 9 % Total 100 % 100 % Our investment strategy is to maintain asset allocations that appropriately manage risk within the context of seeking adequate returns. Investment allocations are determined by each plan's governing body. Asset allocations may be affected by local regulations. Long-term allocation guidelines are established with a target range allocation for each asset class. Short-term deviations from these allocations may exist from time to time for tactical investment or strategic implementation purposes. Investments in debt securities are used to provide stable investment returns while protecting the funding status of the plans. Investments in equity securities are utilized to generate long-term capital appreciation to mitigate the effects of increases in benefit obligations resulting from inflation, longer life expectancy and salary growth. While most of our plans may invest in the company's securities, there are no such direct investments at the present time. Plan assets included investments in common or collective trusts ("CCTs"), which offer efficient access to diversified investments across various asset categories. The estimated fair value of the investments in the CCTs represents the net asset value of the shares or units of such funds as determined by the issuer. A redemption notice period of no more than 30 days is required for the plans to redeem certain investments in CCTs. At the present time, there are no other restrictions on how the plans may redeem their investments. Debt securities are comprised of corporate bonds, government securities and CCTs with underlying investments in corporate bonds, government and asset backed securities and interest rate swaps. Corporate bonds primarily consist of investment-grade rated bonds and notes, of which no significant concentration exists in any one rating category or industry. Government securities include international government bonds, some of which are inflation-indexed. Corporate bonds and government securities are valued based on pricing models, which are determined from a compilation of primarily observable market information, broker quotes in non-active markets or similar assets. Equity securities span various industries and are comprised of common stocks of international companies as well as CCTs with underlying investments in common and preferred stocks. Publicly traded corporate equity securities are valued based on the closing price of an active market or exchange. Inactive securities are valued at the last reported bid price. As of both December 31, 2020 and 2019, direct investments in equity securities were concentrated in international securities. Other plan assets include guaranteed investment contracts and CCTs. Guaranteed investment contracts are insurance contracts that guarantee a principal repayment and a stated rate of interest. The estimated fair value of these insurance contracts, which are Level 3 assets, represents the discounted value of guaranteed benefit payments. CCTs hold underlying investments primarily in commodities. The following table delineates the fair value of the plan assets and liabilities of our DB Plans: December 31, 2020 December 31, 2019 (in thousands) Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Assets: Equity securities: Common stock $ 5,252 $ 5,252 $ — $ — $ 5,346 $ 5,346 $ — $ — CCTs 230,135 — 230,135 — 215,904 — 215,904 — Debt securities: Corporate bonds 532 — 532 — 493 — 493 — Government securities 12,036 — 12,036 — 12,962 — 12,962 — CCTs 507,691 — 507,691 — 412,416 — 412,416 — Other: Guaranteed investment contracts 20,588 — — 20,588 19,650 — — 19,650 CCTs 51,679 — 51,679 — 43,302 — 43,302 — Plan assets measured at fair value, net $ 827,913 $ 5,252 $ 802,073 $ 20,588 $ 710,073 $ 5,346 $ 685,077 $ 19,650 Plan assets not measured at fair value, net 1,507 590 Total plan assets, net $ 829,420 $ 710,663 The following table presents information about Level 3 fair value measurements: (in thousands) 2020 2019 Balance at beginning of year $ 19,650 $ 374,724 Actual return on plan assets: Assets still held at reporting date 2,092 1,609 Assets sold during the period — 49,524 Purchases 343 187 Settlements (1,497) (406,394) Balance at end of year $ 20,588 $ 19,650 The following table presents expected future benefit payments related to our DB Plans: Year Ended December 31, (in thousands) 2021 $ 21,387 2022 21,461 2023 21,677 2024 22,347 2025 23,065 2026 — 2030 125,302 The following table sets forth the change in PBO, plan assets and funded status of the plans: December 31, (in thousands) 2020 2019 Change in PBO: Benefit obligation at beginning of year $ 748,784 $ 1,020,633 Service cost 18,129 15,750 Interest cost 9,899 19,617 Employee contributions 2,860 3,382 Currency translation 72,178 (2,794) Actuarial (gain) loss (1) 58,258 117,549 Benefits paid (17,224) (27,362) Divestitures — (1,669) Curtailments (6,574) — Settlements (16,475) (396,322) PBO at end of year 869,835 748,784 Change in plan assets: Plan assets at beginning of year 710,663 964,289 Actual return on plan assets 55,819 153,033 Company contributions 24,752 14,591 Employee contributions 2,860 3,382 Currency translation 69,025 (948) Benefits paid (17,224) (27,362) Settlements (16,475) (396,322) Plan assets at end of year 829,420 710,663 Funded status — (Under)/overfunded $ (40,415) $ (38,121) Amounts recognized in the Consolidated Balance Sheet: Pension assets included in other assets $ — $ 1,349 Pension liabilities included in other accrued liabilities (647) (2,041) Pension liabilities included in noncurrent liabilities (39,768) (37,429) AOCI (pre-tax) $ 161,534 $ 130,619 Plans with PBO in excess of plan assets: PBO $ 869,835 $ 78,961 Plan assets 829,420 39,491 Plans with ABO in excess of plan assets: ABO $ 45,757 $ 73,865 Plan assets 20,588 39,491 (1) Actuarial losses are primarily due to assumption changes. The total ABO for all DB Plans as of December 31, 2020 and 2019 was $793 million and $681 million, respectively. Multiemployer Pension Plans In addition to our DB plans discussed above, we participate in multiemployer pension plans for unionized construction and maintenance craft employees. Company contributions are based on the hours worked by employees covered under various collective bargaining agreements and totaled $38 million, $32 million and $30 million during 2020, 2019 and 2018, respectively. We are not aware of any significant future obligations or funding requirements related to these plans other than the ongoing contributions that are paid as hours are worked by plan participants. None of these multiemployer pension plans are individually significant to us. The preceding information does not include amounts related to benefit plans applicable to employees associated with certain contracts with the U.S. Department of Energy because we are not responsible for the current or future funding of these plans.

Other Noncurrent Liabilities

Other Noncurrent Liabilities	12 Months Ended
	Dec. 31, 2020
Other Liabilities, Noncurrent [Abstract]
Other Noncurrent Liabilities	Other Noncurrent LiabilitiesWe have deferred compensation plans and other retirement arrangements for executives which generally provide for payments upon retirement, death or termination of employment. As of December 31, 2020 and 2019, the obligations related to these plans totaled $329 million and $338 million, respectively, within noncurrent liabilities. To fund these obligations, we have established non-qualified trusts, which are included in noncurrent assets. These trusts hold life insurance policies and marketable securities. These trusts were valued at $350 million and $341 million as of December 31, 2020 and 2019, respectively. Periodic changes in the value of these trust investments, most of which are unrealized, are recognized in earnings, and serve to mitigate changes to the obligations which are also reflected in earnings.We maintain appropriate levels of insurance for business risks, including workers compensation and general liability. Insurance coverages contain various retention amounts for which we provide accruals based on the aggregate of the liability for reported claims and an actuarially determined estimated liability for claims incurred but not reported. As of December 31, 2020 and 2019, insurance liabilities of $70 million and $80 million, respectively, were included in noncurrent liabilities.

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Leases, Operating [Abstract]
Leases	Leases The following summarizes lease expense: Year Ended Year Ended December 31, 2019 Lease Expense / (Sublease Income) Continuing Operations Discontinued Operations Continuing Operations Discontinued Operations (in thousands) Operating lease cost $ 83,938 $ 792 $ 90,591 $ 809 Finance lease cost Amortization of right-of-use assets 651 676 1,394 27 Interest on lease liabilities 23 117 65 2 Variable lease cost (1) 7,415 — 19,231 — Short-term lease cost 92,161 24,900 119,737 43,807 Sublease income (6,797) (10,278) (8,905) (25,832) Total lease expense $ 177,391 $ 16,207 $ 222,113 $ 18,813 (1) Primarily relates to rent escalation due to cost of living indexation and payments for property taxes, insurance or common area maintenance based on actual assessments. Information related to our right-of use assets and lease liabilities follows: December 31, 2020 December 31, 2019 Lease Assets / Liabilities Balance Sheet Classification Cont Ops Disc Ops Cont Ops Disc Ops (in thousands) Right-of-use assets Operating lease assets Other assets $ 215,134 $ — $ 259,169 $ — Operating lease assets Current assets held for sale — 2,434 13,123 3,259 Finance lease assets Other assets 400 — 937 — Finance lease assets Current assets held for sale — 9,069 — 181 Total right-of-use assets $ 215,534 $ 11,503 $ 273,229 $ 3,440 Lease liabilities Operating lease liabilities, current Other accrued liabilities $ 62,180 $ — $ 65,961 $ — Operating lease liabilities, noncurrent Noncurrent liabilities 176,776 — 219,146 — Operating lease liabilities Current liabilities held for sale — 2,434 13,228 3,180 Finance lease liabilities, current Other accrued liabilities 114 — 906 — Finance lease liabilities, noncurrent Noncurrent liabilities — — 8 — Finance lease liabilities Current liabilities held for sale — 8,327 — 191 Total lease liabilities $ 239,070 $ 10,761 $ 299,249 $ 3,371 Supplemental information related to our leases follows: Year Ended Year Ended Cont Ops Disc Ops Cont Ops Disc Ops (in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 89,649 $ 780 $ 91,308 $ 787 Operating cash flows from finance leases 23 117 65 3 Financing cash flows from finance leases 761 1,365 1,547 25 Right-of-use assets obtained in exchange for new operating lease liabilities 20,471 — 96,984 546 Right-of-use assets obtained in exchange for new finance lease liabilities — 8,663 — 222 Weighted-average remaining lease term - operating leases 6.1 years 4.3 years 6.5 years 4.8 years Weighted-average remaining lease term - finance leases 2.1 years 5.0 years 2.2 years 3.5 years Weighted-average discount rate - operating leases 3.04 % 3.47 % 3.34 % 3.50 % Weighted-average discount rate - finance leases 3.39 % 2.72 % 3.38 % 2.64 % The remaining lease payments under our operating and finance leases follows: Cont Ops Disc Ops Year Ended December 31, Operating Finance Operating Finance (in thousands) 2021 $ 68,649 $ 8 $ 654 $ 2,927 2022 55,736 55 609 2,906 2023 41,029 62 554 1,436 2024 28,211 — 482 821 2025 20,275 — 324 612 Thereafter 47,358 — — — Total lease payments $ 261,258 $ 125 $ 2,623 $ 8,702 Less: Interest (22,302) (11) (189) (375) Present value of lease liabilities $ 238,956 $ 114 $ 2,434 $ 8,327 During 2018, net rental expense amounted to $360 million (including $2 million from discontinued operations).
Leases	Leases The following summarizes lease expense: Year Ended Year Ended December 31, 2019 Lease Expense / (Sublease Income) Continuing Operations Discontinued Operations Continuing Operations Discontinued Operations (in thousands) Operating lease cost $ 83,938 $ 792 $ 90,591 $ 809 Finance lease cost Amortization of right-of-use assets 651 676 1,394 27 Interest on lease liabilities 23 117 65 2 Variable lease cost (1) 7,415 — 19,231 — Short-term lease cost 92,161 24,900 119,737 43,807 Sublease income (6,797) (10,278) (8,905) (25,832) Total lease expense $ 177,391 $ 16,207 $ 222,113 $ 18,813 (1) Primarily relates to rent escalation due to cost of living indexation and payments for property taxes, insurance or common area maintenance based on actual assessments. Information related to our right-of use assets and lease liabilities follows: December 31, 2020 December 31, 2019 Lease Assets / Liabilities Balance Sheet Classification Cont Ops Disc Ops Cont Ops Disc Ops (in thousands) Right-of-use assets Operating lease assets Other assets $ 215,134 $ — $ 259,169 $ — Operating lease assets Current assets held for sale — 2,434 13,123 3,259 Finance lease assets Other assets 400 — 937 — Finance lease assets Current assets held for sale — 9,069 — 181 Total right-of-use assets $ 215,534 $ 11,503 $ 273,229 $ 3,440 Lease liabilities Operating lease liabilities, current Other accrued liabilities $ 62,180 $ — $ 65,961 $ — Operating lease liabilities, noncurrent Noncurrent liabilities 176,776 — 219,146 — Operating lease liabilities Current liabilities held for sale — 2,434 13,228 3,180 Finance lease liabilities, current Other accrued liabilities 114 — 906 — Finance lease liabilities, noncurrent Noncurrent liabilities — — 8 — Finance lease liabilities Current liabilities held for sale — 8,327 — 191 Total lease liabilities $ 239,070 $ 10,761 $ 299,249 $ 3,371 Supplemental information related to our leases follows: Year Ended Year Ended Cont Ops Disc Ops Cont Ops Disc Ops (in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 89,649 $ 780 $ 91,308 $ 787 Operating cash flows from finance leases 23 117 65 3 Financing cash flows from finance leases 761 1,365 1,547 25 Right-of-use assets obtained in exchange for new operating lease liabilities 20,471 — 96,984 546 Right-of-use assets obtained in exchange for new finance lease liabilities — 8,663 — 222 Weighted-average remaining lease term - operating leases 6.1 years 4.3 years 6.5 years 4.8 years Weighted-average remaining lease term - finance leases 2.1 years 5.0 years 2.2 years 3.5 years Weighted-average discount rate - operating leases 3.04 % 3.47 % 3.34 % 3.50 % Weighted-average discount rate - finance leases 3.39 % 2.72 % 3.38 % 2.64 % The remaining lease payments under our operating and finance leases follows: Cont Ops Disc Ops Year Ended December 31, Operating Finance Operating Finance (in thousands) 2021 $ 68,649 $ 8 $ 654 $ 2,927 2022 55,736 55 609 2,906 2023 41,029 62 554 1,436 2024 28,211 — 482 821 2025 20,275 — 324 612 Thereafter 47,358 — — — Total lease payments $ 261,258 $ 125 $ 2,623 $ 8,702 Less: Interest (22,302) (11) (189) (375) Present value of lease liabilities $ 238,956 $ 114 $ 2,434 $ 8,327 During 2018, net rental expense amounted to $360 million (including $2 million from discontinued operations).

Derivatives and Hedging

Derivatives and Hedging	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging	Derivatives and Hedging Derivatives Designated as Hedges As of December 31, 2020, we had total gross notional amounts of $749 million of foreign currency contracts outstanding (primarily related to the Canadian Dollar, Chinese Yuan, British Pound, Euro, Indian Rupee and Philippine Peso) that were designated as hedges. The foreign currency contracts are of varying duration, none of which extend beyond December 2024. There were no commodity contracts outstanding that were designated as hedges as of December 31, 2020. The fair values of derivatives designated as hedging instruments follows: Asset Derivatives Liability Derivatives (in thousands) Balance Sheet December 31, 2020 December 31, 2019 Balance Sheet December 31, 2020 December 31, 2019 Foreign currency contracts Other current assets $ 20,004 $ 2,871 Other accrued liabilities $ 4 $ 1,585 Commodity contracts Other current assets — 10 Other accrued liabilities — — Foreign currency contracts Other assets 2,184 3,757 Noncurrent liabilities 25 4,747 Total $ 22,188 $ 6,638 $ 29 $ 6,332 The after-tax amount of gain (loss) recognized in OCI and reclassified from AOCI into earnings associated with derivative instruments designated as cash flow hedges follows: After-Tax Amount of Gain After-Tax Amount of Gain Cash Flow Hedges (in thousands) 2020 2019 2018 Location of Gain (Loss) 2020 2019 2018 Foreign currency contracts $ 19,608 $ 1,043 $ (5,207) Cost of revenue $ 2,382 $ (1,041) $ (4,432) Commodity contracts (107) 460 — Cost of revenue (100) 453 — Interest rate contracts — — — Interest expense (1,678) (1,049) (1,049) Total $ 19,501 $ 1,503 $ (5,207) $ 604 $ (1,637) $ (5,481) Derivatives Not Designated as Hedges As of December 31, 2020, we also had total gross notional amounts of $228 million of foreign currency contracts and $28 million of commodity contracts outstanding that were not designated as hedges. The foreign currency contracts primarily

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) The components of OCI follow: Year Ended December 31, 2020 2019 2018 (in thousands) Before-Tax Tax Net-of-Tax Before-Tax Tax Net-of-Tax Before-Tax Tax Net-of-Tax OCI: Foreign currency translation adjustments $ (17,127) $ — $ (17,127) $ 101,096 $ (35,596) $ 65,500 $ (116,775) $ 16,214 $ (100,561) Ownership share of equity method investees' OCI (21,837) 3,309 (18,528) (15,630) 3,846 (11,784) 12,118 (3,176) 8,942 DB plan adjustments (19,392) — (19,392) 150,427 (44,975) 105,452 (59,920) 7,329 (52,591) Unrealized gain (loss) on hedges 23,531 (4,634) 18,897 4,734 (1,594) 3,140 1,490 (1,216) 274 Unrealized gain (loss) on available-for-sale securities — — — — — — 1,134 (425) 709 Total OCI (34,825) (1,325) (36,150) 240,627 (78,319) 162,308 (161,953) 18,726 (143,227) Less: OCI attributable to NCI 883 — 883 (1,350) — (1,350) (2,239) — (2,239) OCI attributable to Fluor Corporation $ (35,708) $ (1,325) $ (37,033) $ 241,977 $ (78,319) $ 163,658 $ (159,714) $ 18,726 $ (140,988) The changes in AOCI balances follow: (in thousands) Foreign Ownership DB Unrealized AOCI, Net Attributable to Fluor Corporation: Balance as of December 31, 2019 $ (242,950) $ (35,456) $ (99,197) $ (2,270) $ (379,873) OCI before reclassifications (18,010) (19,076) (22,921) 19,501 (40,506) Amounts reclassified from AOCI — 548 3,529 (604) 3,473 Net OCI (18,010) (18,528) (19,392) 18,897 (37,033) Balance as of December 31, 2020 $ (260,960) $ (53,984) $ (118,589) $ 16,627 $ (416,906) Attributable to NCI: Balance as of December 31, 2019 $ (5,051) $ — $ — $ — $ (5,051) OCI before reclassifications 883 — — — 883 Amount reclassified from AOCI — — — — — Net OCI 883 — — — 883 Balance as of December 31, 2020 $ (4,168) $ — $ — $ — $ (4,168) (in thousands) Foreign Ownership DB Unrealized Gain (Loss) on Hedges AOCI, Net Attributable to Fluor Corporation: Balance as of December 31, 2018 $ (309,800) $ (23,672) $ (204,649) $ (5,410) $ (543,531) OCI before reclassifications 19,957 (12,304) 4,006 1,503 13,162 Amounts reclassified from AOCI 46,893 520 101,446 1,637 150,496 Net OCI 66,850 (11,784) 105,452 3,140 163,658 Balance as of December 31, 2019 $ (242,950) $ (35,456) $ (99,197) $ (2,270) $ (379,873) Attributable to NCI: Balance as of December 31, 2018 $ (3,701) $ — $ — $ — $ (3,701) OCI before reclassifications (1,350) — — — (1,350) Amount reclassified from AOCI — — — — — Net OCI (1,350) — — — (1,350) Balance as of December 31, 2019 $ (5,051) $ — $ — $ — $ (5,051) (in thousands) Foreign Ownership DB Unrealized Unrealized AOCI, Net Attributable to Fluor Corporation: Balance as of December 31, 2017 $ (211,478) $ (32,614) $ (152,058) $ (5,684) $ (709) $ (402,543) OCI before reclassifications (98,322) 7,986 (77,209) (5,207) — (172,752) Amounts reclassified from AOCI — 956 24,618 5,481 709 31,764 Net OCI (98,322) 8,942 (52,591) 274 709 (140,988) Balance as of December 31, 2018 $ (309,800) $ (23,672) $ (204,649) $ (5,410) $ — $ (543,531) Attributable to NCI: Balance as of December 31, 2017 $ (1,462) $ — $ — $ — $ — $ (1,462) OCI before reclassifications (2,239) — — — — (2,239) Amount reclassified from AOCI — — — — — — Net OCI (2,239) — — — — (2,239) Balance as of December 31, 2018 $ (3,701) $ — $ — $ — $ — $ (3,701) The reclassifications out of AOCI follow: Location in Consolidated Year Ended December 31, (in thousands) 2020 2019 2018 Component of AOCI: Foreign currency translation adjustment Impairment, restructuring & other exit costs $ — $ (84,286) $ — Income tax benefit Income tax expense (benefit) — 37,393 — Net of tax $ — $ (46,893) $ — Ownership share of equity method investees' OCI Cost of revenue $ (730) $ (695) $ (1,297) Income tax benefit Income tax expense (benefit) 182 175 341 Net of tax $ (548) $ (520) $ (956) DB plan adjustments Various accounts (1) $ (3,529) $ (146,579) $ (28,730) Income tax benefit Income tax expense (benefit) — 45,133 4,112 Net of tax $ (3,529) $ (101,446) $ (24,618) Unrealized gain (loss) on hedges: Commodity and foreign currency contracts Various accounts (2) $ 1,837 $ (1,370) $ (6,540) Interest rate contracts Interest expense (1,678) (1,678) (1,678) Income tax benefit Income tax expense (benefit) 445 1,411 2,737 Net of tax: $ 604 $ (1,637) $ (5,481) Unrealized loss on available-for-sale securities Corporate G&A $ — $ — $ (1,134) Income tax benefit Income tax expense (benefit) — — 425 Net of tax $ — $ — $ (709) (1) DB plan adjustments were reclassified to "Corporate G&A" and "Loss on pension settlement". (2) Gains and losses on commodity and foreign currency derivatives were reclassified to "Cost of revenue" and "Corporate G&A".

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations We expect to complete the sale of the AMECO equipment business, which is reported in Disc Ops, within the first half of 2021. The assets and liabilities of the AMECO business are classified as held for sale. During 2020, we recognized impairment expense of $146 million, of which $12 million related to goodwill, to reduce the AMECO assets to their fair value less cost to sell. The fair value of the AMECO assets were determined using a combination of observable level 2 inputs, including indicative offers and ongoing negotiations for the related assets. In August 2020, we sold our AMECO equipment business in Jamaica for $18 million and recognized a loss of $1 million. The operations of the AMECO business in Jamaica were included in Disc Ops through the date of sale. In August 2019, we settled legal matters related to a previously divested business. The resulting gain and all associated legal fees were included in "Other" in the tables below. Disc Ops information follows: Year Ended December 31, 2020 Year Ended December 31, 2019 Year Ended December 31, 2018 (in thousands) AMECO Other Total AMECO Other Total AMECO Other Total Revenue $ 215,684 $ — $ 215,684 $ 260,276 $ — $ 260,276 $ 253,130 $ — $ 253,130 Cost of revenue 193,583 — 193,583 277,420 — 277,420 222,139 — 222,139 Corporate general and administrative expense 234 13,198 13,432 239 (21,152) (20,913) 282 4,792 5,074 Impairment of assets held for sale 145,700 — 145,700 — — — — — — Interest expense (income), net 159 — 159 (341) — (341) (354) — (354) Total cost and expenses 339,676 13,198 352,874 277,318 (21,152) 256,166 222,067 4,792 226,859 Earnings (loss) before taxes from Disc Ops (123,992) (13,198) (137,190) (17,042) 21,152 4,110 31,063 (4,792) 26,271 Income tax expense (benefit) 3,957 — 3,957 (3,940) 4,447 507 6,900 (1,064) 5,836 Net earnings (loss) from Disc Ops $ (127,949) $ (13,198) $ (141,147) $ (13,102) $ 16,705 $ 3,603 $ 24,163 $ (3,728) $ 20,435 The following summarizes information related to assets and liabilities classified as held for sale: December 31, 2020 December 31, 2019 (in thousands) AMECO Other Total from Discontinued Operations Other Assets and Liabilities from Continuing Operations Total AMECO Other Total from Discontinued Operations Other Assets and Liabilities from Continuing Operations Total Accounts and notes receivable, net $41,988 $10,476 $52,464 $64 $52,528 $69,126 $15,925 $85,051 $17,513 $102,564 Contract assets 2,188 — 2,188 — 2,188 3,497 — 3,497 3,779 7,276 Other current assets 7,098 — 7,098 2,712 9,810 54,116 — 54,116 8,112 62,228 Current assets held for sale 51,274 10,476 61,750 2,776 64,526 126,739 15,925 142,664 29,404 172,068 Property, plant and equipment, net 113,080 — 113,080 41,160 154,240 232,792 — 232,792 64,792 297,584 Goodwill — — — — — 12,338 — 12,338 9,295 21,633 Investments — — — 5,063 5,063 — — — 7,293 7,293 Other assets 13,788 — 13,788 — 13,788 5,868 — 5,868 12,654 18,522 Noncurrent assets held for sale (1) 126,868 — 126,868 46,223 173,091 250,998 — 250,998 94,034 345,032 Total assets held for sale $178,142 $10,476 $188,618 $48,999 $237,617 $377,737 $15,925 $393,662 $123,438 $517,100 Accounts payable $17,355 $ 13 $17,368 $75 $17,443 $24,692 $ — $24,692 $6,702 $31,394 Contract liabilities 125 — 125 10 135 4,466 — 4,466 25 4,491 Accrued salaries, wages and benefits 6,042 — 6,042 98 6,140 8,913 — 8,913 919 9,832 Other accrued liabilities 11,780 — 11,780 327 12,107 9,451 — 9,451 11,562 21,013 Current liabilities held for sale 35,302 13 35,315 510 35,825 47,522 — 47,522 19,208 66,730 Noncurrent liabilities held for sale (1) 9,479 — 9,479 — 9,479 4,272 — 4,272 11,320 15,592 Total liabilities held for sale $44,781 $13 $44,794 $510 $45,304 $51,794 $ — $51,794 $30,528 $82,322 (1) Noncurrent assets and liabilities held for sale were classified as current as we expect to complete the sale of the AMECO businesses within the first half of 2021. Our cash flow information for 2020, 2019 and 2018 included the following activities related to AMECO Disc Ops: Year Ended December 31, (in thousands) 2020 2019 2018 Impairment expense - Disc Ops $ 145,700 $ — $ — Depreciation of fixed assets — 44,295 72,137 Amortization of stock-based awards 56 123 103 Capital expenditures (23,430) (68,048) (40,856)

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (Unaudited)	Quarterly Financial Data (Unaudited) (in millions, except per share amounts) First Quarter Second Quarter Third Quarter Fourth Quarter Year ended December 31, 2020 Revenue $ 4,118.6 $ 4,091.0 $ 3,803.2 $ 3,655.7 Cost of revenue 4,057.2 4,023.5 3,669.5 3,533.0 Earnings (loss) from Cont Ops before taxes (228.4) 10.9 52.2 (41.7) Net earnings (loss) from Cont Ops (161.6) (20.2) 23.4 (67.2) Amounts attributable to Fluor Corporation: Net earnings (loss) from Cont Ops (171.1) (26.9) 19.1 (115.0) Net earnings (loss) from Disc Ops (94.9) 1.9 0.2 (48.3) Net earnings (loss) $ (266.0) $ (25.0) $ 19.3 $ (163.3) Basic earnings (loss) per share attributable to Fluor Corporation: Net earnings (loss) from Cont Ops $ (1.22) $ (0.19) $ 0.14 $ (0.82) Net earnings (loss) from Disc Ops (0.68) 0.01 — (0.34) Net earnings (loss) $ (1.90) $ (0.18) $ 0.14 $ (1.16) Diluted earnings (loss) per share attributable to Fluor Corporation: Net earnings (loss) from Cont Ops $ (1.22) $ (0.19) $ 0.14 $ (0.82) Net earnings (loss) from Disc Ops (0.68) 0.01 — (0.34) Net earnings (loss) $ (1.90) $ (0.18) $ 0.14 $ (1.16) (in millions, except per share amounts) First Quarter Second Quarter Third Quarter Fourth Quarter Year ended December 31, 2019 Revenue $ 4,133.6 $ 4,146.4 $ 4,628.6 $ 4,408.7 Cost of revenue 4,070.9 4,577.6 4,537.3 4,348.0 Earnings (loss) from Cont Ops before taxes (29.0) (511.9) (258.8) (271.8) Net earnings (loss) from Cont Ops (44.2) (436.1) (754.1) (322.3) Amounts attributable to Fluor Corporation: Net earnings (loss) from Cont Ops (68.1) (397.4) (766.6) (293.7) Net earnings (loss) from Disc Ops (0.8) (16.6) 23.5 (2.5) Net earnings (loss) $ (68.9) $ (414.0) $ (743.1) $ (296.2) Basic earnings (loss) per share attributable to Fluor Corporation: Net earnings (loss) from Cont Ops $ (0.49) $ (2.84) $ (5.47) $ (2.10) Net earnings (loss) from Disc Ops — (0.11) 0.17 (0.01) Net earnings (loss) $ (0.49) $ (2.95) $ (5.30) $ (2.11) Diluted earnings (loss) per share attributable to Fluor Corporation: Net earnings (loss) from Cont Ops $ (0.49) $ (2.84) $ (5.47) $ (2.10) Net earnings (loss) from Disc Ops — (0.11) 0.17 (0.01) Net earnings (loss) $ (0.49) $ (2.95) $ (5.30) $ (2.11) Significant items affecting 2020 earnings included the following: • Charges totaling $298 million for impairments of goodwill, intangible assets, investments and other assets during the first quarter of 2020. • Charges totaling $55 million for current expected credit losses associated with Energy & Chemicals clients during the first quarter of 2020. • Charges totaling $52 million for project positions due to COVID-19 related schedule delays and associated cost growth during the first quarter of 2020. • Charges totaling $100 million and $46 million for impairments of assets held for sale (included in Disc Ops) during the first and fourth quarters of 2020, respectively. Significant items affecting 2019 earnings included the following: • Charges totaling $31 million from the resolution of certain close-out matters with a customer during the first quarter of 2019. • Charges totaling $61 million, $179 million and $20 million from late design changes, schedule-driven cost growth including liquidated damages, and subcontractor negotiations on a lump-sum, offshore project during the first, second and fourth quarters of 2019, respectively. • Charges totaling $26 million and $109 million, including the settlement of client disputes, as well as cost growth related to certain close-out matters, on three lump-sum, gas-fired power plant projects during the first and second quarters of 2019, respectively. • Charges totaling $26 million from the write-off of pre-contract costs during the second quarter of 2019. • Charges totaling $87 million from schedule-driven cost growth and client and subcontractor negotiations on two lump-sum, downstream projects and scope reductions on a large upstream project during the second quarter of 2019. • Charges totaling $55 million and $78 million from late engineering changes and schedule-driven cost growth, as well as negotiations with clients and subcontractors on pending change orders, for several infrastructure projects during the second and fourth quarters of 2019, respectively. • Charges totaling $4 million, $57 million and $21 million for late engineering changes and cost growth related to the Radford project during the first, second and third quarters of 2019, respectively. • Gains of $13 million and $18 million resulting from the favorable resolution of a longstanding customer dispute during the second and third quarters of 2019, respectively. • Charges totaling $59 million for cost growth on the Warren project during the third quarter of 2019. • Charges totaling $546 million and $185 million related to establishing a valuation allowance against deferred tax assets during the third and fourth quarters of 2019, respectively. • Impairment, restructuring and other exit costs totaling $27 million, $27 million, $334 million and $145 million during the first, second, third and fourth quarters of 2019, respectively. • Loss on pension settlement of $138 million during the fourth quarter of 2019.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The financial statements include the accounts of Fluor Corporation and its subsidiaries. All significant intercompany transactions of consolidated subsidiaries are eliminated. Certain amounts disclosed in 2019 and 2018 have been reclassified to conform to the 2020 presentation, which includes presenting the operations of the government business in Cont Ops. Management has evaluated all material events occurring subsequent to December 31, 2020 through the filing date of the 2020 10-K.
Use of Estimates	Use of Estimates The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect reported amounts. These estimates are based on information available through the date of the issuance of the financial statements. Therefore, actual results could differ from those estimates.
Foreign Currency Translation	Foreign Currency Translation Our reporting currency is the U.S. dollar. For our international subsidiaries, the functional currency is typically the currency of the primary economic environment in which each subsidiary operates. Translation gains and losses are recorded in OCI. Gains and losses from remeasuring foreign currency transactions into the functional currency are included in earnings.
Revenue Recognition	Revenue Recognition Engineering and construction contracts. We recognize engineering and construction contract revenue over time as we provide services to satisfy our performance obligations. We generally use the cost-to-cost percentage-of-completion measure of progress as it best depicts how control transfers to our clients. The cost-to-cost approach measures progress towards completion based on the ratio of contract cost incurred to date compared to total estimated contract cost. Engineering and construction contracts are generally accounted for as a single unit of account (a single performance obligation) and are not segmented between types of services on a single project. Cost of revenue includes an allocation of depreciation and amortization. Where applicable, customer-furnished materials, labor and equipment and subcontractor materials, labor and equipment, are included in revenue and cost of revenue when management believes that we are acting as a principal rather than as an agent (i.e., we integrate the materials, labor and equipment into the deliverables promised to the customer). Customer-furnished materials are only included in revenue and cost when the contract includes construction activity and we have visibility into the amount the customer is paying for the materials or there is a reasonable basis for estimating the amount. We recognize revenue, but not profit, on certain uninstalled materials that are not specifically produced, fabricated, or constructed for a project. Revenue on these uninstalled materials is recognized when the cost is incurred and control is transferred. Changes to total estimated contract cost or losses, if any, are recognized in the period in which they are determined as assessed at the contract level. Pre-contract costs are expensed as incurred unless they are expected to be recovered from the client. Project mobilization costs are generally charged to project costs as incurred when they are an integrated part of the performance obligation being transferred to the client. Customer payments on engineering and construction contracts are typically due within 30 to 45 days of billing, depending on the contract. Service contracts. For the majority of our operations and maintenance contracts, revenue is recognized when services are performed and contractually billable. For all other service contracts, we recognize revenue over time using the cost-to-cost percentage-of-completion method. Service contracts that include multiple performance obligations are segmented between types of services. For contracts with multiple performance obligations, we allocate the transaction price to each performance obligation using an estimate of the stand-alone selling price of each distinct service in the contract. Revenue recognized on service contracts that has not been billed to clients is recorded as contract assets. Amounts billed to clients in excess of revenue recognized on service contracts to date are recorded as contract liabilities. Customer payments on service contracts are typically due within 30 to 90 days of billing, depending on the contract. Variable consideration. The nature of our contracts gives rise to several types of variable consideration, including claims, unpriced change orders, award and incentive fees, liquidated damages and penalties. We consider variable consideration in the development of our project forecasts so that our forecasted revenue reflects the amount of consideration we expect to be probable of recovering without a significant reversal. We estimate the amount of revenue to be recognized on variable consideration using the expected value method (i.e., the sum of probability-weighted amounts) or the most likely amount method, whichever offers better prediction. Warranties. We generally provide limited duration warranties for work performed under our contracts. Historically, warranty claims have not resulted in material costs incurred, and any estimated costs for warranties are included in the individual project cost estimates for purposes of accounting for long-term contracts. Practical Expedients. If we have a right to consideration from a customer in an amount that corresponds directly with the value of our performance completed to date (a service contract in which we bill a fixed amount for each hour of service provided), we recognize revenue in the amount to which we have a right to invoice for services performed. We do not adjust the contract price for the effects of a significant financing component where, at contract inception, the period between service provision and customer payment will be one year or less. We exclude from the measurement of the transaction price all taxes assessed by governmental authorities that are collected by us from our customers (use taxes, value added taxes, some excise taxes).
Project Estimates	Project Estimates Due to the nature of our industry, there is significant complexity in our estimation of total expected revenue and cost, for which we must make significant judgments. Our contracts with our customers may contain award fees, incentive fees, liquidated damages or other provisions that can either increase or decrease the contract price to arrive at estimated revenue. These variable amounts generally are earned upon achievement of certain performance metrics, program milestones or cost targets and can be based upon customer discretion. We estimate variable consideration at the most likely amount to which we expect to be entitled. We include estimated amounts in the transaction price to the extent it is probable we will realize that amount. Our estimates of variable consideration and our determination of its inclusion in project revenue for accounting purposes are based on an assessment of our anticipated performance and other information that may be available to us. At a project level, we have specific practices and procedures to review our estimate of total revenue and cost. Each project team reviews the progress and execution of our performance obligations, which impact the project’s accounting outcome. As part of this process, the project team reviews information such as any outstanding key contract matters, progress towards completion and the related program schedule and identified risks and opportunities. The accuracy of our revenue and profit recognition in a given period depends on the accuracy of our project estimates, which can change from period to period for factors such as: • Complexity in original design; • Extent of changes from original design; • Different site conditions than assumed in our bid; • The productivity, availability and skill level of labor; • Weather conditions when executing a project; • The technical maturity of the technologies involved; • Length of time to complete the project; • Availability and cost of equipment and materials; • Subcontractor and joint venture partner performance; • Expected costs of warranties; and • Our ability to recover for additional contract costs.
Contract Assets and Liabilities	Contract Assets and Liabilities    Contract assets represent revenue recognized in excess of amounts billed and include unbilled receivables (typically for cost reimbursable contracts) and contract work in progress (typically for fixed-price contracts). Unbilled receivables, which represent an unconditional right to payment subject only to the passage of time, are recognized as accounts receivable when they are billed under the terms of the contract. Advances that are payments on account of contract assets are deducted from contract assets. We anticipate that substantially all incurred cost associated with contract assets as of December 31, 2020 will be billed and collected within one year. Contract liabilities represent amounts billed to clients in excess of revenue recognized to date.
Segment Reporting	Segment Reporting Management evaluates segment performance based on segment profit. We incur cost and expenses and hold certain assets at the corporate level which relate to our business as a whole. Certain of these amounts have been charged to our business segments by various methods, largely on the basis of usage. Total assets not allocated to segments and held in "Corporate and other" primarily include cash, marketable securities, income-tax related assets, pension assets, deferred compensation trust assets and corporate property, plant and equipment. Segment profit is an earnings measure that we utilize to evaluate and manage our business performance. Segment profit is calculated as revenue less cost of revenue and earnings attributable to NCI.
Variable Interest Entities	Variable Interest Entities We assess our partnerships and joint ventures at inception to determine if any meet the qualifications of a VIE. We consider a partnership or joint venture a VIE if it has any of the following characteristics: (a) the total equity investment is not sufficient to permit the entity to finance its activities without additional subordinated financial support, (b) characteristics of a controlling financial interest are missing (either the ability to make decisions through voting or other rights, the obligation to absorb the expected losses of the entity or the right to receive the expected residual returns of the entity), or (c) the voting rights of the equity holders are not proportional to their obligations to absorb the expected losses of the entity and/or their rights to receive the expected residual returns of the entity, and substantially all of the entity's activities either involve or are conducted on behalf of an investor that has disproportionately few voting rights. Upon the occurrence of certain events, we reassess our initial determination of whether the partnership or joint venture is a VIE. The majority of our partnerships and joint ventures qualify as VIEs because the total equity investment is typically nominal and not sufficient to permit the entity to finance its activities without additional subordinated financial support. We also perform a qualitative assessment of each identified VIE to determine if we are its primary beneficiary. We conclude that we are the primary beneficiary and consolidate the VIE if we have both: (a) the power to direct the economically significant activities of the entity and (b) the obligation to absorb losses of, or the right to receive benefits from, the entity that could potentially be significant to the VIE. We consider the contractual agreements that define the ownership structure, distribution of profits and losses, risks, responsibilities, indebtedness, voting rights and board representation of the respective parties in determining if we are the primary beneficiary. We also consider all parties that have direct or implicit variable interests when determining whether we
Cash and Cash Equivalents	Cash and Cash EquivalentsCash and cash equivalents include securities with maturities of three months or less at the date of purchase.
Marketable Securities	Marketable Securities Marketable securities consist of time deposits placed with investment grade banks with original maturities greater than three months, which are typically held-to-maturity because we have the intent and ability to hold them until maturity. Held-to-maturity securities are carried at amortized cost. Our investments in debt securities are classified as available-for-sale because they may be sold prior to their maturity date. Available-for-sale securities are carried at fair value. The cost of securities sold is determined by using the specific identification method. Marketable securities are assessed at least annually for other-than-temporary impairment.
Research and Development	Research and Development We have a controlling interest in NuScale, a research and development operation associated with the licensing and commercialization of small modular nuclear reactor technology. Since May 2014, NuScale has been receiving reimbursement from the DOE for certain qualified expenditures under cost-sharing award agreements that require NuScale to use the DOE funds to cover first-of-a-kind engineering costs associated with small modular reactor design development and certification. Costs incurred by NuScale are expensed as incurred, net of qualifying DOE reimbursements, and reported in "Cost of revenue". The U.S. Nuclear Regulatory Commission approved NuScale's design certification application in August 2020. Aside from NuScale, we generally do not engage in significant research and development activities.
Property, Plant and Equipment	Property, Plant and EquipmentProperty, plant and equipment is recorded at cost. Leasehold improvements are amortized over the shorter of their economic lives or the lease terms. Depreciation is calculated using the straight-line method over the following ranges of estimated useful service lives, in years
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill and intangible assets with indefinite lives are not amortized but are subject to at least annual impairment tests during the fourth quarter. For impairment testing, goodwill is allocated to the applicable reporting units based on the current reporting structure. We compare the fair value of each reporting unit with its carrying amount. If the carrying amount of a reporting unit exceeds its fair value, an impairment loss is recognized. Intangible assets with indefinite lives are impaired if their carrying value exceeds their fair value. In-process research and development associated with our investment in NuScale is considered indefinite lived until the related technology is available for commercial use. Interim impairment testing of goodwill and intangible assets is performed if indicators of potential impairment exist. Such indicators may include the results of operations of certain businesses and geographies and the performance of the company stock price. Intangible assets with finite lives are amortized on a straight-line basis over their useful lives.
Income Taxes	Income Taxes Deferred tax assets and liabilities are recognized for the expected future tax consequences of events that have been recognized in our financial statements or tax filings. We evaluate the realizability of our deferred tax assets and record a valuation allowance to reduce deferred tax assets to amounts that are more likely than not to be realized. The factors used to assess the likelihood of realization are our forecast of future taxable income and available tax planning strategies that could be implemented to realize such assets. Failure to achieve forecasted taxable income could affect the ultimate realization of deferred tax assets and could adversely impact our future effective tax rate. Income tax positions are recognized when they meet a more-likely-than-not recognition threshold. Previously recognized tax positions that no longer meet the more-likely-than-not threshold are derecognized upon such determination. We recognize potential interest and penalties related to unrecognized tax positions as a component of income tax expense. Judgment is required in determining the provision for income taxes as we consider our worldwide taxable earnings and the impact of the continuing audit process conducted by various tax authorities. The final outcome of any audits could differ materially from amounts recognized by the company. We account for the GILTI effects in the period that is subject to such tax.
Derivatives and Hedging	Derivatives and Hedging We attempt to limit foreign currency exposure in most of our contracts by denominating contract revenue in the currencies in which cost is incurred. Certain financial exposure, which includes currency and commodity price risk associated with engineering and construction contracts, currency risk associated with monetary assets and liabilities denominated in nonfunctional currencies and risk associated with interest rate volatility, may subject us to earnings volatility. We may implement a hedging strategy utilizing derivatives instruments or hedging instruments to mitigate such risk. Our hedging instruments are designated as either fair value or cash flow hedges. We formally document our hedge relationships at inception, including identification of the hedging instruments and the hedged items, our risk management objectives and strategies for undertaking the hedge transaction, and the initial quantitative assessment of the hedging instrument's effectiveness in offsetting changes in the fair value of the hedged items. We subsequently assess hedge effectiveness qualitatively, unless the hedge relationship is no longer highly effective. All hedging instruments are recorded at fair value. For fair value hedges, the change in fair value is offset against the change in the fair value of the underlying asset or liability through earnings. For cash flow hedges, the change in fair value is recorded as a component of AOCI and is reclassified into earnings when the hedged item settles. For derivatives that are not designated or do not qualify as hedging instruments, the change in the fair value of the derivative is offset against the change in the fair value of the underlying asset or liability through earnings. In certain limited circumstances, foreign currency payment provisions could be deemed embedded derivatives. If an embedded foreign currency derivative is identified, the derivative is bifurcated from the host contract and the change in fair value is recognized through earnings. We maintain master netting arrangements with certain counterparties to facilitate the settlement of derivative instruments; however, we report the fair value of derivatives on a gross basis.
Concentrations of Credit Risk	Concentrations of Credit Risk Accounts receivable and all contract work in progress are from clients in various industries and locations throughout the world. Most contracts require payments as the projects progress or, in certain cases, advance payments. We generally do not require collateral, but in most cases can place liens against the project assets or terminate the contract, if a material default occurs. We evaluate the counterparty credit risk as part of our project risk review process and in determining the appropriate level of reserves. We maintain reserves for potential credit losses and generally such losses have been minimal and within management's estimates. Cash and marketable securities are deposited with major banks throughout the world. Such deposits are placed with high quality institutions and the amounts invested in any single institution are limited to the extent possible in order to minimize concentration of counterparty credit risk. Our counterparties for derivatives are large financial institutions selected based on profitability, strength of balance sheet, credit ratings and capacity for timely payment of financial commitments. There are no significant concentrations of credit risk with any individual counterparty related to our derivative contracts. We monitor the credit quality of our counterparties and have not incurred any significant credit risk losses related to our deposits or derivative contracts.
Stock-Based Plans	Stock-Based Plans Our stock plans provide for grants of nonqualified or incentive stock options, RSUs, restricted stock and performance-based award units, including VDI units. All grants of stock options and RSUs as well as performance-based units awarded to Section 16 officers in 2020, 2019 and 2018 can only be settled in company stock and are accounted for as equity awards. All expense under stock-based awards is recognized based on the fair values of the awards. Stock option awards have grant exercise prices equal to the grant date market price of the company's stock. The fair value of grants of RSUs and restricted stock is determined using the closing price of our common stock on the date of grant but may be discounted for any post-vest holding periods. The grant date fair value of performance-based award units is determined by adjusting the closing price of the company's common stock on the date of grant for any post-vest holding period discounts and for the effect of market conditions, when applicable. Stock-based compensation expense is generally recognized over the required service period, or over a shorter period when employee retirement eligibility is a factor. We also grant SGI awards and performance-based awards to non-Section 16 executives which are settled in cash. These awards are classified as liabilities and remeasured at fair value through expense at the end of each reporting period using our closing stock price until the awards are settled. Awards that may be settled in cash or company stock at the election of the recipient are also classified as liability awards.
Leases	Leases We recognize right-of-use assets and lease liabilities for leases with terms greater than 12 months or leases that contain a purchase option that is reasonably certain to be exercised. Leases are classified as either finance or operating leases. This classification dictates whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. Our right-of use assets and lease liabilities primarily relate to office facilities, equipment used in connection with long-term construction contracts and other personal property. Certain of our facility and equipment leases include one or more options to renew, with renewal terms that can extend the lease term up to 10 years. The exercise of lease renewal options is at our discretion. Renewal periods are included in the expected lease term if they are reasonably certain of being exercised by us. Certain leases also include options to purchase the leased property. None of our lease agreements contain material residual value guarantees or material restrictions or covenants. Long-term leases (leases with terms greater than 12 months) are recorded as liabilities at the present value of the minimum lease payments not yet paid. We use our incremental borrowing rate to determine the present value of the lease when the rate implicit in the lease is not readily determinable. Certain lease contracts contain nonlease components such as maintenance, utilities, fuel and operator services. We recognize both the lease component and nonlease components as a single lease component for all of its right-of-use assets. From time to time, certain service or purchase contracts may contain an embedded lease.
Recent Accounting Pronouncements	Accounting Pronouncements Implemented During 2020 On January 1, 2020, we adopted ASC Topic 326, “Financial Instruments - Credit Losses,” which replaces the incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of information to estimate credit losses. The new guidance requires financial assets measured at amortized cost to be presented at the net amount expected to be collected. We adopted ASC 326 using the modified retrospective method, and accordingly, the new guidance was applied to financial assets measured at amortized cost (primarily accounts receivable and contract assets) that existed as of January 1, 2020 (the date of initial application). As a result, we recorded additional reserves for credit losses of $2 million and a cumulative effect adjustment to decrease retained earnings by $2 million as of January 1, 2020. The adoption of ASC 326 did not have a material impact on our results of operations or any impact on our cash flows. We utilize a combination of methods for estimating expected credit losses including loss rates, aging schedules and probability-of-default. In evaluating our historical loss rates, accounts receivable and contract assets are pooled into the following categories based on similar risk characteristics: (1) EPC management; (2) government; (3) operations and maintenance; and (4) equipment leasing. Historical loss experience is adjusted for current conditions and reasonable and supportable forecasts, when applicable. Significantly aged receivables are evaluated individually by credit rating. Our reserve for credit losses amounted to $39 million and $35 million as of December 31, 2020 and 2019. In the first quarter of 2020, we adopted ASU 2019-12, “Simplifying the Accounting for Income Taxes,” which eliminates certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The adoption did not have a material impact on our financial statements. In the first quarter of 2020, we adopted ASU 2018-18, “Clarifying the Interaction between Topic 808 and Topic 606,” which clarifies that certain transactions between participants in a collaborative arrangement should be accounted for under ASC 606 when the counterparty is a customer. The adoption did not have any impact on our financial statements. In the first quarter of 2020, we adopted ASU 2018-17, “Targeted Improvements to Related Party Guidance for Variable Interest Entities,” which amends the guidance for determining whether a decision-making fee is a variable interest. The adoption did not have any impact on our financial statements. In the first quarter of 2020, we adopted ASU 2018-15, “Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” which requires customers in a hosting arrangement that is a service contract to capitalize certain implementation costs as if the arrangement was an internal-use software project. The adoption did not have any impact on our financial statements. In the first quarter of 2020, we adopted ASU 2018-13, “Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement,” which amends certain disclosure requirements for fair value measurements. For example, public companies will now be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. The adoption did not have any impact on our financial statements, but we have made additional disclosures related to the range and weighted average rates used to develop significant inputs for nonrecurring Level 3 measurements. In the fourth quarter of 2020, we adopted ASU 2018-14, “Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans,” which amends certain disclosure requirements related to defined benefit pension and other postretirement plans. The adoption did not have a material impact on our financial statements.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Schedule of property, plant and equipment and ranges of estimated useful service lives	Depreciation is calculated using the straight-line method over the following ranges of estimated useful service lives, in years: Estimated Useful Service Lives Buildings 20 – 40 Building and leasehold improvements 6 – 20 Machinery and equipment 2 – 10 Furniture and fixtures 2 – 10 Property, plant and equipment is as follows: December 31, (cost in thousands) 2020 2019 Land $ 52,424 $ 50,129 Buildings 299,560 279,901 Building and leasehold improvements 153,333 155,917 Machinery and equipment 927,075 875,581 Furniture and fixtures 144,667 133,573 Construction in progress 21,250 63,814 1,598,309 1,558,915 Less accumulated depreciation (1,037,225) (964,089) Net property, plant and equipment $ 561,084 $ 594,826

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Schedule of calculations of basic and diluted EPS	Year Ended December 31, (in thousands, except per share amounts) 2020 2019 2018 Amounts attributable to Fluor Corporation: Net earnings (loss) from Cont Ops $ (293,899) $ (1,525,767) $ 153,033 Net earnings (loss) from Disc Ops (141,147) 3,603 20,435 Net earnings (loss) $ (435,046) $ (1,522,164) $ 173,468 Basic EPS attributable to Fluor Corporation: Weighted average common shares outstanding 140,511 140,061 140,413 Net earnings (loss) from Cont Ops $ (2.09) $ (10.89) $ 1.09 Net earnings (loss) from Disc Ops (1.01) 0.02 0.15 Net earnings (loss) $ (3.10) $ (10.87) $ 1.24 Diluted EPS attributable to Fluor Corporation: Weighted average common shares outstanding 140,511 140,061 140,413 Dilutive effects: Stock options, RSUs, restricted stock and performance-based award units (1) — — 859 Weighted average diluted shares outstanding 140,511 140,061 141,272 Net earnings (loss) from Cont Ops $ (2.09) $ (10.89) $ 1.08 Net earnings (loss) from Disc Ops (1.01) 0.02 0.15 Net earnings (loss) $ (3.10) $ (10.87) $ 1.23 (1) Anti-dilutive securities not included in shares outstanding 709 593 —

Operating Information by Segm_2

Operating Information by Segment and Geographic Area (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Schedule of operating information by segment	Year Ended December 31, (in millions) 2020 2019 2018 Revenue Energy & Chemicals $ 5,260.4 $ 5,823.7 $ 7,695.5 Mining & Industrial 4,149.1 5,057.2 3,491.0 Infrastructure & Power 1,595.5 1,370.4 1,668.0 Government 2,922.8 2,969.3 3,678.5 Diversified Services 1,630.9 2,040.1 2,257.2 Other 109.8 56.6 60.8 Total revenue $ 15,668.5 $ 17,317.3 $ 18,851.0 Segment profit (loss) Energy & Chemicals $ 163.7 $ (95.0) $ 334.5 Mining & Industrial 122.4 158.5 94.3 Infrastructure & Power 13.7 (243.9) (30.1) Government 88.4 200.3 187.3 Diversified Services 14.2 14.6 68.7 Other (85.4) (220.1) (144.7) Total segment profit $ 317.0 $ (185.6) $ 510.0 Depreciation (all but Corporate included in segment profit) Energy & Chemicals $ — $ — $ — Mining & Industrial — — — Infrastructure & Power 10.0 7.3 6.7 Government 4.0 4.0 3.6 Diversified Services 21.9 34.5 52.1 Other 1.7 2.8 3.2 Corporate 64.9 61.7 59.8 Total depreciation (1) $ 102.5 $ 110.3 $ 125.4 Capital expenditures Energy & Chemicals $ — $ — $ — Mining & Industrial — — — Infrastructure & Power 28.8 12.2 24.5 Government 3.2 3.0 6.9 Diversified Services 24.6 33.6 46.9 Other 3.4 1.5 1.8 Corporate 30.0 62.5 90.0 Total capital expenditures (2) $ 90.0 $ 112.8 $ 170.1 December 31, 2020 December 31, 2019 Total assets Energy & Chemicals $ 1,004.6 $ 1,139.3 Mining & Industrial 508.5 594.9 Infrastructure & Power 469.3 471.3 Government 575.4 629.1 Diversified Services 950.6 1,290.6 Other 38.1 68.5 Corporate 3,574.7 3,379.3 Discontinued Operations - Assets held for sale 188.6 393.7 Total assets $ 7,309.8 $ 7,966.7 Goodwill Energy & Chemicals $ 12.6 $ 12.6 Mining & Industrial 9.2 8.2 Infrastructure & Power 2.5 2.5 Government 58.0 58.0 Diversified Services 260.8 420.9 Other 6.2 6.2 Total Goodwill $ 349.3 $ 508.4 (1) Depreciation of $44 million and $72 million during 2019 and 2018, respectively, was included in discontinued operations and excluded from the table above. (2) Capital expenditures of $23 million, $68 million and $41 million during 2020, 2019 and 2018, respectively, were included in discontinued operations and excluded from the table above.
Schedule of reconciliation of total segment profit to earnings from continuing operations before taxes	Reconciliation of Total Segment Profit (Loss) to Earnings (Loss) from Continuing Operations Before Taxes Year Ended December 31, (in millions) 2020 2019 2018 Total segment profit (loss) $ 317.0 $ (185.6) $ 510.0 Corporate general and administrative expense (240.7) (165.9) (121.2) Impairment, restructuring and other exit costs (305.6) (532.6) — Gain (loss) on pension settlement 0.4 (137.9) (21.9) Interest income (expense), net (46.4) (18.5) (40.6) Earnings (loss) attributable to NCI from continuing operations 68.2 (31.0) 59.4 Earnings (loss) from continuing operations before taxes $ (207.1) $ (1,071.5) $ 385.7
Schedule of operating information by geographic area	Operating Information by Geographic Area Revenue by project location Total Assets (in millions) 2020 2019 2018 2020 2019 North America $ 9,806.4 $ 8,439.7 $ 8,982.1 $ 3,982.4 $ 3,728.8 Asia Pacific (includes Australia) 1,398.2 1,763.3 1,494.0 562.1 533.7 Europe 2,517.5 3,731.6 5,326.6 1,403.9 1,906.9 Central and South America 1,388.1 2,375.3 1,262.6 812.8 1,233.6 Middle East and Africa 558.3 1,007.4 1,785.7 548.6 563.7 Total $ 15,668.5 $ 17,317.3 $ 18,851.0 $ 7,309.8 $ 7,966.7

Impairment, Restructuring and_2

Impairment, Restructuring and Other Exit Costs (Tables)	12 Months Ended
	Dec. 31, 2020
Restructuring and Related Activities [Abstract]
Reconciliation of restructuring costs and liability	Information about our restructuring, which we believe is complete as of December 31, 2020, follows: (in millions) Costs Incurred in 2020 Costs Incurred in Restructuring and other exit costs: Severance $ 6.6 $ 63.9 Asset impairments 0.4 90.4 Entity liquidation costs (including the recognition of cumulative translation adjustments) — 83.7 Other exit costs 1.0 2.0 Total restructuring and other exit costs $ 8.0 $ 240.0 A reconciliation of restructuring liabilities follow: (in thousands) Severance Lease Exit Costs Other Total Balance as of December 31, 2019 $ 46,303 $ 570 $ 307 $ 47,180 Restructuring charges accrued during the period 6,965 334 687 7,986 Cash payments / settlements during the period (32,292) (799) (993) (34,084) Currency translation 2,282 1 (1) 2,282 Balance as of December 31, 2020 $ 23,258 $ 106 $ — $ 23,364
Schedule of Impairment Expense	Impairment expense is summarized as follows: Year Ended December 31, (in thousands) 2020 2019 Impairment expense: Goodwill associated with the Diversified Services reporting unit $ 168,568 $ 2,125 Intangible customer relationships associated with Stork 26,671 33,657 Equity method investments in the Energy & Chemicals segment 86,096 256,769 Information technology assets 16,269 — Total impairment expense $ 297,604 $ 292,551

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of income tax expense (benefit) included in Consolidated Statement of Earnings from continuing operations	The income tax expense (benefit) components recognized in continuing operations follow: Year Ended December 31, (in thousands) 2020 2019 2018 Current: Federal $ (121,411) $ (36,591) $ (19,199) Foreign 140,551 163,141 115,281 State and local 5,343 4,295 12,377 Total current 24,483 130,845 108,459 Deferred: Federal 17,451 325,351 16,800 Foreign (23,342) 9,593 55,208 State and local — 19,441 (7,136) Total deferred (5,891) 354,385 64,872 Total income tax expense $ 18,592 $ 485,230 $ 173,331
Schedule of reconciliation of U.S. statutory federal income tax expense to income tax expense	A reconciliation of U.S. statutory federal income tax expense (benefit) to income tax expense (benefit) from continuing operations follows: Year Ended December 31, (in thousands) 2020 2019 2018 U.S. statutory federal tax expense (benefit) $ (43,481) $ (225,014) $ 81,007 Increase (decrease) in taxes resulting from: State and local income taxes (10,614) (11,135) (13,668) U.S. tax on GILTI — — 10,649 NCI (9,466) 11,565 (7,200) Foreign tax differential, net 38,667 13,479 1,460 Valuation allowance, net 148,783 730,787 79,168 Other changes to uncertain tax positions 7,484 4,098 7,753 Stranded tax effects from AOCI — (35,619) — Impact of tax reform — — (1,373) CARES Act Benefit (124,753) — — Other, net 11,972 (2,931) 15,535 Total income tax expense $ 18,592 $ 485,230 $ 173,331
Schedule of tax effects of significant temporary differences giving rise to deferred tax assets and liabilities	The tax effects of significant temporary differences giving rise to deferred tax assets and liabilities are as follows: December 31, (in thousands) 2020 2019 Deferred tax assets: Accrued liabilities not currently deductible: Employee compensation and benefits $ 104,305 $ 116,162 Project and non-project reserves 71,999 60,768 Net operating loss carryforward 326,402 357,803 Tax basis of investment in excess of book basis 118,915 88,255 U.S. foreign tax credit carryforward 414,348 226,845 AOCI 62,681 67,258 Other 103,955 85,059 Total deferred tax assets 1,202,605 1,002,150 Valuation allowance (1,080,752) (910,336) Deferred tax assets, net $ 121,853 $ 91,814 Deferred tax liabilities: Book basis of property and equipment in excess of tax basis (43,475) (29,846) Dividend withholding on unremitted non-U.S. earnings (57,859) (49,663) Other (23,349) (32,912) Total deferred tax liabilities (124,683) (112,421) Deferred tax assets, net of deferred tax liabilities $ (2,830) $ (20,607)
Schedule of reconciliation of beginning and ending amount of unrecognized tax benefits including interest and penalties	A summary of unrecognized tax benefits follows: (in thousands) 2020 2019 Balance at beginning of year $ 42,394 $ 55,476 Change in tax positions of prior years 8,166 6,359 Change in tax positions of current year — — Reduction in tax positions for statute expirations (1,510) (16,894) Reduction in tax positions for audit settlements (637) (2,547) Balance at end of year $ 48,413 $ 42,394
Schedule of U.S. and foreign earnings from continuing operations before taxes	Year Ended December 31, (in thousands) 2020 2019 2018 United States $ (265,682) $ (968,280) $ (252,376) Foreign 58,630 (103,215) 638,125 Total $ (207,052) $ (1,071,495) $ 385,749

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]
Consolidated statements of cash flows	The changes in assets and liabilities included in operating cash flow follow: Year Ended December 31, (in thousands) 2020 2019 2018 (Increase) decrease in: Accounts and notes receivable, net $ 138,388 $ 210,419 $ (40,632) Contract assets 280,360 207,467 (83,774) Other current assets 3,893 (80,248) 168,021 Other assets 109,405 100,527 (25,424) Increase (decrease) in: Accounts payable (343,113) (46,873) 176,335 Contract liabilities (53,580) 202,359 (307,844) Accrued liabilities (11,829) 29,880 (75,878) Other liabilities (93,723) 9,496 (38,536) Increase (decrease) in cash due to changes in assets and liabilities $ 29,801 $ 633,027 $ (227,732) Cash paid during the year for: Interest $ 65,641 $ 71,938 $ 66,514 Income taxes (net of refunds) 65,188 204,080 (28,408) Year Ended December 31, (in thousands) 2020 2019 2018 Impairment expense - Disc Ops $ 145,700 $ — $ — Depreciation of fixed assets — 44,295 72,137 Amortization of stock-based awards 56 123 103 Capital expenditures (23,430) (68,048) (40,856)

Partnerships and Joint Ventur_2

Partnerships and Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	The following is a summary of aggregate, unaudited balance sheet data for unconsolidated entities where our investment is presented as a one-line equity method investment: December 31, (in millions) 2020 2019 Current assets $ 8,138 $ 6,927 Noncurrent assets 4,745 5,109 Current liabilities 6,307 4,605 Noncurrent liabilities 4,354 5,256 The following is a summary of aggregate, unaudited income statement data for unconsolidated entities where the equity method of accounting is used to recognize our share of net earnings or loss of investees: (in millions) 2020 2019 2018 Revenue $ 1,209 $ 1,258 $ 1,465 Cost of revenue 1,104 1,151 1,338 Net earnings 54 45 35

Revenue from Contract with Cust

Revenue from Contract with Customer (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract Assets and Liabilities	The following summarizes information about our contract assets and liabilities: December 31, (in millions) 2020 2019 Information about contract assets: Contract assets Unbilled receivables $ 681 $ 851 Contract work in progress 287 387 Contract assets $ 968 $ 1,238 Advance billings deducted from contract assets $ 310 $ 574 Year Ended December 31, 2020 2019 Information about contract liabilities: Provision for anticipated losses on contracts included in contract liabilities $ 203 $ 371 Revenue recognized that was included in contract liabilities as of January 1 755 779

Remaining Unsatisfied Perform_2

Remaining Unsatisfied Performance Obligations (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Schedule of remaining performance obligation	We estimate that our RUPO will be satisfied over the following periods: (in millions) December 31, 2020 Within 1 year $ 10,873 1 to 2 years 6,150 Thereafter 6,445 Total remaining unsatisfied performance obligations $ 23,468

Lines of Credit, Senior Notes_2

Lines of Credit, Senior Notes and Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Schedule of consolidated debt	Debt consisted of the following: December 31, (in thousands) 2020 2019 Current: Other borrowings $ 25,415 $ 38,728 Long-Term: Senior Notes 2023 Notes $ 609,764 $ 557,185 2024 Notes 496,200 495,240 2028 Notes 595,134 594,502 Other borrowings 8,935 4,812 Borrowings under committed lines of credit $ — $ —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value on a recurring basis	The following table delineates assets and liabilities that are measured at fair value on a recurring basis: December 31, 2020 December 31, 2019 (in thousands) Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Assets: Deferred compensation trusts (1) $ 9,626 $ 9,626 $ — $ — $ 7,719 $ 7,719 $ — $ — Derivative assets (2) Foreign currency 22,667 — 22,667 — 7,167 — 7,167 — Commodity 806 — 806 — 46 — 46 — Liabilities: Derivative liabilities (2) Foreign currency $ 2,571 $ — $ 2,571 $ — $ 6,561 $ — $ 6,561 $ — Commodity 5,059 — 5,059 — 1,247 — 1,247 — (1) Consists of registered money market funds and an equity index fund. These investments, which are trading securities, represent the net asset value as of the close of business at the end of the period based on the last trade or official close of an active market or exchange. (2) Foreign currency and commodity derivatives are estimated using pricing models with market-based inputs, which take into account the present value of estimated future cash flows.
Schedule of carrying values and estimated fair values of financial instruments not required to be measured at fair value	The following summarizes information about our financial instruments that are not required to be measured at fair value: December 31, 2020 December 31, 2019 (in thousands) Fair Value Hierarchy Carrying Value Fair Value Carrying Value Fair Value Assets: Cash (1) Level 1 $ 1,180,024 $ 1,180,024 $ 1,014,138 $ 1,014,138 Cash equivalents (2) Level 2 1,018,757 1,018,757 983,061 983,061 Marketable securities, current (2) Level 2 23,345 23,345 7,262 7,262 Notes receivable, including noncurrent portion (3) Level 3 38,295 38,295 28,117 28,117 Liabilities: 2023 Senior Notes (4) Level 2 $ 609,764 $ 578,554 $ 557,185 $ 562,399 2024 Senior Notes (4) Level 2 496,200 494,045 495,240 510,145 2028 Senior Notes (4) Level 2 595,134 599,220 594,502 609,918 Other borrowings, including noncurrent portion (5) Level 2 34,350 34,350 43,539 43,539 _______________________________________________________________________________ (1) Cash consists of bank deposits. Carrying amounts approximate fair value. (2) The carrying amounts of these time deposits approximate fair value because of the short-term maturity of these instruments. Amortized cost is not materially different from the fair value. (3) Notes receivable are carried at net realizable value which approximates fair value. Factors considered in determining the fair value include the credit worthiness of the borrower, current interest rates, the term of the note and any collateral pledged as security. Notes receivable are periodically assessed for impairment. (4) The fair value of the Senior Notes was estimated based on quoted market prices and Level 2 inputs. (5) Other borrowings primarily represent bank loans and other financing arrangements which primarily mature within one year. The carrying amount of borrowings under these arrangements approximates fair value because of the short-term maturity.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	The following table provides a summary of each major intangible asset class: December 31, 2020 December 31, 2019 Weighted (in thousands) Gross Carrying Amount Accumulated Amortization Net Book Value Gross Carrying Amount Accumulated Amortization Net Book Value Customer relationships (finite-lived) $ — $ — $ — $ 31,894 $ (451) $ 31,443 8 Trade names (finite-lived) 9,169 (4,844) 4,325 8,388 (3,460) 4,928 13 Trade names (indefinite-lived) 53,411 — 53,411 49,789 — 49,789 — In-process research and development (indefinite-lived) 16,900 — 16,900 16,900 — 16,900 — Other (finite-lived) 10,742 (7,805) 2,937 10,399 (6,919) 3,480 10 Total intangible assets (1) $ 90,222 $ (12,649) $ 77,573 $ 117,370 $ (10,830) $ 106,540
Schedule of Indefinite-Lived Intangible Assets	The following table provides a summary of each major intangible asset class: December 31, 2020 December 31, 2019 Weighted (in thousands) Gross Carrying Amount Accumulated Amortization Net Book Value Gross Carrying Amount Accumulated Amortization Net Book Value Customer relationships (finite-lived) $ — $ — $ — $ 31,894 $ (451) $ 31,443 8 Trade names (finite-lived) 9,169 (4,844) 4,325 8,388 (3,460) 4,928 13 Trade names (indefinite-lived) 53,411 — 53,411 49,789 — 49,789 — In-process research and development (indefinite-lived) 16,900 — 16,900 16,900 — 16,900 — Other (finite-lived) 10,742 (7,805) 2,937 10,399 (6,919) 3,480 10 Total intangible assets (1) $ 90,222 $ (12,649) $ 77,573 $ 117,370 $ (10,830) $ 106,540

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Schedule of property, plant and equipment	Depreciation is calculated using the straight-line method over the following ranges of estimated useful service lives, in years: Estimated Useful Service Lives Buildings 20 – 40 Building and leasehold improvements 6 – 20 Machinery and equipment 2 – 10 Furniture and fixtures 2 – 10 Property, plant and equipment is as follows: December 31, (cost in thousands) 2020 2019 Land $ 52,424 $ 50,129 Buildings 299,560 279,901 Building and leasehold improvements 153,333 155,917 Machinery and equipment 927,075 875,581 Furniture and fixtures 144,667 133,573 Construction in progress 21,250 63,814 1,598,309 1,558,915 Less accumulated depreciation (1,037,225) (964,089) Net property, plant and equipment $ 561,084 $ 594,826

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Summary of restricted stock, restricted stock unit and stock option activity	The following table summarizes RSU, restricted stock and stock option activity: RSU or Stock Options Number Weighted Number Weighted Outstanding as of December 31, 2017 933,464 $51.85 5,069,956 $60.08 Granted 603,111 57.88 33,615 58.15 Forfeited or expired (38,365) 54.07 (352,624) 64.64 Vested/exercised (513,078) 51.58 (161,562) 44.92 Outstanding as of December 31, 2018 985,132 $53.78 4,589,385 $60.25 Granted 1,356,303 32.68 1,192,108 22.47 Forfeited or expired (173,604) 39.57 (351,885) 60.56 Vested/exercised (507,520) 47.72 (48,131) 30.46 Outstanding as of December 31, 2019 1,660,311 $39.88 5,381,477 $52.13 Granted 1,355,975 10.30 975,290 11.06 Forfeited or expired (114,352) 33.74 (603,835) 59.46 Vested/exercised (643,340) 42.23 — — Outstanding as of December 31, 2020 2,258,594 $21.76 5,752,932 $44.40 Options exercisable as of December 31, 2020 3,784,647 $58.80 Remaining unvested options outstanding and expected to vest 1,948,602 $16.72 Performance-based Award Units Granted in 2020 Weighted 2020 Performance Award Plan 385,455 $9.05 2019 Performance Award Plan 116,844 $9.77 2018 Performance Award Plan 68,866 $10.75
Schedule of fair value on grant date and significant assumptions used in Black-Scholes option-pricing model	The grant date fair value of options and other significant assumptions follow: January 1 - November 30, 2020 December 31, 2020 January 1 - September 30, 2019 October 1 - December 31, 2019 2018 Weighted average grant date fair value $4.59 $9.05 $7.99 $6.93 $14.87 Expected life of options (in years) 4.6 7.2 5.6 5.4 5.3 Risk-free interest rate 0.4 % 0.5 % 2.6 % 1.7 % 2.7 % Expected volatility 64.9 % 60.8 % 33.3 % 46.6 % 28.2 % Expected annual dividend per share $0.00 $0.00 $0.84 $0.40 $0.84
Summary of information related to options outstanding	Information related to options outstanding as of December 31, 2020 follows: Options Outstanding Options Exercisable Range of Exercise Prices Number Weighted Weighted Number Weighted Weighted $8.81 - $29.50 2,088,027 9.2 $ 17.27 130,947 8.4 $ 29.03 $46.07 - $62.50 3,054,457 4.4 56.48 3,043,252 4.4 56.47 $70.76 - $79.19 610,448 2.3 76.77 610,448 2.3 76.77 5,752,932 5.9 $ 44.40 3,784,647 4.2 $ 58.80

Retirement Benefits (Tables)

Retirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
Schedule of components of net periodic pension expense	Net periodic pension expense for our DB Plans included the following components: Year Ended December 31, (in thousands) 2020 2019 2018 Service cost $ 18,129 $ 15,750 $ 17,999 Interest cost 9,899 19,617 21,820 Expected return on assets (26,304) (32,645) (38,064) Amortization of prior service credit (903) (886) (935) Recognized net actuarial loss 5,806 10,303 8,368 (Gain) loss on settlement (406) 137,898 21,900 Net periodic pension expense $ 6,221 $ 150,037 $ 31,088
Schedule of assumptions for determining projected benefit obligation at year end and net periodic cost for year	December 31, 2020 2019 2018 For determining projected benefit obligation ("PBO") at year-end: Discount rates 0.80-3.50% 1.20-4.75% 1.80-7.25% Rates of increase in compensation levels 2.25-6.00% 2.25-6.00% 2.25-7.00% For determining net periodic cost for the year: Discount rates 1.20-4.75% 1.80-7.25% 1.90-5.50% Rates of increase in compensation levels 2.25-6.00% 2.25-7.00% 2.25-7.00% Expected long-term rates of return on assets 1.20-5.60% 1.80-8.20% 1.90-7.00%
Schedule of target allocations and weighted average actual allocations of plan assets	The following table sets forth the target and actual allocations of plan assets: December 31, 2020 Target Allocation 2020 2019 Asset category: Debt securities 55% - 65% 63 % 60 % Equity securities 25% - 35% 28 % 31 % Other 0% - 10% 9 % 9 % Total 100 % 100 %
Schedule of plan assets and liabilities of defined benefit pension plans, measured at fair value on a recurring basis	The following table delineates the fair value of the plan assets and liabilities of our DB Plans: December 31, 2020 December 31, 2019 (in thousands) Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Assets: Equity securities: Common stock $ 5,252 $ 5,252 $ — $ — $ 5,346 $ 5,346 $ — $ — CCTs 230,135 — 230,135 — 215,904 — 215,904 — Debt securities: Corporate bonds 532 — 532 — 493 — 493 — Government securities 12,036 — 12,036 — 12,962 — 12,962 — CCTs 507,691 — 507,691 — 412,416 — 412,416 — Other: Guaranteed investment contracts 20,588 — — 20,588 19,650 — — 19,650 CCTs 51,679 — 51,679 — 43,302 — 43,302 — Plan assets measured at fair value, net $ 827,913 $ 5,252 $ 802,073 $ 20,588 $ 710,073 $ 5,346 $ 685,077 $ 19,650 Plan assets not measured at fair value, net 1,507 590 Total plan assets, net $ 829,420 $ 710,663
Reconciliation of beginning and ending balances of fair value measurements using significant unobservable inputs (Level 3)	The following table presents information about Level 3 fair value measurements: (in thousands) 2020 2019 Balance at beginning of year $ 19,650 $ 374,724 Actual return on plan assets: Assets still held at reporting date 2,092 1,609 Assets sold during the period — 49,524 Purchases 343 187 Settlements (1,497) (406,394) Balance at end of year $ 20,588 $ 19,650
Schedule of expected benefit payments for defined benefit pension plans	The following table presents expected future benefit payments related to our DB Plans: Year Ended December 31, (in thousands) 2021 $ 21,387 2022 21,461 2023 21,677 2024 22,347 2025 23,065 2026 — 2030 125,302
Schedule of change in projected benefit obligation, plan assets and funded status	The following table sets forth the change in PBO, plan assets and funded status of the plans: December 31, (in thousands) 2020 2019 Change in PBO: Benefit obligation at beginning of year $ 748,784 $ 1,020,633 Service cost 18,129 15,750 Interest cost 9,899 19,617 Employee contributions 2,860 3,382 Currency translation 72,178 (2,794) Actuarial (gain) loss (1) 58,258 117,549 Benefits paid (17,224) (27,362) Divestitures — (1,669) Curtailments (6,574) — Settlements (16,475) (396,322) PBO at end of year 869,835 748,784 Change in plan assets: Plan assets at beginning of year 710,663 964,289 Actual return on plan assets 55,819 153,033 Company contributions 24,752 14,591 Employee contributions 2,860 3,382 Currency translation 69,025 (948) Benefits paid (17,224) (27,362) Settlements (16,475) (396,322) Plan assets at end of year 829,420 710,663 Funded status — (Under)/overfunded $ (40,415) $ (38,121) Amounts recognized in the Consolidated Balance Sheet: Pension assets included in other assets $ — $ 1,349 Pension liabilities included in other accrued liabilities (647) (2,041) Pension liabilities included in noncurrent liabilities (39,768) (37,429) AOCI (pre-tax) $ 161,534 $ 130,619 Plans with PBO in excess of plan assets: PBO $ 869,835 $ 78,961 Plan assets 829,420 39,491 Plans with ABO in excess of plan assets: ABO $ 45,757 $ 73,865 Plan assets 20,588 39,491

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases, Operating [Abstract]
Components of lease expense	The following summarizes lease expense: Year Ended Year Ended December 31, 2019 Lease Expense / (Sublease Income) Continuing Operations Discontinued Operations Continuing Operations Discontinued Operations (in thousands) Operating lease cost $ 83,938 $ 792 $ 90,591 $ 809 Finance lease cost Amortization of right-of-use assets 651 676 1,394 27 Interest on lease liabilities 23 117 65 2 Variable lease cost (1) 7,415 — 19,231 — Short-term lease cost 92,161 24,900 119,737 43,807 Sublease income (6,797) (10,278) (8,905) (25,832) Total lease expense $ 177,391 $ 16,207 $ 222,113 $ 18,813 (1) Primarily relates to rent escalation due to cost of living indexation and payments for property taxes, insurance or common area maintenance based on actual assessments.
Information related to right-of use assets and lease liabilities	Information related to our right-of use assets and lease liabilities follows: December 31, 2020 December 31, 2019 Lease Assets / Liabilities Balance Sheet Classification Cont Ops Disc Ops Cont Ops Disc Ops (in thousands) Right-of-use assets Operating lease assets Other assets $ 215,134 $ — $ 259,169 $ — Operating lease assets Current assets held for sale — 2,434 13,123 3,259 Finance lease assets Other assets 400 — 937 — Finance lease assets Current assets held for sale — 9,069 — 181 Total right-of-use assets $ 215,534 $ 11,503 $ 273,229 $ 3,440 Lease liabilities Operating lease liabilities, current Other accrued liabilities $ 62,180 $ — $ 65,961 $ — Operating lease liabilities, noncurrent Noncurrent liabilities 176,776 — 219,146 — Operating lease liabilities Current liabilities held for sale — 2,434 13,228 3,180 Finance lease liabilities, current Other accrued liabilities 114 — 906 — Finance lease liabilities, noncurrent Noncurrent liabilities — — 8 — Finance lease liabilities Current liabilities held for sale — 8,327 — 191 Total lease liabilities $ 239,070 $ 10,761 $ 299,249 $ 3,371
Supplemental information related to leases	Supplemental information related to our leases follows: Year Ended Year Ended Cont Ops Disc Ops Cont Ops Disc Ops (in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 89,649 $ 780 $ 91,308 $ 787 Operating cash flows from finance leases 23 117 65 3 Financing cash flows from finance leases 761 1,365 1,547 25 Right-of-use assets obtained in exchange for new operating lease liabilities 20,471 — 96,984 546 Right-of-use assets obtained in exchange for new finance lease liabilities — 8,663 — 222 Weighted-average remaining lease term - operating leases 6.1 years 4.3 years 6.5 years 4.8 years Weighted-average remaining lease term - finance leases 2.1 years 5.0 years 2.2 years 3.5 years Weighted-average discount rate - operating leases 3.04 % 3.47 % 3.34 % 3.50 % Weighted-average discount rate - finance leases 3.39 % 2.72 % 3.38 % 2.64 %
Remaining lease payments under operating leases	The remaining lease payments under our operating and finance leases follows: Cont Ops Disc Ops Year Ended December 31, Operating Finance Operating Finance (in thousands) 2021 $ 68,649 $ 8 $ 654 $ 2,927 2022 55,736 55 609 2,906 2023 41,029 62 554 1,436 2024 28,211 — 482 821 2025 20,275 — 324 612 Thereafter 47,358 — — — Total lease payments $ 261,258 $ 125 $ 2,623 $ 8,702 Less: Interest (22,302) (11) (189) (375) Present value of lease liabilities $ 238,956 $ 114 $ 2,434 $ 8,327
Remaining lease payments under finance leases	The remaining lease payments under our operating and finance leases follows: Cont Ops Disc Ops Year Ended December 31, Operating Finance Operating Finance (in thousands) 2021 $ 68,649 $ 8 $ 654 $ 2,927 2022 55,736 55 609 2,906 2023 41,029 62 554 1,436 2024 28,211 — 482 821 2025 20,275 — 324 612 Thereafter 47,358 — — — Total lease payments $ 261,258 $ 125 $ 2,623 $ 8,702 Less: Interest (22,302) (11) (189) (375) Present value of lease liabilities $ 238,956 $ 114 $ 2,434 $ 8,327

Derivatives and Hedging (Tables

Derivatives and Hedging (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of fair values of derivatives designated as hedging instruments under ASC 815	The fair values of derivatives designated as hedging instruments follows: Asset Derivatives Liability Derivatives (in thousands) Balance Sheet December 31, 2020 December 31, 2019 Balance Sheet December 31, 2020 December 31, 2019 Foreign currency contracts Other current assets $ 20,004 $ 2,871 Other accrued liabilities $ 4 $ 1,585 Commodity contracts Other current assets — 10 Other accrued liabilities — — Foreign currency contracts Other assets 2,184 3,757 Noncurrent liabilities 25 4,747 Total $ 22,188 $ 6,638 $ 29 $ 6,332
Schedule of derivative instrument gain (loss)	The after-tax amount of gain (loss) recognized in OCI and reclassified from AOCI into earnings associated with derivative instruments designated as cash flow hedges follows: After-Tax Amount of Gain After-Tax Amount of Gain Cash Flow Hedges (in thousands) 2020 2019 2018 Location of Gain (Loss) 2020 2019 2018 Foreign currency contracts $ 19,608 $ 1,043 $ (5,207) Cost of revenue $ 2,382 $ (1,041) $ (4,432) Commodity contracts (107) 460 — Cost of revenue (100) 453 — Interest rate contracts — — — Interest expense (1,678) (1,049) (1,049) Total $ 19,501 $ 1,503 $ (5,207) $ 604 $ (1,637) $ (5,481)

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
Schedule of tax effects of components of other comprehensive income (loss)	The components of OCI follow: Year Ended December 31, 2020 2019 2018 (in thousands) Before-Tax Tax Net-of-Tax Before-Tax Tax Net-of-Tax Before-Tax Tax Net-of-Tax OCI: Foreign currency translation adjustments $ (17,127) $ — $ (17,127) $ 101,096 $ (35,596) $ 65,500 $ (116,775) $ 16,214 $ (100,561) Ownership share of equity method investees' OCI (21,837) 3,309 (18,528) (15,630) 3,846 (11,784) 12,118 (3,176) 8,942 DB plan adjustments (19,392) — (19,392) 150,427 (44,975) 105,452 (59,920) 7,329 (52,591) Unrealized gain (loss) on hedges 23,531 (4,634) 18,897 4,734 (1,594) 3,140 1,490 (1,216) 274 Unrealized gain (loss) on available-for-sale securities — — — — — — 1,134 (425) 709 Total OCI (34,825) (1,325) (36,150) 240,627 (78,319) 162,308 (161,953) 18,726 (143,227) Less: OCI attributable to NCI 883 — 883 (1,350) — (1,350) (2,239) — (2,239) OCI attributable to Fluor Corporation $ (35,708) $ (1,325) $ (37,033) $ 241,977 $ (78,319) $ 163,658 $ (159,714) $ 18,726 $ (140,988)
Schedule of changes in AOCI balances by component (after-tax)	The changes in AOCI balances follow: (in thousands) Foreign Ownership DB Unrealized AOCI, Net Attributable to Fluor Corporation: Balance as of December 31, 2019 $ (242,950) $ (35,456) $ (99,197) $ (2,270) $ (379,873) OCI before reclassifications (18,010) (19,076) (22,921) 19,501 (40,506) Amounts reclassified from AOCI — 548 3,529 (604) 3,473 Net OCI (18,010) (18,528) (19,392) 18,897 (37,033) Balance as of December 31, 2020 $ (260,960) $ (53,984) $ (118,589) $ 16,627 $ (416,906) Attributable to NCI: Balance as of December 31, 2019 $ (5,051) $ — $ — $ — $ (5,051) OCI before reclassifications 883 — — — 883 Amount reclassified from AOCI — — — — — Net OCI 883 — — — 883 Balance as of December 31, 2020 $ (4,168) $ — $ — $ — $ (4,168) (in thousands) Foreign Ownership DB Unrealized Gain (Loss) on Hedges AOCI, Net Attributable to Fluor Corporation: Balance as of December 31, 2018 $ (309,800) $ (23,672) $ (204,649) $ (5,410) $ (543,531) OCI before reclassifications 19,957 (12,304) 4,006 1,503 13,162 Amounts reclassified from AOCI 46,893 520 101,446 1,637 150,496 Net OCI 66,850 (11,784) 105,452 3,140 163,658 Balance as of December 31, 2019 $ (242,950) $ (35,456) $ (99,197) $ (2,270) $ (379,873) Attributable to NCI: Balance as of December 31, 2018 $ (3,701) $ — $ — $ — $ (3,701) OCI before reclassifications (1,350) — — — (1,350) Amount reclassified from AOCI — — — — — Net OCI (1,350) — — — (1,350) Balance as of December 31, 2019 $ (5,051) $ — $ — $ — $ (5,051) (in thousands) Foreign Ownership DB Unrealized Unrealized AOCI, Net Attributable to Fluor Corporation: Balance as of December 31, 2017 $ (211,478) $ (32,614) $ (152,058) $ (5,684) $ (709) $ (402,543) OCI before reclassifications (98,322) 7,986 (77,209) (5,207) — (172,752) Amounts reclassified from AOCI — 956 24,618 5,481 709 31,764 Net OCI (98,322) 8,942 (52,591) 274 709 (140,988) Balance as of December 31, 2018 $ (309,800) $ (23,672) $ (204,649) $ (5,410) $ — $ (543,531) Attributable to NCI: Balance as of December 31, 2017 $ (1,462) $ — $ — $ — $ — $ (1,462) OCI before reclassifications (2,239) — — — — (2,239) Amount reclassified from AOCI — — — — — — Net OCI (2,239) — — — — (2,239) Balance as of December 31, 2018 $ (3,701) $ — $ — $ — $ — $ (3,701)
Schedule of significant items reclassified out of accumulated other comprehensive income (loss)	The reclassifications out of AOCI follow: Location in Consolidated Year Ended December 31, (in thousands) 2020 2019 2018 Component of AOCI: Foreign currency translation adjustment Impairment, restructuring & other exit costs $ — $ (84,286) $ — Income tax benefit Income tax expense (benefit) — 37,393 — Net of tax $ — $ (46,893) $ — Ownership share of equity method investees' OCI Cost of revenue $ (730) $ (695) $ (1,297) Income tax benefit Income tax expense (benefit) 182 175 341 Net of tax $ (548) $ (520) $ (956) DB plan adjustments Various accounts (1) $ (3,529) $ (146,579) $ (28,730) Income tax benefit Income tax expense (benefit) — 45,133 4,112 Net of tax $ (3,529) $ (101,446) $ (24,618) Unrealized gain (loss) on hedges: Commodity and foreign currency contracts Various accounts (2) $ 1,837 $ (1,370) $ (6,540) Interest rate contracts Interest expense (1,678) (1,678) (1,678) Income tax benefit Income tax expense (benefit) 445 1,411 2,737 Net of tax: $ 604 $ (1,637) $ (5,481) Unrealized loss on available-for-sale securities Corporate G&A $ — $ — $ (1,134) Income tax benefit Income tax expense (benefit) — — 425 Net of tax $ — $ — $ (709) (1) DB plan adjustments were reclassified to "Corporate G&A" and "Loss on pension settlement". (2) Gains and losses on commodity and foreign currency derivatives were reclassified to "Cost of revenue" and "Corporate G&A".

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
Earnings from discontinued operations, net of tax	Disc Ops information follows: Year Ended December 31, 2020 Year Ended December 31, 2019 Year Ended December 31, 2018 (in thousands) AMECO Other Total AMECO Other Total AMECO Other Total Revenue $ 215,684 $ — $ 215,684 $ 260,276 $ — $ 260,276 $ 253,130 $ — $ 253,130 Cost of revenue 193,583 — 193,583 277,420 — 277,420 222,139 — 222,139 Corporate general and administrative expense 234 13,198 13,432 239 (21,152) (20,913) 282 4,792 5,074 Impairment of assets held for sale 145,700 — 145,700 — — — — — — Interest expense (income), net 159 — 159 (341) — (341) (354) — (354) Total cost and expenses 339,676 13,198 352,874 277,318 (21,152) 256,166 222,067 4,792 226,859 Earnings (loss) before taxes from Disc Ops (123,992) (13,198) (137,190) (17,042) 21,152 4,110 31,063 (4,792) 26,271 Income tax expense (benefit) 3,957 — 3,957 (3,940) 4,447 507 6,900 (1,064) 5,836 Net earnings (loss) from Disc Ops $ (127,949) $ (13,198) $ (141,147) $ (13,102) $ 16,705 $ 3,603 $ 24,163 $ (3,728) $ 20,435
Assets and liabilities held for sale	The following summarizes information related to assets and liabilities classified as held for sale: December 31, 2020 December 31, 2019 (in thousands) AMECO Other Total from Discontinued Operations Other Assets and Liabilities from Continuing Operations Total AMECO Other Total from Discontinued Operations Other Assets and Liabilities from Continuing Operations Total Accounts and notes receivable, net $41,988 $10,476 $52,464 $64 $52,528 $69,126 $15,925 $85,051 $17,513 $102,564 Contract assets 2,188 — 2,188 — 2,188 3,497 — 3,497 3,779 7,276 Other current assets 7,098 — 7,098 2,712 9,810 54,116 — 54,116 8,112 62,228 Current assets held for sale 51,274 10,476 61,750 2,776 64,526 126,739 15,925 142,664 29,404 172,068 Property, plant and equipment, net 113,080 — 113,080 41,160 154,240 232,792 — 232,792 64,792 297,584 Goodwill — — — — — 12,338 — 12,338 9,295 21,633 Investments — — — 5,063 5,063 — — — 7,293 7,293 Other assets 13,788 — 13,788 — 13,788 5,868 — 5,868 12,654 18,522 Noncurrent assets held for sale (1) 126,868 — 126,868 46,223 173,091 250,998 — 250,998 94,034 345,032 Total assets held for sale $178,142 $10,476 $188,618 $48,999 $237,617 $377,737 $15,925 $393,662 $123,438 $517,100 Accounts payable $17,355 $ 13 $17,368 $75 $17,443 $24,692 $ — $24,692 $6,702 $31,394 Contract liabilities 125 — 125 10 135 4,466 — 4,466 25 4,491 Accrued salaries, wages and benefits 6,042 — 6,042 98 6,140 8,913 — 8,913 919 9,832 Other accrued liabilities 11,780 — 11,780 327 12,107 9,451 — 9,451 11,562 21,013 Current liabilities held for sale 35,302 13 35,315 510 35,825 47,522 — 47,522 19,208 66,730 Noncurrent liabilities held for sale (1) 9,479 — 9,479 — 9,479 4,272 — 4,272 11,320 15,592 Total liabilities held for sale $44,781 $13 $44,794 $510 $45,304 $51,794 $ — $51,794 $30,528 $82,322 (1) Noncurrent assets and liabilities held for sale were classified as current as we expect to complete the sale of the AMECO businesses within the first half of 2021.
Consolidated statements of cash flows for the discontinued operations	The changes in assets and liabilities included in operating cash flow follow: Year Ended December 31, (in thousands) 2020 2019 2018 (Increase) decrease in: Accounts and notes receivable, net $ 138,388 $ 210,419 $ (40,632) Contract assets 280,360 207,467 (83,774) Other current assets 3,893 (80,248) 168,021 Other assets 109,405 100,527 (25,424) Increase (decrease) in: Accounts payable (343,113) (46,873) 176,335 Contract liabilities (53,580) 202,359 (307,844) Accrued liabilities (11,829) 29,880 (75,878) Other liabilities (93,723) 9,496 (38,536) Increase (decrease) in cash due to changes in assets and liabilities $ 29,801 $ 633,027 $ (227,732) Cash paid during the year for: Interest $ 65,641 $ 71,938 $ 66,514 Income taxes (net of refunds) 65,188 204,080 (28,408) Year Ended December 31, (in thousands) 2020 2019 2018 Impairment expense - Disc Ops $ 145,700 $ — $ — Depreciation of fixed assets — 44,295 72,137 Amortization of stock-based awards 56 123 103 Capital expenditures (23,430) (68,048) (40,856)

Quarterly Financial Data (Una_2

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Summary of quarterly results of operations	(in millions, except per share amounts) First Quarter Second Quarter Third Quarter Fourth Quarter Year ended December 31, 2020 Revenue $ 4,118.6 $ 4,091.0 $ 3,803.2 $ 3,655.7 Cost of revenue 4,057.2 4,023.5 3,669.5 3,533.0 Earnings (loss) from Cont Ops before taxes (228.4) 10.9 52.2 (41.7) Net earnings (loss) from Cont Ops (161.6) (20.2) 23.4 (67.2) Amounts attributable to Fluor Corporation: Net earnings (loss) from Cont Ops (171.1) (26.9) 19.1 (115.0) Net earnings (loss) from Disc Ops (94.9) 1.9 0.2 (48.3) Net earnings (loss) $ (266.0) $ (25.0) $ 19.3 $ (163.3) Basic earnings (loss) per share attributable to Fluor Corporation: Net earnings (loss) from Cont Ops $ (1.22) $ (0.19) $ 0.14 $ (0.82) Net earnings (loss) from Disc Ops (0.68) 0.01 — (0.34) Net earnings (loss) $ (1.90) $ (0.18) $ 0.14 $ (1.16) Diluted earnings (loss) per share attributable to Fluor Corporation: Net earnings (loss) from Cont Ops $ (1.22) $ (0.19) $ 0.14 $ (0.82) Net earnings (loss) from Disc Ops (0.68) 0.01 — (0.34) Net earnings (loss) $ (1.90) $ (0.18) $ 0.14 $ (1.16) (in millions, except per share amounts) First Quarter Second Quarter Third Quarter Fourth Quarter Year ended December 31, 2019 Revenue $ 4,133.6 $ 4,146.4 $ 4,628.6 $ 4,408.7 Cost of revenue 4,070.9 4,577.6 4,537.3 4,348.0 Earnings (loss) from Cont Ops before taxes (29.0) (511.9) (258.8) (271.8) Net earnings (loss) from Cont Ops (44.2) (436.1) (754.1) (322.3) Amounts attributable to Fluor Corporation: Net earnings (loss) from Cont Ops (68.1) (397.4) (766.6) (293.7) Net earnings (loss) from Disc Ops (0.8) (16.6) 23.5 (2.5) Net earnings (loss) $ (68.9) $ (414.0) $ (743.1) $ (296.2) Basic earnings (loss) per share attributable to Fluor Corporation: Net earnings (loss) from Cont Ops $ (0.49) $ (2.84) $ (5.47) $ (2.10) Net earnings (loss) from Disc Ops — (0.11) 0.17 (0.01) Net earnings (loss) $ (0.49) $ (2.95) $ (5.30) $ (2.11) Diluted earnings (loss) per share attributable to Fluor Corporation: Net earnings (loss) from Cont Ops $ (0.49) $ (2.84) $ (5.47) $ (2.10) Net earnings (loss) from Disc Ops — (0.11) 0.17 (0.01) Net earnings (loss) $ (0.49) $ (2.95) $ (5.30) $ (2.11)

Description of Business (Detail

Description of Business (Details)	12 Months Ended
	Dec. 31, 2020projectsegment
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of reportable segments | segment	6
NuScale
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of projects | project	2

Significant Accounting Polici_4

Significant Accounting Policies - Revenue Recognition (Details)	12 Months Ended
	Dec. 31, 2020yr
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
RUPO maintenance contracts, number of additional years recognized	3
Contract assets, incurred costs, billing and collection, period	1 year
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Customer payments on engineering and construction contracts, period until due	30 days
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Customer payments on engineering and construction contracts, period until due	45 days

Significant Accounting Polici_5

Significant Accounting Policies - Schedule of Useful Lives (Details)	12 Months Ended
	Dec. 31, 2020
Minimum
Property plant and equipment
Operating lease, term of contract	12 months
Minimum | Buildings
Property plant and equipment
Useful life	20 years
Minimum | Building and leasehold improvements
Property plant and equipment
Useful life	6 years
Minimum | Machinery and equipment
Property plant and equipment
Useful life	2 years
Minimum | Furniture and fixtures
Property plant and equipment
Useful life	2 years
Maximum
Property plant and equipment
Operating lease, term of contract	10 years
Maximum | Buildings
Property plant and equipment
Useful life	40 years
Maximum | Building and leasehold improvements
Property plant and equipment
Useful life	20 years
Maximum | Machinery and equipment
Property plant and equipment
Useful life	10 years
Maximum | Furniture and fixtures
Property plant and equipment
Useful life	10 years

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Gain Contingencies [Line Items]
Allowance for credit loss	$ 39,000		$ 35,000
Decrease in retained earnings	$ (1,249,809)		$ (1,700,912)
Retained Earnings | Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
Gain Contingencies [Line Items]
Allowance for credit loss		$ 2,000
Decrease in retained earnings		$ 2,000

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amounts attributable to Fluor Corporation:
Net earnings (loss) attributable to Fluor Corporation from Cont Ops	$ (115,000)	$ 19,100	$ (26,900)	$ (171,100)	$ (293,700)	$ (766,600)	$ (397,400)	$ (68,100)	$ (293,899)	$ (1,525,767)	$ 153,033
Net earnings (loss) from Disc Ops	(48,300)	200	1,900	(94,900)	(2,500)	23,500	(16,600)	(800)	(141,147)	3,603	20,435
NET EARNINGS (LOSS) ATTRIBUTABLE TO FLUOR CORPORATION	$ (163,300)	$ 19,300	$ (25,000)	$ (266,000)	$ (296,200)	$ (743,100)	$ (414,000)	$ (68,900)	$ (435,046)	$ (1,522,164)	$ 173,468
Basic EPS attributable to Fluor Corporation:
Weighted average common shares outstanding (in shares)									140,511	140,061	140,413
Net earnings (loss) from continuing operations (in dollars per share)	$ (0.82)	$ 0.14	$ (0.19)	$ (1.22)	$ (2.10)	$ (5.47)	$ (2.84)	$ (0.49)	$ (2.09)	$ (10.89)	$ 1.09
Net earnings from discontinued operations (in dollars per share)	(0.34)	0	0.01	(0.68)	(0.01)	0.17	(0.11)	0	(1.01)	0.02	0.15
Net earnings (loss) (in dollars per share)	(1.16)	0.14	(0.18)	(1.90)	(2.11)	(5.30)	(2.95)	(0.49)	$ (3.10)	$ (10.87)	$ 1.24
Diluted EPS attributable to Fluor Corporation:
Weighted average common shares outstanding (in shares)									140,511	140,061	140,413
Employee stock options, restricted stock units and shares and Value Driver Incentive units (in shares)									0	0	859
Weighted average diluted shares outstanding (in shares)									140,511	140,061	141,272
Net earnings (loss) from continuing operations (in dollars per share)	(0.82)	0.14	(0.19)	(1.22)	(2.10)	(5.47)	(2.84)	(0.49)	$ (2.09)	$ (10.89)	$ 1.08
Net earnings from discontinued operations (in dollars per share)	(0.34)	0	0.01	(0.68)	(0.01)	0.17	(0.11)	0	(1.01)	0.02	0.15
Net earnings (loss) (in dollars per share)	$ (1.16)	$ 0.14	$ (0.18)	$ (1.90)	$ (2.11)	$ (5.30)	$ (2.95)	$ (0.49)	$ (3.10)	$ (10.87)	$ 1.23
Anti-dilutive securities not included above (in dollars per share)									709	593	0
Shares repurchased and canceled (in shares)											1,100
Payments to repurchase and cancel shares											$ 50,022

Earnings Per Share (Limited Dur

Earnings Per Share (Limited Duration Stockholder Rights Agreement) (Details) - $ / shares	Mar. 24, 2020	Mar. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Preferred stock dividend (in shares)		1
Preferred share purchase right, percent of common stock acquired, initial trigger	10.00%
Preferred share purchase right, percent of common stock acquired, BOD option trigger	50.00%
Junior Participating Preferred Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Share price (in dollars per share)	$ 50
Number of share purchase rights per share		$ 0.001
Board of directors | Junior Participating Preferred Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Number of share purchase rights per share	1
Redemption price per share (in dollars per share)	$ 0.01

Operating Information by Segm_3

Operating Information by Segment and Geographic Area - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2020USD ($)project	Dec. 31, 2019USD ($)projectsubcontract$ / shares	Dec. 31, 2018USD ($)$ / shares
Segment Reporting Information [Line Items]
Charges from write-off of pre-contract costs							$ 26,000
Charges from write-off of embedded foreign currency derivatives										$ 26,000
Charges from write-off of embedded foreign currency derivatives (in dollars per share) | $ / shares										$ 0.19
Effect of forecast revision on estimated project cost						$ 59,000
Gain (loss) on sale of interest in joint venture (in dollars per share) | $ / shares											$ 0.74
Gains related to favorable dispute resolution						18,000	13,000
Revenue	$ 3,655,700	$ 3,803,200	$ 4,091,000	$ 4,118,600	$ 4,408,700	$ 4,628,600	$ 4,146,400	$ 4,133,600	$ 15,668,477	$ 17,317,284	$ 18,851,008
North America
Segment Reporting Information [Line Items]
Revenue									9,806,400	$ 8,439,700	8,982,100
Energy & Chemicals
Segment Reporting Information [Line Items]
Recognition of reserves for expected credit losses									60,000
Effect on segment profit											$ 40,000
Effect on segment profit (in dollars per share) | $ / shares											$ 0.23
Number of projects | project										2
Change in cost and schedule impacts										$ 87,000	$ 133,000
Change in cost and schedule impacts (in dollars per share) | $ / shares										$ 0.62	$ 0.89
Energy & Chemicals | Forecast revisions resulting from late design changes, schedule-driven cost growth, and subcontractor negotiations | North America
Segment Reporting Information [Line Items]
Pre-tax charges associated with forecast revisions										$ 260,000
Pre-tax charges adversely affecting earnings before taxes (in dollars per share) | $ / shares										$ 1.85
Energy & Chemicals | Write-off of pre-contract costs
Segment Reporting Information [Line Items]
Charges from write-off of pre-contract costs										$ 26,000
Charges from write-off of pre-contract costs (in dollars per share) | $ / shares										$ 190,000
Energy & Chemicals | Close-out matters
Segment Reporting Information [Line Items]
Pre-tax charges associated with forecast revisions										$ 31,000
Pre-tax charges adversely affecting earnings before taxes (in dollars per share) | $ / shares										$ 0.22
Mining & Industrial
Segment Reporting Information [Line Items]
Gains related to favorable dispute resolution										$ (31,000)
Gains related to favorable dispute resolution (in dollars per share) | $ / shares										$ 0.16
Infrastructure & Power
Segment Reporting Information [Line Items]
Number of projects | project										3
Infrastructure & Power | Settlement of client disputes as well as cost growth related to close-out matters
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost										$ 135,000
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares										$ 0.96
Gain (loss) on sale of interest in joint venture											$ 125,000
Infrastructure & Power | Late engineering changes
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost										$ 133,000
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares										$ 0.95
Infrastructure & Power | Estimated cost growth
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost											$ 188,000
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares											$ 1.02
Government | South Carolina and Georgia
Segment Reporting Information [Line Items]
Number of subcontracts cancelled | subcontract										2
Derecognition of accounts receivable										$ 68,000
Derecognition of revenue										89,000
Diversified Services
Segment Reporting Information [Line Items]
Revenue									270,000	322,000	$ 332,000
Other | Warren project
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost										$ 59,000
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares										$ 0.42
Other | Radford project
Segment Reporting Information [Line Items]
Effect of forecast revision on estimated project cost									$ 0	$ 83,000	$ 56,000
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares										$ 0.59	$ 0.30
Pending litigation | Energy & Chemicals | Unapproved change orders
Segment Reporting Information [Line Items]
Number of projects | project									2
Unapproved change orders for cost growth and extension of time due to client delays	66,000								$ 66,000
Estimate of possible loss	$ 121,000								$ 121,000
Customer concentration | Consolidated revenue | Government
Segment Reporting Information [Line Items]
Concentration risk (as a percentage)									18.00%	15.00%	18.00%
Customer concentration | Single customer | Consolidated revenue | Energy & Chemicals
Segment Reporting Information [Line Items]
Concentration risk (as a percentage)									12.00%	11.00%	18.00%
NuScale | Other
Segment Reporting Information [Line Items]
Research and development activities									$ 84,000	$ 66,000	$ 74,000
Corporate general and administrative expense
Segment Reporting Information [Line Items]
Foreign currency exchange gains (losses)									47,000	27,000	(33,000)
DOE | NuScale | Other
Segment Reporting Information [Line Items]
Net of qualified reimbursable expenses									$ 71,000	$ 56,000	$ 62,000

Operating Information by Segm_4

Operating Information by Segment and Geographic Area - External Revenue and Segment Profit (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment reporting information
Revenue	$ 3,655,700	$ 3,803,200	$ 4,091,000	$ 4,118,600	$ 4,408,700	$ 4,628,600	$ 4,146,400	$ 4,133,600	$ 15,668,477	$ 17,317,284	$ 18,851,008
Segment profit (loss)									317,000	(185,600)	510,000
Depreciation (all but Corporate included in segment profit)									102,451	154,599	197,585
Capital expenditures									113,442	180,842	210,998
Total assets	7,309,812				7,966,658				7,309,812	7,966,658
Goodwill	349,258				508,415				349,258	508,415
Continuing Operations
Segment reporting information
Depreciation (all but Corporate included in segment profit)									102,500	110,300	125,400
Capital expenditures									90,000	112,800	170,100
Discontinued Operations - Assets held for sale	48,999				123,438				48,999	123,438
Discontinued Operations
Segment reporting information
Depreciation (all but Corporate included in segment profit)										44,000	72,000
Discontinued Operations - Assets held for sale	188,618				393,662				188,618	393,662
Capital Expenditure, Discontinued Operations									(23,000)	(68,000)	(41,000)
Reportable segments
Segment reporting information
Goodwill	349,300				508,400				349,300	508,400
Reportable segments | Continuing Operations
Segment reporting information
Revenue									15,668,500	17,317,300	18,851,000
Segment profit (loss)									317,000	(185,600)	510,000
Corporate
Segment reporting information
Total assets	3,574,700				3,379,300				3,574,700	3,379,300
Corporate | Continuing Operations
Segment reporting information
Depreciation (all but Corporate included in segment profit)									64,900	61,700	59,800
Capital expenditures									30,000	62,500	90,000
Energy & Chemicals | Reportable segments
Segment reporting information
Total assets	1,004,600				1,139,300				1,004,600	1,139,300
Goodwill	12,600				12,600				12,600	12,600
Energy & Chemicals | Reportable segments | Continuing Operations
Segment reporting information
Revenue									5,260,400	5,823,700	7,695,500
Segment profit (loss)									163,700	(95,000)	334,500
Depreciation (all but Corporate included in segment profit)									0	0	0
Capital expenditures									0	0	0
Mining & Industrial | Reportable segments
Segment reporting information
Total assets	508,500				594,900				508,500	594,900
Goodwill	9,200				8,200				9,200	8,200
Mining & Industrial | Reportable segments | Continuing Operations
Segment reporting information
Revenue									4,149,100	5,057,200	3,491,000
Segment profit (loss)									122,400	158,500	94,300
Depreciation (all but Corporate included in segment profit)									0	0	0
Capital expenditures									0	0	0
Infrastructure & Power | Reportable segments
Segment reporting information
Total assets	469,300				471,300				469,300	471,300
Goodwill	2,500				2,500				2,500	2,500
Infrastructure & Power | Reportable segments | Continuing Operations
Segment reporting information
Revenue									1,595,500	1,370,400	1,668,000
Segment profit (loss)									13,700	(243,900)	(30,100)
Depreciation (all but Corporate included in segment profit)									10,000	7,300	6,700
Capital expenditures									28,800	12,200	24,500
Government | Reportable segments
Segment reporting information
Revenue									2,922,800	2,969,300	3,678,500
Total assets	575,400				629,100				575,400	629,100
Goodwill	58,000				58,000				58,000	58,000
Government | Reportable segments | Continuing Operations
Segment reporting information
Segment profit (loss)									88,400	200,300	187,300
Depreciation (all but Corporate included in segment profit)									4,000	4,000	3,600
Capital expenditures									3,200	3,000	6,900
Diversified Services
Segment reporting information
Revenue									270,000	322,000	332,000
Diversified Services | Reportable segments
Segment reporting information
Total assets	950,600				1,290,600				950,600	1,290,600
Goodwill	260,800				420,900				260,800	420,900
Diversified Services | Reportable segments | Continuing Operations
Segment reporting information
Revenue									1,630,900	2,040,100	2,257,200
Segment profit (loss)									14,200	14,600	68,700
Depreciation (all but Corporate included in segment profit)									21,900	34,500	52,100
Capital expenditures									24,600	33,600	46,900
Other | Reportable segments
Segment reporting information
Total assets	38,100				68,500				38,100	68,500
Goodwill	$ 6,200				$ 6,200				6,200	6,200
Other | Reportable segments | Continuing Operations
Segment reporting information
Revenue									109,800	56,600	60,800
Segment profit (loss)									(85,400)	(220,100)	(144,700)
Depreciation (all but Corporate included in segment profit)									1,700	2,800	3,200
Capital expenditures									$ 3,400	$ 1,500	$ 1,800

Operating Information by Segm_5

Operating Information by Segment and Geographic Area - Reconciliation to Consolidated Amounts (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting [Abstract]
Total segment profit (loss)									$ 317,000	$ (185,600)	$ 510,000
Corporate general and administrative expense									(240,692)	(165,921)	(121,164)
Impairment, restructuring and other exit costs					$ (145,000)	$ (334,000)	$ (27,000)	$ (27,000)	(305,590)	(532,600)	0
Gain (loss) on pension settlement					(138,000)				400	(137,900)	(21,900)
Interest income (expense), net									(46,400)	(18,500)	(40,600)
Earnings (loss) attributable to NCI from continuing operations									68,200	(31,000)	59,400
Earnings (loss) from Cont Ops before taxes	$ (41,700)	$ 52,200	$ 10,900	$ (228,400)	$ (271,800)	$ (258,800)	$ (511,900)	$ (29,000)	$ (207,052)	$ (1,071,495)	$ 385,749

Operating Information by Segm_6

Operating Information by Segment and Geographic Area - External Revenue and Total Assets by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 3,655,700	$ 3,803,200	$ 4,091,000	$ 4,118,600	$ 4,408,700	$ 4,628,600	$ 4,146,400	$ 4,133,600	$ 15,668,477	$ 17,317,284	$ 18,851,008
Total assets	7,309,812				7,966,658				7,309,812	7,966,658
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									9,806,400	8,439,700	8,982,100
Total assets	3,982,400				3,728,800				3,982,400	3,728,800
Asia Pacific (includes Australia)
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,398,200	1,763,300	1,494,000
Total assets	562,100				533,700				562,100	533,700
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									2,517,500	3,731,600	5,326,600
Total assets	1,403,900				1,906,900				1,403,900	1,906,900
Central and South America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,388,100	2,375,300	1,262,600
Total assets	812,800				1,233,600				812,800	1,233,600
Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									558,300	1,007,400	$ 1,785,700
Total assets	$ 548,600				$ 563,700				$ 548,600	$ 563,700

Impairment, Restructuring and_3

Impairment, Restructuring and Other Exit Costs - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring [Line Items]
Severance	$ 6.6	$ 63.9
Fair value of other impaired assets		25
Restructuring Costs	8	240
Level 3 | Investments
Restructuring [Line Items]
Carrying value of investments		95
Customer relationships
Restructuring [Line Items]
Impairment loss on intangible assets	27	34
Customer relationships | Other assets | Rationalization of Resources, Investments, Real Estate and Overhead Across Various Geographies
Restructuring [Line Items]
Impairment loss on intangible assets	$ 31
Customer relationships | Level 3 | Measurement Input, Weighted Average Long-term Revenue Growth Rate
Restructuring [Line Items]
Measurement input	2.40%
Customer relationships | Level 3 | Measurement Input, Weighted Average Cost of Capital
Restructuring [Line Items]
Measurement input	12.00%
Customer relationships | Level 3 | Measurement Input, Customer Attrition Factor
Restructuring [Line Items]
Measurement input	10.00%
Customer relationships | Minimum | Level 3 | Measurement Input, Long-term Revenue Growth Rate
Restructuring [Line Items]
Measurement input	2.00%
Customer relationships | Maximum | Level 3 | Measurement Input, Long-term Revenue Growth Rate
Restructuring [Line Items]
Measurement input	5.50%
AMECO
Restructuring [Line Items]
Restructuring Costs	$ 8	$ 240

Impairment, Restructuring and_4

Impairment, Restructuring and Other Exit Costs - Restructuring Costs (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Restructuring and other exit costs:
Severance		$ 6.6	$ 63.9
Asset impairments	$ 298	0.4	90.4
Entity liquidation costs (including the recognition of cumulative translation adjustments)		0	83.7
Other exit costs		1	2
Total restructuring and other exit costs		$ 8	$ 240

Impairment, Restructuring and_5

Impairment, Restructuring and Other Exit Costs - Restructuring Liability (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Reserve
Restructuring charges accrued during the period	$ 145,000	$ 334,000	$ 27,000	$ 27,000	$ 305,590	$ 532,600	$ 0
Total
Restructuring Reserve
Beginning balance					47,180
Restructuring charges accrued during the period					7,986
Cash payments / settlements during the period					(34,084)
Currency translation					2,282
Ending balance	47,180				23,364	47,180
Severance
Restructuring Reserve
Beginning balance					46,303
Restructuring charges accrued during the period					6,965
Cash payments / settlements during the period					(32,292)
Currency translation					2,282
Ending balance	46,303				23,258	46,303
Lease Exit Costs
Restructuring Reserve
Beginning balance					570
Restructuring charges accrued during the period					334
Cash payments / settlements during the period					(799)
Currency translation					1
Ending balance	570				106	570
Other
Restructuring Reserve
Beginning balance					307
Restructuring charges accrued during the period					687
Cash payments / settlements during the period					(993)
Currency translation					(1)
Ending balance	$ 307				$ 0	$ 307

Impairment, Restructuring and_6

Impairment, Restructuring and Other Exit Costs - Schedule of Impairment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring [Line Items]
Goodwill impairment	$ 169,000
Total impairment expense	297,604	$ 292,551
Diversified Services
Restructuring [Line Items]
Goodwill impairment	168,568	2,125
Stork Holding B.V.
Restructuring [Line Items]
Intangible customer relationships associated with the Stork business	26,671	33,657
Energy & Chemicals
Restructuring [Line Items]
Equity Method Investment, Other than Temporary Impairment	86,096	256,769
Technology-Based Intangible Assets
Restructuring [Line Items]
Impairment loss on intangible assets	$ 16,269	$ 0

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Income Tax Contingency [Line Items]
Discrete benefit from net operating loss carryback from CARES Act					$ 125,000
Deferred payroll tax liability from CARES Act			$ 41,000
Deferred tax liabilities which have not been recorded with respect to unremitted earnings that are considered indefinitely reinvested			28,000
U.S. foreign tax credits	$ 226,845		414,348	$ 226,845
Charge to tax expense to record valuation allowance	(185,000)	$ (546,000)
Unrecognized tax benefits that, if recognized, would have favorably impacted effective tax rates	22,000		30,000	22,000
Accrued interest and penalties	$ 10,000		11,000	10,000
Domestic
Income Tax Contingency [Line Items]
Net operating loss carryforwards related to various jurisdictions			159,000
Charge to tax expense to record valuation allowance			142,000	602,000
Foreign
Income Tax Contingency [Line Items]
Net operating loss carryforwards related to various jurisdictions			1,200,000
Net operating loss carryforwards, with expiration			296,000
Net operating loss carryforwards, able to be carried forward indefinitely			800,000
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforwards related to various jurisdictions			908,000
Net operating loss carryforwards, with expiration			117,000
Netherlands and Belgium
Income Tax Contingency [Line Items]
Charge to tax expense to record valuation allowance				$ 129,000
Netherlands and Belgium | Foreign
Income Tax Contingency [Line Items]
Charge to tax expense to record valuation allowance			28,000
United Kingdom | Foreign
Income Tax Contingency [Line Items]
Net operating loss carryforwards related to various jurisdictions			599,000
Netherlands | Foreign
Income Tax Contingency [Line Items]
Net operating loss carryforwards related to various jurisdictions			$ 345,000

Income Taxes - Income Tax Expen

Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ (121,411)	$ (36,591)	$ (19,199)
Foreign	140,551	163,141	115,281
State and local	5,343	4,295	12,377
Total current	24,483	130,845	108,459
Deferred:
Federal	17,451	325,351	16,800
Foreign	(23,342)	9,593	55,208
State and local	0	19,441	(7,136)
Total deferred	(5,891)	354,385	64,872
Total income tax expense	$ 18,592	$ 485,230	$ 173,331

Income Taxes - U.S. Statutory F

Income Taxes - U.S. Statutory Federal Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. statutory federal tax expense (benefit)	$ (43,481)	$ (225,014)	$ 81,007
Increase (decrease) in taxes resulting from:
State and local income taxes	(10,614)	(11,135)	(13,668)
U.S. tax on GILTI	0	0	10,649
NCI	(9,466)	11,565	(7,200)
Foreign tax differential, net	38,667	13,479	1,460
Valuation allowance, net	148,783	730,787	79,168
Other changes to uncertain tax positions	7,484	4,098	7,753
Stranded tax effects from AOCI	0	(35,619)	0
Impact of tax reform	0	0	(1,373)
CARES Act Benefit	(124,753)	0	0
Other, net	11,972	(2,931)	15,535
Total income tax expense	$ 18,592	$ 485,230	$ 173,331

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accrued liabilities not currently deductible:
Employee compensation and benefits	$ 104,305	$ 116,162
Project and non-project reserves	71,999	60,768
Net operating loss carryforward	326,402	357,803
Tax basis of investment in excess of book basis	118,915	88,255
U.S. foreign tax credit carryforward	414,348	226,845
AOCI	62,681	67,258
Other	103,955	85,059
Total deferred tax assets	1,202,605	1,002,150
Valuation allowance	(1,080,752)	(910,336)
Deferred tax assets, net	121,853	91,814
Deferred tax liabilities:
Book basis of property and equipment in excess of tax basis	(43,475)	(29,846)
Dividend withholding on unremitted non-U.S. earnings	(57,859)	(49,663)
Other	(23,349)	(32,912)
Total deferred tax liabilities	(124,683)	(112,421)
Deferred tax assets, net of deferred tax liabilities	$ (2,830)	$ (20,607)

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning of year	$ 42,394	$ 55,476
Change in tax positions of prior years	8,166	6,359
Change in tax positions of current year	0	0
Reduction in tax positions for statute expirations	(1,510)	(16,894)
Reduction in tax positions for audit settlements	(637)	(2,547)
Balance at end of year	$ 48,413	$ 42,394

Income Taxes - U.S. and Foreign

Income Taxes - U.S. and Foreign Earnings from Continuing Operations before Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States									$ (265,682)	$ (968,280)	$ (252,376)
Foreign									58,630	(103,215)	638,125
Earnings (loss) from Cont Ops before taxes	$ (41,700)	$ 52,200	$ 10,900	$ (228,400)	$ (271,800)	$ (258,800)	$ (511,900)	$ (29,000)	$ (207,052)	$ (1,071,495)	$ 385,749

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
(Increase) decrease in:
Accounts and notes receivable, net	$ 138,388	$ 210,419	$ (40,632)
Contract assets	280,360	207,467	(83,774)
Other current assets	3,893	(80,248)	168,021
Other assets	109,405	100,527	(25,424)
Increase (decrease) in:
Accounts payable	(343,113)	(46,873)	176,335
Contract liabilities	(53,580)	202,359	(307,844)
Accrued liabilities	(11,829)	29,880	(75,878)
Other liabilities	(93,723)	9,496	(38,536)
Increase (decrease) in cash due to changes in assets and liabilities	29,801	633,027	(227,732)
Cash paid during the year for:
Interest	65,641	71,938	66,514
Income taxes (net of refunds)	$ 65,188	$ 204,080	$ (28,408)

Partnerships and Joint Ventur_3

Partnerships and Joint Ventures - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)investment	Dec. 31, 2019USD ($)
Variable interest entity information
Asset impairments	$ 298	$ 0.4	$ 90.4
Number of joint ventures divested | investment		3
COOEC Fluor
Variable interest entity information
Future funding commitments		$ 26
COOEC Fluor
Variable interest entity information
Asset impairments		$ 86	257
Ownership interest (as a percent)		49.00%
Sacyr Fluor | Discontinued Operations, Disposed of by Sale | Energy & Chemicals
Variable interest entity information
Ownership interest (as a percent)		50.00%
Gain (loss) on sale of investments		$ (11)
Infrastructure Joint Venture | Discontinued Operations, Disposed of by Sale
Variable interest entity information
Gain (loss) on sale of investments		8
Variable Interest Entity, Not Primary Beneficiary | Accounts and notes receivable, net
Variable interest entity information
Receivables related to work performed		$ 218	$ 149
Fluor Corporation | Partnership | Majority
Variable interest entity information
Entity's interest (as a percent)		50.00%

Partnerships and Joint Ventur_4

Partnerships and Joint Ventures - Summary of Aggregate Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Current assets	$ 5,034,009				$ 5,366,763				$ 5,034,009	$ 5,366,763
Total noncurrent assets	2,275,803				2,599,895				2,275,803	2,599,895
Total current liabilities	3,572,037				3,905,122				3,572,037	3,905,122
Revenue	3,655,700	$ 3,803,200	$ 4,091,000	$ 4,118,600	4,408,700	$ 4,628,600	$ 4,146,400	$ 4,133,600	15,668,477	17,317,284	$ 18,851,008
Cost of revenue	3,533,000	3,669,500	4,023,500	4,057,200	4,348,000	4,537,300	4,577,600	4,070,900	15,283,226	17,533,864	18,281,628
Net earnings	(163,300)	$ 19,300	$ (25,000)	$ (266,000)	(296,200)	$ (743,100)	$ (414,000)	$ (68,900)	(435,046)	(1,522,164)	173,468
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Current assets	8,138,000				6,927,000				8,138,000	6,927,000
Total noncurrent assets	4,745,000				5,109,000				4,745,000	5,109,000
Total current liabilities	6,307,000				4,605,000				6,307,000	4,605,000
Noncurrent liabilities	$ 4,354,000				$ 5,256,000				4,354,000	5,256,000
Revenue									1,209,000	1,258,000	1,465,000
Cost of revenue									1,104,000	1,151,000	1,338,000
Net earnings									$ 54,000	$ 45,000	$ 35,000

Partnerships and Joint Ventur_5

Partnerships and Joint Ventures - Joint Venture Investment Agreement (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)
COOEC Fluor
Commitments
Ownership interest (as a percent)	49.00%
Sacyr Fluor | Discontinued Operations, Disposed of by Sale | Energy & Chemicals
Commitments
Ownership interest (as a percent)	50.00%
Gain (loss) on sale of investments	$ (11)
COOEC Fluor
Commitments
Future funding commitments	$ 26

Partnerships and Joint Ventur_6

Partnerships and Joint Ventures - Variable Interest Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Variable interest entity information
Assets	$ 7,309,812	$ 7,966,658
Variable Interest Entity, Primary Beneficiary
Variable interest entity information
Assets	1,300,000	1,100,000
Liabilities	703,000	798,000
Variable Interest Entity, Not Primary Beneficiary
Variable interest entity information
Net Assets	174,000	$ 217,000
Variable Interest Entity, Not Primary Beneficiary | Future funding commitment
Variable interest entity information
Future funding commitments	$ 72,000

Guarantees (Details)

Guarantees (Details) $ in Billions	Dec. 31, 2020USD ($)
Performance guarantees
Guarantor Obligations [Line Items]
Maximum payments required under performance guarantees	$ 14

Contingencies and Commitments (

Contingencies and Commitments (Details) $ in Millions, $ in Millions

Aug. 23, 2019USD ($)

Dec. 13, 2016AUD ($)

Dec. 31, 2020USD ($)

Sep. 30, 2018action

Sep. 30, 2019USD ($)

Jun. 30, 2019USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Aug. 23, 2020USD ($)

May 26, 2020claim

Aug. 31, 2019USD ($)

Aug. 12, 2016USD ($)

Loss Contingencies [Line Items]

Number of derivative actions filed | action

10

Gains related to favorable dispute resolution

$ 18

$ 13

Claim revenue for costs

$ 216

$ 216

$ 198

Purple Line Transit Partners L L C

Loss Contingencies [Line Items]

Ownership interest

15.00%

Purple Line Transit Constructors, LLC

Loss Contingencies [Line Items]

Ownership interest

50.00%

Purple Line Transit Partners L L C | Purple Line Transit Project | Positive Outcome of Litigation

Loss Contingencies [Line Items]

Proceeds from Legal Settlements

116

Litigation Settlement, Account Receivable Awarded

150

$ 150

Fluor T E C H I N T | Barrick

Loss Contingencies [Line Items]

Letters of credit outstanding, amount

$ 36

Fluor T E C H I N T | Barrick | Parent Company

Loss Contingencies [Line Items]

Letters of credit outstanding, amount

24

Fluor T E C H I N T | Barrick | Partnership Interest

Loss Contingencies [Line Items]

Letters of credit outstanding, amount

$ 12

Purple Line Transit Project | Minimum

Loss Contingencies [Line Items]

Right to terminate contract, period

365 days

Project Design and Construction Delay, Events Outside Control, Period

2 years 6 months

D B Contract | Minimum

Loss Contingencies [Line Items]

Right to terminate contract, period

365 days

Pending litigation

Loss Contingencies [Line Items]

Number of pending matters | claim

1

Damages sought

$ 1,470

Pending litigation | Sadara Chemical Company

Loss Contingencies [Line Items]

Damages sought

$ 100

Estimate of possible loss

$ 574

Pending litigation | Fluor T E C H I N T

Loss Contingencies [Line Items]

Estimate of possible loss

$ 330

$ 330

$ 250

Contract Assets and Liabiliti_2

Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue from External Customer [Line Items]
Contract assets	$ 681,000	$ 851,000
Contract work in progress	287,000	387,000
Advances that are payments on account of contract assets	310,000	574,000
Provision for Loss on Contracts	203,000	371,000
Revenue recognized	755,000	779,000
Contract assets ($244,552 and $294,116 related to VIEs)	$ 967,827	$ 1,238,173

Remaining Unsatisfied Perform_3

Remaining Unsatisfied Performance Obligations - Schedule of Remaining Performance Obligation (Details) $ in Millions	Dec. 31, 2020USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 23,468
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 10,873
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 6,150
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 6,445
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

Lines of Credit, Senior Notes_3

Lines of Credit, Senior Notes and Other Borrowings - Consolidated Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-Term	$ 1,710,033	$ 1,651,739
Notes Payable, Other Payables
Debt Instrument [Line Items]
Current	25,415	38,728
Long-Term	8,935	4,812
Senior Notes 1.750%, Due 21 March 2023
Debt Instrument [Line Items]
Long-Term	609,764	557,185
Senior Notes 3.5%, Due 15 December 2024
Debt Instrument [Line Items]
Long-Term	496,200	495,240
Senior Notes 4.25%, Due 15 September 2028
Debt Instrument [Line Items]
Long-Term	$ 595,134	$ 594,502

Lines of Credit, Senior Notes_4

Lines of Credit, Senior Notes and Other Borrowings - Narrative (Details)	1 Months Ended				12 Months Ended
	Feb. 28, 2021USD ($)	Aug. 31, 2018USD ($)	Mar. 31, 2016EUR (€)	Nov. 30, 2014USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Feb. 28, 2021EUR (€)
Debt Instrument [Line Items]
Repayment of 2021 Notes					$ 0	$ 0	$ (503,285,000)
Stork Holding B.V.
Debt Instrument [Line Items]
Other borrowings					$ 34,000,000	$ 44,000,000
Senior Notes 4.25%, Due 15 September 2028
Debt Instrument [Line Items]
Debt instrument, face amount		$ 600,000,000
Interest rate		4.25%
Proceeds from issuance of notes, net of underwriting discounts		$ 595,000,000
Senior Notes 4.25%, Due 15 September 2028 | Prior to June 15, 2028
Debt Instrument [Line Items]
Redemption price (as a percent)					100.00%
Senior Notes 1.750%, Due 21 March 2023
Debt Instrument [Line Items]
Debt instrument, face amount | €			€ 500,000,000
Interest rate			1.75%
Proceeds from issuance of notes, net of underwriting discounts | €			€ 497,000,000
Senior Notes 1.750%, Due 21 March 2023 | Minimum | Prior to December 21, 2022
Debt Instrument [Line Items]
Redemption price (as a percent)					100.00%
Senior Notes 3.5%, Due 15 December 2024
Debt Instrument [Line Items]
Debt instrument, face amount				$ 500,000,000
Interest rate				3.50%
Proceeds from issuance of notes, net of underwriting discounts				$ 491,000,000
Senior Notes 3.5%, Due 15 December 2024 | Minimum | Prior to September 15, 2024
Debt Instrument [Line Items]
Redemption price (as a percent)					100.00%
Senior Notes Due 2018, 2016 and 2014
Debt Instrument [Line Items]
Redemption price (as a percent)					101.00%
Lines of credit | Committed lines of credit
Debt Instrument [Line Items]
Letters of credit outstanding					$ 418,000,000
Lines of credit | Committed lines of credit | Subsequent Event
Debt Instrument [Line Items]
Letters of credit outstanding	$ 934,000,000
Lines of credit | Committed lines of credit | Revolving Loan and Letter of Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 1,800,000,000
Lines of credit | Committed lines of credit | Revolving Loan and Letter of Credit Facility | Minimum
Debt Instrument [Line Items]
Debt-to-capitalization ratio (cannot exceed)					60.00%
Lines of credit | Committed lines of credit | Revolving Loan and Letter of Credit Facility | Minimum | Subsequent Event
Debt Instrument [Line Items]
Credit facility	$ 1,650,000,000
Debt-to-capitalization ratio (cannot exceed)	65.00%
Lines of credit | Committed lines of credit | Revolving Loan And Letter Of Credit Facility Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 1,700,000,000
Lines of credit | Uncommitted Credit Line
Debt Instrument [Line Items]
Credit facility					$ 862,000,000
Subsidiaries | Lines of credit | Committed lines of credit | Revolving Loan and Letter of Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Covenant minimum liquidity	$ 1,500,000,000
Covenant, minimum liquidity after repayments of debt	1,250,000,000
Subsidiaries | Lines of credit | Committed lines of credit | Revolving Loan and Letter of Credit Facility | Maximum | Subsequent Event
Debt Instrument [Line Items]
Cap on aggregate amount of debt (greater of)	$ 750,000,000							€ 750,000,000

Fair Value Measurements - Recur

Fair Value Measurements - Recurring Basis (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair value of assets and liabilities measured on recurring basis
Proceeds from the sales and maturities of available-for-sale securities	$ 0	$ 0	$ 175,000,000
Fair value, recurring basis
Fair value of assets and liabilities measured on recurring basis
Deferred compensation trusts	9,626,000	7,719,000
Fair value, recurring basis | Foreign currency
Fair value of assets and liabilities measured on recurring basis
Derivative assets	22,667,000	7,167,000
Derivative liabilities	2,571,000	6,561,000
Fair value, recurring basis | Commodity
Fair value of assets and liabilities measured on recurring basis
Derivative assets	806,000	46,000
Derivative liabilities	5,059,000	1,247,000
Fair value, recurring basis | Level 1
Fair value of assets and liabilities measured on recurring basis
Deferred compensation trusts	9,626,000	7,719,000
Fair value, recurring basis | Level 2 | Foreign currency
Fair value of assets and liabilities measured on recurring basis
Derivative assets	22,667,000	7,167,000
Derivative liabilities	2,571,000	6,561,000
Fair value, recurring basis | Level 2 | Commodity
Fair value of assets and liabilities measured on recurring basis
Derivative assets	806,000	46,000
Derivative liabilities	$ 5,059,000	$ 1,247,000

Fair Value Measurements - Finan

Fair Value Measurements - Financial Instruments Not Required to be Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2018	Mar. 31, 2016	Nov. 30, 2014
Senior Notes 1.750%, Due 21 March 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate				1.75%
Senior Notes 3.5%, Due 15 December 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate					3.50%
Senior Notes 4.25%, Due 15 September 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate			4.25%
Carrying Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities, current	$ 23,345	$ 7,262
Carrying Value | Level 2 | Senior Notes 1.750%, Due 21 March 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	609,764	557,185
Carrying Value | Level 2 | Senior Notes 3.5%, Due 15 December 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	496,200	495,240
Carrying Value | Level 2 | Senior Notes 4.25%, Due 15 September 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	595,134	594,502
Carrying Value | Level 2 | Other borrowings, including noncurrent portion
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	34,350	43,539
Carrying Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, including noncurrent portion	38,295	28,117
Carrying Value | Cash | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,180,024	1,014,138
Carrying Value | Cash equivalents | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,018,757	983,061
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities, current	23,345	7,262
Fair Value | Level 2 | Senior Notes 1.750%, Due 21 March 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	578,554	562,399
Fair Value | Level 2 | Senior Notes 3.5%, Due 15 December 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	494,045	510,145
Fair Value | Level 2 | Senior Notes 4.25%, Due 15 September 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	599,220	609,918
Fair Value | Level 2 | Other borrowings, including noncurrent portion
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	34,350	43,539
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, including noncurrent portion	38,295	28,117
Fair Value | Cash | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,180,024	1,014,138
Fair Value | Cash equivalents | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 1,018,757	$ 983,061

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill impairment	$ 169
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2021	2
2022	1
2023	1
2024	1
2025	1
Customer relationships
Goodwill [Line Items]
Impairment loss	$ 27	$ 34

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Each Major Intangible Asset Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (12,649)	$ (10,830)
total Intangible Assets, Gross Carrying Amount	90,222	117,370
Total intangible assets, Net Book Value	77,573	106,540
Trade names
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets	53,411	49,789
In-process research and development
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets	16,900	16,900
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	31,894
Accumulated Amortization	0	(451)
Net Book Value	$ 0	31,443
Weighted Average Life (in years)	8 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 9,169	8,388
Accumulated Amortization	(4,844)	(3,460)
Net Book Value	$ 4,325	4,928
Weighted Average Life (in years)	13 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,742	10,399
Accumulated Amortization	(7,805)	(6,919)
Net Book Value	$ 2,937	$ 3,480
Weighted Average Life (in years)	10 years

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property plant and equipment
Gross property, plant and equipment	$ 1,598,309	$ 1,558,915
Less accumulated depreciation	(1,037,225)	(964,089)
Net property, plant and equipment	561,084	594,826
Land
Property plant and equipment
Gross property, plant and equipment	52,424	50,129
Buildings
Property plant and equipment
Gross property, plant and equipment	299,560	279,901
Building and leasehold improvements
Property plant and equipment
Gross property, plant and equipment	153,333	155,917
Machinery and equipment
Property plant and equipment
Gross property, plant and equipment	927,075	875,581
Furniture and fixtures
Property plant and equipment
Gross property, plant and equipment	144,667	133,573
Construction in progress
Property plant and equipment
Gross property, plant and equipment	$ 21,250	$ 63,814

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recorded compensation cost for stock based payment arrangements, net of tax	$ 22	$ 36	$ 43
Recognized tax benefits for stock based payment arrangements	5	$ 8	$ 10
Options outstanding, aggregate intrinsic value (in shares)	5
Options exercisable, aggregate intrinsic value	$ 0
RSU or Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
VDI units granted (in shares)	1,355,975	1,356,303	603,111
Weighted-average grant date fair value (in dollars per share)	$ 10.30	$ 32.68	$ 57.88
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock units and shares vested	$ 5	$ 14	$ 28
Balance of unamortized expense	$ 10
Weighted average period of recognition of unamortized expense	1 year 4 months 24 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Balance of unamortized expense	$ 6
Weighted average period of recognition of unamortized expense	2 years 2 months 12 days
Expiration term	10 years
Aggregate intrinsic value of stock options exercised	$ 0	$ 0.3	2
Blend of historical and implied volatility (ratio)	50.00%	50.00%
Performance-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Balance of unamortized expense	$ 16	$ 14
Unamortized compensation expense	0.1
SGI Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance of unamortized expense	29	8
Corporate general and administrative expense | RSU or Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	17	32	30
Corporate general and administrative expense | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	5	4	4
Corporate general and administrative expense | Performance-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense		1	9
Fully vested awards that were settled in cash	3	8	10
Corporate general and administrative expense | SGI Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fully vested awards that were settled in cash	$ 25	$ 6	$ 6
Executives | RSU or Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Grants in the period (in shares)	1
Executives | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Executives | Performance-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
VDI units granted (in shares)	1,156,365	350,532	206,598
2019 VDI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
VDI units granted (in shares)	385,455
Weighted-average grant date fair value (in dollars per share)	$ 9.05
2018 VDI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
VDI units granted (in shares)	116,844
Weighted-average grant date fair value (in dollars per share)	$ 9.77
2017 VDI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
VDI units granted (in shares)	68,866
Weighted-average grant date fair value (in dollars per share)	$ 10.75
Maximum | Performance-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of recognition of unamortized expense	2 months 12 days

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock, Restricted Stock Unit and Stock Option Activity, Terms and Significant Assumptions for Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
RSU or Restricted Stock
Restricted Stock Units or Restricted Stock, Number
Beginning balance (in shares)	1,660,311	985,132	933,464
Granted (in shares)	1,355,975	1,356,303	603,111
Expired or canceled (in shares)	(114,352)	(173,604)	(38,365)
Vested/exercised (in shares)	(643,340)	(507,520)	(513,078)
Ending balance (in shares)	2,258,594	1,660,311	985,132
Restricted Stock Units or Restricted Stock, Weighted Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share)	$ 39.88	$ 53.78	$ 51.85
Granted (in dollars per share)	10.30	32.68	57.88
Expired or canceled (in dollars per share)	33.74	39.57	54.07
Vested/exercised (in dollars per share)	42.23	47.72	51.58
Ending balance (in dollars per share)	$ 21.76	$ 39.88	$ 53.78
Stock Options
Stock Options, Number
Beginning balance (in shares)	5,381,477	4,589,385	5,069,956
Granted (in shares)	975,290	1,192,108	33,615
Expired or canceled (in shares)	(603,835)	(351,885)	(352,624)
Vested/exercised (in shares)	0	(48,131)	(161,562)
Ending balance (in shares)	5,752,932	5,381,477	4,589,385
Options exercisable (in shares)	3,784,647
Remaining unvested options outstanding and expected to vest (in shares)	1,948,602
Stock Options, Weighted Average Exercise Price Per Share
Beginning balance (in dollars per share)	$ 52.13	$ 60.25	$ 60.08
Granted (in dollars per share)	11.06	22.47	58.15
Expired or canceled (in dollars per share)	59.46	60.56	64.64
Vested/exercised (in dollars per share)	0	30.46	44.92
Ending balance (in dollars per share)	44.40	$ 52.13	$ 60.25
Options exercisable (in dollars per share)	58.80
Remaining unvested options outstanding and expected to vest (in dollars per share)	$ 16.72

Stock-Based Compensation - Fair

Stock-Based Compensation - Fair Value of Options on Grant Date (Details) - Stock Options - $ / shares	1 Months Ended	3 Months Ended	9 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Nov. 30, 2020	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)	$ 9.05	$ 6.93	$ 7.99	$ 4.59	$ 14.87
Expected life of options	7 years 2 months 12 days	5 years 4 months 24 days	5 years 7 months 6 days	4 years 7 months 6 days	5 years 3 months 18 days
Risk-free interest rate	0.50%	1.70%	2.60%	0.40%	2.70%
Expected volatility (as a percent)	60.80%	46.60%	33.30%	64.90%	28.20%
Expected annual dividend per share (in dollars per share)	$ 0	$ 0.40	$ 0.84	$ 0	$ 0.84

Stock-Based Compensation - Rang

Stock-Based Compensation - Range of Exercise Prices and Intrinsic Value Related to Options Outstanding (Details)	12 Months Ended
	Dec. 31, 2020$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Options Outstanding, Number Outstanding (in shares) | shares	5,752,932
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 10 months 24 days
Options Outstanding, Weighted Average Exercise Price Per Share (in dollars per share)	$ 44.40
Options Exercisable, Number Exercisable (in shares) | shares	3,784,647
Options Exercisable, Weighted Average Remaining Contractual Life	4 years 2 months 12 days
Options Exercisable, Weighted Average Exercise Price Per Share (In dollars per share)	$ 58.80
$8.81 - $29.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices, low end of range (in dollars per share)	8.81
Range of Exercise Prices, high end of range (in dollars per share)	$ 29.50
Options Outstanding, Number Outstanding (in shares) | shares	2,088,027
Options Outstanding, Weighted Average Remaining Contractual Life	9 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price Per Share (in dollars per share)	$ 17.27
Options Exercisable, Number Exercisable (in shares) | shares	130,947
Options Exercisable, Weighted Average Remaining Contractual Life	8 years 4 months 24 days
Options Exercisable, Weighted Average Exercise Price Per Share (In dollars per share)	$ 29.03
$46.07 - $62.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices, low end of range (in dollars per share)	46.07
Range of Exercise Prices, high end of range (in dollars per share)	$ 62.50
Options Outstanding, Number Outstanding (in shares) | shares	3,054,457
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price Per Share (in dollars per share)	$ 56.48
Options Exercisable, Number Exercisable (in shares) | shares	3,043,252
Options Exercisable, Weighted Average Remaining Contractual Life	4 years 4 months 24 days
Options Exercisable, Weighted Average Exercise Price Per Share (In dollars per share)	$ 56.47
$70.76 - $79.19
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices, low end of range (in dollars per share)	70.76
Range of Exercise Prices, high end of range (in dollars per share)	$ 79.19
Options Outstanding, Number Outstanding (in shares) | shares	610,448
Options Outstanding, Weighted Average Remaining Contractual Life	2 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price Per Share (in dollars per share)	$ 76.77
Options Exercisable, Number Exercisable (in shares) | shares	610,448
Options Exercisable, Weighted Average Remaining Contractual Life	2 years 3 months 18 days
Options Exercisable, Weighted Average Exercise Price Per Share (In dollars per share)	$ 76.77

Stock-Based Compensation - VDI

Stock-Based Compensation - VDI Units Granted (Details)	12 Months Ended
	Dec. 31, 2020$ / sharesshares
2019 VDI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
VDI units granted (in shares) | shares	385,455
Weighted-average grant date fair value (in dollars per share) | $ / shares	$ 9.05
2018 VDI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
VDI units granted (in shares) | shares	116,844
Weighted-average grant date fair value (in dollars per share) | $ / shares	$ 9.77
2017 VDI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
VDI units granted (in shares) | shares	68,866
Weighted-average grant date fair value (in dollars per share) | $ / shares	$ 10.75

Retirement Plans - Defined Cont

Retirement Plans - Defined Contribution Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Expense associated with contributions to defined benefit contribution retirement plans	$ 130	$ 115	$ 150
Multiemployer plan, employer contribution, cost	$ 38	$ 32	$ 30

Retirement Plans - Defined Bene

Retirement Plans - Defined Benefit Pension Plan Amendments and Settlement (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Loss on pension settlement	$ 138,000	$ (400)	$ 137,900	$ 21,900
(Gain) loss on pension settlement		(406)	137,898	21,900
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Loss on partial pension settlement		$ (406)	137,898	$ 21,900
Defined Benefit Pension Plans | UK Plan
Defined Benefit Plan Disclosure [Line Items]
Loss on partial pension settlement			$ (138,000)

Retirement Plans - Net Periodic

Retirement Plans - Net Periodic Pension Expense for Defined Benefit Pension Plans (Details) - Defined Benefit Pension Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 18,129	$ 15,750	$ 17,999
Interest cost	9,899	19,617	21,820
Expected return on assets	(26,304)	(32,645)	(38,064)
Amortization of prior service credit	(903)	(886)	(935)
Recognized net actuarial loss	5,806	10,303	8,368
(Gain) loss on settlement	(406)	137,898	21,900
Net periodic pension expense	$ 6,221	$ 150,037	$ 31,088

Retirement Plans - Assumptions

Retirement Plans - Assumptions for Determining Projected Benefit Obligation and Net Periodic Cost of Defined Benefit Pension Plans (Details) - Defined Benefit Pension Plans - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
For determining net periodic cost for the year:
Increase in plan liability, if discount rate were reduced by 25 basis points	$ 57,000,000
Minimum
For determining projected benefit obligation ("PBO") at year-end:
Discount rate	80.00%	120.00%	180.00%
Rate of increase in compensation levels	225.00%	225.00%	225.00%
For determining net periodic cost for the year:
Discount rate	120.00%	180.00%	190.00%
Rate of increase in compensation levels	225.00%	225.00%	225.00%
Expected long-term rate of return on assets	120.00%	180.00%	190.00%
Maximum
For determining projected benefit obligation ("PBO") at year-end:
Discount rate	3.50%	4.75%	7.25%
Rate of increase in compensation levels	6.00%	6.00%	7.00%
For determining net periodic cost for the year:
Discount rate	4.75%	7.25%	5.50%
Rate of increase in compensation levels	6.00%	7.00%	7.00%
Expected long-term rate of return on assets	5.60%	8.20%	7.00%
Expected contributions in next fiscal year	$ 12,000,000

Retirement Plans - Target and W

Retirement Plans - Target and Weighted Average Actual Allocations and Benefit Pension Plans (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation (as a percent)	100.00%	100.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation (as a percent)	63.00%	60.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation (as a percent)	28.00%	31.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation (as a percent)	9.00%	9.00%
Defined Benefit Pension Plans | Minimum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	55.00%
Defined Benefit Pension Plans | Minimum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	25.00%
Defined Benefit Pension Plans | Minimum | Other
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	0.00%
Defined Benefit Pension Plans | Maximum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	65.00%
Defined Benefit Pension Plans | Maximum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	35.00%
Defined Benefit Pension Plans | Maximum | Other
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	10.00%
Defined Benefit Pension Plans | Maximum | Common or collective trusts
Defined Benefit Plan Disclosure [Line Items]
Redemption notice period to redeem investments	30 days

Retirement Plans - Fair Value M

Retirement Plans - Fair Value Measurements and Expected Benefit Payments for Defined Benefit Pension Plans (Details) - Defined Benefit Pension Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	$ 829,420	$ 710,663	$ 964,289
Expected benefit payments for defined benefit pension plans
2021	21,387
2022	21,461
2023	21,677
2024	22,347
2025	23,065
2026 — 2030	125,302
Plan assets measured at fair value, net
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	827,913	710,073
Plan assets measured at fair value, net | Common Stock
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	5,252	5,346
Plan assets measured at fair value, net | Common or collective trusts - Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	230,135	215,904
Plan assets measured at fair value, net | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	532	493
Plan assets measured at fair value, net | Government securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	12,036	12,962
Plan assets measured at fair value, net | Common or collective trusts - Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	507,691	412,416
Plan assets measured at fair value, net | Guaranteed investment contracts
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	20,588	19,650
Plan assets measured at fair value, net | Common or collective trusts - Other
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	51,679	43,302
Plan assets not measured at fair value, net
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	1,507	590
Level 1 | Plan assets measured at fair value, net
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	5,252	5,346
Level 1 | Plan assets measured at fair value, net | Common Stock
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	5,252	5,346
Level 2 | Plan assets measured at fair value, net
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	802,073	685,077
Level 2 | Plan assets measured at fair value, net | Common or collective trusts - Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	230,135	215,904
Level 2 | Plan assets measured at fair value, net | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	532	493
Level 2 | Plan assets measured at fair value, net | Government securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	12,036	12,962
Level 2 | Plan assets measured at fair value, net | Common or collective trusts - Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	507,691	412,416
Level 2 | Plan assets measured at fair value, net | Common or collective trusts - Other
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	51,679	43,302
Level 3
Reconciliation of the beginning and ending balances of the fair value measurements using significant unobservable inputs (Level 3):
Balance at beginning of year	19,650	374,724
Actual return on plan assets: Assets still held at reporting date	2,092	1,609
Actual return on plan assets: Assets sold during the period	0	49,524
Purchases	343	187
Settlements	(1,497)	(406,394)
Balance at end of year	20,588	19,650
Level 3 | Plan assets measured at fair value, net
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	20,588	19,650
Level 3 | Plan assets measured at fair value, net | Guaranteed investment contracts
Defined Benefit Plan Disclosure [Line Items]
Total plan assets, net	$ 20,588	$ 19,650

Retirement Plans - Change in Pr

Retirement Plans - Change in Projected Benefit Obligation and Plan Assets and Funded Status of Defined Benefit Pension Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amounts recognized in the Consolidated Balance Sheet:
Pension assets included in other assets	$ 0	$ 1,349
Pension liabilities included in other accrued liabilities	(647)	(2,041)
Pension liabilities included in noncurrent liabilities	(39,768)	(37,429)
AOCI (pre-tax)	161,534	130,619
Projected benefit obligations	869,835	78,961
Fair value of plan assets	829,420	39,491
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	45,757	73,865
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets	20,588	39,491
Defined Benefit Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	748,784	1,020,633
Service cost	18,129	15,750	$ 17,999
Interest cost	9,899	19,617	21,820
Employee contributions	2,860	3,382
Currency translation	72,178	(2,794)
Actuarial (gain) loss (1)	58,258	117,549
Benefits paid	(17,224)	(27,362)
Divestitures	0	(1,669)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment	(6,574)	0
Settlements	(16,475)	(396,322)
PBO at end of year	869,835	748,784	1,020,633
Change in plan assets:
Plan assets at beginning of year	710,663	964,289
Actual return on plan assets	55,819	153,033
Company contributions	24,752	14,591
Employee contributions	2,860	3,382
Currency translation	69,025	(948)
Benefits paid	(17,224)	(27,362)
Settlements	(16,475)	(396,322)
Plan assets at end of year	829,420	710,663	$ 964,289
Funded status — (Under)/overfunded	(40,415)	(38,121)
Amounts recognized in the Consolidated Balance Sheet:
The total accumulated benefit obligation	$ 793,000	$ 681,000

Retirement Plans - Multiemploye

Retirement Plans - Multiemployer Pension Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Multiemployer pension plan contributions for employees covered under various collective bargaining agreements	$ 38	$ 32	$ 30

Other Noncurrent Liabilities (D

Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Noncurrent Liabilities [Line Items]
Deferred compensation trusts	$ 350,427	$ 341,235
Noncurrent liabilities
Other Noncurrent Liabilities [Line Items]
Deferred compensation and retirement obligations	329,000	338,000
Insurance liabilities	$ 70,000	$ 80,000

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 1,249,809	$ 1,700,912
Rental expense			$ 360,000
Discontinued Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Rental expense			$ 2,000
Discontinued Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating cash flows from operating leases	$ 780	$ 787

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Continuing Operations
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 83,938	$ 90,591
Finance lease cost, Amortization of right-of-use assets	651	1,394
Finance lease cost, Interest on lease liabilities	23	65
Variable lease cost	7,415	19,231
Short-term lease cost	92,161	119,737
Sublease income	(6,797)	(8,905)
Total lease expense	177,391	222,113
Discontinued Operations
Lessee, Lease, Description [Line Items]
Operating lease cost	792	809
Finance lease cost, Amortization of right-of-use assets	676	27
Finance lease cost, Interest on lease liabilities	117	2
Variable lease cost	0	0
Short-term lease cost	24,900	43,807
Sublease income	(10,278)	(25,832)
Total lease expense	$ 16,207	$ 18,813

Leases - Information Related to

Leases - Information Related to Right-of-Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets	us-gaap:OtherAssets
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets	us-gaap:OtherAssets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityNoncurrent	us-gaap:OperatingLeaseLiabilityNoncurrent
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:LiabilitiesAbstract	us-gaap:LiabilitiesAbstract
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityNoncurrent	us-gaap:OperatingLeaseLiabilityNoncurrent
Finance Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:LiabilitiesAbstract	us-gaap:LiabilitiesAbstract
Continuing Operations
Lessee, Lease, Description [Line Items]
Total right-of-use assets	$ 215,534	$ 273,229
Operating lease liabilities	238,956
Finance lease liabilities	114
Total lease liabilities	239,070	299,249
Continuing Operations | Other assets
Lessee, Lease, Description [Line Items]
Operating lease assets	215,134	259,169
Finance lease assets	400	937
Continuing Operations | Current assets held for sale
Lessee, Lease, Description [Line Items]
Operating lease assets	0	13,123
Finance lease assets	0	0
Continuing Operations | Other accrued liabilities
Lessee, Lease, Description [Line Items]
Operating lease liabilities, current	62,180	65,961
Finance lease liabilities, current	114	906
Continuing Operations | Noncurrent liabilities
Lessee, Lease, Description [Line Items]
Operating lease liabilities, noncurrent	176,776	219,146
Finance lease liabilities, noncurrent	0	8
Continuing Operations | Current liabilities held for sale
Lessee, Lease, Description [Line Items]
Operating lease liabilities	0	13,228
Finance lease liabilities	0	0
Discontinued Operations
Lessee, Lease, Description [Line Items]
Total right-of-use assets	11,503	3,440
Operating lease liabilities	2,434
Finance lease liabilities	8,327
Total lease liabilities	10,761	3,371
Discontinued Operations | Other assets
Lessee, Lease, Description [Line Items]
Operating lease assets	0	0
Finance lease assets	0	0
Discontinued Operations | Current assets held for sale
Lessee, Lease, Description [Line Items]
Operating lease assets	2,434	3,259
Finance lease assets	9,069	181
Discontinued Operations | Other accrued liabilities
Lessee, Lease, Description [Line Items]
Operating lease liabilities, current	0	0
Finance lease liabilities, current	0	0
Discontinued Operations | Noncurrent liabilities
Lessee, Lease, Description [Line Items]
Operating lease liabilities, noncurrent	0	0
Finance lease liabilities, noncurrent	0	0
Discontinued Operations | Current liabilities held for sale
Lessee, Lease, Description [Line Items]
Operating lease liabilities	2,434	3,180
Finance lease liabilities	$ 8,327	$ 191

Leases - Supplemental Informati

Leases - Supplemental Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Continuing Operations
Lessee, Lease, Description [Line Items]
Operating cash flows from operating leases	$ 89,649	$ 91,308
Operating cash flows from finance leases	23	65
Financing cash flows from finance leases	761	1,547
Right-of-use assets obtained in exchange for new operating lease liabilities	20,471	96,984
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 0	$ 0
Weighted-average remaining lease term - operating leases	6 years 1 month 6 days	6 years 6 months
Weighted-average remaining lease term - finance leases	2 years 1 month 6 days	2 years 2 months 12 days
Weighted-average discount rate - operating leases	3.04%	3.34%
Weighted-average discount rate - finance leases	3.39%	3.38%
Discontinued Operations
Lessee, Lease, Description [Line Items]
Operating cash flows from operating leases	$ 780	$ 787
Operating cash flows from finance leases	117	3
Financing cash flows from finance leases	1,365	25
Right-of-use assets obtained in exchange for new operating lease liabilities	0	546
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 8,663	$ 222
Weighted-average remaining lease term - operating leases	4 years 3 months 18 days	4 years 9 months 18 days
Weighted-average remaining lease term - finance leases	5 years	3 years 6 months
Weighted-average discount rate - operating leases	3.47%	3.50%
Weighted-average discount rate - finance leases	2.72%	2.64%

Leases - Remaining Lease Paymen

Leases - Remaining Lease Payments (Details) $ in Thousands	Dec. 31, 2020USD ($)
Continuing Operations
Operating Leases
2021	$ 68,649
2022	55,736
2023	41,029
2024	28,211
2025	20,275
Thereafter	47,358
Total lease payments	261,258
Less: Interest	(22,302)
Present value of lease liabilities	238,956
Finance Leases
2021	8
2022	55
2023	62
2024	0
2025	0
Thereafter	0
Total lease payments	125
Less: Interest	(11)
Present value of lease liabilities	114
Discontinued Operations
Operating Leases
2021	654
2022	609
2023	554
2024	482
2025	324
Thereafter	0
Total lease payments	2,623
Less: Interest	(189)
Present value of lease liabilities	2,434
Finance Leases
2021	2,927
2022	2,906
2023	1,436
2024	821
2025	612
Thereafter	0
Total lease payments	8,702
Less: Interest	(375)
Present value of lease liabilities	$ 8,327

Derivatives and Hedging - Narra

Derivatives and Hedging - Narrative (Details) $ in Millions	Dec. 31, 2020USD ($)
Designated as Hedging Instrument | Foreign currency
Derivative [Line Items]
Gross notional amounts	$ 749
Not Designated as Hedging Instrument | Foreign currency
Derivative [Line Items]
Gross notional amounts	228
Not Designated as Hedging Instrument | Commodity
Derivative [Line Items]
Gross notional amounts	$ 28

Derivatives and Hedging - Notio

Derivatives and Hedging - Notional Amounts and Fair Values (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value
Asset Derivatives	$ 22,188	$ 6,638
Liability Derivatives	29	6,332
Foreign currency | Other current assets
Derivatives, Fair Value
Asset Derivatives	20,004	2,871
Foreign currency | Other assets
Derivatives, Fair Value
Asset Derivatives	2,184	3,757
Foreign currency | Other accrued liabilities
Derivatives, Fair Value
Liability Derivatives	4	1,585
Foreign currency | Noncurrent liabilities
Derivatives, Fair Value
Liability Derivatives	25	4,747
Commodity | Other current assets
Derivatives, Fair Value
Asset Derivatives	0	10
Commodity | Other accrued liabilities
Derivatives, Fair Value
Liability Derivatives	$ 0	$ 0

Derivatives and Hedging - Gains

Derivatives and Hedging - Gains (Losses) Associated with Cash Flow Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain (Loss) Recognized in OCI	$ 19,501	$ 1,503	$ (5,207)
After-Tax Amount of Gain (Loss) Reclassified from AOCI into Earnings	604	(1,637)	(5,481)
Foreign currency
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain (Loss) Recognized in OCI	19,608	1,043	(5,207)
Foreign currency | Total cost of revenue
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain (Loss) Reclassified from AOCI into Earnings	2,382	(1,041)	(4,432)
Commodity
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain (Loss) Recognized in OCI	(107)	460	0
Commodity | Total cost of revenue
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain (Loss) Reclassified from AOCI into Earnings	(100)	453	0
Interest rate contracts
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain (Loss) Recognized in OCI	0	0	0
Interest rate contracts | Interest expense
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain (Loss) Reclassified from AOCI into Earnings	$ (1,678)	$ (1,049)	$ (1,049)

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) - Tax Effects of Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	$ (34,825)	$ 240,627	$ (161,953)
Tax (Expense) Benefit	(1,325)	(78,319)	18,726
Total OCI, net of tax	(36,150)	162,308	(143,227)
Foreign currency translation adjustments
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	(17,127)	101,096	(116,775)
Tax (Expense) Benefit	0	(35,596)	16,214
Total OCI, net of tax	(17,127)	65,500	(100,561)
Ownership share of equity method investees' OCI
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	(21,837)	(15,630)	12,118
Tax (Expense) Benefit	3,309	3,846	(3,176)
Total OCI, net of tax	(18,528)	(11,784)	8,942
DB plan adjustments
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	(19,392)	150,427	(59,920)
Tax (Expense) Benefit	0	(44,975)	7,329
Total OCI, net of tax	(19,392)	105,452	(52,591)
Unrealized gain (loss) on hedges
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	23,531	4,734	1,490
Tax (Expense) Benefit	(4,634)	(1,594)	(1,216)
Total OCI, net of tax	18,897	3,140	274
Unrealized gain (loss) on available-for-sale securities
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	0	0	1,134
Tax (Expense) Benefit	0	0	(425)
Total OCI, net of tax	0	0	709
Less: OCI attributable to NCI
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	883	(1,350)	(2,239)
Tax (Expense) Benefit	0	0	0
Total OCI, net of tax	883	(1,350)	(2,239)
OCI attributable to Fluor Corporation
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	(35,708)	241,977	(159,714)
Tax (Expense) Benefit	(1,325)	(78,319)	18,726
Total OCI, net of tax	$ (37,033)	$ 163,658	$ (140,988)

Other Comprehensive Income (L_4

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

Other Comprehensive Income (L_5

Other Comprehensive Income (Loss) - Significant Items Reclassified Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassifications out of accumulated other comprehensive income (loss)
Impairment, restructuring & other exit costs	$ (145,000)	$ (334,000)	$ (27,000)	$ (27,000)	$ (305,590)	$ (532,600)	$ 0
Interest expense					(72,120)	(74,104)	(77,144)
Corporate G&A					(240,692)	(165,921)	(121,164)
Income tax benefit					(18,592)	(485,230)	(173,331)
Net earnings (loss)					(366,791)	(1,553,122)	232,853
Net earnings attributable to NCI					68,200	(31,000)	59,400
Reclassified out of AOCI | Foreign currency translation adjustment
Reclassifications out of accumulated other comprehensive income (loss)
Impairment, restructuring & other exit costs					0	(84,286)	0
Income tax benefit					0	37,393	0
Net earnings (loss)					0	(46,893)	0
Reclassified out of AOCI | Ownership share of equity method investees' OCI
Reclassifications out of accumulated other comprehensive income (loss)
Cost of revenue					(730)	(695)	(1,297)
Income tax benefit					182	175	341
Net earnings (loss)					(548)	(520)	(956)
Reclassified out of AOCI | DB plan adjustments
Reclassifications out of accumulated other comprehensive income (loss)
Income tax benefit					0	45,133	4,112
Net earnings (loss)					(3,529)	(101,446)	(24,618)
Other General and Administrative Expense					(3,529)	(146,579)	(28,730)
Reclassified out of AOCI | Unrealized Gain (Loss) on Hedges
Reclassifications out of accumulated other comprehensive income (loss)
Income tax benefit					445	1,411	2,737
Net earnings (loss)					604	(1,637)	(5,481)
Reclassified out of AOCI | Unrealized Gain (Loss) on Hedges | Commodity and foreign currency contracts
Reclassifications out of accumulated other comprehensive income (loss)
Cost of revenue					1,837	(1,370)	(6,540)
Reclassified out of AOCI | Unrealized Gain (Loss) on Hedges | Interest rate contracts
Reclassifications out of accumulated other comprehensive income (loss)
Interest expense					(1,678)	(1,678)	(1,678)
Reclassified out of AOCI | Unrealized Gain (Loss) on Available- for-Sale Securities
Reclassifications out of accumulated other comprehensive income (loss)
Corporate G&A					0	0	(1,134)
Income tax benefit					0	0	425
Net earnings (loss)					$ 0	$ 0	$ (709)

Discontinued Operations - Narra

Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 31, 2020	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense - Disc Ops		$ 46,000	$ 100,000	$ 145,700	$ 0	$ 0
Goodwill impairment				169,000
AMECO | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense - Disc Ops				145,700	$ 0	$ 0
Goodwill impairment				$ 12,000
Consideration	$ 18,000
Loss on disposal	$ 1,000

Discontinued Operations - Earni

Discontinued Operations - Earnings From Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net earnings (loss) from Disc Ops	$ (141,147)	$ 3,603	$ 20,435
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	215,684	260,276	253,130
Cost of revenue	193,583	277,420	222,139
Corporate general and administrative expense	13,432	(20,913)	5,074
Impairment of assets held for sale	145,700	0	0
Interest expense (income), net	159	(341)	(354)
Total cost and expenses	352,874	256,166	226,859
Earnings (loss) before taxes from Disc Ops	(137,190)	4,110	26,271
Income tax expense (benefit)	3,957	507	5,836
Net earnings (loss) from Disc Ops	(141,147)	3,603	20,435
Discontinued Operations | Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	0	0
Cost of revenue	0	0	0
Corporate general and administrative expense	13,198	(21,152)	4,792
Impairment of assets held for sale	0	0	0
Interest expense (income), net	0	0	0
Total cost and expenses	13,198	(21,152)	4,792
Earnings (loss) before taxes from Disc Ops	(13,198)	21,152	(4,792)
Income tax expense (benefit)	0	4,447	(1,064)
Net earnings (loss) from Disc Ops	(13,198)	16,705	(3,728)
Discontinued Operations | AMECO
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	215,684	260,276	253,130
Cost of revenue	193,583	277,420	222,139
Corporate general and administrative expense	234	239	282
Impairment of assets held for sale	145,700	0	0
Interest expense (income), net	159	(341)	(354)
Total cost and expenses	339,676	277,318	222,067
Earnings (loss) before taxes from Disc Ops	(123,992)	(17,042)	31,063
Income tax expense (benefit)	3,957	(3,940)	6,900
Net earnings (loss) from Disc Ops	$ (127,949)	$ (13,102)	$ 24,163

Discontinued Operations - Asset

Discontinued Operations - Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contract assets	$ 967,827	$ 1,238,173
Current assets held for sale	237,617	517,100
Current liabilities related to assets held for sale	45,304	82,322
Total
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts and notes receivable, net	52,528	102,564
Contract assets	2,188	7,276
Other current assets	9,810	62,228
Current assets held for sale	64,526	172,068
Property, plant and equipment, net	154,240	297,584
Goodwill	0	21,633
Investments	5,063	7,293
Other assets	13,788	18,522
Noncurrent assets held for sale	173,091	345,032
Total assets held for sale	237,617	517,100
Accounts payable	17,443	31,394
Contract liabilities	135	4,491
Accrued salaries, wages and benefits	6,140	9,832
Current liabilities related to assets held for sale	12,107	21,013
Current liabilities held for sale	35,825	66,730
Noncurrent liabilities held for sale	9,479	15,592
Total liabilities held for sale	45,304	82,322
Total from Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts and notes receivable, net	52,464	85,051
Contract assets	2,188	3,497
Other current assets	7,098	54,116
Current assets held for sale	61,750	142,664
Property, plant and equipment, net	113,080	232,792
Goodwill	0	12,338
Investments	0	0
Other assets	13,788	5,868
Noncurrent assets held for sale	126,868	250,998
Total assets held for sale	188,618	393,662
Accounts payable	17,368	24,692
Contract liabilities	125	4,466
Accrued salaries, wages and benefits	6,042	8,913
Current liabilities related to assets held for sale	11,780	9,451
Current liabilities held for sale	35,315	47,522
Noncurrent liabilities held for sale	9,479	4,272
Total liabilities held for sale	44,794	51,794
Total from Discontinued Operations | AMECO
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts and notes receivable, net	41,988	69,126
Contract assets	2,188	3,497
Other current assets	7,098	54,116
Current assets held for sale	51,274	126,739
Property, plant and equipment, net	113,080	232,792
Goodwill	0	12,338
Investments	0	0
Other assets	13,788	5,868
Noncurrent assets held for sale	126,868	250,998
Total assets held for sale	178,142	377,737
Accounts payable	17,355	24,692
Contract liabilities	125	4,466
Accrued salaries, wages and benefits	6,042	8,913
Current liabilities related to assets held for sale	11,780	9,451
Current liabilities held for sale	35,302	47,522
Noncurrent liabilities held for sale	9,479	4,272
Total liabilities held for sale	44,781	51,794
Total from Discontinued Operations | Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts and notes receivable, net	10,476	15,925
Contract assets	0	0
Other current assets	0	0
Current assets held for sale	10,476	15,925
Property, plant and equipment, net	0	0
Goodwill	0	0
Investments	0	0
Other assets	0	0
Noncurrent assets held for sale	0	0
Total assets held for sale	10,476	15,925
Accounts payable	13	0
Contract liabilities	0	0
Accrued salaries, wages and benefits	0	0
Current liabilities related to assets held for sale	0	0
Current liabilities held for sale	13	0
Noncurrent liabilities held for sale	0	0
Total liabilities held for sale	13	0
Other Assets and Liabilities from Continuing Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts and notes receivable, net	64	17,513
Contract assets	0	3,779
Other current assets	2,712	8,112
Current assets held for sale	2,776	29,404
Property, plant and equipment, net	41,160	64,792
Goodwill	0	9,295
Investments	5,063	7,293
Other assets	0	12,654
Noncurrent assets held for sale	46,223	94,034
Total assets held for sale	48,999	123,438
Accounts payable	75	6,702
Contract liabilities	10	25
Accrued salaries, wages and benefits	98	919
Current liabilities related to assets held for sale	327	11,562
Current liabilities held for sale	510	19,208
Noncurrent liabilities held for sale	0	11,320
Total liabilities held for sale	$ 510	$ 30,528

Discontinued Operations - Conso

Discontinued Operations - Consolidated Statements of Cash Flows for the Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense - Disc Ops	$ 46,000	$ 100,000	$ 145,700	$ 0	$ 0
Depreciation of fixed assets			102,451	154,599	197,585
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation of fixed assets				44,000	72,000
Capital expenditures			(23,000)	(68,000)	(41,000)
Discontinued Operations | AMECO
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense - Disc Ops			145,700	0	0
Depreciation of fixed assets			0	44,295	72,137
Amortization of stock-based awards			56	123	103
Capital expenditures			$ (23,430)	$ (68,048)	$ (40,856)

Quarterly Financial Data (Una_3

Quarterly Financial Data (Unaudited) - Summary of Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 3,655,700	$ 3,803,200	$ 4,091,000	$ 4,118,600	$ 4,408,700	$ 4,628,600	$ 4,146,400	$ 4,133,600	$ 15,668,477	$ 17,317,284	$ 18,851,008
Cost of revenue	3,533,000	3,669,500	4,023,500	4,057,200	4,348,000	4,537,300	4,577,600	4,070,900	15,283,226	17,533,864	18,281,628
Earnings (loss) from Cont Ops before taxes	(41,700)	52,200	10,900	(228,400)	(271,800)	(258,800)	(511,900)	(29,000)	(207,052)	(1,071,495)	385,749
Net earnings (loss) from Cont Ops	(67,200)	23,400	(20,200)	(161,600)	(322,300)	(754,100)	(436,100)	(44,200)	(225,644)	(1,556,725)	212,418
Amounts attributable to Fluor Corporation:
Net earnings (loss) from Cont Ops	(115,000)	19,100	(26,900)	(171,100)	(293,700)	(766,600)	(397,400)	(68,100)	(293,899)	(1,525,767)	153,033
Net earnings (loss) attributable to Fluor Corporation from Disc Ops	(48,300)	200	1,900	(94,900)	(2,500)	23,500	(16,600)	(800)	(141,147)	3,603	20,435
NET EARNINGS (LOSS) ATTRIBUTABLE TO FLUOR CORPORATION	$ (163,300)	$ 19,300	$ (25,000)	$ (266,000)	$ (296,200)	$ (743,100)	$ (414,000)	$ (68,900)	$ (435,046)	$ (1,522,164)	$ 173,468
Basic earnings (loss) per share attributable to Fluor Corporation:
Net earnings (loss) from continuing operations (in dollars per share)	$ (0.82)	$ 0.14	$ (0.19)	$ (1.22)	$ (2.10)	$ (5.47)	$ (2.84)	$ (0.49)	$ (2.09)	$ (10.89)	$ 1.09
Net earnings from discontinued operations (in dollars per share)	(0.34)	0	0.01	(0.68)	(0.01)	0.17	(0.11)	0	(1.01)	0.02	0.15
Net earnings (loss) (in dollars per share)	(1.16)	0.14	(0.18)	(1.90)	(2.11)	(5.30)	(2.95)	(0.49)	(3.10)	(10.87)	1.24
Diluted earnings (loss) per share attributable to Fluor Corporation:
Net earnings (loss) from continuing operations (in dollars per share)	(0.82)	0.14	(0.19)	(1.22)	(2.10)	(5.47)	(2.84)	(0.49)	(2.09)	(10.89)	1.08
Net earnings from discontinued operations (in dollars per share)	(0.34)	0	0.01	(0.68)	(0.01)	0.17	(0.11)	0	(1.01)	0.02	0.15
Net earnings (loss) (in dollars per share)	$ (1.16)	$ 0.14	$ (0.18)	$ (1.90)	$ (2.11)	$ (5.30)	$ (2.95)	$ (0.49)	$ (3.10)	$ (10.87)	$ 1.23

Quarterly Financial Data (Una_4

Quarterly Financial Data (Unaudited) - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Data
Asset impairments		$ 298,000					$ 400	$ 90,400
Allowance for credit loss	$ 39,000		$ 35,000				39,000	35,000
Charges from project positions due to Covid-19 related schedule delays and associated cost growth		52,000
Impairment of assets held for sale (including Disc Ops)	$ 46,000	100,000					145,700	0	$ 0
Charges from resolution of close-out matters with customer						$ 31,000
Charges including settlement of client disputes and cost growth related to close-out matters					$ 109,000	26,000
Charges from write-off of pre-contract costs					26,000
Charges from schedule-driven cost growth and client and subcontractor negotiations					87,000
Charges from late engineering changes, schedule-driven cost growth, and negotiations with clients and subcontractors on pending change orders			78,000		55,000
Charges for late engineering changes, cost growth and ongoing assessments of certain unapproved change orders				$ 21,000	57,000	4,000
Gains related to favorable dispute resolution				18,000	13,000
Effect of forecast revision on estimated project cost				59,000
Valuation allowance against deferred tax assets during the period			185,000	546,000
Impairment, restructuring and other exit costs			145,000	$ 334,000	27,000	27,000	305,590	532,600	0
Loss on pension settlement			138,000				$ (400)	$ 137,900	$ 21,900
Previously unrecognized service fee revenue			89,000
Offshore Project
Quarterly Data
Charges from late design changes, schedule-driven cost growth including liquidated damages, and subcontractor negotiations			$ 20,000		$ 179,000	$ 61,000
Energy & Chemicals
Quarterly Data
Allowance for credit loss		$ 55,000