KBR (KBR) 10-Q 28 Oct 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Oct. 22, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-33146
Entity Registrant Name	KBR, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-4536774
Entity Address, Address Line One	601 Jefferson Street, Suite 3400
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	713
Local Phone Number	753-2000
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	KBR
Security Exchange Name	NYSE
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 Common Stock, Shares Outstanding (in shares)		140,285,318
Amendment Flag	false
Entity Central Index Key	0001357615
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenues	$ 1,843	$ 1,379	$ 4,840	$ 4,301
Cost of revenues	(1,650)	(1,207)	(4,272)	(3,801)
Gross profit	193	172	568	500
Equity in earnings (losses) of unconsolidated affiliates	(1)	13	(175)	30
Selling, general and administrative expenses	(91)	(89)	(283)	(259)
Acquisition and integration related costs	(3)	(2)	(7)	(2)
Goodwill impairment	0	0	0	(99)
Restructuring charges and asset impairments	0	(1)	(2)	(176)
Gain on disposition of assets and investments	3	0	1	18
Operating income	101	93	102	12
Interest expense	(23)	(18)	(68)	(60)
Other non-operating income (loss)	(1)	(4)	(2)	1
Income (loss) before income taxes and noncontrolling interests	77	71	32	(47)
Provision for income taxes	(19)	(19)	(75)	(24)
Net income (loss)	58	52	(43)	(71)
Less: Net income attributable to noncontrolling interests	3	0	7	20
Net income (loss) attributable to KBR	$ 55	$ 52	$ (50)	$ (91)
Net income (loss) attributable to KBR per share:
Basic (usd per share)	$ 0.39	$ 0.36	$ (0.36)	$ (0.64)
Diluted (usd per share)	$ 0.38	$ 0.36	$ (0.36)	$ (0.64)
Basic weighted average common shares outstanding (in shares)	140	142	141	142
Diluted weighted average common shares outstanding (in shares)	145	142	141	142
Cash dividends declared per share (usd per share)	$ 0.11	$ 0.10	$ 0.33	$ 0.30

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 58	$ 52	$ (43)	$ (71)
Other comprehensive income (loss):
Foreign currency translation adjustments	(16)	21	(4)	(27)
Pension and post-retirement benefits	9	6	25	18
Changes in fair value of derivatives	4	4	23	(19)
Other comprehensive income (loss)	(3)	31	44	(28)
Income tax (expense) benefit:
Foreign currency translation adjustments	1	0	0	0
Pension and post-retirement benefits	(2)	(1)	(5)	(3)
Changes in fair value of derivatives	0	(1)	(5)	4
Income tax (expense) benefit	(1)	(2)	(10)	1
Other comprehensive income (loss), net of tax	(4)	29	34	(27)
Comprehensive income (loss)	54	81	(9)	(98)
Less: Comprehensive income attributable to noncontrolling interests	3	0	7	20
Comprehensive income (loss) attributable to KBR	$ 51	$ 81	$ (16)	$ (118)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and equivalents	$ 550	$ 436
Accounts receivable, net of allowance for credit losses of $13 and $13, respectively	1,245	899
Contract assets	227	178
Other current assets	114	121
Total current assets	2,136	1,634
Claims and accounts receivable	30	30
Property, plant, and equipment, net of accumulated depreciation of $435 and $419 (including net PPE of $21 and $24 owned by a variable interest entity)	131	130
Operating lease right-of-use assets	154	154
Goodwill	1,772	1,761
Intangible assets, net of accumulated amortization of $279 and $228, respectively	635	683
Equity in and advances to unconsolidated affiliates	590	881
Deferred income taxes	237	297
Other assets	147	135
Total assets	5,832	5,705
Current liabilities:
Accounts payable	964	574
Contract liabilities	289	356
Accrued salaries, wages and benefits	318	283
Nonrecourse project debt	0	5
Operating lease liabilities	40	44
Other current liabilities	177	193
Total current liabilities	1,788	1,455
Pension obligations	310	381
Employee compensation and benefits	104	110
Income tax payable	94	96
Deferred income taxes	13	26
Nonrecourse project debt	2	2
Long-term debt	1,578	1,584
Operating lease liabilities	189	186
Other liabilities	254	256
Total liabilities	4,332	4,096
Commitments and Contingencies (Notes 6, 13 and 14)
KBR shareholders’ equity:
Preferred stock, $0.001 par value, 50,000,000 shares authorized, none issued	0	0
Common stock, $0.001 par value 300,000,000 shares authorized, 179,908,148 and 179,087,655 shares issued, and 140,260,422 and 140,766,052 shares outstanding, respectively	0	0
PIC	2,246	2,222
Retained earnings	1,208	1,305
Treasury stock, 39,647,726 shares and 38,321,603 shares, at cost, respectively	(919)	(864)
AOCL	(1,049)	(1,083)
Total KBR shareholders’ equity	1,486	1,580
Noncontrolling interests	14	29
Total shareholders’ equity	1,500	1,609
Total liabilities and shareholders’ equity	$ 5,832	$ 5,705

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 13	$ 13
Accumulated depreciation, PP&E	435	419
PP&E owned by a VIE, net	21	24
Accumulated amortization, Intangibles	$ 279	$ 228
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	179,908,148	179,087,655
Common stock, shares outstanding (in shares)	140,260,422	140,766,052
Treasury stock, shares (in shares)	39,647,726	38,321,603

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Adjustment	Adjusted balance	PIC	PICAdjusted balance	Retained Earnings	Retained EarningsAdjustment	Retained EarningsAdjusted balance	Treasury Stock	Treasury StockAdjusted balance	AOCL	AOCLAdjusted balance	NCI	NCIAdjusted balance
Beginning balance at Dec. 31, 2019	$ 1,853	$ (3)	$ 1,850	$ 2,206	$ 2,206	$ 1,437	$ (3)	$ 1,434	$ (817)	$ (817)	$ (987)	$ (987)	$ 14	$ 14
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	10			10
Common stock issued upon exercise of stock options	3			3
Dividends declared to shareholders	(43)					(43)
Repurchases of common stock	(4)								(4)
Issuance of ESPP shares	4								4
Distributions to noncontrolling interests	(3)												(3)
Other noncontrolling interests activity	(6)												(6)
Net income (loss)	(71)					(91)							20
Other comprehensive income (loss), net of tax	(27)										(27)
Ending balance at Sep. 30, 2020	1,713			2,219		1,300			(817)		(1,014)		25
Beginning balance at Jun. 30, 2020	1,642			2,216		1,262			(820)		(1,043)		27
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	3			3
Dividends declared to shareholders	(14)					(14)
Issuance of ESPP shares	2								2
Distributions to noncontrolling interests	(1)												(1)
Other									1				(1)
Net income (loss)	52					52
Other comprehensive income (loss), net of tax	29										29
Ending balance at Sep. 30, 2020	1,713			2,219		1,300			(817)		(1,014)		25
Beginning balance at Dec. 31, 2020	1,609			2,222		1,305			(864)		(1,083)		29
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	12			12
Common stock issued upon exercise of stock options	11			11
Dividends declared to shareholders	(47)					(47)
Repurchases of common stock	(58)								(58)
Issuance of ESPP shares	4			1					3
Distributions to noncontrolling interests	(23)												(23)
Other	1												1
Net income (loss)	(43)					(50)							7
Other comprehensive income (loss), net of tax	34										34
Ending balance at Sep. 30, 2021	1,500			2,246		1,208			(919)		(1,049)		14
Beginning balance at Jun. 30, 2021	1,501			2,240		1,169			(895)		(1,045)		32
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	4			4
Common stock issued upon exercise of stock options	1			1
Dividends declared to shareholders	(16)					(16)
Repurchases of common stock	(26)								(26)
Issuance of ESPP shares	2			1					1
Distributions to noncontrolling interests	(22)												(22)
Other	2								1				1
Net income (loss)	58					55							3
Other comprehensive income (loss), net of tax	(4)										(4)
Ending balance at Sep. 30, 2021	$ 1,500			$ 2,246		$ 1,208			$ (919)		$ (1,049)		$ 14

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per share (usd per share)	$ 0.11	$ 0.10	$ 0.33	$ 0.30

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ 58	$ 52	$ (43)	$ (71)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization			114	74
Equity in (earnings) losses of unconsolidated affiliates	1	(13)	175	(30)
Deferred income tax			38	(11)
Gain on disposition of assets	(3)	0	(1)	(18)
Goodwill impairment	0	0	0	99
Asset impairments			1	91
Other			39	25
Changes in operating assets and liabilities:
Accounts receivable, net of allowance for credit losses			(341)	(50)
Contract assets			(50)	49
Accounts payable			397	15
Contract liabilities			(41)	(124)
Accrued salaries, wages and benefits			41	46
Payments on operating lease obligation			(46)	(45)
Payments from unconsolidated affiliates, net			18	15
Distributions of earnings from unconsolidated affiliates			37	35
Pension funding			(35)	(33)
Restructuring reserve			(20)	31
Other assets and liabilities			(7)	147
Total cash flows provided by operating activities			276	245
Cash flows from investing activities:
Purchases of property, plant and equipment			(22)	(8)
Proceeds from disposition of assets and investments			44	1
Investments in equity method joint ventures			(13)	(22)
Acquisition of businesses, net of cash acquired			(14)	(9)
Acquisition of technology license			(7)	0
Other			(10)	0
Total cash flows used in investing activities			(22)	(38)
Cash flows from financing activities:
Borrowings on long-term debt			0	359
Payments on short-term and long-term borrowings			(25)	(270)
Debt issuance costs			0	(3)
Payments of dividends to shareholders			(45)	(40)
Net proceeds from issuance of common stock			11	3
Payments to reacquire common stock			(58)	(4)
Distributions to noncontrolling interests			(23)	(3)
Other			0	(1)
Total cash flows (used in) provided by financing activities			(140)	41
Effect of exchange rate changes on cash			0	(11)
Increase in cash and equivalents			114	237
Cash and equivalents at beginning of period			436	712	$ 712
Cash and equivalents at end of period	550	949	550	949	$ 436
Noncash financing activities
Dividends declared	$ 15	$ 14	$ 15	$ 14

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements were prepared using generally accepted accounting principles for interim financial information and the instructions to Form 10-Q and Regulation S-X. Accordingly, these financial statements do not include all information or notes required by generally accepted accounting principles for annual financial statements and should be read together with our 2020 Annual Report on Form 10-K. The condensed consolidated financial statements include all normal and recurring adjustments necessary to present fairly our financial position as of September 30, 2021, and the results of our operations for the three and nine months ended September 30, 2021 and 2020, and our cash flows for the nine months ended September 30, 2021 and 2020. There are many factors that may affect the accuracy of our cost estimates and ultimately our future profitability. These include, but are not limited to, the availability and costs of resources (such as labor, materials and equipment), productivity and weather. We generally realize both lower and higher than expected margins on projects in any given period. We recognize revisions of revenues and costs in the period in which the revisions are known. This may result in the recognition of costs before the recognition of related revenue recovery, if any. Our significant accounting policies are detailed in "Note 1. Significant Accounting Policies" of our 2020 Annual Report on Form 10-K. We have evaluated all events and transactions occurring after the balance sheet date but before the financial statements were issued and have included the appropriate disclosures. Principles of Consolidation The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. GAAP and include the accounts of KBR, Inc. and the subsidiaries it controls, including VIEs where it is the primary beneficiary (collectively, the "Company," "KBR", "we", "us" or "our"). We account for investments over which we have significant influence, but not a controlling financial interest, using the equity method of accounting. See Note 8 to our condensed consolidated financial statements for further discussion of our equity investments and VIEs. All material intercompany balances and transactions are eliminated in consolidation. Segment Reorganization Effective January 1, 2021, we implemented a strategic change to the structure of our internal organization and transitioned from a three-core business segment model to a two-core business segment model comprised of Government Solutions and Sustainable Technology Solutions. The new Sustainable Technology Solutions segment is anchored by our innovative, proprietary process technologies. It also includes our highly synergistic advisory practice focused on energy transition and net-zero carbon emission consulting as well as the technology-led industrial solutions focused on innovative digital operations and maintenance ("O&M") solutions and advanced remote operations capabilities to improve throughput, reliability and environmental sustainability. Infusing high-end, sustainability expertise, client relationships and innovative, technology-led O&M solutions into Sustainable Technology Solutions is expected to increase resilience, generate new opportunities, simplify the business model and better position us to deliver its offerings across a broader industrial base. Effective January 1, 2021, we reorganized our reportable segments and businesses as follows: • Government Solutions includes the following four business units: Defense & Intel, formerly the Defense Systems Engineering and Centauri businesses; Science & Space, formerly called Space & Mission Solutions; Readiness & Sustainment, formerly called Logistics; and International. • Sustainable Technology Solutions includes Energy Solutions segment, Technology Solutions segment, and Non-strategic Business segment, with the exception of our Australian infrastructure business which moved to GS International in our Government Solutions segment. • Other We have presented our segment results reflecting these changes for all periods presented. See Note 2 to our condensed consolidated financial statements for further discussion on our segments. The following should be read together with Revenue Recognition in our significant accounting policies as detailed in "Note 1. Significant Accounting Policies" of our 2020 Annual Report on Form 10-K. Revenue Recognition Contract Types The Company performs work under contracts that broadly consists of fixed-price, cost-reimbursable, time-and-materials, or a combination of the three. Fixed-price contracts include both lump-sum and unit-rate contracts. Under lump-sum contracts, we perform a defined scope of work for a specified fee to cover all costs and any profit element. Lump-sum contracts entail significant risk to us because they require us to predetermine the work to be performed, the project execution schedule and all the costs associated with the scope of work. Unit-rate contracts are essentially fixed-price contracts with the only variable being units of work to be performed. Although fixed-price contracts involve greater risk than cost-reimbursable contracts, they also are potentially more profitable because the owner/customer pays a premium to transfer project risks to us. Time-and-materials contracts typically provide for negotiated fixed hourly rates for specified categories of direct labor. The rates cover the cost of direct labor, indirect expense and fee. These contracts can also allow for reimbursement of cost of material plus a fee, if applicable. In U.S. government contracting, this type of contract is generally used when there is uncertainty of the extent or duration of the work to be performed by the contractor at the time of contract award or it is not possible to anticipate costs with any reasonable degree of confidence. With respect to time-and-materials contracts, we assume the price risk because our costs of performance may exceed negotiated hourly rates. In commercial and non-U.S. government contracting, this contract is generally used for defined and non-defined scope contracts where there is a higher degree of uncertainty and risks as to the scope of work. These types of contracts may also provide for a guaranteed maximum price where the total cost plus the fee cannot exceed an agreed upon guaranteed maximum price or not-to-exceed provisions. Under cost-reimbursable contracts, the price is generally variable based upon our actual allowable costs incurred for materials, equipment, reimbursable labor hours, overhead, and general and administrative expenses. Profit on cost-reimbursable contracts may be in the form of a fixed fee or a mark-up applied to costs incurred, or a combination of the two. The fee may also be an incentive fee based on performance indicators, milestones or targets and can be based on customer discretion or in form of an award fee determined based on customer evaluation of the Company's performance against contractual criteria. Cost-reimbursable contracts may also provide for a guaranteed maximum price where the total fee plus the total cost cannot exceed an agreed upon guaranteed maximum price. Cost-reimbursable contracts are generally less risky because the owner/customer retains many of the project risks, however it generally requires us to use our best efforts to accomplish the scope of the work within a specified time and budget. Cost-reimbursable contracts with the U.S. government are generally subject to the Federal Acquisition Regulation ("FAR") and are competitively priced based on estimated or actual costs of providing the contractual goods or services. The FAR provides guidance on types of costs that are allowable in establishing prices for goods and services provided to the U.S. government and its agencies. Pricing for non-U.S. government agencies and commercial customers is based on specific negotiations with each customer. See Note 3 to our condensed consolidated financial statements for further discussion of our revenue by contract type. Additional Balance Sheet Information Other Current Liabilities The components of "Other current liabilities" on our condensed consolidated balance sheets as of September 30, 2021, and December 31, 2020, are presented below: September 30, December 31, Dollars in millions 2021 2020 Current maturities of long-term debt $ 16 $ 12 Reserve for estimated losses on uncompleted contracts 15 16 Retainage payable 12 22 Income taxes payable — 16 Restructuring reserve 20 32 Value-added tax payable 36 29 Dividend payable 16 14 Other miscellaneous liabilities 62 52 Total other current liabilities $ 177 $ 193

Business Segment Information

Business Segment Information	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Business Segment Information	Business Segment Information We provide a wide range of professional services and the management of our business is heavily focused on major projects or programs within each of our reportable segments. At any given time, government programs and joint ventures represent a substantial part of our operations. We are organized into two core business segments, Government Solutions and Sustainable Technology Solutions and one non-core business segment as described below: Government Solutions. Our Government Solutions business segment provides full life-cycle support solutions to defense, intelligence, space, aviation and other programs and missions for military and other government agencies primarily in the U.S., U.K. and Australia. KBR's services cover the full spectrum spanning research and development, advanced prototyping, acquisition support, systems engineering, C4ISR, cyber analytics, space domain awareness, test and evaluation, systems integration and program management, global supply chain management, and operations readiness and support. Sustainable Technology Solutions. Our Sustainable Technology Solutions business segment is anchored by our portfolio of over 70 innovative, proprietary, sustainability-focused process technologies that we license spanning four primary areas: ammonia/syngas/fertilizers, chemical/petrochemicals, clean refining and circular process/circular economy solutions. STS also includes our highly synergistic advisory and consulting practice focused on energy transition and net-zero carbon emission consulting, our high-end engineering, design and professional services offerings, as well as our technology-led industrial solutions build on our KBR INSITE ® platform. KBR INSITE ® is a proprietary, digital, cloud-based operations and maintenance platform that identifies opportunities for our clients to achieve sustainable improvements in production, reliability, environment impact, energy efficiency, and ultimately profitability. From early planning through scope definition, advanced technologies and facility life-cycle support, our STS business segment works closely with customers to provide what we believe is the optimal approach to maximize their return on investment. Other. Our non-core Other segment includes corporate expenses and selling, general and administrative expenses not allocated to the business segments above. Operations by Reportable Segment Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Dollars in millions Revenues: Government Solutions $ 1,555 $ 1,013 $ 3,950 $ 2,948 Sustainable Technology Solutions 288 366 890 1,353 Total revenues $ 1,843 $ 1,379 $ 4,840 $ 4,301 Gross profit: Government Solutions $ 147 $ 131 $ 393 $ 377 Sustainable Technology Solutions 46 41 175 123 Total gross profit $ 193 $ 172 $ 568 $ 500 Equity in earnings (losses) of unconsolidated affiliates: Government Solutions $ 11 $ 11 $ 26 $ 23 Sustainable Technology Solutions (12) 2 (201) 7 Total equity in earnings (losses) of unconsolidated affiliates (1) 13 $ (175) $ 30 Selling, general and administrative expenses: Government Solutions $ (44) $ (45) $ (142) $ (116) Sustainable Technology Solutions (16) (20) (51) (63) Other (31) (24) (90) (80) Total selling, general and administrative expenses (91) (89) $ (283) $ (259) Acquisition and integration related costs (3) (2) (7) (2) Goodwill impairment — — — (99) Restructuring charges and asset impairments — (1) (2) (176) Gain on disposition of assets and investments 3 — 1 18 Operating income $ 101 $ 93 $ 102 $ 12 Interest expense (23) (18) (68) (60) Other non-operating income (loss) (1) (4) (2) 1 Income (loss) before income taxes and noncontrolling interests $ 77 $ 71 $ 32 $ (47)

Revenue

Revenue	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Disaggregated Revenue We disaggregate our revenue from customers by business unit, geographic destination and contract type for each of our segments as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. Revenue by business unit and reportable segment was as follows: Three Months Ended Nine Months Ended September 30, September 30, Dollars in millions 2021 2020 2021 2020 Government Solutions Science & Space $ 280 $ 257 $ 788 $ 735 Defense & Intel 387 218 1,133 630 Readiness & Sustainment 632 292 1,276 847 International 256 246 753 736 Total Government Solutions 1,555 1,013 3,950 2,948 Sustainable Technology Solutions 288 366 890 1,353 Total revenue $ 1,843 $ 1,379 $ 4,840 $ 4,301 Government Solutions revenue earned from key U.S. government customers includes U.S. DoD and intelligence agencies, NASA, and other federal civilian agencies and is reported as Science & Space, Defense & Intel, and Readiness & Sustainment. Government Solutions revenue earned from non-U.S. government customers primarily includes the U.K. MoD and the Australian Defence Force and is reported as International. Revenue by geographic destination was as follows: Three Months Ended September 30, 2021 Total by Countries/Regions Dollars in millions Government Solutions Sustainable Technology Solutions Total United States $ 1,135 $ 104 $ 1,239 Middle East 72 50 122 Europe 215 57 272 Australia 93 4 97 Canada 1 1 2 Africa 23 23 46 Asia 4 43 47 Other countries 12 6 18 Total revenue $ 1,555 $ 288 $ 1,843 Three Months Ended September 30, 2020 Total by Countries/Regions Dollars in millions Government Solutions Sustainable Technology Solutions Total United States $ 559 $ 153 $ 712 Middle East 179 54 233 Europe 165 63 228 Australia 75 6 81 Canada 1 9 10 Africa 22 16 38 Asia — 37 37 Other countries 12 28 40 Total revenue $ 1,013 $ 366 $ 1,379 Nine Months Ended September 30, 2021 Total by Countries/Regions Dollars in millions Government Solutions Sustainable Technology Solutions Total United States $ 2,688 $ 326 $ 3,014 Middle East 348 148 496 Europe 549 162 711 Australia 260 8 268 Canada 1 2 3 Africa 61 67 128 Asia 5 145 150 Other countries 38 32 70 Total revenue $ 3,950 $ 890 $ 4,840 Nine Months Ended September 30, 2020 Total by Countries/Regions Dollars in millions Government Solutions Sustainable Technology Solutions Total United States $ 1,593 $ 600 $ 2,193 Middle East 537 177 714 Europe 514 160 674 Australia 201 46 247 Canada 1 40 41 Africa 60 53 113 Asia — 161 161 Other countries 42 116 158 Total revenue $ 2,948 $ 1,353 $ 4,301 Many of our contracts contain cost reimbursable, time-and-materials, and fixed price components. We define contract type based on the component that represents the majority of the contract. Revenue by contract type was as follows: Three Months Ended September 30, 2021 Dollars in millions Government Solutions Sustainable Technology Solutions Total Cost Reimbursable $ 1,063 $ — $ 1,063 Time-and-Materials 228 174 402 Fixed Price 264 114 378 Total revenue $ 1,555 $ 288 $ 1,843 Three Months Ended September 30, 2020 Dollars in millions Government Solutions Sustainable Technology Solutions Total Cost Reimbursable $ 610 $ — $ 610 Time-and-Materials 148 259 407 Fixed Price 255 107 362 Total revenue $ 1,013 $ 366 $ 1,379 Nine Months Ended September 30, 2021 Dollars in millions Government Solutions Sustainable Technology Solutions Total Cost Reimbursable $ 2,480 $ — $ 2,480 Time-and-Materials 666 551 1,217 Fixed Price 804 339 1,143 Total revenue $ 3,950 $ 890 $ 4,840 Nine Months Ended September 30, 2020 Dollars in millions Government Solutions Sustainable Technology Solutions Total Cost Reimbursable $ 1,763 $ — $ 1,763 Time-and-Materials 412 960 1,372 Fixed Price 773 393 1,166 Total revenue $ 2,948 $ 1,353 $ 4,301 Performance Obligations and Contract Liabilities We recognized revenue from performance obligations satisfied in previous periods of $4 million for the three months ended September 30, 2021 and we recognized revenue from performance obligations satisfied in the period of $14 million and $36 million for the nine months ended September 30, 2021 and 2020, respectively. On September 30, 2021, we had $11.2 billion of transaction price allocated to remaining performance obligations. We expect to recognize approximately 26% of our remaining performance obligations as revenue within one year, 33% in years two through five and 41% thereafter. Revenue associated with our remaining performance obligations to be recognized beyond one year includes performance obligations related to the Aspire Defence and Fasttrax projects, which have contract terms extending through 2041 and 2023, respectively. Remaining performance obligations do not include variable consideration that was determined to be constrained as of September 30, 2021. We recognized revenue of $147 million and $294 million for the nine months ended September 30, 2021 and 2020, respectively, which was previously included in the contract liability balance at the beginning of each period. Accounts Receivable September 30, December 31, Dollars in millions 2021 2020 Unbilled $ 791 $ 476 Trade & other 454 423 Accounts receivable $ 1,245 $ 899

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Acquisitions	Acquisitions Harmonic Limited On July 1, 2021, we acquired certain assets and assumed certain liabilities of Harmonic Limited ("Harmonic"). The acquired business of Harmonic provides transformation and delivery consultancy project services to UK businesses and is reported within our GS business segment. We accounted for this transaction as an acquisition of a business using the acquisition method under ASC 805, Business Combinations. The agreed-upon purchase price for the acquisition was $19 million, which consisted of cash paid at closing of $17 million, funded from cash on hand, and contingent consideration with an estimated fair value of $2 million that is contingent upon the achievement of certain performance targets over the period from closing through March 31, 2024. We recognized $2 million as an intangible backlog asset, $3 million in net working capital, and goodwill of $14 million arising from the acquisition, which relates primarily to future growth opportunities. As of September 30, 2021, the estimated fair values of net assets acquired were preliminary. The goodwill recognized is not deductible for tax purposes. Centauri Platform Holdings, LLC On October 1, 2020, we acquired Centauri Platform Holdings, LLC ("Centauri") for $830 million subject to certain working capital, net debt and other post-closing adjustments, if applicable. As of September 30, 2021, the estimated fair values of net assets acquired were preliminary, with possible updates primarily in our finalization of tax returns with the seller. The Company recognized goodwill of $576 million primarily related to future growth opportunities based on an expanded service offering from intellectual capital and a highly skilled assembled workforce and other expected synergies from the combined operations. Intangible assets of $226 million were recognized and comprised of customer relationships and backlog, which will be amortized over a weighted-average period of 13 years. For U.S. tax purposes, the transaction is treated as a stock deal. As a result, there is no step-up in tax basis and the goodwill and stepped-up acquired intangibles were not deductible for tax purposes. During the three and nine months ended September 30, 2021, the Company recognized direct, incremental costs related to this acquisition of $2 million and $4 million, respectively, which are included in "Acquisition and integration related costs" on the condensed consolidated statements of operations. The acquired Centauri business contributed $148 million and $461 million of revenues and $19 million and $56 million of gross profit for the three and nine months ended September 30, 2021, respectively. The following supplemental pro forma, combined financial information has been prepared from historical financial statements that have been adjusted to give effect to the acquisition of Centauri as though it had been acquired on January 1, 2020. Pro forma adjustments were primarily related to the amortization of intangibles, interest on borrowings related to the acquisition, significant nonrecurring transactions and acquisition related transaction costs. Accordingly, this supplemental pro forma financial information is presented for informational purposes only and is not necessarily indicative of what the actual results of operations of the combined company would have been had the acquisition occurred on January 1, 2020, nor is it indicative of future results of operations. Three Months Ended Nine Months Ended September 30, 2020 September 30, 2020 (Unaudited) (Unaudited) Revenue $ 1,537 $ 4,728 Net loss attributable to KBR $ 58 $ (83) Diluted earnings per share $ 0.40 $ (0.58) Scientific Management Associates (Operations) Pty Ltd On March 6, 2020, we acquired certain assets and assumed certain liabilities related to the government defense business of Scientific Management Associates (Operations) Pty Ltd ("SMA"). The acquired business of SMA provides technical training services to the Royal Australian Navy and is reported within our GS business segment. We accounted for this transaction using the acquisition method under ASC 805, Business Combinations. The agreed-upon purchase price for the acquisition was $13 million, less purchase price adjustments totaling $4 million resulting in net cash consideration paid of $9 million. We recognized goodwill of $12 million arising from the acquisition, which relates primarily to future growth opportunities to expand services provided to the Royal Australian Navy. During the first quarter of 2021, contingent consideration liability that was recorded at the time of acquisition was settled for $1 million. Frazer-Nash Consultancy Limited On October 20, 2021, we acquired Frazer-Nash Consultancy Limited ("Frazer-Nash") in accordance with an agreement with Babcock International Group PLC. The aggregate consideration paid was approximately $402 million, subject to certain working capital and other post-closing adjustments. The Company funded the aggregate consideration paid using borrowings under the Revolver of $294 million and international cash on hand of $108 million.

Cash and Equivalents

Cash and Equivalents	9 Months Ended
	Sep. 30, 2021
Cash and Cash Equivalents [Abstract]
Cash and Equivalents	Cash and Equivalents We consider all highly liquid investments with an original maturity of three months or less to be cash equivalents. Cash and equivalents include cash balances held by our wholly owned subsidiaries as well as cash held by joint ventures that we consolidate. Joint venture and the Aspire project cash balances are limited to specific project activities and are not available for other projects, general cash needs or distribution to us without approval of the board of directors of the respective entities. We expect to use this cash for project costs and distributions of earnings. The components of our cash and equivalents balance are as follows: September 30, 2021 Dollars in millions International (a) Domestic (b) Total Operating cash and equivalents $ 253 $ 126 $ 379 Short-term investments (c) 2 — 2 Cash and equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities 169 — 169 Total $ 424 $ 126 $ 550 December 31, 2020 Dollars in millions International (a) Domestic (b) Total Operating cash and equivalents $ 228 $ 54 $ 282 Short-term investments (c) 3 — 3 Cash and equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities 151 — 151 Total $ 382 $ 54 $ 436 (a) Includes deposits held in non-U.S. operating accounts. (b) Includes U.S. dollar and foreign currency deposits held in operating accounts that constitute onshore cash for tax purposes but may reside either in the U.S. or in a foreign country. (c) Includes time deposits, money market funds, and other highly liquid short-term investments.

Unapproved Change Orders and Cl

Unapproved Change Orders and Claims Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors	9 Months Ended
	Sep. 30, 2021
Contractors [Abstract]
Unapproved Change Orders and Claims Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors	Unapproved Change Orders and Claims Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors The amounts of unapproved change orders, and claims against clients and estimated recoveries of claims against suppliers and subcontractors included in determining the profit or loss on contracts are as follows: Dollars in millions September 30, 2021 September 30, 2020 Amounts included in project estimates-at-completion at January 1, $ 1,048 $ 978 (Decrease) increase in project estimates (228) (1) Approved change orders (374) (6) Foreign currency impact (19) 5 Amounts included in project estimates-at-completion at September 30, $ 427 $ 976 Amounts recognized over time based on progress at September 30,* $ 427 $ 976 (*) As of September 30, 2021, the balance above reflects the Settlement Agreement signed in October 2021. KBR and its joint ventures have been pursuing approval and collection of amounts due under major unapproved client change orders and subcontractor claims. The remaining commercial matters may not be resolved in the near term. Our current estimates for approval and recoveries may differ materially from the amounts we have recorded and could have a material adverse effect on our results of operations, financial position and cash flows. As of September 30, 2021 and 2020, the majority of unapproved change orders and claims against client and estimated recoveries of claims against suppliers and subcontractors relates to the Ichthys LNG Project discussed below. Ichthys LNG Project We have a 30% ownership interest in the JKC joint venture ("JKC"), which was contracted to perform the engineering, procurement, supply, construction and commissioning of onshore LNG facilities for a client in Darwin, Australia (the "Ichthys LNG Project"). The construction and commissioning of the Ichthys LNG Project is complete, and the facility has been handed over to the client and is producing LNG. Settlement Agreement with the Client In October 2021, JKC entered into a binding settlement agreement (the “Settlement Agreement”) that resolved the outstanding claims and disputes between JKC and its client, Ichthys LNG Pty, Ltd (collectively, “the Parties”). As a result of the Settlement Agreement, the Parties agreed to withdraw all claims and terminate all ongoing arbitrations and court proceedings between the Parties, including the following: • Under the cost-reimbursable scope of the contract, JKC believed amounts paid or payable to the suppliers and subcontractors in settlement of their contract claims related to the cost-reimbursable scope were an adjustment to the contract price. JKC made claims for such contract price adjustments; however, the client disputed some of these contract price adjustments. In order to facilitate the continuation of work, the client agreed to a contractual mechanism (“Funding Deed”) in 2016 providing funding in the form of an interim contract price adjustment to JKC, consented to settlement of subcontractor claims as of that date related to the cost-reimbursable scope, but reserved its right to dispute. In 2017, additional settlements pertaining to suppliers and subcontractors under the cost-reimbursable scope of the contract were presented to the client, and the client consented to payment to JKC but reserved its contractual rights. The Settlement Agreement fully resolved these matters capping JKC's recovery to amounts previously funded by the client. • JKC was entitled to an amount of profit and overhead which was a fixed percentage of the target reimbursable costs under the reimbursable component of the contract. The Parties were unable to reach agreement on incremental amounts claimed by JKC. The Settlement Agreement fully resolved this matter. • Claims for incurred costs related to scope increases and other factors for which JKC believed it is entitled to reimbursement under the contract along with claims asserted by the client. In connection with preliminary settlement discussions, the Company recorded a non-cash charge to equity in earnings of unconsolidated affiliates in the amount of $193 million in the quarter ended June 30, 2021, which reflected KBR’s proportionate share of the unpaid, unapproved change orders and claims. In the quarter ended September 30, 2021, KBR recorded an additional charge of approximately $10 million for its proportionate share of final warranty items. As part of the Settlement Agreement, KBR’s letters of credit were also reduced to $82 million from $164 million. The Settlement Agreement does not impact pursuit of, or positions related to, JKC’s subcontractor claims associated with the combined cycle power plant described below. Paint and Insulation Claims Against Insurer and Paint Manufacturer There has been deterioration of paint and insulation on certain exterior areas of the plant. As part of the Settlement Agreement, the Parties agreed to consult in good faith and to cooperate to seek maximum recovery from the insurance policies and paint manufacturer for the paint and insulation matters. The Parties agreed to collectively pursue claims against the paint manufacturer, and JKC has assigned claims under the insurance policy regarding the paint and insulation matters to the client. Under the Settlement Agreement, the parties have agreed that if, at the date of final resolution of the above proceedings and claims with respect to the paint and insulation matters, the recovered amount from the paint manufacturer and insurance claim is less than the stipulated ceiling amount in the Settlement Agreement, JKC will pay the client the difference between the stipulated ceiling amount and the recovered amount. JKC has provided for and continues to maintain its contingent liability. Combined Cycle Power Plant Pursuant to JKC's fixed-price scope of its contract with its client, JKC awarded a fixed-price EPC contract to a subcontractor for the design, construction and commissioning of the Combined Cycle Power Plant (the "Power Plant"). The subcontractor was a consortium consisting of General Electric and GE Electrical International Inc. and a joint venture between UGL Infrastructure Pty Limited and CH2M Hill (collectively, the "Consortium"). On January 25, 2017, JKC received a Notice of Termination from the Consortium, and the Consortium ceased work on the Power Plant and abandoned the construction site. JKC believes the Consortium materially breached its subcontract and repudiated its obligation to complete the Power Plant, plus undertook actions making it more difficult and more costly for the works to be completed by others after the Consortium abandoned the site. Subsequently, the Consortium filed a request for arbitration with the ICC asserting that JKC repudiated the contract. The Consortium also sought an order that the Consortium validly terminated the subcontract. JKC has responded to this request, denying JKC committed any breach of its subcontract with the Consortium and restated its claim that the Consortium breached and repudiated its subcontract with JKC and is liable to JKC for all costs to complete the Power Plant. In March 2017, JKC prevailed in a legal action against the Consortium requiring the return of materials, drawings and tools following their unauthorized removal from the site by the Consortium. After taking over the work, JKC discovered incomplete and defective engineering designs, defective workmanship on the site, missing, underreported and defective materials and the improper termination of key vendors/suppliers. JKC's investigations also indicate that progress of the work claimed by the Consortium was over-reported. JKC has completed the Consortium's work and the incurred costs significantly exceed the awarded fixed-price subcontract value. JKC's cost to complete the Power Plant includes re-design efforts, additional materials and significant re-work. JKC is pursuing recourse against the Consortium to recover all of the costs to complete the Power Plant, plus the additional interest, and/or general damages. Each of the Consortium partners has joint and several liability with respect to all obligations under the subcontract. Costs incurred to complete the Power Plant that have been determined to be probable of recovery from the Consortium under U.S. GAAP have been included as a reduction of cost in our estimate of profit at completion. The estimated recoveries exclude interest, liquidated damages and other related costs which JKC intends to pursue recovery from the Consortium. Amounts expected to be recovered from the Consortium are included in the table above at the beginning of this Note 6. As of September 30, 2021, JKC's claims against the Consortium were approximately $1.7 billion (net of subcontractor bonds and remaining original lump sum subcontract value) for recovery of JKC's costs. The opening hearing of the power plant arbitration was held in April 2021. The final hearing is expected to be held in April and May 2022. The previous hearing dates were vacated due to the COVID-19 delay and the current dates may continue to be impacted by the COVID-19 pandemic. JKC asked the Australian courts to require the parent company guarantors of the Consortium to issue payment to JKC in advance of the completion of the arbitration proceedings. The court concluded that the parent companies are responsible for Consortium’s liability resulting from the arbitration outcome, but they are not required to pay in advance of the arbitration. JKC continues to pursue the resolution of this matter and will seek collection from the Consortium and their parent guarantors who are all jointly and severally liable for any damages owed to JKC. To the extent JKC is unsuccessful in prevailing in the Arbitration or the Consortium members are unable to satisfy their financial obligations in the event of a decision favorable to JKC, we would be responsible for our pro-rata portion of unrecovered costs from the Consortium. This could have a material adverse impact on the profit at completion of the overall contract and thus on our consolidated statements of operations and financial position. See Note 8 "Equity Method Investments and Variable Interest Entities" to our condensed consolidated financial statements for further discussion regarding our equity method investment in JKC. Changes in all other Project-related Estimates There are many factors that may affect the accuracy of our cost estimates and ultimately our future profitability. These include, but are not limited to, the availability and costs of resources (such as labor, materials and equipment), productivity, weather, and ongoing resolution of legacy projects and legal matters. We generally realize both lower and higher than expected margins on projects in any given period. We recognize revisions of revenues and costs in the period in which the revisions are known. This may result in the recognition of costs before the recognition of related revenue recovery, if any. During the nine months ended September 30, 2021 within our STS business segment, we recognized a non-cash charge to equity in earnings of unconsolidated affiliates of $193 million as a result of changes in estimates on the Ichthys LNG project during the second quarter of 2021 and an additional $10 million charge for final warranty items during the third quarter of 2021. Additionally, during the nine months ended September 30, 2021, we recognized a favorable change of $37 million in gross profit associated with the settlement of a legacy EPC project matter, partially offset by $20 million related to the resolution of other legacy matters. During the nine months ended September 30, 2020, we recognized a favorable change of $16 million in estimated revenues and gross profit associated with variable consideration resulting from resolution of a contingency of a legacy EPC project during the first quarter of 2020.

Restructuring Charges

Restructuring Charges	9 Months Ended
	Sep. 30, 2021
Restructuring and Related Activities [Abstract]
Restructuring Charges	Restructuring Charges During 2020, our management initiated and approved a broad restructuring plan in response to the dislocation of the global energy market resulting from the decline in oil prices and the COVID-19 pandemic. As part of the plan, management approved strategic business restructuring activities and decided to discontinue pursuing certain projects, principally lump-sum EPC and commoditized construction services. The restructuring plan was designed to refine our market focus, optimize costs, and improve operational efficiencies. The restructuring charges were substantially completed in the year ended December 31, 2020. We recorded restructuring charges and asset impairments of $2 million for the nine months ended September 30, 2021. For the nine months ended September 30, 2020, we recorded restructuring charges and asset impairments as follows: Dollars in millions Severance Lease Abandonment Other Total Restructuring Charges Asset Impairments Total Restructuring Charges & Asset Impairments Government Solutions $ 1 $ — $ — $ 1 $ 2 $ 3 Sustainable Technology Solutions 33 3 — 36 50 86 Other 1 21 19 41 46 87 Total $ 35 $ 24 $ 19 $ 78 $ 98 $ 176 The restructuring liability at September 30, 2021, was $71 million, of which $20 million is included in "Other current liabilities" and $51 million is included in "Other liabilities." A reconciliation of the beginning and ending restructuring liability balances is provided in the following table. Dollars in millions Severance Lease Abandonment Other Total Balance at January 1, 2021 $ 15 $ 52 $ 24 $ 91 Lease restructuring charges related to operating lease liabilities — 2 — 2 Cash payments / settlements during the period (8) (5) (4) (17) Currency translation and other adjustments (2) — (3) (5) Balance at September 30, 2021 $ 5 $ 49 $ 17 $ 71

Equity Method Investments and V

Equity Method Investments and Variable Interest Entities	9 Months Ended
	Sep. 30, 2021
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments and Variable Interest Entities	Equity Method Investments and Variable Interest Entities We conduct some of our operations through joint ventures, which operate through partnerships, corporations and undivided interests and other business forms and are principally accounted for using the equity method of accounting. Additionally, the majority of our joint ventures are VIEs. The following table presents a rollforward of our equity in and advances to unconsolidated affiliates: Nine Months Ended September 30, Year Ended December 31, 2021 2020 Dollars in millions Beginning balance at January 1, $ 881 $ 846 Equity in earnings (losses) of unconsolidated affiliates (175) 30 Distributions of earnings of unconsolidated affiliates (37) (38) Advances to (payments from) unconsolidated affiliates, net (18) (15) Investments (a) 13 26 Impairment of equity method investments (b) — (19) Sale of equity method investment (c) (39) — Foreign currency translation adjustments (9) 50 Other (d) (26) 1 Ending balance $ 590 $ 881 (a) Investments include $10 million and $24 million in funding contributions to JKC for the nine months ended September 30, 2021, and the year ended December 31, 2020, respectively. (b) During the year ended December 31, 2020, we recognized an impairment of $13 million associated with our investment in a joint venture project located in the Middle East, and a $6 million impairment related to other equity method investments. (c) During the quarter ended September 30, 2021, we sold our investment interest in the Middle East Petroleum Corporation (EBIC Ammonia project). The carrying value of our investment was $39 million. We received $43 million in cash proceeds and recorded a gain of $4 million, of which $1 million was attributable to our non-controlling interests. Subsequent to the receipt of the cash proceeds, we distributed the non-controlling interests' proportionate share of $15 million. (d) During the nine months ended September 30, 2021, Other included unearned income related to the Ichthys LNG project, which was previously recorded outside of the equity method investment balance and will not be realized as a result of the settlement proceedings. See Note 6 "Unapproved Change Orders and Claims Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors" for additional information. Unconsolidated Variable Interest Entities For the VIEs in which we participate, our maximum exposure to loss consists of our equity investment in the VIE, any amounts owed to us for services we may have provided to the VIE and any amounts that we may be contractually or constructively obligated to fund in the future reduced by any unearned revenues on the project. Our maximum exposure to loss may also include our obligation to fund our proportionate share of any future losses incurred. Where our performance and financial obligations are joint and several to the client with our joint venture partners, we may be further exposed to losses above our ownership interest in the joint venture. The following summarizes the total assets and total liabilities related to our unconsolidated VIEs in which we have a significant variable interest but are not the primary beneficiary. September 30, 2021 Dollars in millions Total Assets Total Liabilities Affinity joint venture (U.K. MFTS project) $ 9 $ 8 Aspire Defence Limited $ 61 $ 5 JKC joint venture (Ichthys LNG project) $ 340 $ 3 U.K. Roads project joint ventures $ 54 $ — Middle East Petroleum Corporation (EBIC ammonia project) $ — $ — December 31, 2020 Dollars in millions Total Assets Total Liabilities Affinity joint venture (U.K. MFTS project) $ 11 $ 9 Aspire Defence Limited $ 68 $ 5 JKC joint venture (Ichthys LNG project) $ 606 $ 44 U.K. Roads project joint ventures $ 59 $ — Middle East Petroleum Corporation (EBIC ammonia project) $ 31 $ 1 Related Party Transactions We often provide engineering, construction management, and other subcontractor services to our unconsolidated joint ventures and our revenues include amounts related to these services. For the nine months ended September 30, 2021 and 2020, our revenues included $281 million and $379 million, respectively, related to the services we provided primarily to the Aspire Defence Limited joint venture within our GS business segment and two other joint ventures within our STS business segment. Amounts included in our condensed consolidated balance sheets related to services we provided to our unconsolidated joint ventures as of September 30, 2021, and December 31, 2020 are as follows: September 30, December 31, Dollars in millions 2021 2020 Accounts receivable, net of allowance for credit losses $ 45 $ 83 Contract assets (a) $ 2 $ 2 Contract liabilities (a) $ 8 $ 53 (a) Reflects contract assets and contract liabilities related to joint ventures within our GS and STS business segments. Consolidated Variable Interest Entities We consolidate VIEs if we determine we are the primary beneficiary of the project entity because we control the activities that most significantly impact the economic performance of the entity. The following is a summary of the significant VIEs where we are the primary beneficiary: Dollars in millions September 30, 2021 Total Assets Total Liabilities Fasttrax Limited (Fasttrax project) $ 20 $ 6 Aspire Defence subcontracting entities (Aspire Defence project) $ 479 $ 261 Dollars in millions December 31, 2020 Total Assets Total Liabilities Fasttrax Limited (Fasttrax project) $ 45 $ 18 Aspire Defence subcontracting entities (Aspire Defence project) $ 448 $ 205

Retirement Benefits

Retirement Benefits	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Retirement Benefits	Retirement Benefits The components of net periodic pension cost (benefit) related to pension benefits for the three and nine months ended September 30, 2021 and 2020 were as follows: Three Months Ended September 30, 2021 2020 Dollars in millions United States Int’l United States Int’l Components of net periodic pension cost (benefit) Service cost $ — $ 1 $ — $ 1 Interest cost $ — $ 8 $ — $ 9 Expected return on plan assets — (21) — (15) Amortization of prior service cost — — — — Recognized actuarial loss — 8 — 6 Net periodic pension cost (benefit) $ — $ (4) $ — $ 1 Nine Months Ended September 30, 2021 2020 Dollars in millions United States Int’l United States Int’l Components of net periodic pension cost (benefit) Service cost $ — $ 1 $ — $ 1 Interest cost $ 1 $ 24 $ 1 $ 28 Expected return on plan assets (2) (64) (2) (44) Amortization of prior service cost — 1 — 1 Recognized actuarial loss 1 24 1 17 Net periodic pension cost (benefit) $ — $ (14) $ — $ 3

Debt and Other Credit Facilitie

Debt and Other Credit Facilities	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Debt and Other Credit Facilities	Debt and Other Credit Facilities Our outstanding debt consisted of the following at the dates indicated: Dollars in millions September 30, 2021 December 31, 2020 Term Loan A $ 274 $ 285 Term Loan B 512 516 Convertible Senior Notes 350 350 Senior Notes 250 250 Senior Credit Facility 260 260 Unamortized debt issuance costs - Term Loan A (3) (4) Unamortized debt issuance costs and discount - Term Loan B (14) (16) Unamortized debt issuance costs and discount - Convertible Senior Notes (30) (40) Unamortized debt issuance costs and discount - Senior Notes (5) (5) Total debt 1,594 1,596 Less: current portion 16 12 Total long-term debt, net of current portion $ 1,578 $ 1,584 Senior Credit Facility On July 2, 2020, we amended our Senior Credit Facility to consist of a $1 billion revolving credit facility (the "Revolver"), a $275 million Loan A, ("Term Loan A") of which a portion is denominated in Australian dollars, and a $520 million Term Loan B ("Term Loan B"), with an aggregate capacity of $1.795 billion. The Revolver and Term Loan A mature in February 2025 and Term Loan B matures in February 2027. The interest rates with respect to the Revolver and Term Loan A are based on, at the Company's option, adjusted LIBOR plus an additional margin or base rate plus additional margin. The interest rate with respect to Term Loan B is LIBOR plus 2.75%. Additionally, there is a commitment fee with respect to the Revolver. The details of the applicable margins and commitment fees under the amended Senior Credit Facility are based on the Company's consolidated leverage ratio as follows: Revolver and Term Loan A Consolidated Leverage Ratio LIBOR Margin Base Rate Margin Commitment Fee Greater than or equal to 3.25 to 1.00 2.25 % 1.25 % 0.35 % Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 2.00 % 1.00 % 0.30 % Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 1.75 % 0.75 % 0.25 % Less than 1.25 to 1.00 1.50 % 0.50 % 0.20 % Term Loan A provides for quarterly principal payments of 0.625% of the aggregate principal amount commencing with the fiscal quarter ending June 30, 2020, increasing to 1.25% starting with the quarter ending June 30, 2022. Term Loan B provides for quarterly principal payments of 0.25% of the initial aggregate principal amounts commencing with the fiscal quarter ending June 30, 2020. The Senior Credit Facility contains financial covenants of a maximum consolidated leverage ratio and a consolidated interest coverage ratio (as such terms are defined in the Senior Credit Facility). Our consolidated leverage ratio as of the last day of any fiscal quarter may not exceed 4.25 to 1 through 2021, reducing to 4.00 to 1 in 2022 and 3.75 to 1 in 2023. Our consolidated interest coverage ratio as of the last day of any fiscal quarter, commencing with the fiscal quarter ending June 30, 2020 and thereafter, may not be less than 3.00 to 1. As of September 30, 2021, we were in compliance with our financial covenants related to our debt agreements. Convertible Senior Notes Convertible Senior Notes. On November 15, 2018, we issued and sold $350 million of 2.50% Convertible Senior Notes due 2023 (the "Convertible Notes") pursuant to an indenture between us and Citibank, N.A., as trustee. The Convertible Notes are senior unsecured obligations and bear interest at 2.50% per year, and interest is payable on May 1 and November 1 of each year. The Convertible Notes mature on November 1, 2023, and may not be redeemed by us prior to maturity. The Convertible Notes are convertible into cash, shares of our common stock or a combination of cash and shares of our common stock, at our election. It is our current intent and policy to settle the principal balance of the Convertible Notes in cash and any excess value upon conversion in shares of our common stock. The initial conversion price of the Convertible Notes is approximately $25.51 (subject to adjustment in certain circumstances), based on the initial conversion rate of 39.1961 Common Shares per $1,000 principal amount of Convertible Notes. Prior to May 1, 2023, the Convertible Notes will be convertible only upon the occurrence of certain events and during certain periods, and thereafter, until the close of business on the second scheduled trading day immediately preceding the maturity date. On August 21, 2021, we declared a quarterly cash dividend of $0.11 per Common Share, which exceeded our per share dividend threshold and adjusted the conversion rate to 39.4261 at a strike price of $25.36. The impact of dilution on our earnings per share from Convertible Notes is measured using the “treasury stock method”. As of September 30, 2021, the "if-converted" value of the Convertible Notes exceeded the $350 million principal amount by approximately $192 million. The net carrying value of the equity component related to the Convertible Senior Notes was $57 million as of September 30, 2021, and December 31, 2020. The amount of interest cost recognized relating to the contractual interest coupon was $2 million and $6 million for the three and nine months ended September 30, 2021 respectively, and $3 million and $7 million for the three and nine months ended September 30, 2020, respectively. The amount of interest cost recognized relating to the amortization of the discount and debt issuance costs was $3 million and $10 million for the three and nine months ended September 30, 2021, respectively, and $3 million and $9 million for the three and nine months ended September 30, 2020, respectively. The effective interest rate on the liability component was 6.50% as of September 30, 2021, and December 31, 2020. Convertible Notes Call Spread Overlay. Concurrent with the issuance of the Convertible Notes, we entered into privately negotiated convertible note hedge transactions (the "Note Hedge Transactions") and warrant transactions (the "Warrant Transactions") with the option counterparties. These transactions represent a call spread overlay, whereby the cost of the Note Hedge Transactions we purchased to cover the cash outlay upon conversion of the Convertible Notes was reduced by the sales price of the Warrant Transactions. Each of these transactions is described below. The Note Hedge Transactions cost an aggregate of $62 million and are expected generally to reduce the potential dilution of common stock and/or offset the cash payments we are required to make in excess of the principal amount upon conversion of the Convertible Notes in the event that the market price of our common stock is greater than the strike price of the Note Hedge Transactions, which was initially $25.51 (subject to adjustment), corresponding approximately to the initial conversion price of the Convertible Notes. The Note Hedge Transactions were accounted for by recording the cost as a reduction to "Additional paid-in capital" based on the Note Hedge Transactions meeting certain scope exceptions provided under ASC Topic 815. We received proceeds of $22 million for the Warrant Transactions, in which we sold net-share-settled warrants to the option counterparties in an amount equal to the number of shares of our common stock initially underlying the Convertible Notes, subject to customary anti-dilution adjustments. The original strike price of the warrants was $40.02 per share. The updated strike price as of September 30, 2021 was $39.79. The Warrant Transactions could have a dilutive effect to our stockholders to the extent the market price per share of our common stock, as measured under the terms of the Warrant Transactions, exceeds the applicable strike price of the warrants. The Warrant Transactions have been accounted for by recording the proceeds received as "Additional paid-in capital". The Note Hedge Transactions and the Warrant Transactions are separate transactions, in each case entered into by us with the option counterparties, and are not part of the terms of the Convertible Notes and will not affect any holder's rights under the Convertible Notes. Senior Notes On September 30, 2020, we issued and sold $250 million aggregate principal amount of 4.750% Senior Notes due 2028 (the "Senior Notes") pursuant to an indenture among us, the guarantors party thereto and Citibank, N.A., as trustee. The Senior Notes are senior unsecured obligations and are fully and unconditionally guaranteed by each of our existing and future domestic subsidiaries that guarantee our obligations under the Senior Credit Facility and certain other indebtedness. The net proceeds from the offering was approximately $245 million, after deducting fees and estimated offering expenses and were used to finance a portion of the purchase price for the acquisition of Centauri and pay related fees and expenses. Interest is payable semi-annually in arrears on March 30 and September 30 of each year, beginning on March 30, 2021, and the principal is due on September 30, 2028. At any time prior to September 30, 2023, we may redeem all or part of the Senior Notes at a redemption price equal to 100% of the principal amount of the Senior Notes redeemed, plus accrued and unpaid interest, if any, to (but not including) the redemption date, plus a specified “make-whole premium.” On or after September 30, 2023, we may redeem all or part of the Senior Notes at our option, at the redemption prices set forth in the Senior Notes, plus accrued and unpaid interest, if any, to (but not including) the redemption date. At any time prior to September 30, 2023, we may redeem up to 35% of the original aggregate principal amount of the Senior Notes with the net cash proceeds of certain equity offerings at a redemption price equal to 104.750% of the principal amount of the Senior Notes, together with accrued and unpaid interest, if any, to (but not including) the redemption date. If we undergo a change of control, we may be required to make an offer to holders of the Senior Notes to repurchase all of the Senior Notes at a purchase price equal to 101% of the principal amount thereof, plus accrued and unpaid interest. Letters of credit, surety bonds and guarantees In connection with certain projects, we are required to provide letters of credit, surety bonds or guarantees to our customers in the ordinary course of business as credit support for contractual performance guarantees, advanced payments received from customers and future funding commitments. As of September 30, 2021, we had $1 billion in a committed line of credit under the Senior Credit Facility and $415 million of uncommitted lines of credit to support the issuance of letters of credit. As of September 30, 2021, with respect to our Senior Credit Facility, we had $260 million of outstanding borrowings previously issued to fund the acquisition of Centauri and $122 million of outstanding letters of credit. With respect to our $415 million of uncommitted lines of credit, we had utilized $213 million for letters of credit as of September 30, 2021. The total remaining capacity of these committed and uncommitted lines of credit was approximately $820 million. Of the letters of credit outstanding under the Senior Credit Facility, none have expiry dates beyond the maturity date of the Senior Credit Facility. Of the total letters of credit outstanding, $168 million relate to our joint venture operations where the letters of credit are posted using our capacity to support our pro-rata share of obligations under various contracts executed by joint ventures of which we are a member. Nonrecourse Project Debt Fasttrax Limited, a consolidated joint venture in which we indirectly own a 50% equity interest with an unrelated partner, was awarded a concession contract in 2001 with the U.K. MoD to provide a Heavy Equipment Transporter Service to the British Army. Fasttrax Limited operates and maintains 91 HETs for a term of 22 years. The purchase of the HETs by the joint venture was financed through two series of bonds secured by the assets of Fasttrax Limited and subordinated debt from the joint venture partners. The secured bonds are an obligation of Fasttrax Limited and are not a debt obligation of KBR as they are nonrecourse to the joint venture partners. Accordingly, in the event of a default on the notes, the lenders may only look to the assets of Fasttrax Limited for repayment. The secured bonds were issued in two classes consisting of Class A 3.5% Index Linked Bonds in the amount of £56.0 million and Class B 5.9% Fixed Rate Bonds in the amount of £20.7 million. Semi-annual payments on both classes of bonds continued through maturity in March 2021. The subordinated notes payable to each of the partners initially bear interest at 11.25% increasing to 16.00% over the term of the notes until maturity in 2025. For financial reporting purposes, only our partner's portion of the subordinated notes appears in the condensed consolidated financial statements.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesThe effective tax rate was approximately 25% and 234% for the three and nine months ended September 30, 2021, respectively. The effective tax rate was approximately 27% and (51)% for the three and nine months ended September 30, 2020, respectively. The effective tax rate for the nine months ended September 30, 2021, as compared to the U.S. statutory rate of 21%, was primarily impacted by an equity adjustment on an LNG project and the enactment of a tax rate change in the United Kingdom. Equity adjustments were booked on an entity in which KBR is a JV partner in the second and third quarter of 2021. Since the tax impact for this adjustment was taxed at the JV level, KBR will not receive a tax benefit. In the second quarter of 2021, the U.K. enacted legislation to raise the corporate tax rate from 19% to 25% beginning April 1, 2023. All deferred tax balances in this region were remeasured and the tax impact was booked accordingly. Excluding the tax impact of these adjustments, our tax rate would be 19% and 23% for the three and nine months ended September 30, 2021. The three and nine months ended September 30, 2020 was primarily impacted by impairment and restructuring charges incurred during the period. Excluding the tax impact of these adjustments, our tax rate would have been 27% for the three and nine months ended September 30, 2020. Our estimated annual effective rate for 2021 is 23% excluding the effects of discrete items. Our estimated annual effective rate is subject to change based on the actual jurisdictions where our 2021 earnings are generated. The valuation allowance for deferred tax assets as of September 30, 2021 and December 31, 2020 was $210 million and $220 million, respectively. The remaining valuation allowance is primarily related to foreign tax credit carryforwards and foreign and state net operating loss carryforwards that, in the judgment of management, are not more likely than not to be realized. The ultimate realization of deferred tax assets is dependent on the generation of future taxable income, in the appropriate character and source, during the periods in which those temporary differences become deductible or within the remaining carryforward period. Management considers the scheduled reversal of deferred tax liabilities (including the impact of available carryback and carryforward periods), projected future taxable income and tax-planning strategies in making this assessment. The utilization of the unreserved foreign tax credit carryforwards is based on our ability to generate income from foreign sources of approximately $662 million prior to their expiration. The utilization of other net deferred tax assets, excluding those associated with indefinite-lived intangible assets, is based on our ability to generate U.S. forecasted taxable income of approximately $614 million. Changes in our forecasted taxable income, in the appropriate character and source, as well as jurisdiction, could affect the ultimate realization of deferred tax assets. The provision for uncertain tax positions included in "Other liabilities" and "Deferred income taxes" on our condensed consolidated balance sheets as of September 30, 2021, and December 31, 2020 was $93 million and $96 million, respectively.

Claims and Accounts Receivable

Claims and Accounts Receivable	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Claims and Accounts Receivable	Claims and Accounts Receivable Our claims and accounts receivable balance not expected to be collected within the next 12 months was $30 million as of September 30, 2021, and December 31, 2020. Claims and accounts receivable primarily reflect claims filed with the U.S. government related to payments not yet received for costs incurred under various U.S. government cost reimbursable contracts within our GS business segment. These claims relate to disputed costs or contracts where our costs have exceeded the U.S. government's funded value on the task order and included in the amount is $1 million as of September 30, 2021, and December 31, 2020. The amount also includes $29 million as of September 30, 2021 and December 31, 2020, related to contracts where our reimbursable costs have exceeded the U.S. government's funded values on the underlying task orders or task orders where the U.S. government has not authorized us to bill. We believe the remaining disputed costs will be resolved in our favor, at which time the U.S. government will be required to obligate funds from appropriations for the year in which resolution occurs.

U.S. Government Matters

U.S. Government Matters	9 Months Ended
	Sep. 30, 2021
United States Government Contract Work [Abstract]
U.S. Government Matters	U.S. Government Matters We provide services to various U.S. governmental agencies, including the U.S. DoD, NASA, and the Department of State. We may have disagreements or experience performance issues on our U.S. government contracts. When performance issues arise under any of these contracts, the U.S. government retains the right to pursue various remedies, including challenges to expenditures, suspension of payments, fines and suspensions or debarment from future business with the U.S. government. The negotiation, administration and settlement of our contracts are subject to audit by the DCAA. The DCAA serves in an advisory role to the DCMA, which is responsible for the administration of the majority of our contracts. The scope of these audits includes, among other things, the validity of direct and indirect incurred costs, provisional approval of annual billing rates, approval of annual overhead rates, compliance with the FAR and CAS, compliance with certain unique contract clauses and audits of certain aspects of our internal control systems. Based on the information received to date, we do not believe any completed or ongoing government audits will have a material adverse impact on our results of operations, financial position or cash flows. Legacy U.S. Government Matters Between 2002 and 2011, we provided significant support to the U.S. Army and other U.S. government agencies in support of the war in Iraq under the LogCAP III contract. We have been in the process of closing out the LogCAP III contract since 2011, and we expect the contract closeout process to continue for at least another year. As a result of our work under LogCAP III, there are claims and disputes pending between us and the U.S. government that need to be resolved in order to close the contract. The contract closeout process includes resolving objections raised by the U.S. government through a billing dispute process referred to as Form 1s and MFRs. We continue to work with the U.S. government to resolve these issues and are engaged in efforts to reach mutually acceptable resolutions of these outstanding matters. However, for certain of these matters, we have filed claims with the ASBCA or the COFC. We also have matters related to ongoing litigation or investigations involving U.S. government contracts. We anticipate billing additional labor, vendor resolution and litigation costs as we resolve the open matters in the future. The Company established a reserve for unallowable costs associated with open government matters related to the heritage KBR U.S. Government Services business in the amounts of $33 million as of September 30, 2021, and December 31, 2020, and are recorded in “Other liabilities.” Investigations, Qui Tams and Litigation The following matters relate to ongoing litigation or federal investigations involving U.S. government contracts. Many of these matters involve allegations of violations of the FCA, which prohibits in general terms fraudulent billings to the U.S. government. Suits brought by private individuals are called "qui tams." In the event we prevail in defending these allegations, a majority of our defense costs will be billable under the LogCAP III contract. All costs billed under LogCAP III are subject to audit by the DCAA for reasonableness. First Kuwaiti Trading Company arbitration. In April 2008, FKTC, one of our LogCAP III subcontractors providing housing containers, filed for arbitration with the American Arbitration Association all its claims under various LogCAP III subcontracts. After complete hearings on all claims, the arbitration panel awarded FKTC $17 million plus interest for claims involving damages on lost or unreturned vehicles. In addition, we determined that we owe FKTC $32 million in connection with other subcontracts provided we are reimbursed for these same costs by the U.S. government. We lost our claims against the government as referenced below and have exercised our offset or clawback rights as against FKTC in the arbitration. FKTC does not agree with our right of offset and a final hearing will be needed to resolve this issue and our other counterclaims against FKTC. A hearing has been set for January 2022. Management accrued an amount that it feels is adequate to cover either liability as determined by the panel or a negotiated settlement with FKTC on this matter. Howard qui tam. In March 2011, Geoffrey Howard and Zella Hemphill filed a complaint in the U.S. District Court for the Central District of Illinois alleging that KBR mischarged the government $628 million for unnecessary materials and equipment. In October 2014, the DOJ declined to intervene and the case was partially unsealed. Depositions of some DCMA and KBR personnel have taken place and more which were expected to occur in early 2020 were postponed due to COVID-19 but resumed in 2021. KBR and the relators filed various motions including a motion to dismiss by KBR. Although KBR's motion to dismiss was not granted, it remains an option on appeal. The deadline for all fact discovery and depositions has been extended due to COVID-19 travel restrictions and related delays and discovery continues. We believe the allegations of fraud by the relators are without merit and, as of September 30, 2021, no amounts have been accrued. DOJ False Claims Act complaint - Iraq Subcontractor. In January 2014, the DOJ filed a complaint in the U.S. District Court for the Central District of Illinois against KBR and two former KBR subcontractors, including FKTC, alleging that three former KBR employees were offered and accepted kickbacks from these subcontractors in exchange for favorable treatment in the award and performance of subcontracts to be awarded during the course of KBR's performance of the LogCAP III contract in Iraq. The complaint alleges that as a result of the kickbacks, KBR submitted invoices with inflated or unjustified subcontract prices, resulting in alleged violations of the FCA and the Anti-Kickback Act. The DOJ's investigation dates back to 2004. We self-reported most of the violations and tendered credits to the U.S. government as appropriate. On May 22, 2014, FKTC filed a motion to dismiss, which the U.S. government opposed. Following the submission of our answer in April 2014, the U.S. government was granted a Motion to Strike certain affirmative defenses in March 2015. We do not believe this limits KBR's ability to fully defend all allegations in this matter. Discovery for this complaint is now mostly complete. On March 30, 2020, the Court granted KBR’s motion to transfer the case to the Southern District of Texas and the court allowed one additional deposition to take place. KBR and the U.S. government have filed various dispositive motions which remained under consideration by the Court for an extended period. In March 2021, while granting some of KBR’s motions for summary judgment, the court also concluded that we breached the FCA as a matter of law as to several subcontracts. We filed for two motions for reconsideration, one addressing the ruling on KBR’s motion for summary judgment and one addressing the U.S. government’s motion. A preliminary meeting was held and the Court issued a ruling on both motions, granting in part and denying in part on both motions. The Court also set a trial date for February 2022 and told the parties that no further motions would be considered. Despite that ruling, the U.S. government filed a Motion of Clarification which is now pending. As of September 30, 2021, we have accrued our best estimate of probable loss related to an unfavorable settlement of this matter in "Other liabilities" on our condensed consolidated balance sheets. Other matters KBR Contract Claim on FKTC containers.

Other Commitments And Contingen

Other Commitments And Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Other Commitments and Contingencies	Other Commitments and Contingencies Chadian Employee Class Action. In May 2018, former employees of our former Chadian subsidiary, Subsahara Services, Inc. ("SSI"), filed a class action suit claiming unpaid damages arising from the ESSO Chad Development Project for Exxon Mobil Corporation ("Exxon") dating back to the early 2000s. Exxon is also named as a defendant in the case. The SSI employees previously filed two class action cases in or around 2005 and 2006 for alleged unpaid overtime and bonuses. The Chadian Labour Court ruled in favor of the SSI employees for unpaid overtime resulting in a settlement of approximately $25 million which was reimbursed by Exxon under its contract with SSI. The second case for alleged unpaid bonuses was ultimately dismissed by the Supreme Court of Chad. The current case claims $122 million in unpaid bonuses characterized as damages rather than employee bonuses to avoid the previous Chadian Supreme Court dismissal and a 5-year statute of limitations on wage-related claims. SSI’s initial defense was filed and a hearing was held in December 2018. A merits hearing was held in February 2019. In March 2019, the Labour Court issued a decision awarding the plaintiffs approximately $34 million including a $2 million provisional award. Exxon and SSI have appealed the award and requested suspension of the provisional award which was approved on April 2, 2019. Exxon and SSI filed a submission to the Court of Appeal on June 21, 2019, and filed briefs at a hearing on February 28, 2020. The plaintiffs failed to file a response on March 13, 2020, and a hearing was scheduled for April 17, 2020. The hearing was postponed due to COVID-19 but took place on September 18, 2020. On October 9, 2020, the appellate court of Moundou awarded the plaintiffs approximately $19 million. SSI filed an appeal of this decision to the Chadian Supreme Court on December 28, 2020. SSI’s request for suspension on the enforceability of the award from the Chadian Supreme Court was granted on January 4, 2021, and therefore there is no current risk of enforcement of the judgment. At this time, we do not believe a risk of material loss is probable related to this matter. SSI is no longer an existing entity in Chad or the United States. Further, we believe any amounts ultimately paid to the former employees related to this adverse ruling would be reimbursable by Exxon based on the applicable contract. North West Rail Link Project. We participate in an unincorporated joint venture with two partners to provide engineering and design services in relation to the operations, trains and systems of a metro rail project in Sydney, Australia. The project commenced in 2014 and during its execution encountered delays and disputes resulting in claims and breach notices submitted to the joint venture by the client. Since November 2018, the client has submitted multiple claims alleging breach of contract and breach of duty by the joint venture in its execution of the services, claiming losses and damages of up to approximately $300 million Australian dollars. We currently believe the gross amount of the claims significantly exceeds the client’s entitlement as well as the joint venture’s limits of liability under the contract and that the claims will be covered by project-specific professional indemnity insurance subject to deductibles.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Changes in AOCL, net of tax, by component Dollars in millions Accumulated foreign currency translation adjustments Accumulated pension liability adjustments Changes in fair value of derivatives Total Balance at December 31, 2020 $ (291) $ (764) $ (28) $ (1,083) Other comprehensive income adjustments before reclassifications (6) — 9 3 Amounts reclassified from AOCL 2 20 9 31 Net other comprehensive income (loss) (4) 20 18 34 Balance at September 30, 2021 $ (295) $ (744) $ (10) $ (1,049) Dollars in millions Accumulated foreign currency translation adjustments Accumulated pension liability adjustments Changes in fair value of derivatives Total Balance at December 31, 2019 $ (315) $ (654) $ (18) $ (987) Other comprehensive income adjustments before reclassifications (15) — (20) (35) Amounts reclassified from AOCL (12) 15 5 8 Net other comprehensive income (loss) (27) 15 (15) (27) Balance at September 30, 2020 $ (342) $ (639) $ (33) $ (1,014) Reclassifications out of AOCL, net of tax, by component Nine Months Ended September 30, Dollars in millions 2021 2020 Affected line item on the Condensed Consolidated Statements of Operations Accumulated foreign currency adjustments Reclassification of foreign currency adjustments $ (2) $ 12 Gain on disposition of assets and investments and Net income (loss) attributable to noncontrolling interests Tax benefit — — Provision for income taxes Net accumulated foreign currency $ (2) $ 12 Net of tax Accumulated pension liability adjustments Amortization of actuarial loss (a) $ (25) $ (18) See (a) below Tax benefit 5 3 Provision for income taxes Net pension and post-retirement benefits $ (20) $ (15) Net of tax Changes in fair value for derivatives Foreign currency hedge and interest rate swap settlements $ (12) $ (6) Other non-operating income (loss) Tax benefit 3 1 Provision for income taxes Net changes in fair value of derivatives $ (9) $ (5) Net of tax (a) This item is included in the computation of net periodic pension cost. See Note 9 "Retirement Benefits" to our condensed consolidated financial statements for further discussion.

Share Repurchases

Share Repurchases	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Share Repurchases	Share Repurchases Authorized Share Repurchase Program On February 25, 2014, the Board of Directors authorized a plan to repurchase up to $350 million of our outstanding shares of common stock, which replaced and terminated the August 26, 2011 share repurchase program. As of December 31, 2019, $160 million remained available under this authorization. On February 19, 2020, the Board of Directors authorized an increase of approximately $190 million to our share repurchase program, returning the authorization level to $350 million. As of September 30, 2021, $250 million remains available for repurchase under this authorization. The authorization does not obligate the Company to acquire any particular number of shares of common stock and may be commenced, suspended or discontinued without prior notice. The share repurchases are intended to be funded through the Company's current and future cash flows and the authorization does not have an expiration date. Withheld to Cover Program We have in place a "withheld to cover" program, which allows us to withhold common shares from employees in connection with the settlement of income tax and related benefit withholding obligations arising from the issuance of share-based equity awards under the KBR, Inc. 2006 Stock and Incentive Plan. The table below presents information on our share repurchases activity under these programs: Three Months Ended Nine Months Ended September 30, 2021 September 30, 2021 Number of Shares Average Price per Share Dollars in Millions Number of Shares Average Price per Share Dollars in Millions Repurchases under the $350 million authorized share repurchase program 647,173 $ 38.61 $ 25 1,328,457 $ 39.78 $ 53 Withheld to cover shares 3,448 $ 38.47 — 144,697 $ 32.06 $ 4 Total 650,621 $ 38.61 $ 25 1,473,154 $ 39.02 $ 57 Three Months Ended Nine Months Ended September 30, 2020 September 30, 2020 Number of Shares Average Price per Share Dollars in Millions Number of Shares Average Price per Share Dollars in Millions Repurchases under the $350 million authorized share repurchase program — $ — $ — — $ — $ — Withheld to cover shares 4,914 $ 23.06 — 165,046 $ 25.66 $ 4 Total 4,914 $ 23.06 $ — 165,046 $ 25.66 $ 4

Income (loss) per Share

Income (loss) per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Income (loss) per Share	Income (loss) per Share Basic income (loss) per share is based upon the weighted average number of common shares outstanding during the period. Dilutive income (loss) per share includes additional common shares that would have been outstanding if potential common shares with a dilutive effect had been issued using the treasury stock method. A reconciliation of the number of shares used for the basic and diluted income per share calculations is as follows: Three Months Ended September 30, Nine Months Ended September 30, Shares in millions 2021 2020 2021 2020 Basic weighted average common shares outstanding 140 142 141 142 Stock options, restricted shares, and convertible debt (a) 5 — — — Diluted weighted average common shares outstanding (b) 145 142 141 142 (a) For the three months ended September 30, 2021, there was a diluted impact related to our convertible debt. (b) In periods for which we report a net loss attributable to KBR, basic net loss per share and diluted net loss per share are identical as the effect of all potential common shares is anti-dilutive and therefore excluded. For purposes of applying the two-class method in computing income (loss) per share, there were $0.3 million net earnings allocated to participating securities, or a negligible amount per share, for the three months ended September 30, 2021 and 2020. There were no net earnings allocated to participating securities for the nine months ended September 30, 2021 and 2020. The diluted income per share calculation did not include antidilutive weighted average shares for three months ended September 30, 2021, and did not include 0.1 million antidilutive weighted average shares for the nine months ended September 30, 2021. The diluted income (loss) per share calculation did not include 1.2 million antidilutive weighted average shares for the three and nine months ended September 30, 2020.

Fair Value of Financial Instrum

Fair Value of Financial Instruments and Risk Management	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments and Risk Management	Fair Value of Financial Instruments and Risk Management Fair value measurements. The fair value of an asset or liability is the price that would be received to sell an asset or transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company utilizes a fair value hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value and defines three levels of inputs that may be used to measure fair value. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, or inputs derived from observable market data. Level 3 inputs are unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities. The carrying amount of cash and equivalents, accounts receivable and accounts payable, as reflected in the condensed consolidated balance sheets, approximates fair value due to the short-term maturities of these financial instruments. The carrying values and estimated fair values of our financial instruments that are not required to be recorded at fair value in our condensed consolidated balance sheets are provided in the following table. September 30, 2021 December 31, 2020 Dollars in millions Carrying Value Fair Value Carrying Value Fair Value Liabilities (including current maturities): Term Loan A Level 2 $ 274 $ 274 $ 285 $ 285 Term Loan B Level 2 512 513 516 517 Convertible Notes Level 2 350 564 350 480 Senior Notes Level 2 250 256 250 262 Senior Credit Facility Level 2 ` 260 260 260 260 Nonrecourse project debt Level 2 2 2 7 7 See Note 10 "Debt and Other Credit Facilities" for further discussion of our term loans, convertibles notes, and nonrecourse project debt. The following disclosures for foreign currency risk and interest rate risk includes the fair value hierarchy levels for our assets and liabilities that are measured at fair value on a recurring basis. Foreign currency risk. We conduct business globally in numerous currencies and are therefore exposed to foreign currency fluctuations. We may use derivative instruments to reduce the volatility of earnings and cash flows associated with changes in foreign currency exchange rates. We do not use derivative instruments for speculative trading purposes. We generally utilize foreign exchange forwards and currency option contracts to hedge exposures associated with forecasted future cash flows and to hedge exposures present on our balance sheet. As of September 30, 2021, the gross notional value of our foreign currency exchange forwards and option contracts used to hedge balance sheet exposures was $76 million, all of which had durations of 15 days or less. The fair value of our balance sheet and cash flow hedges included in "Other current assets" and "Other current liabilities" on our condensed consolidated balance sheets was immaterial at September 30, 2021, and December 31, 2020. The fair values of these derivatives are considered Level 2 under ASC 820, Fair Value Measurement, as they are based on quoted prices directly observable in active markets. The following table summarizes the recognized changes in fair value of our balance sheet hedges offset by remeasurement of balance sheet positions. These amounts are recognized in our condensed consolidated statements of operations for the periods presented. The net of our changes in fair value of hedges and the remeasurement of our assets and liabilities is included in "Other non-operating income (expense)" on our condensed consolidated statements of operations. Three Months Ended Nine Months Ended September 30, September 30, Gains (losses) dollars in millions 2021 2020 2021 2020 Balance Sheet Hedges - Fair Value $ 1 $ (2) $ — $ (2) Balance Sheet Position - Remeasurement (1) (2) (6) 4 Net $ — $ (4) $ (6) $ 2 Interest rate risk. We use interest rate swaps to reduce interest rate risk and to manage net interest expense by converting our LIBOR-rate based loans into fixed-rate loans. In October 2018, we entered into interest rate swap agreements with a notional value of $500 million, which are effective beginning October 2018 and mature in September 2022. Under the October 2018 swap agreements, we receive a one-month LIBOR rate and pay a monthly fixed rate of 3.055% for the term of the swaps. In March 2020, we entered into additional swap agreements with a notional value of $400 million, which are effective beginning October 2022 and mature in January 2027. Under the March 2020 swap agreements, we will receive a one-month LIBOR rate and pay a monthly fixed rate of 0.965% for the term of the swaps. Our interest rate swaps are reported at fair value using Level 2 inputs. The fair value of the interest rate swaps at September 30, 2021, was a $11 million net liability, of which $15 million is included in "Other current liabilities," none is included in "Other liabilities," and $4 million is included in "Other assets." The unrealized net losses on these interest rate swaps was $11 million and is included in "AOCL" as of September 30, 2021. The fair value of the interest rate swaps at December 31, 2020, was a $33 million liability, of which $15 million is included in "Other current liabilities" and $18 million is included in "Other liabilities." The unrealized net losses on these interest rate swaps was $33 million and included in "AOCL" as of December 31, 2020. Credit Losses. We are exposed to credit losses primarily related to our professional services, project delivery, and technologies offered in our STS business segment. We do not consider our GS business segment to be at risk for credit losses because substantially all services within this segment are provided to agencies of the U.S., U.K. and Australian governments. We determined our allowance for credit losses by using a loss-rate methodology, in which we assessed our historical write-off of receivables against our total receivables and contract asset balances over several years. From this historical loss-rate approach, we also considered the current and forecasted economic conditions expected to be in place over the life of our receivables and contract assets. We monitor our ongoing credit exposure through an active review of our customers’ receivables balance against contract terms and due dates. Our activities include timely performance of our accounts receivable reconciliations, assessment of our aging of receivables, dispute resolution and payment confirmation. We also monitor any change in our historical write-off of receivables utilized in our loss-rate methodology and assess for any forecasted change in market conditions to adjust our credit reserve. At September 30, 2021, our STS business segment that is subject to credit risk reported approximately $321 million of financial assets consisting primarily of accounts receivable and contract assets, net of allowances of $13 million. Although there continues to be an economic disruption resulting from the impact of COVID-19, changes in our credit loss reserve was not material for the nine months ended September 30, 2021. Based on an aging analysis at September 30, 2021, 81% of our accounts receivable related to this segment were outstanding for less than 90 days. Sales of Receivables. From time to time, we sell certain receivables to unrelated third-party financial institutions under various accounts receivable monetization programs. One such program is with MUFG Bank, Ltd. (“MUFG”) under a Master Accounts Receivable Purchase Agreement (the “RPA”), which provides the sale to MUFG of certain of our designated eligible receivables, with a significant portion of such receivables being owed by the U.S. government. The receivables sold under the agreements do not allow for recourse for any credit risk related to our customers if such receivables are not collected by the third-party financial institutions. The Company accounts for these receivable transfers as a sale under ASC Topic 860, Transfers and Servicing, as the receivables have been legally isolated from the Company, the financial institution has the right to pledge or exchange the assets received and we do not maintain effective control over the transferred accounts receivable. Our only continuing involvement with the transferred financial assets is as the collection and servicing agent. As a result, the accounts receivable balance on the condensed consolidated balance sheets is presented net of the transferred amount. The Company has derecognized $1,609 million of accounts receivables from the balance sheet under these agreements, of which certain receivables totaling $1,583 million were sold under the MUFG RPA as of September 30, 2021. The fair value of the sold receivables approximated their book value due to their short-term nature. The fees incurred are presented in “Other non-operating income (loss)” on the condensed consolidated statements of operations. Activity for third-party financial institutions consisted of the following: Nine Months Ended Nine Months Ended Dollars in millions September 30, 2021 September 30, 2020 Beginning balance $ 112 — Sale of receivables 1,609 61 Settlement of receivables (1,600) (37) Cash collected, not yet remitted (8) — Outstanding balances sold to financial institutions $ 113 $ 24

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements New accounting pronouncements requiring implementation in future periods are discussed below. In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) - Facilitation of the Effects of the Interbank Offered Rate Transition on Financial Reporting to provide optional relief from applying generally accepted accounting principles to contracts, hedging relationships and other transactions affected by reference rate reform. In addition, in January 2021, the FASB issued ASU No. 2021-01, Reference Rate Reform (Topic 848) – Scope, to clarify that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. The guidance is effective upon issuance and generally can be applied through December 31, 2022. We are currently evaluating the future impact of adoption of this standard. In August 2020, the FASB issued ASU No. 2020-06, Debt-Debt Conversion and other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Equity's Own Equity. This guidance simplifies the accounting for convertible instruments by reducing the number of accounting models available for convertible debt instruments. This guidance also eliminates the treasury stock method to calculate diluted earnings per share for certain convertible instruments and requires the use of the if-converted method. ASU 2020-06 is effective for us for annual reporting periods beginning after December 15, 2021, and for interim periods within those annual periods, and can be applied utilizing either a modified or full retrospective transition method. We are currently evaluating the future impact of adoption of this standard. In May 2021, the FASB issued ASU No. 2021-04. Earnings Per Share (Topic 260), Debt - Modifications and Extinguishments (Subtopic 470-50), Compensation - Stock Compensation (Topic 718), and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40): Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options. This ASU provides guidance for a modification or an exchange of a freestanding equity-classified written call option that is not within the scope of another Topic. It specifically addresses measurement, treatment and recognition of a freestanding equity-classified written call option modification or exchange. ASU No. 2021-04 is effective for all entities for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. We are currently evaluating the future impact of adoption of this standard.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles of Consolidation	Principles of Consolidation The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. GAAP and include the accounts of KBR, Inc. and the subsidiaries it controls, including VIEs where it is the primary beneficiary (collectively, the "Company," "KBR", "we", "us" or "our"). We account for investments over which we have significant influence, but not a controlling financial interest, using the equity method of accounting. See Note 8 to our condensed consolidated financial statements for further discussion of our equity investments and VIEs. All material intercompany balances and transactions are eliminated in consolidation.
Segment Reorganization	Segment Reorganization Effective January 1, 2021, we implemented a strategic change to the structure of our internal organization and transitioned from a three-core business segment model to a two-core business segment model comprised of Government Solutions and Sustainable Technology Solutions. The new Sustainable Technology Solutions segment is anchored by our innovative, proprietary process technologies. It also includes our highly synergistic advisory practice focused on energy transition and net-zero carbon emission consulting as well as the technology-led industrial solutions focused on innovative digital operations and maintenance ("O&M") solutions and advanced remote operations capabilities to improve throughput, reliability and environmental sustainability. Infusing high-end, sustainability expertise, client relationships and innovative, technology-led O&M solutions into Sustainable Technology Solutions is expected to increase resilience, generate new opportunities, simplify the business model and better position us to deliver its offerings across a broader industrial base. Effective January 1, 2021, we reorganized our reportable segments and businesses as follows: • Government Solutions includes the following four business units: Defense & Intel, formerly the Defense Systems Engineering and Centauri businesses; Science & Space, formerly called Space & Mission Solutions; Readiness & Sustainment, formerly called Logistics; and International. • Sustainable Technology Solutions includes Energy Solutions segment, Technology Solutions segment, and Non-strategic Business segment, with the exception of our Australian infrastructure business which moved to GS International in our Government Solutions segment. • Other
Revenue Recognition	Revenue Recognition Contract Types The Company performs work under contracts that broadly consists of fixed-price, cost-reimbursable, time-and-materials, or a combination of the three. Fixed-price contracts include both lump-sum and unit-rate contracts. Under lump-sum contracts, we perform a defined scope of work for a specified fee to cover all costs and any profit element. Lump-sum contracts entail significant risk to us because they require us to predetermine the work to be performed, the project execution schedule and all the costs associated with the scope of work. Unit-rate contracts are essentially fixed-price contracts with the only variable being units of work to be performed. Although fixed-price contracts involve greater risk than cost-reimbursable contracts, they also are potentially more profitable because the owner/customer pays a premium to transfer project risks to us. Time-and-materials contracts typically provide for negotiated fixed hourly rates for specified categories of direct labor. The rates cover the cost of direct labor, indirect expense and fee. These contracts can also allow for reimbursement of cost of material plus a fee, if applicable. In U.S. government contracting, this type of contract is generally used when there is uncertainty of the extent or duration of the work to be performed by the contractor at the time of contract award or it is not possible to anticipate costs with any reasonable degree of confidence. With respect to time-and-materials contracts, we assume the price risk because our costs of performance may exceed negotiated hourly rates. In commercial and non-U.S. government contracting, this contract is generally used for defined and non-defined scope contracts where there is a higher degree of uncertainty and risks as to the scope of work. These types of contracts may also provide for a guaranteed maximum price where the total cost plus the fee cannot exceed an agreed upon guaranteed maximum price or not-to-exceed provisions.
Impact of Adoption of New Accounting Standards and Recent Accounting Pronouncements	In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) - Facilitation of the Effects of the Interbank Offered Rate Transition on Financial Reporting to provide optional relief from applying generally accepted accounting principles to contracts, hedging relationships and other transactions affected by reference rate reform. In addition, in January 2021, the FASB issued ASU No. 2021-01, Reference Rate Reform (Topic 848) – Scope, to clarify that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. The guidance is effective upon issuance and generally can be applied through December 31, 2022. We are currently evaluating the future impact of adoption of this standard. In August 2020, the FASB issued ASU No. 2020-06, Debt-Debt Conversion and other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Equity's Own Equity. This guidance simplifies the accounting for convertible instruments by reducing the number of accounting models available for convertible debt instruments. This guidance also eliminates the treasury stock method to calculate diluted earnings per share for certain convertible instruments and requires the use of the if-converted method. ASU 2020-06 is effective for us for annual reporting periods beginning after December 15, 2021, and for interim periods within those annual periods, and can be applied utilizing either a modified or full retrospective transition method. We are currently evaluating the future impact of adoption of this standard. In May 2021, the FASB issued ASU No. 2021-04. Earnings Per Share (Topic 260), Debt - Modifications and Extinguishments (Subtopic 470-50), Compensation - Stock Compensation (Topic 718), and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40): Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options. This ASU provides guidance for a modification or an exchange of a freestanding equity-classified written call option that is not within the scope of another Topic. It specifically addresses measurement, treatment and recognition of a freestanding equity-classified written call option modification or exchange. ASU No. 2021-04 is effective for all entities for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. We are currently evaluating the future impact of adoption of this standard.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components of other current liabilities on our condensed consolidated balance sheets	The components of "Other current liabilities" on our condensed consolidated balance sheets as of September 30, 2021, and December 31, 2020, are presented below: September 30, December 31, Dollars in millions 2021 2020 Current maturities of long-term debt $ 16 $ 12 Reserve for estimated losses on uncompleted contracts 15 16 Retainage payable 12 22 Income taxes payable — 16 Restructuring reserve 20 32 Value-added tax payable 36 29 Dividend payable 16 14 Other miscellaneous liabilities 62 52 Total other current liabilities $ 177 $ 193

Business Segment Information (T

Business Segment Information (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Schedule of operations by reportable segment	Operations by Reportable Segment Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Dollars in millions Revenues: Government Solutions $ 1,555 $ 1,013 $ 3,950 $ 2,948 Sustainable Technology Solutions 288 366 890 1,353 Total revenues $ 1,843 $ 1,379 $ 4,840 $ 4,301 Gross profit: Government Solutions $ 147 $ 131 $ 393 $ 377 Sustainable Technology Solutions 46 41 175 123 Total gross profit $ 193 $ 172 $ 568 $ 500 Equity in earnings (losses) of unconsolidated affiliates: Government Solutions $ 11 $ 11 $ 26 $ 23 Sustainable Technology Solutions (12) 2 (201) 7 Total equity in earnings (losses) of unconsolidated affiliates (1) 13 $ (175) $ 30 Selling, general and administrative expenses: Government Solutions $ (44) $ (45) $ (142) $ (116) Sustainable Technology Solutions (16) (20) (51) (63) Other (31) (24) (90) (80) Total selling, general and administrative expenses (91) (89) $ (283) $ (259) Acquisition and integration related costs (3) (2) (7) (2) Goodwill impairment — — — (99) Restructuring charges and asset impairments — (1) (2) (176) Gain on disposition of assets and investments 3 — 1 18 Operating income $ 101 $ 93 $ 102 $ 12 Interest expense (23) (18) (68) (60) Other non-operating income (loss) (1) (4) (2) 1 Income (loss) before income taxes and noncontrolling interests $ 77 $ 71 $ 32 $ (47)

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Schedule of disaggregation of revenue	Revenue by business unit and reportable segment was as follows: Three Months Ended Nine Months Ended September 30, September 30, Dollars in millions 2021 2020 2021 2020 Government Solutions Science & Space $ 280 $ 257 $ 788 $ 735 Defense & Intel 387 218 1,133 630 Readiness & Sustainment 632 292 1,276 847 International 256 246 753 736 Total Government Solutions 1,555 1,013 3,950 2,948 Sustainable Technology Solutions 288 366 890 1,353 Total revenue $ 1,843 $ 1,379 $ 4,840 $ 4,301 Revenue by geographic destination was as follows: Three Months Ended September 30, 2021 Total by Countries/Regions Dollars in millions Government Solutions Sustainable Technology Solutions Total United States $ 1,135 $ 104 $ 1,239 Middle East 72 50 122 Europe 215 57 272 Australia 93 4 97 Canada 1 1 2 Africa 23 23 46 Asia 4 43 47 Other countries 12 6 18 Total revenue $ 1,555 $ 288 $ 1,843 Three Months Ended September 30, 2020 Total by Countries/Regions Dollars in millions Government Solutions Sustainable Technology Solutions Total United States $ 559 $ 153 $ 712 Middle East 179 54 233 Europe 165 63 228 Australia 75 6 81 Canada 1 9 10 Africa 22 16 38 Asia — 37 37 Other countries 12 28 40 Total revenue $ 1,013 $ 366 $ 1,379 Nine Months Ended September 30, 2021 Total by Countries/Regions Dollars in millions Government Solutions Sustainable Technology Solutions Total United States $ 2,688 $ 326 $ 3,014 Middle East 348 148 496 Europe 549 162 711 Australia 260 8 268 Canada 1 2 3 Africa 61 67 128 Asia 5 145 150 Other countries 38 32 70 Total revenue $ 3,950 $ 890 $ 4,840 Nine Months Ended September 30, 2020 Total by Countries/Regions Dollars in millions Government Solutions Sustainable Technology Solutions Total United States $ 1,593 $ 600 $ 2,193 Middle East 537 177 714 Europe 514 160 674 Australia 201 46 247 Canada 1 40 41 Africa 60 53 113 Asia — 161 161 Other countries 42 116 158 Total revenue $ 2,948 $ 1,353 $ 4,301 Many of our contracts contain cost reimbursable, time-and-materials, and fixed price components. We define contract type based on the component that represents the majority of the contract. Revenue by contract type was as follows: Three Months Ended September 30, 2021 Dollars in millions Government Solutions Sustainable Technology Solutions Total Cost Reimbursable $ 1,063 $ — $ 1,063 Time-and-Materials 228 174 402 Fixed Price 264 114 378 Total revenue $ 1,555 $ 288 $ 1,843 Three Months Ended September 30, 2020 Dollars in millions Government Solutions Sustainable Technology Solutions Total Cost Reimbursable $ 610 $ — $ 610 Time-and-Materials 148 259 407 Fixed Price 255 107 362 Total revenue $ 1,013 $ 366 $ 1,379 Nine Months Ended September 30, 2021 Dollars in millions Government Solutions Sustainable Technology Solutions Total Cost Reimbursable $ 2,480 $ — $ 2,480 Time-and-Materials 666 551 1,217 Fixed Price 804 339 1,143 Total revenue $ 3,950 $ 890 $ 4,840 Nine Months Ended September 30, 2020 Dollars in millions Government Solutions Sustainable Technology Solutions Total Cost Reimbursable $ 1,763 $ — $ 1,763 Time-and-Materials 412 960 1,372 Fixed Price 773 393 1,166 Total revenue $ 2,948 $ 1,353 $ 4,301
Schedule of accounts receivable	September 30, December 31, Dollars in millions 2021 2020 Unbilled $ 791 $ 476 Trade & other 454 423 Accounts receivable $ 1,245 $ 899

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Schedule of Pro Forma Information	Three Months Ended Nine Months Ended September 30, 2020 September 30, 2020 (Unaudited) (Unaudited) Revenue $ 1,537 $ 4,728 Net loss attributable to KBR $ 58 $ (83) Diluted earnings per share $ 0.40 $ (0.58)

Cash and Equivalents (Tables)

Cash and Equivalents (Tables)	9 Months Ended
	Sep. 30, 2021
Cash and Cash Equivalents [Abstract]
Schedule of components of our cash and equivalents balance	The components of our cash and equivalents balance are as follows: September 30, 2021 Dollars in millions International (a) Domestic (b) Total Operating cash and equivalents $ 253 $ 126 $ 379 Short-term investments (c) 2 — 2 Cash and equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities 169 — 169 Total $ 424 $ 126 $ 550 December 31, 2020 Dollars in millions International (a) Domestic (b) Total Operating cash and equivalents $ 228 $ 54 $ 282 Short-term investments (c) 3 — 3 Cash and equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities 151 — 151 Total $ 382 $ 54 $ 436 (a) Includes deposits held in non-U.S. operating accounts. (b) Includes U.S. dollar and foreign currency deposits held in operating accounts that constitute onshore cash for tax purposes but may reside either in the U.S. or in a foreign country. (c) Includes time deposits, money market funds, and other highly liquid short-term investments.

Unapproved Change Orders and _2

Unapproved Change Orders and Claims Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors (Tables)	9 Months Ended
	Sep. 30, 2021
Contractors [Abstract]
Schedule of unapproved claims and change orders	The amounts of unapproved change orders, and claims against clients and estimated recoveries of claims against suppliers and subcontractors included in determining the profit or loss on contracts are as follows: Dollars in millions September 30, 2021 September 30, 2020 Amounts included in project estimates-at-completion at January 1, $ 1,048 $ 978 (Decrease) increase in project estimates (228) (1) Approved change orders (374) (6) Foreign currency impact (19) 5 Amounts included in project estimates-at-completion at September 30, $ 427 $ 976 Amounts recognized over time based on progress at September 30,* $ 427 $ 976 (*) As of September 30, 2021, the balance above reflects the Settlement Agreement signed in October 2021.

Restructuring Charges (Tables)

Restructuring Charges (Tables)	9 Months Ended
	Sep. 30, 2021
Restructuring and Related Activities [Abstract]
Schedule of restructuring charges and asset impairments	The restructuring charges were substantially completed in the year ended December 31, 2020. We recorded restructuring charges and asset impairments of $2 million for the nine months ended September 30, 2021. For the nine months ended September 30, 2020, we recorded restructuring charges and asset impairments as follows: Dollars in millions Severance Lease Abandonment Other Total Restructuring Charges Asset Impairments Total Restructuring Charges & Asset Impairments Government Solutions $ 1 $ — $ — $ 1 $ 2 $ 3 Sustainable Technology Solutions 33 3 — 36 50 86 Other 1 21 19 41 46 87 Total $ 35 $ 24 $ 19 $ 78 $ 98 $ 176
Schedule of reconciliation of beginning and ending restructuring liability	A reconciliation of the beginning and ending restructuring liability balances is provided in the following table. Dollars in millions Severance Lease Abandonment Other Total Balance at January 1, 2021 $ 15 $ 52 $ 24 $ 91 Lease restructuring charges related to operating lease liabilities — 2 — 2 Cash payments / settlements during the period (8) (5) (4) (17) Currency translation and other adjustments (2) — (3) (5) Balance at September 30, 2021 $ 5 $ 49 $ 17 $ 71

Equity Method Investments and_2

Equity Method Investments and Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2021
Equity Method Investments and Joint Ventures [Abstract]
Schedule of equity in earnings of unconsolidated affiliates	The following table presents a rollforward of our equity in and advances to unconsolidated affiliates: Nine Months Ended September 30, Year Ended December 31, 2021 2020 Dollars in millions Beginning balance at January 1, $ 881 $ 846 Equity in earnings (losses) of unconsolidated affiliates (175) 30 Distributions of earnings of unconsolidated affiliates (37) (38) Advances to (payments from) unconsolidated affiliates, net (18) (15) Investments (a) 13 26 Impairment of equity method investments (b) — (19) Sale of equity method investment (c) (39) — Foreign currency translation adjustments (9) 50 Other (d) (26) 1 Ending balance $ 590 $ 881 (a) Investments include $10 million and $24 million in funding contributions to JKC for the nine months ended September 30, 2021, and the year ended December 31, 2020, respectively. (b) During the year ended December 31, 2020, we recognized an impairment of $13 million associated with our investment in a joint venture project located in the Middle East, and a $6 million impairment related to other equity method investments. (c) During the quarter ended September 30, 2021, we sold our investment interest in the Middle East Petroleum Corporation (EBIC Ammonia project). The carrying value of our investment was $39 million. We received $43 million in cash proceeds and recorded a gain of $4 million, of which $1 million was attributable to our non-controlling interests. Subsequent to the receipt of the cash proceeds, we distributed the non-controlling interests' proportionate share of $15 million. (d) During the nine months ended September 30, 2021, Other included unearned income related to the Ichthys LNG project, which was previously recorded outside of the equity method investment balance and will not be realized as a result of the settlement proceedings. See Note 6 "Unapproved Change Orders and Claims Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors" for additional information.
Schedule of consolidated summarized financial information	The following summarizes the total assets and total liabilities related to our unconsolidated VIEs in which we have a significant variable interest but are not the primary beneficiary. September 30, 2021 Dollars in millions Total Assets Total Liabilities Affinity joint venture (U.K. MFTS project) $ 9 $ 8 Aspire Defence Limited $ 61 $ 5 JKC joint venture (Ichthys LNG project) $ 340 $ 3 U.K. Roads project joint ventures $ 54 $ — Middle East Petroleum Corporation (EBIC ammonia project) $ — $ — December 31, 2020 Dollars in millions Total Assets Total Liabilities Affinity joint venture (U.K. MFTS project) $ 11 $ 9 Aspire Defence Limited $ 68 $ 5 JKC joint venture (Ichthys LNG project) $ 606 $ 44 U.K. Roads project joint ventures $ 59 $ — Middle East Petroleum Corporation (EBIC ammonia project) $ 31 $ 1
Schedule of services provided to unconsolidated JV's	Amounts included in our condensed consolidated balance sheets related to services we provided to our unconsolidated joint ventures as of September 30, 2021, and December 31, 2020 are as follows: September 30, December 31, Dollars in millions 2021 2020 Accounts receivable, net of allowance for credit losses $ 45 $ 83 Contract assets (a) $ 2 $ 2 Contract liabilities (a) $ 8 $ 53 (a) Reflects contract assets and contract liabilities related to joint ventures within our GS and STS business segments.
Summary of the significant VIEs	The following is a summary of the significant VIEs where we are the primary beneficiary: Dollars in millions September 30, 2021 Total Assets Total Liabilities Fasttrax Limited (Fasttrax project) $ 20 $ 6 Aspire Defence subcontracting entities (Aspire Defence project) $ 479 $ 261 Dollars in millions December 31, 2020 Total Assets Total Liabilities Fasttrax Limited (Fasttrax project) $ 45 $ 18 Aspire Defence subcontracting entities (Aspire Defence project) $ 448 $ 205

Retirement Benefits (Tables)

Retirement Benefits (Tables)	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Schedule of net periodic benefit costs	The components of net periodic pension cost (benefit) related to pension benefits for the three and nine months ended September 30, 2021 and 2020 were as follows: Three Months Ended September 30, 2021 2020 Dollars in millions United States Int’l United States Int’l Components of net periodic pension cost (benefit) Service cost $ — $ 1 $ — $ 1 Interest cost $ — $ 8 $ — $ 9 Expected return on plan assets — (21) — (15) Amortization of prior service cost — — — — Recognized actuarial loss — 8 — 6 Net periodic pension cost (benefit) $ — $ (4) $ — $ 1 Nine Months Ended September 30, 2021 2020 Dollars in millions United States Int’l United States Int’l Components of net periodic pension cost (benefit) Service cost $ — $ 1 $ — $ 1 Interest cost $ 1 $ 24 $ 1 $ 28 Expected return on plan assets (2) (64) (2) (44) Amortization of prior service cost — 1 — 1 Recognized actuarial loss 1 24 1 17 Net periodic pension cost (benefit) $ — $ (14) $ — $ 3

Debt and Other Credit Facilit_2

Debt and Other Credit Facilities (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Schedule of outstanding debt	Our outstanding debt consisted of the following at the dates indicated: Dollars in millions September 30, 2021 December 31, 2020 Term Loan A $ 274 $ 285 Term Loan B 512 516 Convertible Senior Notes 350 350 Senior Notes 250 250 Senior Credit Facility 260 260 Unamortized debt issuance costs - Term Loan A (3) (4) Unamortized debt issuance costs and discount - Term Loan B (14) (16) Unamortized debt issuance costs and discount - Convertible Senior Notes (30) (40) Unamortized debt issuance costs and discount - Senior Notes (5) (5) Total debt 1,594 1,596 Less: current portion 16 12 Total long-term debt, net of current portion $ 1,578 $ 1,584 The details of the applicable margins and commitment fees under the amended Senior Credit Facility are based on the Company's consolidated leverage ratio as follows: Revolver and Term Loan A Consolidated Leverage Ratio LIBOR Margin Base Rate Margin Commitment Fee Greater than or equal to 3.25 to 1.00 2.25 % 1.25 % 0.35 % Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 2.00 % 1.00 % 0.30 % Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 1.75 % 0.75 % 0.25 % Less than 1.25 to 1.00 1.50 % 0.50 % 0.20 %

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Schedule of accumulated other comprehensive income (loss)	Changes in AOCL, net of tax, by component Dollars in millions Accumulated foreign currency translation adjustments Accumulated pension liability adjustments Changes in fair value of derivatives Total Balance at December 31, 2020 $ (291) $ (764) $ (28) $ (1,083) Other comprehensive income adjustments before reclassifications (6) — 9 3 Amounts reclassified from AOCL 2 20 9 31 Net other comprehensive income (loss) (4) 20 18 34 Balance at September 30, 2021 $ (295) $ (744) $ (10) $ (1,049) Dollars in millions Accumulated foreign currency translation adjustments Accumulated pension liability adjustments Changes in fair value of derivatives Total Balance at December 31, 2019 $ (315) $ (654) $ (18) $ (987) Other comprehensive income adjustments before reclassifications (15) — (20) (35) Amounts reclassified from AOCL (12) 15 5 8 Net other comprehensive income (loss) (27) 15 (15) (27) Balance at September 30, 2020 $ (342) $ (639) $ (33) $ (1,014)
Schedule of reclassification out of accumulated other comprehensive income	Reclassifications out of AOCL, net of tax, by component Nine Months Ended September 30, Dollars in millions 2021 2020 Affected line item on the Condensed Consolidated Statements of Operations Accumulated foreign currency adjustments Reclassification of foreign currency adjustments $ (2) $ 12 Gain on disposition of assets and investments and Net income (loss) attributable to noncontrolling interests Tax benefit — — Provision for income taxes Net accumulated foreign currency $ (2) $ 12 Net of tax Accumulated pension liability adjustments Amortization of actuarial loss (a) $ (25) $ (18) See (a) below Tax benefit 5 3 Provision for income taxes Net pension and post-retirement benefits $ (20) $ (15) Net of tax Changes in fair value for derivatives Foreign currency hedge and interest rate swap settlements $ (12) $ (6) Other non-operating income (loss) Tax benefit 3 1 Provision for income taxes Net changes in fair value of derivatives $ (9) $ (5) Net of tax (a) This item is included in the computation of net periodic pension cost. See Note 9 "Retirement Benefits" to our condensed consolidated financial statements for further discussion.

Share Repurchases (Tables)

Share Repurchases (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Schedule of shares repurchased	The table below presents information on our share repurchases activity under these programs: Three Months Ended Nine Months Ended September 30, 2021 September 30, 2021 Number of Shares Average Price per Share Dollars in Millions Number of Shares Average Price per Share Dollars in Millions Repurchases under the $350 million authorized share repurchase program 647,173 $ 38.61 $ 25 1,328,457 $ 39.78 $ 53 Withheld to cover shares 3,448 $ 38.47 — 144,697 $ 32.06 $ 4 Total 650,621 $ 38.61 $ 25 1,473,154 $ 39.02 $ 57 Three Months Ended Nine Months Ended September 30, 2020 September 30, 2020 Number of Shares Average Price per Share Dollars in Millions Number of Shares Average Price per Share Dollars in Millions Repurchases under the $350 million authorized share repurchase program — $ — $ — — $ — $ — Withheld to cover shares 4,914 $ 23.06 — 165,046 $ 25.66 $ 4 Total 4,914 $ 23.06 $ — 165,046 $ 25.66 $ 4

Income (loss) per Share (Tables

Income (loss) per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Schedule of reconciliation of the number of shares used for the basic and diluted income per share calculations	A reconciliation of the number of shares used for the basic and diluted income per share calculations is as follows: Three Months Ended September 30, Nine Months Ended September 30, Shares in millions 2021 2020 2021 2020 Basic weighted average common shares outstanding 140 142 141 142 Stock options, restricted shares, and convertible debt (a) 5 — — — Diluted weighted average common shares outstanding (b) 145 142 141 142 (a) For the three months ended September 30, 2021, there was a diluted impact related to our convertible debt. (b) In periods for which we report a net loss attributable to KBR, basic net loss per share and diluted net loss per share are identical as the effect of all potential common shares is anti-dilutive and therefore excluded.

Fair Value of Financial Instr_2

Fair Value of Financial Instruments and Risk Management (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Schedule of carrying values and estimated fair values of financial instruments	The carrying values and estimated fair values of our financial instruments that are not required to be recorded at fair value in our condensed consolidated balance sheets are provided in the following table. September 30, 2021 December 31, 2020 Dollars in millions Carrying Value Fair Value Carrying Value Fair Value Liabilities (including current maturities): Term Loan A Level 2 $ 274 $ 274 $ 285 $ 285 Term Loan B Level 2 512 513 516 517 Convertible Notes Level 2 350 564 350 480 Senior Notes Level 2 250 256 250 262 Senior Credit Facility Level 2 ` 260 260 260 260 Nonrecourse project debt Level 2 2 2 7 7
Schedule of derivatives instruments statements of financial performance and financial position, location	The following table summarizes the recognized changes in fair value of our balance sheet hedges offset by remeasurement of balance sheet positions. These amounts are recognized in our condensed consolidated statements of operations for the periods presented. The net of our changes in fair value of hedges and the remeasurement of our assets and liabilities is included in "Other non-operating income (expense)" on our condensed consolidated statements of operations. Three Months Ended Nine Months Ended September 30, September 30, Gains (losses) dollars in millions 2021 2020 2021 2020 Balance Sheet Hedges - Fair Value $ 1 $ (2) $ — $ (2) Balance Sheet Position - Remeasurement (1) (2) (6) 4 Net $ — $ (4) $ (6) $ 2
Schedule of sale of receivables activity	Activity for third-party financial institutions consisted of the following: Nine Months Ended Nine Months Ended Dollars in millions September 30, 2021 September 30, 2020 Beginning balance $ 112 — Sale of receivables 1,609 61 Settlement of receivables (1,600) (37) Cash collected, not yet remitted (8) — Outstanding balances sold to financial institutions $ 113 $ 24

Basis of Presentation (Narrativ

Basis of Presentation (Narrative) (Details)	Sep. 30, 2021business_unitsegment	Jan. 01, 2021segment	Dec. 31, 2020segment
Segment Reporting Information [Line Items]
Core business segments, number | segment	2	2	3
Government Solutions
Segment Reporting Information [Line Items]
Number of business units | business_unit	4

Basis of Presentation (Balance

Basis of Presentation (Balance Sheet Additional Disclosure) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Current maturities of long-term debt	$ 16	$ 12
Reserve for estimated losses on uncompleted contracts	15	16
Retainage payable	12	22
Income taxes payable	0	16
Restructuring reserve	20	32
Value-added tax payable	36	29
Dividend payable	16	14
Other miscellaneous liabilities	62	52
Total other current liabilities	$ 177	$ 193

Business Segment Information (N

Business Segment Information (Narrative) (Details)	9 Months Ended
	Sep. 30, 2021process_technologysegmentarea	Jan. 01, 2021segment	Dec. 31, 2020segment
Segment Reporting Information [Line Items]
Core business segments, number	2	2	3
Non-core business segments, number	1
Sustainable Technology Solutions
Segment Reporting Information [Line Items]
Number of process technologies (over) | process_technology	70
Number of primary areas | area	4

Business Segment Information (S

Business Segment Information (Schedule of Operations by Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 1,843	$ 1,379	$ 4,840	$ 4,301
Total gross profit	193	172	568	500
Total equity in earnings (losses) of unconsolidated affiliates	(1)	13	(175)	30
Total selling, general and administrative expenses	(91)	(89)	(283)	(259)
Acquisition and integration related costs	(3)	(2)	(7)	(2)
Goodwill impairment	0	0	0	(99)
Restructuring charges and asset impairments	0	(1)	(2)	(176)
Gain on disposition of assets and investments	3	0	1	18
Operating income	101	93	102	12
Interest expense	(23)	(18)	(68)	(60)
Other non-operating income (loss)	(1)	(4)	(2)	1
Income (loss) before income taxes and noncontrolling interests	77	71	32	(47)
Government Solutions
Segment Reporting Information [Line Items]
Total revenues	1,555	1,013	3,950	2,948
Total gross profit	147	131	393	377
Total equity in earnings (losses) of unconsolidated affiliates	11	11	26	23
Total selling, general and administrative expenses	(44)	(45)	(142)	(116)
Restructuring charges and asset impairments				(3)
Sustainable Technology Solutions
Segment Reporting Information [Line Items]
Total revenues	288	366	890	1,353
Total gross profit	46	41	175	123
Total equity in earnings (losses) of unconsolidated affiliates	(12)	2	(201)	7
Total selling, general and administrative expenses	(16)	(20)	(51)	(63)
Restructuring charges and asset impairments				(86)
Other
Segment Reporting Information [Line Items]
Total selling, general and administrative expenses	$ (31)	$ (24)	$ (90)	(80)
Restructuring charges and asset impairments				$ (87)

Revenue (Revenue by Geographic

Revenue (Revenue by Geographic Destination) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 1,843	$ 1,379	$ 4,840	$ 4,301
United States
Disaggregation of Revenue [Line Items]
Revenues	1,239	712	3,014	2,193
Middle East
Disaggregation of Revenue [Line Items]
Revenues	122	233	496	714
Europe
Disaggregation of Revenue [Line Items]
Revenues	272	228	711	674
Australia
Disaggregation of Revenue [Line Items]
Revenues	97	81	268	247
Canada
Disaggregation of Revenue [Line Items]
Revenues	2	10	3	41
Africa
Disaggregation of Revenue [Line Items]
Revenues	46	38	128	113
Asia
Disaggregation of Revenue [Line Items]
Revenues	47	37	150	161
Other countries
Disaggregation of Revenue [Line Items]
Revenues	18	40	70	158
Government Solutions
Disaggregation of Revenue [Line Items]
Revenues	1,555	1,013	3,950	2,948
Government Solutions | United States
Disaggregation of Revenue [Line Items]
Revenues	1,135	559	2,688	1,593
Government Solutions | Middle East
Disaggregation of Revenue [Line Items]
Revenues	72	179	348	537
Government Solutions | Europe
Disaggregation of Revenue [Line Items]
Revenues	215	165	549	514
Government Solutions | Australia
Disaggregation of Revenue [Line Items]
Revenues	93	75	260	201
Government Solutions | Canada
Disaggregation of Revenue [Line Items]
Revenues	1	1	1	1
Government Solutions | Africa
Disaggregation of Revenue [Line Items]
Revenues	23	22	61	60
Government Solutions | Asia
Disaggregation of Revenue [Line Items]
Revenues	4	0	5	0
Government Solutions | Other countries
Disaggregation of Revenue [Line Items]
Revenues	12	12	38	42
Sustainable Technology Solutions
Disaggregation of Revenue [Line Items]
Revenues	288	366	890	1,353
Sustainable Technology Solutions | United States
Disaggregation of Revenue [Line Items]
Revenues	104	153	326	600
Sustainable Technology Solutions | Middle East
Disaggregation of Revenue [Line Items]
Revenues	50	54	148	177
Sustainable Technology Solutions | Europe
Disaggregation of Revenue [Line Items]
Revenues	57	63	162	160
Sustainable Technology Solutions | Australia
Disaggregation of Revenue [Line Items]
Revenues	4	6	8	46
Sustainable Technology Solutions | Canada
Disaggregation of Revenue [Line Items]
Revenues	1	9	2	40
Sustainable Technology Solutions | Africa
Disaggregation of Revenue [Line Items]
Revenues	23	16	67	53
Sustainable Technology Solutions | Asia
Disaggregation of Revenue [Line Items]
Revenues	43	37	145	161
Sustainable Technology Solutions | Other countries
Disaggregation of Revenue [Line Items]
Revenues	6	28	32	116
Science & Space | Government Solutions
Disaggregation of Revenue [Line Items]
Revenues	280	257	788	735
Defense & Intel | Government Solutions
Disaggregation of Revenue [Line Items]
Revenues	387	218	1,133	630
Readiness & Sustainment | Government Solutions
Disaggregation of Revenue [Line Items]
Revenues	632	292	1,276	847
International | Government Solutions
Disaggregation of Revenue [Line Items]
Revenues	$ 256	$ 246	$ 753	$ 736

Revenue (Revenue by Contract Ty

Revenue (Revenue by Contract Type) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total net revenue	$ 1,843	$ 1,379	$ 4,840	$ 4,301
Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total net revenue	1,063	610	2,480	1,763
Time-and-Materials
Disaggregation of Revenue [Line Items]
Total net revenue	402	407	1,217	1,372
Fixed Price
Disaggregation of Revenue [Line Items]
Total net revenue	378	362	1,143	1,166
Government Solutions
Disaggregation of Revenue [Line Items]
Total net revenue	1,555	1,013	3,950	2,948
Government Solutions | Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total net revenue	1,063	610	2,480	1,763
Government Solutions | Time-and-Materials
Disaggregation of Revenue [Line Items]
Total net revenue	228	148	666	412
Government Solutions | Fixed Price
Disaggregation of Revenue [Line Items]
Total net revenue	264	255	804	773
Sustainable Technology Solutions
Disaggregation of Revenue [Line Items]
Total net revenue	288	366	890	1,353
Sustainable Technology Solutions | Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total net revenue	0	0	0	0
Sustainable Technology Solutions | Time-and-Materials
Disaggregation of Revenue [Line Items]
Total net revenue	174	259	551	960
Sustainable Technology Solutions | Fixed Price
Disaggregation of Revenue [Line Items]
Total net revenue	$ 114	$ 107	$ 339	$ 393

Revenue (Narrative) (Details)

Revenue (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue recognized from performance obligation satisfied in previous period	$ 4	$ 14	$ 36
Contract liability, revenue recognized		$ 147	$ 294

Revenue (Remaining Performance

Revenue (Remaining Performance Obligation) (Details) $ in Billions	Sep. 30, 2021USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation	$ 11.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected to be satisfied in one year, percentage	26.00%
Revenue, remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected to be satisfied in one year, percentage	33.00%
Revenue, remaining performance obligation, expected timing of satisfaction	4 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected to be satisfied in one year, percentage	41.00%
Revenue, remaining performance obligation, expected timing of satisfaction

Revenue (Accounts Receivable, C

Revenue (Accounts Receivable, Contract Assets and Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Revenue from External Customer [Line Items]
Accounts receivable	$ 1,245	$ 899
Unbilled
Revenue from External Customer [Line Items]
Accounts receivable	791	476
Trade & other
Revenue from External Customer [Line Items]
Accounts receivable	$ 454	$ 423

Acquisitions (Harmonic Limited)

Acquisitions (Harmonic Limited) (Details) - Harmonic Limited	Jul. 01, 2021USD ($)
Business Acquisition [Line Items]
Purchase price of acquisition	$ 19,000,000
Cash consideration paid	17,000,000
Contingent consideration	2,000,000
Net working capital	3,000,000
Goodwill acquired during period	14,000,000
Tax deductible amount	0
Order or Production Backlog
Business Acquisition [Line Items]
Assets acquired	$ 2,000,000

Acquisitions (Centauri Platform

Acquisitions (Centauri Platform Holdings, LLC) (Details) - USD ($) $ in Millions	Oct. 01, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill		$ 1,772		$ 1,772		$ 1,761
Acquisition related costs		3	$ 2	7	$ 2
Centauri LLC
Business Acquisition [Line Items]
Purchase price of acquisition	$ 830
Goodwill	576
Intangible assets	$ 226
Weighted average useful life	13 years
Acquisition related costs		2		4
Revenues		148		461
Gross profit		$ 19		$ 56

Acquisitions (Pro Forma Informa

Acquisitions (Pro Forma Information) (Details) - Centauri LLC - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Business Acquisition [Line Items]
Revenue	$ 1,537	$ 4,728
Net loss attributable to KBR	$ 58	$ (83)
Diluted earnings per share (usd per share)	$ 0.40	$ (0.58)

Acquisitions (Scientific Manage

Acquisitions (Scientific Management Associates) (Details) - USD ($) $ in Millions	Mar. 06, 2020	Mar. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill			$ 1,772	$ 1,761
SMA
Business Acquisition [Line Items]
Purchase price of acquisition	$ 13
Hold-backs to be settled and other adjustments	4
Cash consideration paid	9
Goodwill	$ 12
Payment of contingent consideration liability		$ 1

Acquisitions (Frazer-Nash Consu

Acquisitions (Frazer-Nash Consultancy Limited) (Details) - Subsequent Event - Frazer-Nash Consultancy Limited $ in Millions	Oct. 20, 2021USD ($)
Business Acquisition [Line Items]
Purchase price of acquisition	$ 402
Borrowings used to pay for acquisition	294
Cash consideration paid	$ 108

Cash and Equivalents (Details)

Cash and Equivalents (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Cash and equivalents	$ 550	$ 436
Operating cash and equivalents
Cash and Cash Equivalents [Line Items]
Cash and equivalents	379	282
Short-term investments
Cash and Cash Equivalents [Line Items]
Cash and equivalents	2	3
Cash and equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities
Cash and Cash Equivalents [Line Items]
Cash and equivalents	169	151
International
Cash and Cash Equivalents [Line Items]
Cash and equivalents	424	382
International | Operating cash and equivalents
Cash and Cash Equivalents [Line Items]
Cash and equivalents	253	228
International | Short-term investments
Cash and Cash Equivalents [Line Items]
Cash and equivalents	2	3
International | Cash and equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities
Cash and Cash Equivalents [Line Items]
Cash and equivalents	169	151
Domestic
Cash and Cash Equivalents [Line Items]
Cash and equivalents	126	54
Domestic | Operating cash and equivalents
Cash and Cash Equivalents [Line Items]
Cash and equivalents	126	54
Domestic | Short-term investments
Cash and Cash Equivalents [Line Items]
Cash and equivalents	0	0
Domestic | Cash and equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities
Cash and Cash Equivalents [Line Items]
Cash and equivalents	$ 0	$ 0

Unapproved Change Orders and _3

Unapproved Change Orders and Claims Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors (Rollforward) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Unapproved Change Orders [Roll Forward]
Amounts included in project estimates-at-completion at January 1,	$ 1,048	$ 978
(Decrease) increase in project estimates	(228)	(1)
Approved change orders	(374)	(6)
Foreign currency impact	(19)	5
Amounts included in project estimates-at-completion at September 30,	427	976
Amounts recognized over time based on progress at September 30	$ 427	$ 976

Unapproved Change Orders and _4

Unapproved Change Orders and Claims Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Oct. 28, 2021
Increases in Unapproved Change Orders and Claims [Line Items]
Equity in earnings (losses) of unconsolidated affiliates	$ (1)		$ 13	$ (175)	$ 30
Commitments, estimated recovery	1,700			1,700
Gross profit	193		172	568	500
Ichthys LNG Project
Increases in Unapproved Change Orders and Claims [Line Items]
Letters of credit outstanding, amount	164			164
Ichthys LNG Project | Subsequent Event
Increases in Unapproved Change Orders and Claims [Line Items]
Letters of credit outstanding, amount						$ 82
Sustainable Technology Solutions
Increases in Unapproved Change Orders and Claims [Line Items]
Equity in earnings (losses) of unconsolidated affiliates	(12)		2	(201)	7
Gross profit	46		$ 41	175	123
Sustainable Technology Solutions | Ichthys LNG Project
Increases in Unapproved Change Orders and Claims [Line Items]
Equity in earnings (losses) of unconsolidated affiliates		$ (193)		(193)
Final warranty	10
Sustainable Technology Solutions | EPC Project
Increases in Unapproved Change Orders and Claims [Line Items]
Gross profit	$ 37
Settlement				$ 20
Sustainable Technology Solutions | Other Legacy Matters
Increases in Unapproved Change Orders and Claims [Line Items]
Settlement					$ 16
JKC Joint Venture
Increases in Unapproved Change Orders and Claims [Line Items]
Ownership percentage				30.00%

Restructuring Charges (Details)

Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				$ 78
Asset Impairments				98
Total Restructuring Charges & Asset Impairments	$ 0	$ 1	$ 2	176
Government Solutions
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				1
Asset Impairments				2
Total Restructuring Charges & Asset Impairments				3
Sustainable Technology Solutions
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				36
Asset Impairments				50
Total Restructuring Charges & Asset Impairments				86
Other
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				41
Asset Impairments				46
Total Restructuring Charges & Asset Impairments				87
Severance
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				35
Severance | Government Solutions
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				1
Severance | Sustainable Technology Solutions
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				33
Severance | Other
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				1
Lease Abandonment
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				24
Lease Abandonment | Government Solutions
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				0
Lease Abandonment | Sustainable Technology Solutions
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				3
Lease Abandonment | Other
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				21
Other
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				19
Other | Government Solutions
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				0
Other | Sustainable Technology Solutions
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				0
Other | Other
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges				$ 19

Restructuring Charges (Narrativ

Restructuring Charges (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges and asset impairments	$ 0	$ 1	$ 2	$ 176
Restructuring liability	71		71		$ 91
Other Current Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring liability	20		20
Other Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring liability	$ 51		$ 51

Restructuring Charges (Reconcil

Restructuring Charges (Reconciliation of Restructuring Liability) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Restructuring Reserve [Roll Forward]
Balance at January 1, 2021	$ 91
Lease restructuring charges related to operating lease liabilities	2
Cash payments / settlements during the period	(17)
Currency translation and other adjustments	(5)
Balance at September 30, 2021	71
Severance
Restructuring Reserve [Roll Forward]
Balance at January 1, 2021	15
Lease restructuring charges related to operating lease liabilities	0
Cash payments / settlements during the period	(8)
Currency translation and other adjustments	(2)
Balance at September 30, 2021	5
Lease Abandonment
Restructuring Reserve [Roll Forward]
Balance at January 1, 2021	52
Lease restructuring charges related to operating lease liabilities	2
Cash payments / settlements during the period	(5)
Currency translation and other adjustments	0
Balance at September 30, 2021	49
Other
Restructuring Reserve [Roll Forward]
Balance at January 1, 2021	24
Lease restructuring charges related to operating lease liabilities	0
Cash payments / settlements during the period	(4)
Currency translation and other adjustments	(3)
Balance at September 30, 2021	$ 17

Equity Method Investments and_3

Equity Method Investments and Variable Interest Entities (Schedule of Equity in Earnings of Unconsolidated Affiliates) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Equity Method Investment [Roll Forward]
Beginning balance at January 1,			$ 881
Equity in earnings (losses) of unconsolidated affiliates	$ (1)	$ 13	(175)	$ 30
Distributions of earnings of unconsolidated affiliates			(37)	(35)
Investments			13	22
Ending balance	590		590		$ 881
Sustainable Technology Solutions
Equity Method Investment [Roll Forward]
Equity in earnings (losses) of unconsolidated affiliates	(12)	$ 2	(201)	7
Impairment of equity method investments					(6)
Impairment of equity method investments					6
EBIC Ammonia Project
Equity Method Investment [Roll Forward]
Impairment of equity method investments					(13)
Sale of equity method investment	(39)
Impairment of equity method investments					13
Equity method investments	39
Cash proceeds	43
Gain on disposal	4
Payment of proportionate share of sale of equity method investment to noncontrollling interest	15
EBIC Ammonia Project | Noncontrolling Interest
Equity Method Investment [Roll Forward]
Portion of gain attributable to noncontrolling interest	1
Equity Method Investments
Equity Method Investment [Roll Forward]
Beginning balance at January 1,			881	$ 846	846
Equity in earnings (losses) of unconsolidated affiliates			(175)		30
Distributions of earnings of unconsolidated affiliates			(37)		(38)
Advances to (payments from) unconsolidated affiliates, net			(18)		(15)
Investments			13		26
Impairment of equity method investments			0		(19)
Sale of equity method investment			(39)		0
Foreign currency translation adjustments			(9)		50
Other			(26)		1
Ending balance	$ 590		590		881
Amount allocated to fund ownership venture			10		24
Impairment of equity method investments			0		19
Equity method investments			$ 39		$ 0

Equity Method Investments and_4

Equity Method Investments and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Total Assets	$ 5,832	$ 5,705
Total Liabilities	4,332	4,096
Variable Interest Entity, Not Primary Beneficiary | Affinity joint venture (U.K. MFTS project)
Schedule of Equity Method Investments [Line Items]
Total Assets	9	11
Total Liabilities	8	9
Variable Interest Entity, Not Primary Beneficiary | Aspire Defence Limited
Schedule of Equity Method Investments [Line Items]
Total Assets	61	68
Total Liabilities	5	5
Variable Interest Entity, Not Primary Beneficiary | JKC joint venture (Ichthys LNG project)
Schedule of Equity Method Investments [Line Items]
Total Assets	340	606
Total Liabilities	3	44
Variable Interest Entity, Not Primary Beneficiary | U.K. Roads project joint ventures
Schedule of Equity Method Investments [Line Items]
Total Assets	54	59
Total Liabilities	0	0
Variable Interest Entity, Not Primary Beneficiary | Middle East Petroleum Corporation (EBIC ammonia project)
Schedule of Equity Method Investments [Line Items]
Total Assets	0	31
Total Liabilities	$ 0	$ 1

Equity Method Investments and_5

Equity Method Investments and Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Transactions with Related Parties
Schedule of Equity Method Investments [Line Items]
Revenue from related parties	$ 281	$ 379

Equity Method Investments and_6

Equity Method Investments and Variable Interest Entities (Related Party Disclosures) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Accounts receivable, net of allowance for credit losses	$ 1,245	$ 899
Contract assets	227	178
Contract liabilities	289	356
Transactions with Related Parties
Schedule of Equity Method Investments [Line Items]
Accounts receivable, net of allowance for credit losses	45	83
Contract assets	2	2
Contract liabilities	$ 8	$ 53

Equity Method Investments and_7

Equity Method Investments and Variable Interest Entities (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Total Assets	$ 5,832	$ 5,705
Total Liabilities	4,332	4,096
Variable Interest Entity, Primary Beneficiary | Fasttrax Limited (Fasttrax project)
Schedule of Equity Method Investments [Line Items]
Total Assets	20	45
Total Liabilities	6	18
Variable Interest Entity, Primary Beneficiary | Aspire Defence subcontracting entities (Aspire Defence project)
Schedule of Equity Method Investments [Line Items]
Total Assets	479	448
Total Liabilities	$ 261	$ 205

Retirement Benefits (Details)

Retirement Benefits (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer			$ 35
Estimated future employer contributions in next fiscal year	$ 49		49
United States
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	$ 0	0	$ 0
Interest cost	0	0	1	1
Expected return on plan assets	0	0	(2)	(2)
Amortization of prior service cost	0	0	0	0
Recognized actuarial loss	0	0	1	1
Net periodic pension cost (benefit)	0	0	0	0
Int’l
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1	1
Interest cost	8	9	24	28
Expected return on plan assets	(21)	(15)	(64)	(44)
Amortization of prior service cost	0	0	1	1
Recognized actuarial loss	8	6	24	17
Net periodic pension cost (benefit)	$ (4)	$ 1	$ (14)	$ 3

Debt and Other Credit Facilit_3

Debt and Other Credit Facilities (Outstanding Debt Balances) (Details) $ in Millions, $ in Millions	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)	Jul. 02, 2020USD ($)	Jul. 02, 2020AUD ($)
Debt Instrument [Line Items]
Total debt	$ 1,594	$ 1,596
Less: current portion	16	12
Total long-term debt, net of current portion	1,578	1,584
Secured Debt | Term Loan A
Debt Instrument [Line Items]
Long-term debt	274	285
Unamortized debt issuance costs	(3)	(4)
Total debt				$ 275
Secured Debt | Term Loan B
Debt Instrument [Line Items]
Long-term debt	512	516
Unamortized debt issuance costs	(14)	(16)
Total debt			$ 520
Convertible Debt
Debt Instrument [Line Items]
Long-term debt	350	350
Unamortized debt issuance costs	(30)	(40)
Senior Notes
Debt Instrument [Line Items]
Long-term debt	250	250
Unamortized debt issuance costs	(5)	(5)
Senior Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 260	$ 260

Debt and Other Credit Facilit_4

Debt and Other Credit Facilities (Senior Credit Facility) (Details) $ in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)	Jun. 30, 2022	Dec. 31, 2020USD ($)	Jul. 02, 2020USD ($)	Jul. 02, 2020AUD ($)	Jun. 30, 2020
Line of Credit Facility [Line Items]
Revolving credit agreement	$ 1,594		$ 1,596
Long-term line of credit				$ 1,795
Term Loan A
Line of Credit Facility [Line Items]
Debt instrument, periodic payment, percentage of aggregate principal						0.625%
Term Loan A | Forecast
Line of Credit Facility [Line Items]
Debt instrument, periodic payment, percentage of aggregate principal		1.25%
Term Loan B | LIBOR Margin
Line of Credit Facility [Line Items]
Revolver and term loan A, interest rate	2.75%
Secured Debt | Term Loan A
Line of Credit Facility [Line Items]
Revolving credit agreement					$ 275
Debt instrument, covenant, interest coverage ratio						3
Secured Debt | Term Loan A | Maximum
Line of Credit Facility [Line Items]
Debt instrument, covenant, leverage ratio through 2021	4.25
Debt instrument, covenant, term two, leverage ratio	4
Debt instrument, covenant, leverage ratio through 2023	3.75
Secured Debt | Term Loan B
Line of Credit Facility [Line Items]
Revolving credit agreement				520
Debt instrument, periodic payment, percentage of aggregate principal						0.25%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Letters of credit outstanding, amount				$ 1,000

Debt and Other Credit Facilit_5

Debt and Other Credit Facilities (Schedule of Commitment Fees) (Details)	9 Months Ended
	Sep. 30, 2021
Greater than or equal to 3.25 to 1.00
Debt Instrument [Line Items]
Commitment Fee	0.35%
Greater than or equal to 3.25 to 1.00 | Revolver and Term Loan A | LIBOR Margin
Debt Instrument [Line Items]
Revolver and Term Loan A	2.25%
Greater than or equal to 3.25 to 1.00 | Revolver and Term Loan A | Base Rate Margin
Debt Instrument [Line Items]
Revolver and Term Loan A	1.25%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00
Debt Instrument [Line Items]
Commitment Fee	0.30%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 | Revolver and Term Loan A | LIBOR Margin
Debt Instrument [Line Items]
Revolver and Term Loan A	2.00%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 | Revolver and Term Loan A | Base Rate Margin
Debt Instrument [Line Items]
Revolver and Term Loan A	1.00%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00
Debt Instrument [Line Items]
Commitment Fee	0.25%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 | Revolver and Term Loan A | LIBOR Margin
Debt Instrument [Line Items]
Revolver and Term Loan A	1.75%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 | Revolver and Term Loan A | Base Rate Margin
Debt Instrument [Line Items]
Revolver and Term Loan A	0.75%
Less than 1.25 to 1.00
Debt Instrument [Line Items]
Commitment Fee	0.20%
Less than 1.25 to 1.00 | Revolver and Term Loan A | LIBOR Margin
Debt Instrument [Line Items]
Revolver and Term Loan A	1.50%
Less than 1.25 to 1.00 | Revolver and Term Loan A | Base Rate Margin
Debt Instrument [Line Items]
Revolver and Term Loan A	0.50%

Debt and Other Credit Facilit_6

Debt and Other Credit Facilities (Convertible Senior Notes) (Details)	Aug. 21, 2021$ / shares	Nov. 15, 2018USD ($)$ / shares	Sep. 30, 2021USD ($)$ / shares	Sep. 30, 2020USD ($)$ / shares	Sep. 30, 2021USD ($)$ / shares	Sep. 30, 2020USD ($)$ / shares	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Cash dividends declared per share (usd per share) | $ / shares			$ 0.11	$ 0.10	$ 0.33	$ 0.30
Nonrecourse project debt		$ 62,000,000	$ 2,000,000		$ 2,000,000		$ 2,000,000
Proceeds from sale of warrants		$ 22,000,000
Exercise price (usd per share) | $ / shares		$ 40.02	$ 39,790,000		$ 39,790,000
Convertible Debt | Notes Due 2023
Debt Instrument [Line Items]
Aggregate principal amount		$ 350,000,000
Interest rate, stated percentage		2.50%
Conversion price (usd per share) | $ / shares		$ 25.51
Conversion rate	0.0394261	0.0391961
Cash dividends declared per share (usd per share) | $ / shares	$ 0.11
Convertible stock price (usd per share) | $ / shares	$ 25.36
If-converted value in excess of principal					$ 192,000,000
Carrying value of the equity component			$ 57,000,000		57,000,000		$ 57,000,000
Interest cost relating to contractual interest coupon			2,000,000	$ 3,000,000	6,000,000	$ 7,000,000
Interest cost relating to amortization of discount			$ 3,000,000	$ 3,000,000	$ 10,000,000	$ 9,000,000
Effective percentage			6.50%		6.50%		6.50%

Debt and Other Credit Facilit_7

Debt and Other Credit Facilities (Senior Notes) (Details) - Senior Notes - Notes Due 2028 - USD ($)	Sep. 30, 2020	Sep. 30, 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	4.75%
Net proceeds from offering fee	$ 245,000,000
Interest rate, stated redeem percentage		35.00%
Prior to September 30, 2023
Debt Instrument [Line Items]
Redemption price, percentage		100.00%
On or after September 30, 2023
Debt Instrument [Line Items]
Redemption price, percentage		104.75%
Change of control
Debt Instrument [Line Items]
Redemption price, percentage		101.00%
Centauri LLC
Debt Instrument [Line Items]
Aggregate principal amount	$ 250,000,000

Debt and Other Credit Facilit_8

Debt and Other Credit Facilities (Letters of Credit, Surety Bonds and Guarantees) (Details) - USD ($)	Sep. 30, 2021	Jul. 02, 2020
Debt Instrument [Line Items]
Long-term line of credit		$ 1,795,000,000
Letters Of Credit Surety Bonds And Bank Guarantees
Debt Instrument [Line Items]
Letters of credit outstanding relate to joint venture operations	$ 168,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding, amount		$ 1,000,000,000
Performance Letter of Credit Fee | Letter of Credit
Debt Instrument [Line Items]
Long-term line of credit	820,000,000
Performance Letter of Credit Fee | Letter of Credit | Committed Line Of Credit
Debt Instrument [Line Items]
Aggregate principal amount	1,000,000,000
Performance Letter of Credit Fee | Letter of Credit | Uncommitted Line Of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	415,000,000
Letters of credit outstanding, amount	213,000,000
Performance Letter of Credit Fee | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term line of credit	260,000,000
Letters of credit outstanding, amount	$ 122,000,000

Debt and Other Credit Facilit_9

Debt and Other Credit Facilities (Nonrecourse Project Debt) (Details) £ in Millions	9 Months Ended
	Sep. 30, 2021GBP (£)transporter
Minimum
Debt Instrument [Line Items]
Subordinated notes payable, interest rate	11.25%
Maximum
Debt Instrument [Line Items]
Subordinated notes payable, interest rate	16.00%
Class A 3.5% Index Linked Bond
Debt Instrument [Line Items]
Guaranteed secured bonds, percentage	3.50%
Class A 3.5% Index Linked Bond | United Kingdom, Pounds
Debt Instrument [Line Items]
Secured bonds	£ 56
Class B 5.9% Fixed Rate Bonds
Debt Instrument [Line Items]
Guaranteed secured bonds, percentage	5.90%
Class B 5.9% Fixed Rate Bonds | United Kingdom, Pounds
Debt Instrument [Line Items]
Secured bonds	£ 20.7
Nonrecourse Project Finance Debt
Debt Instrument [Line Items]
Number of heavy equipment transporters | transporter	91
Number of heavy equipment transporters term period (years)	22 years
Fasttrax Limited | Nonrecourse Project Finance Debt
Debt Instrument [Line Items]
Ownership percentage	50.00%

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Examination [Line Items]
Effective tax rate on income from operations	25.00%		27.00%	234.00%	(51.00%)
Effective tax rate excluding impact of equity adjustment	19.00%			23.00%
Effective tax rate excluding impact of impairment and restructuring charges			27.00%		27.00%
Effective income tax rate, estimated				23.00%
Deferred tax assets, valuation allowance	$ 210			$ 210		$ 220
Income from foreign sources				662
Income from domestic sources				614
Liabilities for uncertain tax positions	$ 93			$ 93		$ 96
UNITED KINGDOM | Minimum
Income Tax Examination [Line Items]
Corporate tax rate		19.00%
UNITED KINGDOM | Maximum
Income Tax Examination [Line Items]
Corporate tax rate		25.00%

Claims and Accounts Receivable

Claims and Accounts Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Claims and accounts receivable	$ 30	$ 30
Government Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Government contract receivable	1	1
Disputed costs	$ 29	$ 29

U.S. Government Matters (Detail

U.S. Government Matters (Details)	1 Months Ended
	Jan. 31, 2014subcontractordefendant	Apr. 30, 2008USD ($)	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)	Mar. 31, 2011USD ($)
Reserve For Potentially Disallowable Costs Incurred Under Government Contracts
United States Government Contract Work [Line Items]
Accrued reserve for unallowable costs			$ 33,000,000	$ 33,000,000
First Kuwaiti Trading Company Arbitration
United States Government Contract Work [Line Items]
Damages awarded, value		$ 17,000,000
Amount owed to subcontractor		$ 32,000,000
Howard qui tam
United States Government Contract Work [Line Items]
Estimate of possible loss					$ 628,000,000
Amount accrued			$ 0
DOJFCA
United States Government Contract Work [Line Items]
Number of subcontractors | subcontractor	2
Number of defendants | defendant	3

Other Commitments and Conting_2

Other Commitments and Contingencies (Details) $ in Millions, $ in Millions	Oct. 09, 2020USD ($)	May 28, 2020AUD ($)	Mar. 31, 2019USD ($)	May 31, 2018USD ($)lawsuit	Sep. 30, 2021AUD ($)
Chadian Employee Class Action
Loss Contingencies [Line Items]
Number of class action cases | lawsuit				2
Damages awarded, value	$ 19		$ 34	$ 25
Claims in unpaid bonuses				$ 122
Chadian Employee Class Action | Provisional Award
Loss Contingencies [Line Items]
Damages awarded, value			$ 2
North West Rail Link Project
Loss Contingencies [Line Items]
Claims in unpaid bonuses		$ 301			$ 300
North West Rail Link Project | Unincorporated Joint Venture
Loss Contingencies [Line Items]
Ownership percentage					33.00%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Changes by Component) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,501	$ 1,642	$ 1,609	$ 1,853
Other comprehensive income adjustments before reclassifications			3	(35)
Amounts reclassified from AOCL			31	8
Other comprehensive income (loss), net of tax	(4)	29	34	(27)
Ending balance	1,500	1,713	1,500	1,713
Accumulated foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(291)	(315)
Other comprehensive income adjustments before reclassifications			(6)	(15)
Amounts reclassified from AOCL			2	(12)
Other comprehensive income (loss), net of tax			(4)	(27)
Ending balance	(295)	(342)	(295)	(342)
Accumulated pension liability adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(764)	(654)
Other comprehensive income adjustments before reclassifications			0	0
Amounts reclassified from AOCL			20	15
Other comprehensive income (loss), net of tax			20	15
Ending balance	(744)	(639)	(744)	(639)
Changes in fair value of derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(28)	(18)
Other comprehensive income adjustments before reclassifications			9	(20)
Amounts reclassified from AOCL			9	5
Other comprehensive income (loss), net of tax			18	(15)
Ending balance	(10)	(33)	(10)	(33)
AOCL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,045)	(1,043)	(1,083)	(987)
Other comprehensive income (loss), net of tax	(4)	29	34	(27)
Ending balance	$ (1,049)	$ (1,014)	$ (1,049)	$ (1,014)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss (Reclassification out of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit	$ (19)	$ (19)	$ (75)	$ (24)
Foreign currency hedge and interest rate swap settlements	(1)	(4)	(2)	1
Net income (loss)	$ 58	$ 52	(43)	(71)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated foreign currency adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of foreign currency adjustments			(2)	12
Tax benefit			0	0
Net income (loss)			(2)	12
Reclassification out of Accumulated Other Comprehensive Income | Accumulated pension liability adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit			5	3
Amortization of actuarial loss			(25)	(18)
Net income (loss)			(20)	(15)
Reclassification out of Accumulated Other Comprehensive Income | Changes in fair value for derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit			3	1
Foreign currency hedge and interest rate swap settlements			(12)	(6)
Net income (loss)			$ (9)	$ (5)

Share Repurchases (Narrative) (

Share Repurchases (Narrative) (Details) - USD ($)	Sep. 30, 2021	Feb. 19, 2020	Dec. 31, 2019	Feb. 25, 2014
Equity [Abstract]
Stock repurchase program, authorized amount		$ 350,000,000		$ 350,000,000
Remaining authorized repurchase amount	$ 250,000,000		$ 160,000,000
Additional amount authorized for repurchase program		$ 190,000,000

Share Repurchases (Details)

Share Repurchases (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Feb. 19, 2020	Feb. 25, 2014
Equity, Class of Treasury Stock [Line Items]
Value of common stock repurchases	$ 26,000,000		$ 58,000,000	$ 4,000,000
Number of shares (in shares)	3,448	4,914	144,697	165,046
Average price per share (usd per share)	$ 38.47	$ 23.06	$ 32.06	$ 25.66
Value of common stock repurchases	$ 0	$ 0	$ 4,000,000	$ 4,000,000
Number of shares (in shares)	650,621	4,914	1,473,154	165,046
Average price per share (usd per share)	$ 38.61	$ 23.06	$ 39.02	$ 25.66
Value of common stock repurchases	$ 25,000,000	$ 0	$ 57,000,000	$ 4,000,000
Stock repurchase program, authorized amount					$ 350,000,000	$ 350,000,000
Share Repurchase Program Twenty Fourteen
Equity, Class of Treasury Stock [Line Items]
Number of Shares (in shares)	647,173	0	1,328,457	0
Average Price per Share (usd per share)	$ 38.61	$ 0	$ 39.78	$ 0
Value of common stock repurchases	$ 25,000,000	$ 0	$ 53,000,000	$ 0

Income (loss) per Share (Schedu

Income (loss) per Share (Schedule Of Basic And Diluted Weighted Average Common Shares Outstanding) (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding (in shares)	140	142	141	142
Stock options, restricted shares, and convertible debt (in shares)	5	0	0	0
Diluted weighted average common shares outstanding (in shares)	145	142	141	142

Income (loss) per Share (Narrat

Income (loss) per Share (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Undistributed earnings (loss) allocated to participating securities, diluted	$ 300,000	$ 300,000	$ 0	$ 0
Antidilutive weighted average shares (in shares)	0	1,200,000	100,000	1,200,000

Fair Value of Financial Instr_3

Fair Value of Financial Instruments and Risk Management (Carrying Value and Fair Value) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Carrying Value | Secured Debt | Term Loan A
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	$ 274	$ 285
Carrying Value | Secured Debt | Term Loan B
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	512	516
Carrying Value | Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	350	350
Carrying Value | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	250	250
Carrying Value | Senior Credit Facility | Revolving Credit Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	260	260
Carrying Value | Nonrecourse project debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	2	7
Fair Value | Secured Debt | Term Loan A
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	274	285
Fair Value | Secured Debt | Term Loan B
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	513	517
Fair Value | Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	564	480
Fair Value | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	256	262
Fair Value | Senior Credit Facility | Revolving Credit Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	260	260
Fair Value | Nonrecourse project debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	$ 2	$ 7

Fair Value of Financial Instr_4

Fair Value of Financial Instruments and Risk Management (Foreign Currency Risk) (Details)	9 Months Ended
	Sep. 30, 2021USD ($)
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Maximum length of time hedged in balance sheet hedge	15 days
Balance Sheet Hedge
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Derivative, notional amount	$ 76,000,000

Fair Value of Financial Instr_5

Fair Value of Financial Instruments and Risk Management (Summary of Changes in Fair Value of Balance Sheet Hedges) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Balance Sheet Hedges - Fair Value	$ 1	$ (2)	$ 0	$ (2)
Balance Sheet Position - Remeasurement	(1)	(2)	(6)	4
Net	$ 0	$ (4)	$ (6)	$ 2

Fair Value of Financial Instr_6

Fair Value of Financial Instruments and Risk Management (Interest Rate Risk) (Details) - Interest Rate Swap - USD ($)	3 Months Ended	9 Months Ended
	Mar. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Mar. 31, 2020	Oct. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative, notional amount				$ 400,000,000	$ 500,000,000
Interest rate derivative assets (liabilities), net		$ (11,000,000)	$ (33,000,000)
Unrealized loss on derivatives	$ 33,000,000	11,000,000
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Interest rate derivative assets (liabilities), net		(15,000,000)	(15,000,000)
Other Liabilities
Derivatives, Fair Value [Line Items]
Interest rate derivative assets (liabilities), net		0	$ (18,000,000)
Other Assets
Derivatives, Fair Value [Line Items]
Interest rate derivative assets (liabilities), net		$ 4,000,000
LIBOR
Derivatives, Fair Value [Line Items]
Fixed interest rate				0.965%	3.055%

Fair Value of Financial Instr_7

Fair Value of Financial Instruments and Risk Management (Credit Losses) (Details) - Sustainable Technology Solutions $ in Millions	Sep. 30, 2021USD ($)
Contract with Customer, Asset, Past Due [Line Items]
Accounts receivable and contract assets, net of allowances	$ 321
Allowance for accounts receivable and contract assets	$ 13
Accounts receivable, percent outstanding less than 90 days	81.00%

Fair Value of Financial Instr_8

Fair Value of Financial Instruments and Risk Management (Sale of Receivables) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Fair Value Disclosures [Abstract]
Sale of receivables	$ 1,609
Receivables sold	$ 1,583

Fair Value of Financial Instr_9

Fair Value of Financial Instruments and Risk Management (Sale of Receivables - Third-party Financial Institutions) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Transfer of Financial Assets Accounted for as Sales [Roll Forward]
Beginning balance	$ 112	$ 0
Sale of receivables	1,609	61
Settlement of receivables	(1,600)	(37)
Cash collected, not yet remitted	(8)	0
Outstanding balances sold to financial institutions	$ 113	$ 24

Uncategorized Items - kbr-20210

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]