Huntington Ingalls Industries (HII) 10-Q 6 May 21 2021 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-34910
Entity Registrant Name	HUNTINGTON INGALLS INDUSTRIES, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	90-0607005
Entity Address, Address Line One	4101 Washington Avenue
Entity Address, City or Town	Newport News
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	23607
City Area Code	757
Local Phone Number	380-2000
Title of 12(b) Security	Common Stock
Trading Symbol	HII
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		40,232,340
Amendment Flag	false
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2021
Entity Central Index Key	0001501585
Current Fiscal Year End Date	--12-31

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Sales and service revenues
Sales and service revenues	$ 2,278	$ 2,263
Cost of sales and service revenues
Income (loss) from operating investments, net	8	6
Other income and gains	3
General and administrative expenses	206	214
Operating income (loss)	147	215
Other income (expense)
Interest expense	(21)	(16)
Non-operating retirement benefit (expense)	46	30
Other, net	1	(13)
Earnings (loss) before income taxes	173	216
Federal and foreign income taxes	25	44
Net earnings (loss)	$ 148	$ 172
Basic earnings (loss) per share (in dollars per share)	$ 3.68	$ 4.23
Weighted-average common shares outstanding (in shares)	40.2	40.7
Diluted earnings (loss) per share	$ 3.68	$ 4.23
Weighted-average diluted shares outstanding (in shares)	40.2	40.7
Dividends declared per share	$ 1.14	$ 1.03
Other comprehensive income (loss)
Change in unamortized benefit plan costs	$ 29	$ 23
Other	2	(2)
Tax benefit (expense) for items of other comprehensive income	(7)	(6)
Other comprehensive income (loss), net of tax	24	15
Comprehensive income (loss)	172	187
Product [Member]
Sales and service revenues
Sales and service revenues	1,721	1,624
Cost of sales and service revenues
Cost of sales and service revenues	1,454	1,290
Service [Member]
Sales and service revenues
Sales and service revenues	557	639
Cost of sales and service revenues
Cost of sales and service revenues	$ 482	$ 550

Condensed Consolidated Statem_2

Condensed Consolidated Statements Of Financial Position (Unaudited) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 407	$ 512
Accounts receivable, net	407	397
Contract assets	1,288	1,049
Inventoried costs, net	142	137
Income taxes receivable	133	171
Assets held for sale		133
Prepaid expenses and other current assets	66	45
Total current assets	2,443	2,444
Property, plant, and equipment, net	2,988	2,978
Operating lease assets	195	192
Goodwill	1,604	1,617
Other intangible assets, net	512	512
Deferred tax assets	95	133
Miscellaneous other assets	377	281
Total assets	8,214	8,157
Current Liabilities
Trade accounts payable	397	460
Accrued employees' compensation	302	293
Current portion of postretirement plan liabilities	133	133
Current portion of workers' compensation liabilities	227	225
Contract liabilities	700	585
Liabilities held for sale		68
Other current liabilities	531	462
Total current liabilities	2,290	2,226
Long-term debt	1,688	1,686
Pension plan liabilities	869	960
Other postretirement plan liabilities	397	401
Workers' compensation liabilities	515	511
Long-term operating lease liabilities	159	157
Other long-term liabilities	317	315
Total liabilities	6,235	6,256
Commitments and Contingencies (Note 14)
Stockholders' Equity
Common stock	1	1
Additional paid-in capital	1,974	1,972
Retained earnings (deficit)	3,635	3,533
Treasury stock	(2,108)	(2,058)
Accumulated other comprehensive income (loss)	(1,523)	(1,547)
Total stockholders' equity	1,979	1,901
Total liabilities and stockholders' equity	$ 8,214	$ 8,157

Condensed Consolidated Statem_3

Condensed Consolidated Statements Of Financial Position (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ 2	$ 2
Accumulated depreciation	2,055	2,024
Accumulated amortization	$ 668	$ 655
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	53,400,000	53,300,000
Common stock, shares outstanding (in shares)	40,300,000	40,500,000

Condensed Consolidated Statem_4

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities
Net earnings (loss)	$ 148	$ 172
Adjustments to reconcile to net cash provided by (used in) operating activities
Depreciation	52	47
Amortization of purchased intangibles	13	11
Amortization of debt issuance costs	2	1
Stock-based compensation	9	7
Deferred income taxes	31	18
Gain on disposition of business	(3)
Loss (gain) on investments in marketable securities	(4)	16
Change in
Accounts Receivable	(10)	(93)
Contract assets	(239)	(140)
Inventoried costs	(5)	(6)
Prepaid expenses and other assets	(6)	(1)
Accounts payable and accruals	116	46
Retiree benefits	(65)	(13)
Other non-cash transactions, net	4	3
Net cash provided by (used in) operating activities	43	68
Investing Activities
Capital expenditure additions	(60)	(71)
Grant proceeds for capital expenditures	1	5
Acquisitions of businesses, net of cash received		(378)
Investment in affiliates	(12)
Proceeds from disposition of business	25
Net cash provided by (used in) investing activities	(46)	(444)
Financing Activities
Proceeds from revolving credit facility borrowings		385
Repayment of revolving credit facility borrowings		(5)
Net borrowings on commercial paper		88
Dividends paid	(46)	(42)
Repurchases of common stock	(49)	(84)
Employee taxes on certain share-based payment arrangements	(7)	(13)
Net cash provided by (used in) financing activities	(102)	329
Change in cash and cash equivalents	(105)	(47)
Cash and cash equivalents, beginning of period	512	75
Cash and cash equivalents, end of period	407	28
Supplemental Cash Flow Disclosure
Cash paid for income taxes (net of refunds)	(42)	2
Cash paid for interest	1	1
Non-Cash Investing and Financing Activities
Capital expenditures accrued in accounts payable	12	$ 10
Accrued repurchases of common stock	$ 1

Condensed Consolidated Statem_5

Condensed Consolidated Statements Of Changes In Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Deficit)	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2019	$ 1,588	$ 1	$ 1,961	$ 3,009	$ (1,974)	$ (1,409)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	172			172
Dividends declared	(42)			(42)
Stock compensation	(6)		(6)
Other comprehensive income (loss), net of tax	15					15
Treasury stock activity	(84)				(84)
Balance at Mar. 31, 2020	1,643	1	1,955	3,139	(2,058)	(1,394)
Balance at Dec. 31, 2020	1,901	1	1,972	3,533	(2,058)	(1,547)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	148			148
Dividends declared	(46)			(46)
Stock compensation	2		2
Other comprehensive income (loss), net of tax	24					24
Treasury stock activity	(50)				(50)
Balance at Mar. 31, 2021	$ 1,979	$ 1	$ 1,974	$ 3,635	$ (2,108)	$ (1,523)

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared per share	$ 1.14	$ 1.03

Description of Business

Description of Business	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	DESCRIPTION OF BUSINESS Huntington Ingalls Industries, Inc. ("HII" or the "Company") is one of America’s largest military shipbuilding companies and a provider of professional services to partners in government and industry. HII is organized into three reportable segments: Ingalls Shipbuilding ("Ingalls"), Newport News Shipbuilding ("Newport News"), and Technical Solutions. For more than a century, the Company's Ingalls segment in Mississippi and Newport News segment in Virginia have built more ships in more ship classes than any other U.S. naval shipbuilder. The Technical Solutions segment provides a range of services to government and commercial customers. HII conducts most of its business with the U.S. Government, primarily the Department of Defense ("DoD"). As prime contractor, principal subcontractor, team member, or partner, the Company participates in many high-priority U.S. defense programs. Through its Ingalls segment, HII is a builder of amphibious assault and expeditionary warfare ships for the U.S. Navy, the sole builder of National Security Cutters for the U.S. Coast Guard, and one of only two companies that builds the Navy's current fleet of Arleigh Burke class (DDG 51) destroyers. Through its Newport News segment, HII is the nation's sole designer, builder, and refueler of nuclear-powered aircraft carriers, and one of only two companies currently designing and building nuclear-powered submarines for the U.S. Navy. The Technical Solutions segment provides a wide range of professional services and products, including defense and federal solutions ("DFS"), nuclear and environmental services, and unmanned systems.

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	BASIS OF PRESENTATION Principles of Consolidation - The unaudited condensed consolidated financial statements of HII and its subsidiaries have been prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP") and the instructions to Form 10-Q promulgated by the Securities and Exchange Commission ("SEC"). All intercompany transactions and balances are eliminated in consolidation. For classification of current assets and liabilities related to its long-term production contracts, the Company uses the duration of these contracts as its operating cycle, which is generally longer than one year. These unaudited condensed consolidated financial statements include all adjustments of a normal recurring nature considered necessary by management for a fair presentation of the unaudited condensed consolidated financial position, results of operations, and cash flows and should be read in conjunction with the Company's audited consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2020. The quarterly information is labeled using a calendar convention; that is, first quarter is consistently labeled as ending on March 31, second quarter as ending on June 30, and third quarter as ending on September 30. It is management's long-standing practice to establish interim closing dates using a "fiscal" calendar, which requires the businesses to close their books on a Friday near these quarter-end dates in order to normalize the potentially disruptive effects of quarterly closings on business processes. The effects of this practice only exist for interim periods within a reporting year. Accounting Estimates - The preparation of the Company's unaudited condensed consolidated financial statements requires management to make estimates and judgments that affect the reported amounts of assets and liabilities and the disclosure of contingencies at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Estimates have been prepared on the basis of the most current and best available information, and actual results could differ materially from those estimates. Additionally, the Company has incorporated realized and estimated future effects of the global outbreak of coronavirus disease 2019 (“COVID-19”), including, among other things, orders of civil authorities associated with COVID-19 and steps taken to mitigate the effects of COVID-19 (collectively, “COVID-19 Events”), with respect to contract costs and revenue recognition, effective income tax rates, and the fair values of the Company’s long-lived assets, financial instruments, intangible assets, and goodwill recorded at our reporting units. While costs related to COVID-19 Events are allowable under U.S. Government contracts, the Company's estimates of the effects of COVID-19 Events reflect uncertainty regarding the Company's ability to recover the full costs related to COVID-19 Events under government relief actions such as the Coronavirus Aid, Relief, and Economic Security Act (the "CARES Act") and U.S. Department of Defense ("DoD") guidance. Government Grants - The Company recognizes incentive grants, inclusive of transfers of depreciable assets, from federal, state, and local governments at fair value upon compliance with the conditions of their receipt and reasonable assurance that the grants will be received or the depreciable assets will be transferred. Grants in recognition of specific expenses are recognized in the same period as an offset to those related expenses. Grants related to depreciable assets are recognized over the periods and in the proportions in which depreciation expense on those assets is recognized. For the three months ended March 31, 2021, the Company recognized cash grant benefits of approximately $1 million in other long-term liabilities in the unaudited condensed consolidated statements of financial position. For the three months ended March 31, 2020, the Company recognized cash grant benefits of approximately $5 million in other long-term liabilities in the unaudited condensed consolidated statements of financial position. Fair Value of Financial Instruments - Except for the Company's long-term debt, the carrying amounts of the Company's financial instruments recorded at historical cost approximate fair value due to the short-term nature of the instruments and low credit risk associated with the respective counterparties. The Company maintains multiple grantor trusts to fund certain non-qualified pension plans. These trusts were valued at $191 million and $182 million as of March 31, 2021, and December 31, 2020, respectively, and are presented within miscellaneous other assets within the unaudited condensed consolidated statements of financial position. These trusts consist primarily of investments in marketable securities, which are held at fair value within Level 1 of the fair value hierarchy. Loan Receivable - The Company holds a loan receivable in connection with a seller financed transaction involving its previously owned Avondale Shipyard facility. The receivable is carried at amortized cost of $34 million, net of $15 million of loan discount as of each of March 31, 2021, and December 31, 2020, which approximates fair value and is recorded in miscellaneous other assets on the unaudited condensed consolidated statements of financial position. Interest income is recognized on an accrual basis using the effective yield method. The discount is accreted into income using the effective yield method over the estimated life of the loan receivable. Other Current Liabilities - Other current liabilities were $531 million as of March 31, 2021, and $462 million as of December 31, 2020. Payroll taxes payable, which is a component of other current liabilities, was $127 million as of March 31, 2021, and $125 million as of December 31, 2020. No other component of other current liabilities was more than 5% of total current liabilities.

Accounting Standards Updates

Accounting Standards Updates	3 Months Ended
	Mar. 31, 2021
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Standards Updates	ACCOUNTING STANDARDS UPDATESIn December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which amends and simplifies the requirements for income taxes. The ASU is effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years, with early adoption permitted. The adoption did not result in a material impact to the Company's financial results or disclosures.Accounting pronouncements issued but not effective until after December 31, 2021, are not expected to have a material impact on the Company's consolidated financial position, results of operations, or cash flows.

Acquisitions and Divestitures

Acquisitions and Divestitures	3 Months Ended
	Mar. 31, 2021
Acquisitions and Divestitures [Abstract]
Acquisitions and Divestitures	ACQUISITIONS AND DIVESTITURES Acquisitions In December 2020, the Company acquired the autonomy business of Spatial Integrated Systems, Inc. ("SIS"), a leading provider of autonomous technology, for approximately $40 million in cash. The acquisition further expanded the Company's unmanned systems capabilities. In connection with this acquisition, the Company preliminarily recorded $40 million of goodwill, which included the value of SIS's workforce, all of which was allocated to the Company's Technical Solutions segment. For the three months ended March 31, 2021, the Company recorded a decrease in goodwill of $13 million, due to a reallocation to intangible assets related to technology and existing contract backlog. The Company has not completed the purchase price allocation, because the fair value calculations for certain assets and liabilities have not been finalized. See Note 10: Goodwill and Other Intangible Assets. The assets, liabilities, and results of operations of SIS are not material to the Company’s consolidated financial position, results of operations, or cash flows. In March 2020, the Company acquired Hydroid, Inc. ("Hydroid"), a leading provider of advanced marine robotics to the defense and maritime markets, for approximately $377 million in cash, net of $2 million of acquired cash. The acquisition expanded the Company's capabilities in the strategically important and rapidly growing autonomous and unmanned maritime systems market. In connection with this acquisition, the Company recorded $239 million of goodwill, which included the value of Hydroid's workforce, and $76 million of intangible assets related to technology and existing contract backlog. See Note 10: Goodwill and Other Intangible Assets. The assets, liabilities, and results of operations of Hydroid are not material to the Company’s consolidated financial position, results of operations, or cash flows. The Company funded each of these acquisitions using cash on hand, issuances of commercial paper, or borrowings on its revolving credit facility. The acquisition costs incurred in connection with these acquisitions were not material. The operating results of these businesses have been included in the Company’s consolidated results as of the respective closing dates of the acquisitions. In allocating the purchase prices of these businesses, the Company considered the estimated fair value of net tangible and intangible assets acquired, with any excess purchase price recorded as goodwill. The total amount of goodwill resulting from these acquisitions is expected to be amortizable for tax purposes. These acquisitions are not material either individually or in the aggregate, and pro forma revenues and results of operations have therefore not been provided. Divestitures On February 1, 2021, the Company divested its San Diego Shipyard (“SDSY”) business in exchange for a non-controlling interest in Titan Acquisition Holdings, L.P. ("Titan"). Titan is a leading provider of ship repair and specialty fabrication services to government and commercial customers. The divestiture was completed as part of the Company’s operating strategy. The Company recognized its interest in Titan at fair value, which approximates $83 million. No gain or loss was recognized in the transaction. The assets and liabilities divested were previously reported in assets and liabilities held for sale. For the three months ended March 31, 2021, the Company transferred $12 million to Titan as part of the exchange. On February 1, 2021, the Company completed the sale of its oil and gas business. The divestiture was completed as part of the Company’s plan to exit this part of the oil and gas industry and focus on its core services and customers. In connection with the sale, the Company received $25 million net cash and recorded a net pre-tax gain of $3 million in other income and gains within operating income in the unaudited condensed consolidated statements of operations. The assets and liabilities divested were previously reported in assets and liabilities held for sale.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2021
Stockholders' Equity Note [Abstract]
Stockholders' Equity [Text Block]	STOCKHOLDERS' EQUITY Treasury Stock - In November 2019, the Company's board of directors authorized an increase in the Company's stock repurchase program from $2.2 billion to $3.2 billion and an extension of the term of the program to October 31, 2024. Repurchases are made from time to time at management's discretion in accordance with applicable federal securities laws. For the three months ended March 31, 2021, the Company repurchased 291,581 shares at an aggregate cost of $50 million, of which approximately $1 million was not yet settled for cash as of March 31, 2021. For the three months ended March 31, 2020, the Company repurchased 390,904 shares at an aggregate cost of $84 million. The cost of purchased shares is recorded as treasury stock in the unaudited condensed consolidated statements of financial position. Dividends - The Company declared cash dividends per share of $1.14 and $1.03 for the three months ended March 31, 2021 and 2020, respectively. The Company paid cash dividends totaling $46 million and $42 million for the three months ended March 31, 2021 and 2020, respectively. Accumulated Other Comprehensive Loss - Other comprehensive income (loss) refers to gains and losses recorded as an element of stockholders' equity but excluded from net earnings. The accumulated other comprehensive loss as of March 31, 2021, was comprised of unamortized benefit plan costs of $1,524 million and other comprehensive income items of $1 million. The accumulated other comprehensive loss as of December 31, 2020, was comprised of unamortized benefit plan costs of $1,546 million and other comprehensive loss items of $1 million. The changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2021 and 2020, were as follows: ($ in millions) Benefit Plans Other Total Balance as of December 31, 2019 $ (1,407) $ (2) $ (1,409) Other comprehensive loss before reclassifications — (2) (2) Amounts reclassified from accumulated other comprehensive loss Amortization of prior service credit 1 (2) — (2) Amortization of net actuarial loss 1 25 — 25 Tax expense for items of other comprehensive income (6) — (6) Net current period other comprehensive income (loss) 17 (2) 15 Balance as of March 31, 2020 $ (1,390) $ (4) $ (1,394) Balance as of December 31, 2020 $ (1,546) $ (1) $ (1,547) Other comprehensive income before reclassifications — 2 2 Amounts reclassified from accumulated other comprehensive loss Amortization of prior service cost 1 3 — 3 Amortization of net actuarial loss 1 26 — 26 Tax expense for items of other comprehensive income (7) — (7) Net current period other comprehensive income 22 2 24 Balance as of March 31, 2021 $ (1,524) $ 1 $ (1,523)

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE Basic and diluted earnings per common share were calculated as follows: Three Months Ended (in millions, except per share amounts) 2021 2020 Net earnings $ 148 $ 172 Weighted-average common shares outstanding 40.2 40.7 Net dilutive effect of stock awards — — Dilutive weighted-average common shares outstanding 40.2 40.7 Earnings per share - basic $ 3.68 $ 4.23 Earnings per share - diluted $ 3.68 $ 4.23 Under the treasury stock method, the Company has excluded from the diluted share amounts presented above the effects of 0.4 million and 0.3 million Restricted Performance Stock Rights ("RPSRs") for the three months ended March 31, 2021 and 2020, respectively.

Revenue

Revenue	3 Months Ended
	Mar. 31, 2021
Disaggregation of Revenue [Abstract]
Revenue from Contract with Customer	REVENUE The following is a description of principal activities from which the Company generates its revenues. For more detailed information regarding reportable segments, see Note 8: Segment Information. U.S. Government Contracts The Ingalls and Newport News segments generate revenue primarily from performance under multi-year contracts with the U.S. Government, generally the U.S. Navy and U.S. Coast Guard, or prime contractors to contracts with the U.S. Government, relating to the advance planning, design, construction, repair, maintenance, refueling, overhaul, or inactivation of nuclear-powered ships and non-nuclear ships. The period over which the Company performs may extend past five years. The Technical Solutions segment also generates the majority of its revenue from contracts with the U.S. Government, including U.S. Government agencies. The Company generally invoices and receives related payments based upon performance progress no less frequently than monthly. Shipbuilding - For most of the Company's shipbuilding contracts, the customer contracts with the Company to provide a comprehensive service of designing, procuring long-lead-time materials, manufacturing, and integrating complex equipment and technologies into a single ship or project, often resulting in a single performance obligation. Contract modifications to account for changes in specifications and requirements are recognized when approved by the customer. In the majority of circumstances, modifications do not result in additional performance obligations that are distinct from the existing performance obligations in the contract and the effects of the modifications are recognized as an adjustment to revenue on a cumulative catch-up basis. Alternatively, in instances where the performance obligations in the modifications are deemed distinct, contract modifications are accounted for prospectively. The Company considers incentive and award fees to be variable consideration and includes in the transaction price at inception the consideration to which the Company expects to be entitled under the terms and conditions of the contract, generally estimated using a most likely amount approach. Transaction price is limited to the extent of funding allotted by the customer and available for performance, and estimated revenues represent those amounts for which the Company believes a significant reversal of revenue is not probable. The Company recognizes revenues related to shipbuilding contracts as it satisfies the related performance obligations over time using a cost-to-cost input method to measure performance progress, which best reflects the transfer of control to the customer. Services - The Technical Solutions segment generates revenue primarily under U.S. Government contracts from the provision of DFS services. Contracts generally are structured using either an Indefinite Delivery/Indefinite Quantity ("IDIQ") vehicle, under which orders are issued, or a standalone contract. Contracts may be fixed-price or cost-type, include variable consideration such as incentives and awards, and structured as task orders under an IDIQ contract vehicle or requirements contract vehicle. In either case, the Company generally performs services over a shorter duration and may continue to perform upon exercise of related period of performance options that are also shorter in duration. The Company’s performance obligations vary in nature and may be stand-ready, in which case the Company responds to the customer’s needs on the basis of its demand, a recurring service, typically recurring maintenance services, or a single performance obligation that does not comprise a series of distinct services. In determining transaction price, the Company considers incentives and other contingencies to be variable consideration and includes in the initial transaction price the consideration to which the Company expects to be entitled under the terms and conditions of the contract, generally estimated using a most likely amount approach. Transaction price is limited to the extent of funding allotted by the customer and available for performance, and estimated revenues represent those amounts for which the Company believes a significant reversal of revenue is not probable. Where a series of distinct services has been identified, the Company generally allocates variable consideration to distinct time increments of service. The Company generally recognizes revenue as it satisfies the related performance obligations over time using a cost-to-cost input method to measure performance progress, because, even where the Company has identified a series of services, its cost incurrence pattern generally is not ratable given the complex nature of the services the Company provides. Invoices are issued and related payments are received, on the basis of performance progress, no less frequently than monthly. In addition, many of the Company's U.S. Government services contracts are time and material arrangements. As a result, the Company often utilizes the practical expedient allowing the recognition of revenue in the amount the Company invoices, which corresponds with the value provided to the customer and to which the Company is entitled to payment for performance to date. Non-U.S. Government Contracts Revenues generated under commercial and state and local government agency contracts are primarily derived from the provision of nuclear and environmental services. Non-U.S. Government contracts typically are one or two years in duration. In determining transaction price, the Company considers incentives and other contingencies to be variable consideration and includes in the initial transaction price the consideration to which the Company expects to be entitled under the terms and conditions of the contract, generally estimated using a most likely amount approach. In the context of variable consideration, the Company limits the transaction price to amounts for which the Company believes a significant reversal of revenue is not probable. Such amounts may relate to transaction price in excess of funding, a lack of history with the customer, a lack of history with the goods or services being provided, or other items. Revenue generally is recognized over time given the terms and conditions of the related contracts. The Company generally utilizes a cost-to-cost input method to measure performance progress, which best depicts the transfer of control to the customer. The Company’s non-U.S. Government contract portfolio is comprised of a large number of time and material arrangements. As a result, the Company often utilizes the practical expedient allowing the recognition of revenue in the amount the Company invoices, which corresponds with the value provided to the customer and to which the Company is entitled to payment for performance to date. Disaggregation of Revenue The following tables present revenues on a disaggregated basis, in a manner that reconciles with the Company's reportable segment disclosures, for the following categories: product versus service type, customer type, contract type, and major program. The Company believes that this level of disaggregation provides investors with information to evaluate the Company’s financial performance and provides the Company with information to make capital allocation decisions in the most appropriate manner. Three Months Ended March 31, 2021 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 604 $ 1,101 $ 16 $ — $ 1,721 Service revenues 42 304 211 — 557 Intersegment 3 2 32 (37) — Sales and service revenues $ 649 $ 1,407 $ 259 $ (37) $ 2,278 Customer Type Federal $ 646 $ 1,405 $ 206 $ — $ 2,257 Commercial — — 21 — 21 Intersegment 3 2 32 (37) — Sales and service revenues $ 649 $ 1,407 $ 259 $ (37) $ 2,278 Contract Type Firm fixed-price $ 11 $ 8 $ 39 $ — $ 58 Fixed-price incentive 595 722 3 — 1,320 Cost-type 40 675 120 — 835 Time and materials — — 65 — 65 Intersegment 3 2 32 (37) — Sales and service revenues $ 649 $ 1,407 $ 259 $ (37) $ 2,278 Three Months Ended March 31, 2020 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 578 $ 1,046 $ — $ — $ 1,624 Service revenues 50 293 296 — 639 Intersegment 1 2 21 (24) — Sales and service revenues $ 629 $ 1,341 $ 317 $ (24) $ 2,263 Customer Type Federal $ 628 $ 1,339 $ 228 $ — $ 2,195 Commercial — — 68 — 68 Intersegment 1 2 21 (24) — Sales and service revenues $ 629 $ 1,341 $ 317 $ (24) $ 2,263 Contract Type Firm fixed-price $ 15 $ 2 $ 59 $ — $ 76 Fixed-price incentive 523 638 — — 1,161 Cost-type 90 699 133 — 922 Time and materials — — 104 — 104 Intersegment 1 2 21 (24) — Sales and service revenues $ 629 $ 1,341 $ 317 $ (24) $ 2,263 Three Months Ended Three Months Ended ($ in millions) 2021 2020 Major Programs Amphibious assault ships $ 357 $ 347 Surface combatants and coast guard cutters 287 279 Other 5 3 Total Ingalls 649 629 Aircraft carriers 758 698 Submarines 457 455 Other 192 188 Total Newport News 1,407 1,341 Government and energy services 245 253 Oil and gas services 14 64 Total Technical Solutions 259 317 Intersegment eliminations (37) (24) Sales and service revenues $ 2,278 $ 2,263 As of March 31, 2021, the Company had $48.8 billion of remaining performance obligations. The Company expects to recognize approximately 30% of its remaining performance obligations as revenue through 2022, an additional 30% through 2024, and the balance thereafter. Cumulative Catch-up Adjustments For the three months ended March 31, 2021, net cumulative catch-up adjustments increased operating income and increased diluted earnings per share by $50 million and $0.98, respectively. For the three months ended March 31, 2020, net cumulative catch-up adjustments increased operating income and increased diluted earnings per share by $32 million and $0.62, respectively. Cumulative catch-up adjustments for the three months ended March 31, 2021, included a favorable adjustment of $25 million on a contract at the Company's Ingalls segment, which increased diluted earnings per share by $0.50. No individual adjustment was material to the Company's unaudited condensed consolidated statements of operations and comprehensive income for the three months ended March 31, 2020. Contract Balances Contract balances include accounts receivable, contract assets, and contract liabilities associated with customer contracts. Accounts receivable represent an unconditional right to consideration and include amounts billed and currently due from customers. Contract assets primarily relate to the Company's rights to consideration for work completed but not billed as of the reporting date when the right to payment is not just subject to the passage of time. Fixed-price contracts are generally billed to the customer using either progress payments, whereby amounts are billed monthly as costs are incurred or work is completed, or performance based payments, which are based upon the achievement of specific, measurable events or accomplishments defined and valued at contract inception. Cost-type contracts are typically billed to the customer on a monthly or semi-monthly basis. Contract liabilities relate to advance payments, billings in excess of revenues, and deferred revenue amounts. The Company reports contract balances in a net contract asset or contract liability position on a contract-by-contract basis at the end of each reporting period. The Company’s net contract assets increased $124 million from December 31, 2020, to March 31, 2021, primarily resulting from an increase in contract assets due to revenue on certain U.S. Navy contracts. For the three months ended March 31, 2021, the Company recognized revenue of $397 million related to its contract liabilities as of December 31, 2020. For the three months ended March 31, 2020, the Company recognized revenue of $274 million related to its contract liabilities as of December 31, 2019.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION The Company is organized into three reportable segments: Ingalls, Newport News, and Technical Solutions, consistent with how management makes operating decisions and assesses performance. The following table presents segment results for the three months ended March 31, 2021 and 2020: Three Months Ended ($ in millions) 2021 2020 Sales and Service Revenues Ingalls $ 649 $ 629 Newport News 1,407 1,341 Technical Solutions 259 317 Intersegment eliminations (37) (24) Sales and service revenues $ 2,278 $ 2,263 Operating Income Ingalls $ 91 $ 68 Newport News 93 95 Technical Solutions 7 (7) Segment operating income 191 156 Non-segment factors affecting operating income Operating FAS/CAS Adjustment (40) 63 Non-current state income taxes (4) (4) Operating income $ 147 $ 215 Operating FAS/CAS Adjustment - The Operating FAS/CAS Adjustment represents the difference between the service cost component of our pension and other postretirement benefit plan expense determined in accordance with GAAP ("FAS") and our pension and other postretirement expense under CAS. The following table presents the Company's assets by segment: ($ in millions) March 31, 2021 December 31, 2020 Assets Ingalls $ 1,666 $ 1,612 Newport News 4,302 4,124 Technical Solutions 1,349 1,379 Corporate 897 1,042 Total assets $ 8,214 $ 8,157

Inventoried Costs, Net

Inventoried Costs, Net	3 Months Ended
	Mar. 31, 2021
Inventory Disclosure [Abstract]
Inventoried Costs, Net	INVENTORIED COSTS, NET Inventoried costs were comprised of the following: ($ in millions) March 31, 2021 December 31, 2020 Production costs of contracts in process 1 $ 20 $ 17 Raw material inventory 122 120 Total inventoried costs, net $ 142 $ 137 1 Includes amounts capitalized pursuant to applicable provisions of the FAR and CAS.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill HII performs impairment tests for goodwill as of November 30 of each year and between annual impairment tests if an event occurs or circumstances change that would more likely than not reduce the fair values of the Company's reporting units below their carrying values. Accumulated goodwill impairment losses as of each of March 31, 2021, and December 31, 2020, were $2,906 million. The accumulated goodwill impairment losses for Ingalls as of each of March 31, 2021, and December 31, 2020, were $1,568 million. The accumulated goodwill impairment losses for Newport News as of each of March 31, 2021, and December 31, 2020, were $1,187 million. The accumulated goodwill impairment losses for Technical Solutions as of each of March 31, 2021, and December 31, 2020, were $151 million. For the three months ended March 31, 2021, the carrying amounts of goodwill changed as follows: ($ in millions) Ingalls Newport News Technical Solutions Total Balance as of December 31, 2020 $ 175 $ 721 $ 721 $ 1,617 Adjustments — — (13) (13) Balance as of March 31, 2021 $ 175 $ 721 $ 708 $ 1,604 As of March 31, 2021, the Company recorded goodwill adjustments of $13 million relating to the acquisition of SIS, primarily related to allocations to intangible assets. Other Intangible Assets The Company's purchased intangible assets are amortized on a straight-line basis or a method based on the pattern of benefits over their estimated useful lives. Net intangible assets consist primarily of amounts relating to nuclear-powered aircraft carrier and submarine program intangible assets, with an aggregate weighted-average useful life of 40 years based on the long life cycle of the related programs. Aggregate amortization expense was $13 million and $11 million for the three months ended March 31, 2021 and 2020, respectively. In connection with the SIS purchase in 2020, the Company recorded $13 million of intangible assets pertaining to technology and existing contract backlog, which is being amortized using the pattern of benefits method over a weighted-average life of ten years. In connection with the Hydroid purchase in 2020, the Company recorded $76 million of intangible assets pertaining to existing contract backlog, customer relationships, and technology, which is being amortized using the pattern of benefits method over a weighted-average life of nine years. The Company expects amortization expense for purchased intangible assets of approximately $52 million in 2021, $46 million in 2022, $37 million in 2023, $28 million in 2024, and $28 million in 2025.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The Company's earnings are primarily domestic, and its effective income tax rates on earnings from operations for the three months ended March 31, 2021 and 2020, were 14.5% and 20.4%, respectively. The lower effective tax rate for the three months ended March 31, 2021, was primarily attributable to the tax loss associated with the sale of the Company’s oil and gas business resulting in a reduction in the effective tax rate of 5.5%. For the three months ended March 31, 2021, the Company’s effective tax rate differed from the federal statutory tax rate primarily as a result of the tax loss associated with the sale of its oil and gas business. For the three months ended March 31, 2020, the Company's effective tax rate did not differ materially from the federal statutory corporate income tax rate of 21%. The Company's unrecognized tax benefits increased by $3 million during the three months ended March 31, 2021. As of March 31, 2021, the estimated amounts of the Company's unrecognized tax benefits, excluding interest and penalties, were liabilities of $50 million. Assuming a sustainment of these tax positions, the reversal of $36 million of the accrued amounts would favorably affect the Company's effective federal income tax rate in future periods. The Company recognizes interest and penalties related to unrecognized tax benefits as income tax expense. For the three months ended March 31, 2021, interest resulting from the unrecognized tax benefits noted above increased income tax expense less than $1 million. Non-current state income taxes include deferred state income taxes, which reflect the change in deferred state tax assets and liabilities, and the tax expense or benefit associated with changes in unrecognized state tax benefits in the relevant period. These amounts are recorded within operating income. Current period state income tax expense is charged to contract costs and included in cost of sales and service revenues in segment operating income.

Debt

Debt	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Debt	DEBT Long-term debt consisted of the following: ($ in millions) March 31, 2021 December 31, 2020 Senior notes due December 1, 2027, 3.483% $ 600 $ 600 Senior notes due May 1, 2025, 3.844% 500 500 Senior notes due May 1, 2030, 4.200% 500 500 Mississippi economic development revenue bonds due May 1, 2024, 7.81% 84 84 Gulf opportunity zone industrial development revenue bonds due December 1, 2028, 4.55% 21 21 Less unamortized debt issuance costs (17) (19) Total long-term debt $ 1,688 $ 1,686 Credit Facility - The Company's credit facility (the "Credit Facility") includes a revolving credit facility of $1,250 million, which may be drawn upon during a period of five years from November 22, 2017. The revolving credit facility includes a letter of credit subfacility of $500 million. The Credit Facility contains customary affirmative and negative covenants, as well as a financial covenant based on a maximum total leverage ratio. Each of the Company's existing and future material wholly owned domestic subsidiaries, except those that are specifically designated as unrestricted subsidiaries, are and will be guarantors under the Credit Facility. See Note 17: Subsidiary Guarantors. As of March 31, 2021, the Company had $15 million in issued but undrawn letters of credit and $1,235 million unutilized under the Credit Facility. The Company had unamortized debt issuance costs associated with its credit facilities of $3 million and $5 million as of March 31, 2021, and December 31, 2020, respectively. The terms of the Company’s senior notes limit the Company’s ability and the ability of certain of its subsidiaries to create liens, enter into sale and leaseback transactions, sell assets, and effect consolidations or mergers. The Company had unamortized debt issuance costs associated with its senior notes of $14 million as of each of March 31, 2021, and December 31, 2020. Under the Company's unsecured commercial paper program, the Company may issue up to $1 billion of unsecured commercial paper notes. The Company's debt arrangements contain customary affirmative and negative covenants. The Company was in compliance with all debt covenants during the three months ended March 31, 2021. The estimated fair values of the Company's total long-term debt as of March 31, 2021, and December 31, 2020, were $1,874 million and $1,943 million, respectively. The fair values of the Company's long-term debt were calculated based on recent trades of the Company's debt instruments in inactive markets, which fall within Level 2 under the fair value hierarchy.

Investigations, Claims, and Lit

Investigations, Claims, and Litigation	3 Months Ended
	Mar. 31, 2021
Investigations, Claims, And Litigation [Abstract]
Investigations, Claims, And Litigation	INVESTIGATIONS, CLAIMS, AND LITIGATION The Company is involved in legal proceedings before various courts and administrative agencies, and is periodically subject to government examinations, inquiries and investigations. Pursuant to FASB Accounting Standards Codification 450 Contingencies, the Company has accrued for losses associated with investigations, claims, and litigation when, and to the extent that, loss amounts related to the investigations, claims, and litigation are probable and can be reasonably estimated. The actual losses that might be incurred to resolve such investigations, claims, and litigation may be higher or lower than the amounts accrued. For matters where a material loss is probable or reasonably possible and the amount of loss cannot be reasonably estimated, but the Company is able to reasonably estimate a range of possible losses, the Company will disclose such estimated range in these notes. This estimated range is based on information currently available to the Company and involves elements of judgment and significant uncertainties. Any estimated range of possible loss does not represent the Company's maximum possible loss exposure. For matters as to which the Company is not able to reasonably estimate a possible loss or range of loss, the Company will indicate the reasons why it is unable to estimate the possible loss or range of loss. For matters not specifically described in these notes, the Company does not believe, based on information currently available to it, that it is reasonably possible that the liabilities, if any, arising from such investigations, claims, and litigation will have a material effect on its consolidated financial position, results of operations, or cash flows. The Company has, in certain cases, provided disclosure regarding certain matters for which the Company believes at this time that the likelihood of material loss is remote. False Claims Act Complaint - In 2016, the Company was made aware that it is a defendant in a qui tam False Claims Act lawsuit pending in the U.S. District Court for the Middle District of Florida related to the Company’s purchases of allegedly non-conforming parts from a supplier for use in connection with U.S. Government contracts. In August 2019, the Department of Justice (“DoJ”) declined to intervene in the lawsuit, and the lawsuit was unsealed. The court dismissed the complaint, but the plaintiff was permitted to refile the compliant and did so. The case is at an early stage, and the Company has filed a motion to dismiss the Second Amended Complaint. As a result, the Company is unable to estimate an amount or range of reasonably possible loss or to express an opinion regarding the ultimate outcome of the matter. Insurance Claims - In September 2020, the Company filed a complaint in the Superior Court, State of Vermont, Franklin Unit, seeking a judgment declaring that the Company's business interruption and other losses associated with COVID-19 are covered by the Company's property insurance program. A total of 32 reinsurers are named as defendants in the complaint. The Company also has initiated arbitration proceedings against six other reinsurers seeking similar relief. Prior to filing the complaint and initiating the arbitration proceedings, the Company provided a notice of loss to the reinsurers, but, to date, none of the reinsurers have acknowledged coverage. The full extent of the Company's losses resulting from COVID-19 have not yet been determined, and the process of calculating losses is continuing. Although the Company believes its position is well-founded, no assurances can be provided regarding the ultimate resolution of this matter. U.S. Government Investigations and Claims - Departments and agencies of the U.S. Government have the authority to investigate various transactions and operations of the Company, and the results of such investigations may lead to administrative, civil, or criminal proceedings, the ultimate outcome of which could be fines, penalties, repayments or compensatory, treble, or other damages. U.S. Government regulations provide that certain findings against a contractor may also lead to suspension or debarment from future U.S. Government contracts or the loss of export privileges. Any suspension or debarment would have a material effect on the Company because of its reliance on government contracts. Asbestos Related Claims - HII and its predecessors-in-interest are defendants in a longstanding series of cases that have been and continue to be filed in various jurisdictions around the country, wherein former and current employees and various third parties allege exposure to asbestos containing materials while on or associated with HII premises or while working on vessels constructed or repaired by HII. The cases allege various injuries, including those associated with pleural plaque disease, asbestosis, cancer, mesothelioma, and other alleged asbestos related conditions. In some cases, several of HII's former executive officers are also named as defendants. In some instances, partial or full insurance coverage is available to the Company for its liability and that of its former executive officers. The costs to resolve cases during the three months ended March 31, 2021 and 2020, were immaterial individually and in the aggregate. The Company’s estimate of asbestos-related liabilities is subject to uncertainty because liabilities are influenced by numerous variables that are inherently difficult to predict. Key variables include the number and type of new claims, the litigation process from jurisdiction to jurisdiction and from case to case, reforms made by state and federal courts, and the passage of state or federal tort reform legislation. Although the Company believes the ultimate resolution of current cases will not have a material effect on its consolidated financial position, results of operations, or cash flows, it cannot predict what new or revised claims or litigation might be asserted or what information might come to light and can, therefore, give no assurances regarding the ultimate outcome of asbestos related litigation. Other Litigation - In March 2019, a new dry dock being transported for delivery to Ingalls by a heavy lift ship struck an Ingalls work barge, which in turn was pushed into Delbert D. Black (DDG 119) causing damage to Delbert D. Black (DDG 119), the work barge, and the new dry dock. At the time of the incident, responsibility for the new dry dock remained with the builder and the transport company. Repair work on Delbert D. Black (DDG 119) was completed at U.S. Navy direction. The Company is working with the U.S. Navy to ascertain whether third parties will pay for the repairs to Delbert D. Black (DDG 119) or whether the repairs will be paid under the builder's risk insurance included in the Delbert D. Black (DDG 119) contract. Claims were tendered to the Company's insurers, and the Company has received all outstanding claim proceeds. In April 2019, the Company filed suit in the U.S. District Court for the Southern District of Mississippi seeking, among other relief, damages from negligent third parties. Based on information currently available, management believes it will collect sufficient funds from one or more third parties to compensate for the resulting direct and consequential damages, but failure to collect sufficient funds or the length of time required to collect such funds could result in a material effect on the Company’s financial position, results of operations, or cash flows. The Company and its predecessor-in-interest have been in litigation with the Bolivarian Republic of Venezuela (the "Republic") since 2002 over a contract for the repair, refurbishment, and modernization at Ingalls of two foreign-built frigates. In March 2014, the Company filed an arbitral statement of claim asserting breaches of the contract. The Republic denied the Company’s allegations and asserted counterclaims. In February 2018, the arbitral tribunal awarded the Company approximately $151 million on its claims and awarded the Republic approximately $22 million on its counterclaims. The Company is seeking to enforce and execute upon the award in multiple jurisdictions. No assurances can be provided regarding the ultimate resolution of this matter. The Company is party to various other claims, legal proceedings and investigations that arise in the ordinary course of business, including U.S. Government investigations that could result in administrative, civil, or criminal proceedings involving the Company. The Company is a contractor with the U.S. Government, and such proceedings can therefore include False Claims Act allegations against the Company. Although the Company believes that the resolution of these other claims, legal proceedings and investigations will not have a material effect on its consolidated financial position, results of operations, or cash flows, the Company cannot predict what new or revised claims or litigation might be asserted or what information might come to light and can, therefore, give no assurances regarding the ultimate outcome of these matters.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Contract Performance Contingencies - Contract profit margins may include estimates of revenues for matters on which the customer and the Company have not reached agreement, such as settlements in the process of negotiation, contract changes, claims, and requests for equitable adjustment for unanticipated contract costs. These estimates are based upon management's best assessment of the underlying causal events and circumstances and recognized to the extent of expected recovery based upon contractual entitlements and the probability of successful negotiation with the customer. As of March 31, 2021, amounts recognized in connection with claims and requests for equitable adjustment were not material individually or in the aggregate. Guarantees of Performance Obligations - From time to time in the ordinary course of business, HII enters into joint ventures, teaming agreements, and other business arrangements in connection with the Company's products and services or to pursue strategic objectives. The Company attempts to limit its exposure under these arrangements to its investment or the extent of obligations under the applicable contract. In some cases, however, HII may be required to guarantee performance of the arrangement's obligations and, in such cases, generally obtains cross-indemnification from the other members of the arrangement. In the ordinary course of business, the Company may guarantee obligations of its subsidiaries under certain contracts. Generally, the Company is liable under such guarantees only if its subsidiary is unable to perform its obligations. Historically, the Company has not incurred any substantial liabilities resulting from these guarantees. As of March 31, 2021, the Company was not aware of any existing event of default that would require it to satisfy any of these guarantees. Environmental Matters - The estimated cost to complete environmental remediation has been accrued when it is probable that the Company will incur such costs in the future to address environmental conditions at currently or formerly owned or leased operating facilities, or at sites where it has been named a Potentially Responsible Party ("PRP") by the Environmental Protection Agency or similarly designated by another environmental agency, and the related costs can be estimated by management. These accruals do not include any litigation costs related to environmental matters, nor do they include amounts recorded as asset retirement obligations. To assess the potential impact on the Company's consolidated financial statements, management estimates the range of reasonably possible remediation costs that could be incurred by the Company, taking into account currently available facts on each site, as well as the current state of technology and prior experience remediating contaminated sites. These estimates are reviewed periodically and adjusted to reflect changes in facts and technical and legal circumstances. Management estimates that as of March 31, 2021, the probable estimable future cost for environmental remediation was immaterial. Factors that could result in changes to the Company's estimates include: modification of planned remedial actions, increases or decreases in the estimated time required to remediate, changes to the determination of legally responsible parties, discovery of more extensive contamination than anticipated, changes in laws and regulations affecting remediation requirements, and improvements in remediation technology. Should other PRPs not pay their allocable share of remediation costs, the Company may incur costs exceeding those already estimated and accrued. In addition, there are certain potential remediation sites where the costs of remediation cannot be reasonably estimated. Although management cannot predict whether new information gained as remediation progresses will materially affect the estimated liability accrued, management does not believe that future remediation expenditures will have a material effect on the Company's consolidated financial position, results of operations, or cash flows. Financial Arrangements - In the ordinary course of business, HII uses letters of credit issued by commercial banks to support certain leases, insurance policies, and contractual performance obligations, as well as surety bonds issued by insurance companies principally to support the Company's self-insured workers' compensation plans. As of March 31, 2021, the Company had $15 million in issued but undrawn letters of credit, as indicated in Note 12: Debt, and $272 million of surety bonds outstanding. U.S. Government Claims - From time to time, the U.S. Government communicates to the Company potential claims, disallowed costs, and penalties concerning prior costs incurred by the Company with which the U.S. Government disagrees. When such preliminary findings are presented, the Company and U.S. Government representatives engage in discussions, from which the Company evaluates the merits of the claims and assesses the amounts being questioned. Although the Company believes that the resolution of any of these matters will not have a material effect on its consolidated financial position, results of operations, or cash flows, it cannot predict the ultimate outcome of these matters. Other Matters - In 1985, the Company and the U.S. Navy entered into a settlement agreement to resolve disputes associated with billing and allocating to contracts the cost of workers’ compensation self-insurance, among other matters. In 2016, the Defense Contract Audit Agency ("DCAA") opined that the 1985 settlement agreement did not comply with certain CAS standards and referred the matter to a U.S. Navy’s Contracting Officer. In December 2020, the Contracting Officer issued a determination that the 1985 settlement agreement did not comply with CAS and directed the Company to develop and implement a different process to bill and allocate the cost of workers’ compensation self-insurance. Cumulatively, under the 1985 settlement agreement, the Company has not recognized as allowable billable costs of approximately $120 million due to the difference between CAS and U.S. GAAP Financial Accounting Standards ("FAS") treatment of workers’ compensation cost. Under the 1985 settlement agreement, these costs would be recognized as allowable billable costs in future periods. Though the Company believes the 1985 settlement agreement is CAS-compliant and cannot be unilaterally terminated, the Company will seek to negotiate a resolution of the matter with the Contracting Officer. If a resolution results in the use of a different treatment or billing methodology that does not provide for the Company to recognize as allowable the CAS to FAS difference, the resolution could have a material effect on the Company’s consolidated financial position, results of operations, or cash flows, including an inability to recover any or all of the $120 million of costs not yet billed to the customer. Collective Bargaining Agreements - Of the Company's approximately 42,000 employees, approximately 50% are covered by a total of nine collective bargaining agreements and one site stabilization agreement. Newport News has three collective bargaining agreements covering represented employees, which expire in November 2021, December 2022, and April 2024. The collective bargaining agreement that expires in November 2021 covers approximately 50% of Newport News employees. Newport News craft workers employed at the Kesselring Site near Saratoga Springs, New York are represented under an indefinite Department of Energy ("DoE") site agreement. Ingalls has five collective bargaining agreements covering represented employees, all of which expire in March 2022. Approximately 25 Technical Solutions employees in Klamath Falls, Oregon are covered by a collective bargaining agreement that expires in June 2021. The Company believes its relationship with its employees is satisfactory. Collective bargaining agreements generally expire after three Purchase Obligations - Periodically the Company enters into agreements to purchase goods or services that are enforceable and legally binding on the Company and specify all significant terms, including: fixed or minimum quantities to be purchased; fixed, minimum, or variable price provisions; and the approximate timing of the transaction. These obligations are primarily comprised of open purchase order commitments to vendors and subcontractors pertaining to funded contracts.

Employee Pension And Other Post

Employee Pension And Other Postretirement Benefits	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Employee Pension and Other Postretirement Benefits	EMPLOYEE PENSION AND OTHER POSTRETIREMENT BENEFITSThe Company provides eligible employees defined benefit pension plans, other postretirement benefit plans, and defined contribution pension plans. The costs of the Company's defined benefit pension plans and other postretirement benefit plans for the three months ended March 31, 2021 and 2020, were as follows: Three Months Ended Pension Benefits Other Benefits ($ in millions) 2021 2020 2021 2020 Components of Net Periodic Benefit Cost Service cost $ 50 $ 45 $ 3 $ 2 Interest cost 60 64 3 4 Expected return on plan assets (138) (121) — — Amortization of prior service cost (credit) 4 3 (1) (5) Amortization of net actuarial loss (gain) 27 27 (1) (2) Net periodic benefit cost $ 3 $ 18 $ 4 $ (1) The Company made the following contributions to its defined benefit pension plans and other postretirement benefit plans for the three months ended March 31, 2021 and 2020: Three Months Ended ($ in millions) 2021 2020 Pension plans Discretionary Qualified $ 60 $ 20 Non-qualified 2 2 Other benefit plans 10 8 Total contributions $ 72 $ 30 As of March 31, 2021, the Company anticipates no further significant cash contributions to its qualified defined benefit pension plans in 2021.

Subsidiary Guarantors

Subsidiary Guarantors	3 Months Ended
	Mar. 31, 2021
Subsidiary Guarantors [Abstract]
Subsidiary Guarantors	SUBSIDIARY GUARANTORSAs described in Note 12: Debt, the Company issued senior notes through the consolidating parent company, HII.  Performance of the Company's obligations under its senior notes outstanding as of March 31, 2021, and December 31, 2020, including any repurchase obligations resulting from a change of control, is fully and unconditionally guaranteed, jointly and severally, on an unsecured basis, by each of HII's existing and future material domestic subsidiaries ("Subsidiary Guarantors"). The Subsidiary Guarantors are 100% owned by HII. Under SEC Regulation S-X Rule 3-10, each HII subsidiary that did not provide a guarantee ("Non-Guarantors") is minor and HII, as the parent company issuer, did not have independent assets or operations. There are no significant restrictions on the ability of the parent company and the Subsidiary Guarantors to obtain funds from their respective subsidiaries by dividend or loan, except those imposed by applicable law.

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles of Consolidation	Principles of Consolidation - The unaudited condensed consolidated financial statements of HII and its subsidiaries have been prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP") and the instructions to Form 10-Q promulgated by the Securities and Exchange Commission ("SEC"). All intercompany transactions and balances are eliminated in consolidation. For classification of current assets and liabilities related to its long-term production contracts, the Company uses the duration of these contracts as its operating cycle, which is generally longer than one year. These unaudited condensed consolidated financial statements include all adjustments of a normal recurring nature considered necessary by management for a fair presentation of the unaudited condensed consolidated financial position, results of operations, and cash flows and should be read in conjunction with the Company's audited consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2020.
Fiscal Period Policy	The quarterly information is labeled using a calendar convention; that is, first quarter is consistently labeled as ending on March 31, second quarter as ending on June 30, and third quarter as ending on September 30. It is management's long-standing practice to establish interim closing dates using a "fiscal" calendar, which requires the businesses to close their books on a Friday near these quarter-end dates in order to normalize the potentially disruptive effects of quarterly closings on business processes. The effects of this practice only exist for interim periods within a reporting year.
Accounting Estimates	Accounting Estimates - The preparation of the Company's unaudited condensed consolidated financial statements requires management to make estimates and judgments that affect the reported amounts of assets and liabilities and the disclosure of contingencies at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Estimates have been prepared on the basis of the most current and best available information, and actual results could differ materially from those estimates. Additionally, the Company has incorporated realized and estimated future effects of the global outbreak of coronavirus disease 2019 (“COVID-19”), including, among other things, orders of civil authorities associated with COVID-19 and steps taken to mitigate the effects of COVID-19 (collectively, “COVID-19 Events”), with respect to contract costs and revenue recognition, effective income tax rates, and the fair values of the Company’s long-lived assets, financial instruments, intangible assets, and goodwill recorded at our reporting units. While costs related to COVID-19 Events are allowable under U.S. Government contracts, the Company's estimates of the effects of COVID-19 Events reflect uncertainty regarding the Company's ability to recover the full costs related to COVID-19 Events under government relief actions such as the Coronavirus Aid, Relief, and Economic Security Act (the "CARES Act") and U.S. Department of Defense ("DoD") guidance.
Government Grants	Government Grants - The Company recognizes incentive grants, inclusive of transfers of depreciable assets, from federal, state, and local governments at fair value upon compliance with the conditions of their receipt and reasonable assurance that the grants will be received or the depreciable assets will be transferred. Grants in recognition of specific expenses are recognized in the same period as an offset to those related expenses. Grants related to depreciable assets are recognized over the periods and in the proportions in which depreciation expense on those assets is recognized. For the three months ended March 31, 2021, the Company recognized cash grant benefits of approximately $1 million in other long-term liabilities in the unaudited condensed consolidated statements of financial position. For the three months ended March 31, 2020, the Company recognized cash grant benefits of approximately $5 million in other long-term liabilities in the unaudited condensed consolidated statements of financial position.
Fair Value of Financial Instruments	Fair Value of Financial Instruments - Except for the Company's long-term debt, the carrying amounts of the Company's financial instruments recorded at historical cost approximate fair value due to the short-term nature of the instruments and low credit risk associated with the respective counterparties.
Loan Receivable	Loan Receivable - The Company holds a loan receivable in connection with a seller financed transaction involving its previously owned Avondale Shipyard facility. The receivable is carried at amortized cost of $34 million, net of $15 million of loan discount as of each of March 31, 2021, and December 31, 2020, which approximates fair value and is recorded in miscellaneous other assets on the unaudited condensed consolidated statements of financial position. Interest income is recognized on an accrual basis using the effective yield method. The discount is accreted into income using the effective yield method over the estimated life of the loan receivable.
Other Current Liabilities	Other Current Liabilities - Other current liabilities were $531 million as of March 31, 2021, and $462 million as of December 31, 2020. Payroll taxes payable, which is a component of other current liabilities, was $127 million as of March 31, 2021, and $125 million as of December 31, 2020. No other component of other current liabilities was more than 5% of total current liabilities.
Related Party Transactions	Related Party Transactions - The Company had $84 million outstanding under Industrial Revenue Bonds issued by the Mississippi Business Finance Corporation as of each of March 31, 2021, and December 31, 2020. Prior to the Company's spinoff from Northrop Grumman Corporation, repayment of principal and interest was guaranteed by Northrop Grumman Systems Corporation. The guaranty remains in effect, and the Company has agreed to indemnify Northrop Grumman Systems Corporation for any losses related to the guaranty pursuant to the Separation and Distribution Agreement with Northrop Grumman Corporation.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2021
Stockholders' Equity Note [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2021 and 2020, were as follows: ($ in millions) Benefit Plans Other Total Balance as of December 31, 2019 $ (1,407) $ (2) $ (1,409) Other comprehensive loss before reclassifications — (2) (2) Amounts reclassified from accumulated other comprehensive loss Amortization of prior service credit 1 (2) — (2) Amortization of net actuarial loss 1 25 — 25 Tax expense for items of other comprehensive income (6) — (6) Net current period other comprehensive income (loss) 17 (2) 15 Balance as of March 31, 2020 $ (1,390) $ (4) $ (1,394) Balance as of December 31, 2020 $ (1,546) $ (1) $ (1,547) Other comprehensive income before reclassifications — 2 2 Amounts reclassified from accumulated other comprehensive loss Amortization of prior service cost 1 3 — 3 Amortization of net actuarial loss 1 26 — 26 Tax expense for items of other comprehensive income (7) — (7) Net current period other comprehensive income 22 2 24 Balance as of March 31, 2021 $ (1,524) $ 1 $ (1,523)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Calculation of Basic and Diluted Earnings Per Share	Basic and diluted earnings per common share were calculated as follows: Three Months Ended (in millions, except per share amounts) 2021 2020 Net earnings $ 148 $ 172 Weighted-average common shares outstanding 40.2 40.7 Net dilutive effect of stock awards — — Dilutive weighted-average common shares outstanding 40.2 40.7 Earnings per share - basic $ 3.68 $ 4.23 Earnings per share - diluted $ 3.68 $ 4.23

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2021
Disaggregation of Revenue [Abstract]
Disaggregation of Revenue [Table Text Block]	The following tables present revenues on a disaggregated basis, in a manner that reconciles with the Company's reportable segment disclosures, for the following categories: product versus service type, customer type, contract type, and major program. The Company believes that this level of disaggregation provides investors with information to evaluate the Company’s financial performance and provides the Company with information to make capital allocation decisions in the most appropriate manner. Three Months Ended March 31, 2021 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 604 $ 1,101 $ 16 $ — $ 1,721 Service revenues 42 304 211 — 557 Intersegment 3 2 32 (37) — Sales and service revenues $ 649 $ 1,407 $ 259 $ (37) $ 2,278 Customer Type Federal $ 646 $ 1,405 $ 206 $ — $ 2,257 Commercial — — 21 — 21 Intersegment 3 2 32 (37) — Sales and service revenues $ 649 $ 1,407 $ 259 $ (37) $ 2,278 Contract Type Firm fixed-price $ 11 $ 8 $ 39 $ — $ 58 Fixed-price incentive 595 722 3 — 1,320 Cost-type 40 675 120 — 835 Time and materials — — 65 — 65 Intersegment 3 2 32 (37) — Sales and service revenues $ 649 $ 1,407 $ 259 $ (37) $ 2,278 Three Months Ended March 31, 2020 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 578 $ 1,046 $ — $ — $ 1,624 Service revenues 50 293 296 — 639 Intersegment 1 2 21 (24) — Sales and service revenues $ 629 $ 1,341 $ 317 $ (24) $ 2,263 Customer Type Federal $ 628 $ 1,339 $ 228 $ — $ 2,195 Commercial — — 68 — 68 Intersegment 1 2 21 (24) — Sales and service revenues $ 629 $ 1,341 $ 317 $ (24) $ 2,263 Contract Type Firm fixed-price $ 15 $ 2 $ 59 $ — $ 76 Fixed-price incentive 523 638 — — 1,161 Cost-type 90 699 133 — 922 Time and materials — — 104 — 104 Intersegment 1 2 21 (24) — Sales and service revenues $ 629 $ 1,341 $ 317 $ (24) $ 2,263 Three Months Ended Three Months Ended ($ in millions) 2021 2020 Major Programs Amphibious assault ships $ 357 $ 347 Surface combatants and coast guard cutters 287 279 Other 5 3 Total Ingalls 649 629 Aircraft carriers 758 698 Submarines 457 455 Other 192 188 Total Newport News 1,407 1,341 Government and energy services 245 253 Oil and gas services 14 64 Total Technical Solutions 259 317 Intersegment eliminations (37) (24) Sales and service revenues $ 2,278 $ 2,263

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Segment operating results	The following table presents segment results for the three months ended March 31, 2021 and 2020: Three Months Ended ($ in millions) 2021 2020 Sales and Service Revenues Ingalls $ 649 $ 629 Newport News 1,407 1,341 Technical Solutions 259 317 Intersegment eliminations (37) (24) Sales and service revenues $ 2,278 $ 2,263 Operating Income Ingalls $ 91 $ 68 Newport News 93 95 Technical Solutions 7 (7) Segment operating income 191 156 Non-segment factors affecting operating income Operating FAS/CAS Adjustment (40) 63 Non-current state income taxes (4) (4) Operating income $ 147 $ 215
Segment assets	The following table presents the Company's assets by segment: ($ in millions) March 31, 2021 December 31, 2020 Assets Ingalls $ 1,666 $ 1,612 Newport News 4,302 4,124 Technical Solutions 1,349 1,379 Corporate 897 1,042 Total assets $ 8,214 $ 8,157

Inventoried Costs, Net (Tables)

Inventoried Costs, Net (Tables)	3 Months Ended
	Mar. 31, 2021
Inventory Disclosure [Abstract]
Inventoried costs, net	Inventoried costs were comprised of the following: ($ in millions) March 31, 2021 December 31, 2020 Production costs of contracts in process 1 $ 20 $ 17 Raw material inventory 122 120 Total inventoried costs, net $ 142 $ 137 1 Includes amounts capitalized pursuant to applicable provisions of the FAR and CAS.

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	For the three months ended March 31, 2021, the carrying amounts of goodwill changed as follows: ($ in millions) Ingalls Newport News Technical Solutions Total Balance as of December 31, 2020 $ 175 $ 721 $ 721 $ 1,617 Adjustments — — (13) (13) Balance as of March 31, 2021 $ 175 $ 721 $ 708 $ 1,604

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consisted of the following: ($ in millions) March 31, 2021 December 31, 2020 Senior notes due December 1, 2027, 3.483% $ 600 $ 600 Senior notes due May 1, 2025, 3.844% 500 500 Senior notes due May 1, 2030, 4.200% 500 500 Mississippi economic development revenue bonds due May 1, 2024, 7.81% 84 84 Gulf opportunity zone industrial development revenue bonds due December 1, 2028, 4.55% 21 21 Less unamortized debt issuance costs (17) (19) Total long-term debt $ 1,688 $ 1,686

Employee Pension and Other Po_2

Employee Pension and Other Postretirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs	The costs of the Company's defined benefit pension plans and other postretirement benefit plans for the three months ended March 31, 2021 and 2020, were as follows: Three Months Ended Pension Benefits Other Benefits ($ in millions) 2021 2020 2021 2020 Components of Net Periodic Benefit Cost Service cost $ 50 $ 45 $ 3 $ 2 Interest cost 60 64 3 4 Expected return on plan assets (138) (121) — — Amortization of prior service cost (credit) 4 3 (1) (5) Amortization of net actuarial loss (gain) 27 27 (1) (2) Net periodic benefit cost $ 3 $ 18 $ 4 $ (1)
Schedule of Defined Benefit Plans Disclosures, Cash Contributions	The Company made the following contributions to its defined benefit pension plans and other postretirement benefit plans for the three months ended March 31, 2021 and 2020: Three Months Ended ($ in millions) 2021 2020 Pension plans Discretionary Qualified $ 60 $ 20 Non-qualified 2 2 Other benefit plans 10 8 Total contributions $ 72 $ 30

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Schedule of Status of Stock Awards	The following table summarizes the status of the Company's outstanding stock awards as of March 31, 2021: Stock Awards Weighted-Average Weighted-Average Remaining Contractual Term Total stock awards 459 $ 190.95 1.6

Description of Business (Narrat

Description of Business (Narrative) (Details)	3 Months Ended
	Mar. 31, 2021segments
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	3

Basis of Presentation (Narrativ

Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred gain on receipt of property	$ 1	$ 5
Assets held in rabbi trusts	191		$ 182
Financing Receivable, after Allowance for Credit Loss	34		34
Receivable with Imputed Interest, Discount	15		15
Other current liabilities	531		462
Accrued Payroll Taxes	127		125
Related Party Transaction [Line Items]
Long-term Debt	1,688		1,686
Mississippi Economic Development Revenue Bonds Due May 1, 2024, 7.81% | Bonds
Related Party Transaction [Line Items]
Long-term Debt	$ 84		$ 84
Other Current Liabilities | Maximum
Concentration Risk [Line Items]
Concentration Risk, Percentage	5.00%

Acquisitions and Divestitures (

Acquisitions and Divestitures (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Business Acquisition and Divestitures [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		$ 378
Goodwill, Purchase Accounting Adjustments	$ (13)
Investment in affiliates	(12)
Proceeds from disposition of business	25
Gain on disposition of business	(3)
Hydroid, Inc. [Member]
Business Acquisition and Divestitures [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			$ 377
Cash acquired			2
Goodwill arising from acquisitions			239
Intangible Assets			76
Spatial Integrated Systems, Inc.
Business Acquisition and Divestitures [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			40
Goodwill arising from acquisitions			$ 40
Goodwill, Purchase Accounting Adjustments	(13)
Intangible Assets	13
San Diego Shipyard
Business Acquisition and Divestitures [Line Items]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	83
Investment in affiliates	(12)
Oil and gas services
Business Acquisition and Divestitures [Line Items]
Proceeds from disposition of business	25
Gain on disposition of business	$ 3

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Nov. 05, 2019	Nov. 07, 2017
Stockholders' Equity [Line Items]
Amount authorized for stock repurchase program					$ 3,200	$ 2,200
Repurchased shares of treasury stock	291,581	390,904
Treasury stock activity	$ 50	$ 84
Treasury Stock, Value Acquired, Not Yet Settled for Cash	$ 1
Dividends declared per share	$ 1.14	$ 1.03
Dividends paid	$ 46	$ 42
Accumulated other comprehensive income (loss)	(1,523)	(1,394)	$ (1,547)	$ (1,409)
Benefit Plans
Stockholders' Equity [Line Items]
Accumulated other comprehensive income (loss)	(1,524)	(1,390)	(1,546)	(1,407)
Other
Stockholders' Equity [Line Items]
Accumulated other comprehensive income (loss)	$ 1	$ (4)	$ (1)	$ (2)

Stockholders' Equity Accumulate

Stockholders' Equity Accumulated Other Comprehensive Income (Loss) (Table) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning		$ (1,547)	$ (1,409)
Other comprehensive income (loss) before reclassifications		2	(2)
Amortization of prior service cost (credit)	[1]	3	(2)
Amortization of net actuarial loss (gain)	[1]	26	25
Tax benefit (expense) for items of other comprehensive income		(7)	(6)
Other comprehensive income (loss), net of tax		24	15
Balance, ending		(1,523)	(1,394)
Income tax expense (benefit)		25	44
Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning		(1,546)	(1,407)
Amortization of prior service cost (credit)	[1]	3	(2)
Amortization of net actuarial loss (gain)	[1]	26	25
Tax benefit (expense) for items of other comprehensive income		(7)	(6)
Other comprehensive income (loss), net of tax		22	17
Balance, ending		(1,524)	(1,390)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning		(1)	(2)
Other comprehensive income (loss) before reclassifications		2	(2)
Other comprehensive income (loss), net of tax		2	(2)
Balance, ending		1	(4)
Reclassification out of AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)		$ 7	$ 6
[1]	These accumulated comprehensive loss components are included in the computation of net periodic benefit cost. See Note 15: Employee Pension and Other Postretirement Benefits. The tax benefit associated with amounts reclassified from accumulated other comprehensive loss for the three months ended March 31, 2021 and 2020, was $7 million and $6 million, respectively.

Basic and Diluted Earnings Per

Basic and Diluted Earnings Per Share (Table) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share, Basic and Diluted [Abstract]
Net earnings (loss)	$ 148	$ 172
Weighted-average common shares outstanding (in shares)	40.2	40.7
Dilutive weighted-average common shares outstanding (in shares)	40.2	40.7
Earnings (loss) per share - basic (in dollars per share)	$ 3.68	$ 4.23
Earnings (loss) per share - diluted (in dollars per share)	$ 3.68	$ 4.23

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restricted performance stock rights
Antidilutive Securities Excluded from Computation of Earnings Per Share
Number of shares from stock awards excluded from computation of earnings per share	0.4	0.3

Revenue (Table) (Details)

Revenue (Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Sales and service revenues	$ 2,278	$ 2,263
Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	58	76
Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,320	1,161
Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	835	922
Time-and-materials
Disaggregation of Revenue [Line Items]
Sales and service revenues	65	104
Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	2,257	2,195
Commercial
Disaggregation of Revenue [Line Items]
Sales and service revenues	21	68
Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,721	1,624
Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	557	639
Ingalls
Disaggregation of Revenue [Line Items]
Sales and service revenues	649	629
Intersegment	3	1
Ingalls | Amphibious assault ships
Disaggregation of Revenue [Line Items]
Sales and service revenues	357	347
Ingalls | Surface combatants and coast guard cutters
Disaggregation of Revenue [Line Items]
Sales and service revenues	287	279
Ingalls | Other programs
Disaggregation of Revenue [Line Items]
Sales and service revenues	5	3
Ingalls | Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	11	15
Ingalls | Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	595	523
Ingalls | Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	40	90
Ingalls | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	3	1
Ingalls | Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	646	628
Ingalls | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	3	1
Ingalls | Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	604	578
Ingalls | Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	42	50
Newport News
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,407	1,341
Intersegment	2	2
Newport News | Aircraft carriers
Disaggregation of Revenue [Line Items]
Sales and service revenues	758	698
Newport News | Submarines
Disaggregation of Revenue [Line Items]
Sales and service revenues	457	455
Newport News | Other programs
Disaggregation of Revenue [Line Items]
Sales and service revenues	192	188
Newport News | Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	8	2
Newport News | Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	722	638
Newport News | Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	675	699
Newport News | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	2	2
Newport News | Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,405	1,339
Newport News | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	2	2
Newport News | Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,101	1,046
Newport News | Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	304	293
Technical Solutions
Disaggregation of Revenue [Line Items]
Sales and service revenues	259	317
Intersegment	32	21
Technical Solutions | Government and energy services
Disaggregation of Revenue [Line Items]
Sales and service revenues	245	253
Technical Solutions | Oil and gas services
Disaggregation of Revenue [Line Items]
Sales and service revenues	14	64
Technical Solutions | Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	39	59
Technical Solutions | Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	3
Technical Solutions | Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	120	133
Technical Solutions | Time-and-materials
Disaggregation of Revenue [Line Items]
Sales and service revenues	65	104
Technical Solutions | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	32	21
Technical Solutions | Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	206	228
Technical Solutions | Commercial
Disaggregation of Revenue [Line Items]
Sales and service revenues	21	68
Technical Solutions | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	32	21
Technical Solutions | Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	16
Technical Solutions | Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	211	296
Intersegment Elimination
Disaggregation of Revenue [Line Items]
Sales and service revenues	(37)	(24)
Intersegment	(37)	(24)
Intersegment Elimination | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	(37)	(24)
Intersegment Elimination | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	$ (37)	$ (24)

Revenue (Narrative) (Details)

Revenue (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 48,800
Revenue, performance obligation, recognition percentage, year two	30.00%
Revenue, performance obligation, recognition percentage, year four	30.00%
Increase (Decrease) in Net Contract Assets	$ 124
Contract with Customer, Liability, Revenue Recognized	397	$ 274
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate
Increase (decrease) in operating income due to net cumulative catch-up adjustments	$ 50	$ 32
Increase (decrease) in diluted earnings per share due to net cumulative catch-up adjustments	$ 0.98	$ 0.62
Ingalls contract [Member] | Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate
Increase (decrease) in operating income due to net cumulative catch-up adjustments	$ 25
Increase (decrease) in diluted earnings per share due to net cumulative catch-up adjustments	$ 0.50

Segment Information (Narrative)

Segment Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2021segments
Segment Reporting [Abstract]
Number of reportable segments	3

Segment Operating Results (Tabl

Segment Operating Results (Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Sales and Service Revenues
Sales and service revenue	$ 2,278	$ 2,263
Operating Income (Loss)
Operating income (loss)	147	215
Operating Segments
Operating Income (Loss)
Operating income (loss)	191	156
Ingalls
Sales and Service Revenues
Sales and service revenue	649	629
Operating Income (Loss)
Operating income (loss)	91	68
Newport News
Sales and Service Revenues
Sales and service revenue	1,407	1,341
Operating Income (Loss)
Operating income (loss)	93	95
Technical Solutions
Sales and Service Revenues
Sales and service revenue	259	317
Operating Income (Loss)
Operating income (loss)	7	(7)
Intersegment Elimination
Sales and Service Revenues
Sales and service revenue	(37)	(24)
Non-segment factors affecting operating income (loss)
Non-segment factors affecting operating income (loss)
Operating FAS/CAS Adjustment	(40)	63
Non-current state income taxes	$ (4)	$ (4)

Segment Assets (Table) (Details

Segment Assets (Table) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Segment Reporting Information
Assets	$ 8,214	$ 8,157
Ingalls
Segment Reporting Information
Assets	1,666	1,612
Newport News
Segment Reporting Information
Assets	4,302	4,124
Technical Solutions
Segment Reporting Information
Assets	1,349	1,379
Corporate
Segment Reporting Information
Assets	$ 897	$ 1,042

Inventoried Costs, Net (Table)

Inventoried Costs, Net (Table) (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Inventoried costs	[1]	$ 20	$ 17
Raw material inventory		122	120
Total inventoried costs, net		$ 142	$ 137
[1]	Includes amounts capitalized pursuant to applicable provisions of the FAR and CAS.

Goodwill (Narrative) (Details)

Goodwill (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Goodwill
Accumulated goodwill impairment losses	$ 2,906	$ 2,906
Goodwill, Purchase Accounting Adjustments	(13)
Spatial Integrated Systems, Inc.
Goodwill
Goodwill, Purchase Accounting Adjustments	(13)
Ingalls
Goodwill
Accumulated goodwill impairment losses	1,568	1,568
Newport News
Goodwill
Accumulated goodwill impairment losses	1,187	1,187
Technical Solutions
Goodwill
Accumulated goodwill impairment losses	151	$ 151
Goodwill, Purchase Accounting Adjustments	$ (13)

Change in Carrying Amount of Go

Change in Carrying Amount of Goodwill (Table) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)
Goodwill [Roll Forward]
Goodwill beginning balance	$ 1,617
Goodwill, Purchase Accounting Adjustments	(13)
Goodwill ending balance	1,604
Ingalls
Goodwill [Roll Forward]
Goodwill beginning balance	175
Goodwill ending balance	175
Newport News
Goodwill [Roll Forward]
Goodwill beginning balance	721
Goodwill ending balance	721
Technical Solutions
Goodwill [Roll Forward]
Goodwill beginning balance	721
Goodwill, Purchase Accounting Adjustments	(13)
Goodwill ending balance	$ 708

Other Intangible Assets (Narrat

Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Aggregate weighted-average amortization period	40 years
Amortization of purchased intangibles	$ 13	$ 11
Expected amortization for purchased intangible assets:
Expected amortization, 2021	52
Expected amortization, 2022	46
Expected amortization, 2023	37
Expected amortization, 2024	28
Expected amortization, 2025	$ 28
Hydroid, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Aggregate weighted-average amortization period			9 years
Identifiable intangible assets acquired			$ 76
Spatial Integrated Systems, Inc.
Finite-Lived Intangible Assets [Line Items]
Aggregate weighted-average amortization period	10 years
Identifiable intangible assets acquired	$ 13

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Contingency [Line Items]
Effective income tax rate	14.50%	20.40%
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent	5.50%
Federal Statutory Income Tax Rate, Percent	21.00%
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 3
Unrecognized Tax Benefits	50
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	36
Maximum
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 1

Schedule of Long-term debt (Tab

Schedule of Long-term debt (Table) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 1,688	$ 1,686
Less unamortized debt issuance costs	(17)	(19)
Senior Notes
Debt Instrument [Line Items]
Less unamortized debt issuance costs	(14)	(14)
Senior Notes | Senior notes due December 1, 2027, 3.483% [Member]
Debt Instrument [Line Items]
Long-term debt	$ 600	$ 600
Debt Instrument, Interest Rate, Stated Percentage	3.483%	3.483%
Senior Notes | Senior notes due May 1, 2025, 3.844% [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500	$ 500
Debt Instrument, Interest Rate, Stated Percentage	3.844%	3.844%
Senior Notes | Senior notes due May 1, 2030, 4.200%
Debt Instrument [Line Items]
Long-term debt	$ 500	$ 500
Debt Instrument, Interest Rate, Stated Percentage	4.20%	4.20%
Bonds | Mississippi Economic Development Revenue Bonds Due May 1, 2024, 7.81%
Debt Instrument [Line Items]
Long-term debt	$ 84	$ 84
Debt Instrument, Interest Rate, Stated Percentage	7.81%	7.81%
Bonds | Gulf Opportunity Zone Industrial Development Revenue Bonds Due December 1, 2028, 4.55%
Debt Instrument [Line Items]
Long-term debt	$ 21	$ 21
Debt Instrument, Interest Rate, Stated Percentage	4.55%	4.55%

Credit Facility (Narrative) (De

Credit Facility (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Credit Facility
Long-term Debt	$ 1,688	$ 1,686
Unamortized Debt Issuance Expense	17	19
Revolving Credit Facility
Credit Facility
Credit facility revolver	$ 1,250
Debt Instrument, Contractual Term	5 years
Letters of credit issued but undrawn	$ 15
Line of Credit Facility, Remaining Borrowing Capacity	1,235
Unamortized Debt Issuance Expense	3	$ 5
Revolving Credit Facility | Letter of Credit
Credit Facility
Credit facility revolver	$ 500

Debt Commercial Paper (Narrativ

Debt Commercial Paper (Narrative) (Details) $ in Billions	Mar. 31, 2021USD ($)
Maximum
Short-term Debt [Line Items]
Commercial Paper	$ 1

Debt Senior Note (Narrative) (D

Debt Senior Note (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term Debt	$ 1,688	$ 1,686
Unamortized Debt Issuance Expense	17	19
Senior Notes
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ 14	$ 14

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Fair value of long term debt	$ 1,874	$ 1,943
Long-term Debt, Maturities, Repayments of Principal in Year Three	84
Long-term Debt, Maturities, Repayments of Principal in Year Four	$ 500

Investigations, Claims, and L_2

Investigations, Claims, and Litigation (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)numberOfReinsurersfrigates
Loss Contingencies
Number of reinsurers/defendants | numberOfReinsurers	32
Bolivarian Republic of Venezuela
Loss Contingencies
Number of Foreign Built Frigates | frigates	2
Arbitral statement claim | $	$ 151
Arbitration
Loss Contingencies
Number of reinsurers/defendants | numberOfReinsurers	6
Litigation counter claim [Member] | Bolivarian Republic of Venezuela
Loss Contingencies
Arbitral statement claim | $	$ 22

Commitments and Contingencies (

Commitments and Contingencies (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)
Commitments and Contingencies
Entity Number of Employees	42,000
Percentage of workforce subject to Collective Bargaining Arrangements	50.00%
Number of Collective Bargaining Agreements	9
Worker's compensation costs, not yet billable	$ 120
Surety Bonds Outstanding
Commitments and Contingencies
Surety bonds outstanding	272
Revolving Credit Facility [Member]
Commitments and Contingencies
Letters of credit issued but undrawn	$ 15
Minimum
Commitments and Contingencies
Period Covered by Collective Bargaining Agreements	3 years
Maximum
Commitments and Contingencies
Period Covered by Collective Bargaining Agreements	5 years
Newport News
Commitments and Contingencies
Number of Collective Bargaining Agreements	3
Ingalls
Commitments and Contingencies
Number of Collective Bargaining Agreements	5
Technical Solutions
Commitments and Contingencies
Entity Number of Employees	25
United Steelworkers [Member] | Newport News
Commitments and Contingencies
Percentage of workforce subject to Collective Bargaining Arrangements	50.00%

Employee Pension and Other Po_3

Employee Pension and Other Postretirement Benefits Net Benefit Costs (Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension Benefits
Defined Benefit Plan Disclosure
Service cost	$ 50	$ 45
Interest cost	60	64
Expected return on plan assets	(138)	(121)
Amortization of prior service cost (credit)	4	3
Amortization of net actuarial loss (gain)	27	27
Net periodic benefit cost	3	18
Other Benefits
Defined Benefit Plan Disclosure
Service cost	3	2
Interest cost	3	4
Amortization of prior service cost (credit)	(1)	(5)
Amortization of net actuarial loss (gain)	(1)	(2)
Net periodic benefit cost	$ 4	$ (1)

Employee Pension and Other Po_4

Employee Pension and Other Postretirement Benefits Cash Contributions (Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan Disclosure
Other benefit plans	$ 10	$ 8
Total contributions	72	30
Discretionary Contribution | Qualified
Defined Benefit Plan Disclosure
Pension contributions	60	20
Discretionary Contribution | Non-qualified
Defined Benefit Plan Disclosure
Pension contributions	$ 2	$ 2

Stock Compensation Plans (Narra

Stock Compensation Plans (Narrative) (Details) - $ / shares shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock awards
Stock rights, weighted-average grant date fair value	$ 190.95
Stock awards, vested in the period	0.1	0.1
Maximum
Stock awards
Stock awards, transferred for employee withholding taxes	0.1	0.1
Restricted performance stock rights
Stock awards
Stock rights, granted	0.2	0.1
Stock rights, weighted-average grant date fair value	$ 178.41	$ 229.42
Restricted performance stock rights | Minimum
Stock awards
Restricted performance stock rights ultimate vesting percentage	0.00%
Restricted performance stock rights | Maximum
Stock awards
Restricted performance stock rights ultimate vesting percentage	200.00%

Schedule of Status of Stock Awa

Schedule of Status of Stock Awards (Table) (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2021$ / sharesshares
Stock awards
Stock awards, outstanding | shares	459
Stock awards, weighted-average grant date fair value | $ / shares	$ 190.95
Stock awards, weighted-average remaining contractual term	1 year 7 months 6 days

Stock Compensation Plans Compen

Stock Compensation Plans Compensation and Unrecognized Compensation Expense (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Compensation Expense [Abstract]
Share-based Payment Arrangement, Expense	$ 9	$ 7
Tax benefits for stock-based compensation	$ 2	1
Restricted Stock [Member]
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation expense, period for recognition	1 year 1 month 6 days
Restricted performance stock rights
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation expense	$ 50
Unrecognized compensation expense, period for recognition	1 year 9 months 18 days
Maximum | Stock Awards [Member]
Compensation Expense [Abstract]
Employee Service Share-Based Compensation, Tax Benefit Realized From Issuance Of Instruments Other Than Options	$ 2	$ 2
Maximum | Restricted Stock [Member]
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation expense	$ 1

Subsidiary Guarantors Narrative

Subsidiary Guarantors Narrative (Details)	3 Months Ended
	Mar. 31, 2021
Subsidiary Guarantors [Abstract]
Parent ownership percentage of subsidiary guarantors	100.00%