Huntington Ingalls Industries (HII) 10-Q 5 Aug 21 2021 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 30, 2021
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 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		40,140,682
Amendment Flag	false
Document Fiscal Period Focus	Q2
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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Sales and service revenues
Sales and service revenues	$ 2,231	$ 2,027	$ 4,509	$ 4,290
Cost of sales and service revenues
Income (loss) from operating investments, net	12	7	20	13
Other income and gains	(2)		1
General and administrative expenses	204	214	410	428
Operating income (loss)	128	57	275	272
Other income (expense)
Interest expense	(18)	(25)	(39)	(41)
Non-operating retirement benefit (expense)	44	30	90	60
Other, net	7	3	8	(10)
Earnings (loss) before income taxes	161	65	334	281
Federal and foreign income taxes	32	12	57	56
Net earnings (loss)	$ 129	$ 53	$ 277	$ 225
Basic earnings (loss) per share (in dollars per share)	$ 3.20	$ 1.30	$ 6.87	$ 5.54
Weighted-average common shares outstanding (in shares)	40.3	40.7	40.3	40.6
Diluted earnings (loss) per share	$ 3.20	$ 1.30	$ 6.87	$ 5.54
Weighted-average diluted shares outstanding (in shares)	40.3	40.7	40.3	40.6
Dividends declared per share	$ 1.14	$ 1.03	$ 2.28	$ 2.06
Other comprehensive income (loss)
Change in unamortized benefit plan costs	$ 30	$ 23	$ 59	$ 46
Other		1	2	(1)
Tax benefit (expense) for items of other comprehensive income	(8)	(6)	(15)	(12)
Other comprehensive income (loss), net of tax	22	18	46	33
Comprehensive income (loss)	151	71	323	258
Product [Member]
Sales and service revenues
Sales and service revenues	1,763	1,420	3,484	3,044
Cost of sales and service revenues
Cost of sales and service revenues	1,495	1,253	2,949	2,543
Service [Member]
Sales and service revenues
Sales and service revenues	468	607	1,025	1,246
Cost of sales and service revenues
Cost of sales and service revenues	$ 414	$ 510	$ 896	$ 1,060

Condensed Consolidated Statem_2

Condensed Consolidated Statements Of Financial Position (Unaudited) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 348	$ 512
Accounts receivable, net	443	397
Contract assets	1,182	1,049
Inventoried costs, net	139	137
Income taxes receivable	141	171
Assets held for sale		133
Prepaid expenses and other current assets	64	45
Total current assets	2,317	2,444
Property, plant, and equipment, net	3,004	2,978
Operating lease assets	208	192
Goodwill	1,604	1,617
Other intangible assets, net	499	512
Deferred tax assets	86	133
Miscellaneous other assets	414	281
Total assets	8,132	8,157
Current Liabilities
Trade accounts payable	349	460
Accrued employees' compensation	305	293
Current portion of postretirement plan liabilities	133	133
Current portion of workers' compensation liabilities	229	225
Contract liabilities	660	585
Liabilities held for sale		68
Other current liabilities	447	462
Total current liabilities	2,123	2,226
Long-term debt	1,689	1,686
Pension plan liabilities	853	960
Other postretirement plan liabilities	393	401
Workers' compensation liabilities	519	511
Long-term operating lease liabilities	170	157
Other long-term liabilities	318	315
Total liabilities	6,065	6,256
Commitments and Contingencies (Note 14)
Stockholders' Equity
Common stock	1	1
Additional paid-in capital	1,977	1,972
Retained earnings (deficit)	3,718	3,533
Treasury stock	(2,128)	(2,058)
Accumulated other comprehensive income (loss)	(1,501)	(1,547)
Total stockholders' equity	2,067	1,901
Total liabilities and stockholders' equity	$ 8,132	$ 8,157

Condensed Consolidated Statem_3

Condensed Consolidated Statements Of Financial Position (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ 2	$ 2
Accumulated depreciation	2,075	2,024
Accumulated amortization	$ 681	$ 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)	40,200,000	40,500,000

Condensed Consolidated Statem_4

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating Activities
Net earnings (loss)	$ 277	$ 225
Adjustments to reconcile to net cash provided by (used in) operating activities
Depreciation	102	92
Amortization of purchased intangibles	26	26
Amortization of debt issuance costs	3	3
Provision for doubtful accounts		6
Stock-based compensation	12	13
Deferred income taxes	31	21
Loss (gain) on investments in marketable securities	(12)	5
Change in
Accounts Receivable	(45)	(167)
Contract assets	(127)	(63)
Inventoried costs	(3)	(13)
Prepaid expenses and other assets	(29)	(4)
Accounts payable and accruals	(32)	172
Retiree benefits	(70)	(50)
Other non-cash transactions, net	6	3
Net cash provided by (used in) operating activities	139	269
Investing Activities
Capital expenditure additions	(134)	(150)
Grant proceeds for capital expenditures	2	9
Acquisitions of businesses, net of cash received		(378)
Investment in affiliates	(22)
Proceeds from disposition of business	20
Net cash provided by (used in) investing activities	(134)	(519)
Financing Activities
Proceeds from issuance of long-term debt		1,000
Proceeds from revolving credit facility borrowings		385
Repayment of revolving credit facility borrowings		(385)
Debt issuance costs		(13)
Dividends paid	(92)	(84)
Repurchases of common stock	(70)	(84)
Employee taxes on certain share-based payment arrangements	(7)	(13)
Net cash provided by (used in) financing activities	(169)	806
Change in cash and cash equivalents	(164)	556
Cash and cash equivalents, beginning of period	512	75
Cash and cash equivalents, end of period	348	631
Supplemental Cash Flow Disclosure
Cash paid for income taxes (net of refunds)	21	23
Cash paid for interest	37	32
Non-Cash Investing and Financing Activities
Capital expenditures accrued in accounts payable	$ 5	$ 5

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)	225			225
Dividends declared	(84)			(84)
Other comprehensive income (loss), net of tax	33					33
Treasury stock activity	(84)				(84)
Balance at Jun. 30, 2020	1,678	1	1,961	3,150	(2,058)	(1,376)
Balance at Mar. 31, 2020	1,643	1	1,955	3,139	(2,058)	(1,394)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	53			53
Dividends declared	(42)			(42)
Stock compensation	6		6
Other comprehensive income (loss), net of tax	18					18
Balance at Jun. 30, 2020	1,678	1	1,961	3,150	(2,058)	(1,376)
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)	277			277
Dividends declared	(92)			(92)
Stock compensation	5		5
Other comprehensive income (loss), net of tax	46					46
Treasury stock activity	(70)				(70)
Balance at Jun. 30, 2021	2,067	1	1,977	3,718	(2,128)	(1,501)
Balance at Mar. 31, 2021	1,979	1	1,974	3,635	(2,108)	(1,523)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	129			129
Dividends declared	(46)			(46)
Stock compensation	3		3
Other comprehensive income (loss), net of tax	22					22
Treasury stock activity	(20)				(20)
Balance at Jun. 30, 2021	$ 2,067	$ 1	$ 1,977	$ 3,718	$ (2,128)	$ (1,501)

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared per share	$ 1.14	$ 1.03	$ 2.28	$ 2.06

Description of Business

Description of Business	6 Months Ended
	Jun. 30, 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	6 Months Ended
	Jun. 30, 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 six months ended June 30, 2021, the Company recognized cash grant benefits of approximately $2 million in other long-term liabilities in the unaudited condensed consolidated statements of financial position. For the six months ended June 30, 2020, the Company recognized cash grant benefits of approximately $9 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 $203 million and $182 million as of June 30, 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 was carried at amortized cost of $35 million, net of $14 million of loan discount as of June 30, 2021, and at amortized cost of $34 million, net of $15 million of loan discount as of December 31, 2020, which approximates fair value. The loan receivable 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 $447 million as of June 30, 2021, and $462 million as of December 31, 2020. Payroll taxes payable, which is a component of other current liabilities, was $132 million as of June 30, 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	6 Months Ended
	Jun. 30, 2021
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Standards Updates	ACCOUNTING STANDARDS UPDATESIn December 2019, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Updates ("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	6 Months Ended
	Jun. 30, 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 six months ended June 30, 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 contributed its San Diego Shipyard (“SDSY”) business to a joint venture 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 joint venture contribution 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 contributed assets and liabilities were previously reported in assets and liabilities held for sale. For the six months ended June 30, 2021, the Company transferred $22 million to Titan as part of the exchange.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 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 six months ended June 30, 2021, the Company repurchased 386,463 shares at an aggregate cost of $70 million. For the six months ended June 30, 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 June 30, 2021 and 2020, respectively. The Company declared cash dividends per share of $2.28 and $2.06 for the six months ended June 30, 2021 and 2020, respectively. The Company paid cash dividends totaling $92 million and $84 million for the six months ended June 30, 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 June 30, 2021, was comprised of unamortized benefit plan costs of $1,502 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 $1 million. The changes in accumulated other comprehensive income (loss) by component for the three and six months ended June 30, 2021 and 2020, were as follows: ($ in millions) Benefit Plans Other Total Balance as of March 31, 2020 $ (1,390) $ (4) $ (1,394) Other comprehensive income before reclassifications — 1 1 Amounts reclassified from accumulated other comprehensive loss Amortization of prior service credit 1 (3) — (3) Amortization of net actuarial loss 1 26 — 26 Tax expense for items of other comprehensive income (6) — (6) Net current period other comprehensive income 17 1 18 Balance as of June 30, 2020 $ (1,373) $ (3) $ (1,376) Balance as of March 31, 2021 $ (1,524) $ 1 $ (1,523) Other comprehensive income before reclassifications — — — Amounts reclassified from accumulated other comprehensive loss Amortization of prior service cost 1 3 — 3 Amortization of net actuarial loss 1 27 — 27 Tax expense for items of other comprehensive income (8) — (8) Net current period other comprehensive income 22 — 22 Balance as of June 30, 2021 $ (1,502) $ 1 $ (1,501) ($ in millions) Benefit Plans Other Total Balance as of December 31, 2019 $ (1,407) $ (2) $ (1,409) Other comprehensive loss before reclassifications — (1) (1) Amounts reclassified from accumulated other comprehensive loss Amortization of prior service credit 1 (5) — (5) Amortization of net actuarial loss 1 51 — 51 Tax expense for items of other comprehensive income (12) — (12) Net current period other comprehensive income (loss) 34 (1) 33 Balance as of June 30, 2020 $ (1,373) $ (3) $ (1,376) 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 6 — 6 Amortization of net actuarial loss 1 53 — 53 Tax expense for items of other comprehensive income (15) — (15) Net current period other comprehensive income 44 2 46 Balance as of June 30, 2021 $ (1,502) $ 1 $ (1,501)

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 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 Six Months Ended (in millions, except per share amounts) 2021 2020 2021 2020 Net earnings $ 129 $ 53 $ 277 $ 225 Weighted-average common shares outstanding 40.3 40.7 40.3 40.6 Net dilutive effect of stock awards — — — — Dilutive weighted-average common shares outstanding 40.3 40.7 40.3 40.6 Earnings per share - basic $ 3.20 $ 1.30 $ 6.87 $ 5.54 Earnings per share - diluted $ 3.20 $ 1.30 $ 6.87 $ 5.54 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 and six months ended June 30, 2021 and 2020, respectively.

Revenue

Revenue	6 Months Ended
	Jun. 30, 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 June 30, 2021 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 624 $ 1,111 $ 28 $ — $ 1,763 Service revenues 41 248 179 — 468 Intersegment 5 4 30 (39) — Sales and service revenues $ 670 $ 1,363 $ 237 $ (39) $ 2,231 Customer Type Federal $ 665 $ 1,359 $ 200 $ — $ 2,224 Commercial — — 7 — 7 Intersegment 5 4 30 (39) — Sales and service revenues $ 670 $ 1,363 $ 237 $ (39) $ 2,231 Contract Type Firm fixed-price $ 13 $ 7 $ 41 $ — $ 61 Fixed-price incentive 610 713 — — 1,323 Cost-type 42 639 111 — 792 Time and materials — — 55 — 55 Intersegment 5 4 30 (39) — Sales and service revenues $ 670 $ 1,363 $ 237 $ (39) $ 2,231 Three Months Ended June 30, 2020 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 564 $ 826 $ 30 $ — $ 1,420 Service revenues 57 294 256 — 607 Intersegment 1 2 34 (37) — Sales and service revenues $ 622 $ 1,122 $ 320 $ (37) $ 2,027 Customer Type Federal $ 621 $ 1,119 $ 223 $ — $ 1,963 Commercial — 1 62 — 63 State and local government agencies — — 1 — 1 Intersegment 1 2 34 (37) — Sales and service revenues $ 622 $ 1,122 $ 320 $ (37) $ 2,027 Contract Type Firm fixed-price $ 16 $ 1 $ 62 $ — $ 79 Fixed-price incentive 535 493 — — 1,028 Cost-type 70 626 113 — 809 Time and materials — — 111 — 111 Intersegment 1 2 34 (37) — Sales and service revenues $ 622 $ 1,122 $ 320 $ (37) $ 2,027 Six Months Ended June 30, 2021 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 1,228 $ 2,212 $ 44 $ — $ 3,484 Service revenues 83 552 390 — 1,025 Intersegment 8 6 62 (76) — Sales and service revenues $ 1,319 $ 2,770 $ 496 $ (76) $ 4,509 Customer Type Federal $ 1,311 $ 2,764 $ 406 $ — $ 4,481 Commercial — — 28 — 28 Intersegment 8 6 62 (76) — Sales and service revenues $ 1,319 $ 2,770 $ 496 $ (76) $ 4,509 Contract Type Firm fixed-price $ 24 $ 15 $ 80 $ — $ 119 Fixed-price incentive 1,205 1,435 3 — 2,643 Cost-type 82 1,314 231 — 1,627 Time and materials — — 120 — 120 Intersegment 8 6 62 (76) — Sales and service revenues $ 1,319 $ 2,770 $ 496 $ (76) $ 4,509 Six Months Ended June 30, 2020 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 1,142 $ 1,872 $ 30 $ — $ 3,044 Service revenues 107 587 552 — 1,246 Intersegment 2 4 55 (61) — Sales and service revenues $ 1,251 $ 2,463 $ 637 $ (61) $ 4,290 Customer Type Federal $ 1,249 $ 2,458 $ 451 $ — $ 4,158 Commercial — 1 130 — 131 State and local government agencies — — 1 — 1 Intersegment 2 4 55 (61) — Sales and service revenues $ 1,251 $ 2,463 $ 637 $ (61) $ 4,290 Contract Type Firm fixed-price $ 31 $ 3 $ 121 $ — $ 155 Fixed-price incentive 1,058 1,131 — — 2,189 Cost-type 160 1,325 246 — 1,731 Time and materials — — 215 — 215 Intersegment 2 4 55 (61) — Sales and service revenues $ 1,251 $ 2,463 $ 637 $ (61) $ 4,290 Three Months Ended Three Months Ended Six Months Ended Six Months Ended ($ in millions) 2021 2020 2021 2020 Major Programs Amphibious assault ships $ 349 $ 328 $ 706 $ 675 Surface combatants and coast guard cutters 325 295 612 574 Other (4) (1) 1 2 Total Ingalls 670 622 1,319 1,251 Aircraft carriers 728 656 1,486 1,354 Submarines 472 286 929 741 Other 163 180 355 368 Total Newport News 1,363 1,122 2,770 2,463 Government and energy services 237 260 482 513 Oil and gas services — 60 14 124 Total Technical Solutions 237 320 496 637 Intersegment eliminations (39) (37) (76) (61) Sales and service revenues $ 2,231 $ 2,027 $ 4,509 $ 4,290 As of June 30, 2021, the Company had $47.7 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 June 30, 2021, net cumulative catch-up adjustments increased operating income and increased diluted earnings per share by $35 million and $0.68, respectively. For the three months ended June 30, 2020, net cumulative catch-up adjustments decreased operating income and decreased diluted earnings per share by $111 million and $2.15, respectively. For the six months ended June 30, 2021, net cumulative catch-up adjustments increased operating income and increased diluted earnings per share by $85 million and $1.66, respectively. For the six months ended June 30, 2020, net cumulative catch-up adjustments decreased operating income and decreased diluted earnings per share by $79 million and $1.53, respectively. Cumulative catch-up adjustments for the three months ended June 30, 2021, included a favorable adjustment of $14 million on a contract at the Company's Ingalls segment, which increased diluted earnings per share by $0.28. Cumulative catch-up adjustments for the three months ended June 30, 2020, included a favorable adjustment of $25 million on a contract at the Company's Ingalls segment, which increased diluted earnings per share by $0.48. For the three and six months ended June 30, 2021, no individual unfavorable adjustment was material to the Company's unaudited condensed consolidated statements of operations and comprehensive income. Cumulative catch-up adjustments for the three and six months ended June 30, 2020, included unfavorable adjustments of $111 million and $120 million, respectively, relating to Block IV of the Virginia class (SSN 774) submarine program at the Company's Newport News segment, which decreased diluted earnings per share by $2.15 and $2.34, respectively. While other unfavorable cumulative catch-up adjustments for the three and six months ended June 30, 2020, were not individually material, cost estimates for discrete delay and disruption from COVID-19 Events drove $61 million of unfavorable cumulative catch-up adjustments across our contracts, including $16 million relating to Block IV of the Virginia class (SSN 774) submarine program, which is included in the $111 million and $120 million unfavorable adjustments discussed above. 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 $58 million from December 31, 2020, to June 30, 2021, primarily resulting from an increase in contract assets due to revenue on certain U.S. Navy contracts. For the three and six months ended June 30, 2021, the Company recognized revenue of $56 million and $453 million, respectively, related to its contract liabilities as of December 31, 2020. For the three months ended June 30, 2020, the Company recognized no revenue related to its contract liabilities as of December 31, 2020. For the six months ended June 30, 2020, the Company recognized revenue of $256 million related to its contract liabilities as of December 31, 2019.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 2021 and 2020: Three Months Ended Six Months Ended ($ in millions) 2021 2020 2021 2020 Sales and Service Revenues Ingalls $ 670 $ 622 $ 1,319 $ 1,251 Newport News 1,363 1,122 2,770 2,463 Technical Solutions 237 320 496 637 Intersegment eliminations (39) (37) (76) (61) Sales and service revenues $ 2,231 $ 2,027 $ 4,509 $ 4,290 Operating Income Ingalls $ 80 $ 55 $ 171 $ 123 Newport News 76 (69) 169 26 Technical Solutions 13 9 20 2 Segment operating income 169 (5) 360 151 Non-segment factors affecting operating income Operating FAS/CAS Adjustment (37) 63 (77) 126 Non-current state income taxes (4) (1) (8) (5) Operating income $ 128 $ 57 $ 275 $ 272 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) June 30, 2021 December 31, 2020 Assets Ingalls $ 1,665 $ 1,612 Newport News 4,201 4,124 Technical Solutions 1,396 1,379 Corporate 870 1,042 Total assets $ 8,132 $ 8,157

Inventoried Costs, Net

Inventoried Costs, Net	6 Months Ended
	Jun. 30, 2021
Inventory Disclosure [Abstract]
Inventoried Costs, Net	INVENTORIED COSTS, NET Inventoried costs were comprised of the following: ($ in millions) June 30, 2021 December 31, 2020 Production costs of contracts in process 1 $ 12 $ 17 Raw material inventory 127 120 Total inventoried costs, net $ 139 $ 137 1 Includes amounts capitalized pursuant to applicable provisions of the FAR and CAS.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 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 June 30, 2021, and December 31, 2020, were $2,906 million. The accumulated goodwill impairment losses for Ingalls as of each of June 30, 2021, and December 31, 2020, were $1,568 million. The accumulated goodwill impairment losses for Newport News as of each of June 30, 2021, and December 31, 2020, were $1,187 million. The accumulated goodwill impairment losses for Technical Solutions as of each of June 30, 2021, and December 31, 2020, were $151 million. For the six months ended June 30, 2021, the carrying amounts of goodwill changed as follows: ($ 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 June 30, 2021 $ 175 $ 721 $ 708 $ 1,604 As of June 30, 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 $15 million for the three months ended June 30, 2021 and 2020, respectively. Aggregate amortization expense was $26 million for each of the six months ended June 30, 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	6 Months Ended
	Jun. 30, 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 June 30, 2021 and 2020, were 19.9% and 18.5%, respectively. For the six months ended June 30, 2021 and 2020, the Company's effective income tax rates on earnings from operations were 17.1% and 19.9%, respectively. The higher effective tax rate for the three months ended June 30, 2021, was primarily attributable to research and development tax credits for prior periods recorded in 2020. The lower effective tax rate for the six months ended June 30, 2021, was primarily attributable to a tax loss associated with the sale of the Company’s oil and gas business. For the three months ended June 30, 2021, the Company’s effective tax rate differed from the federal statutory tax rate primarily as a result of the research and development tax credit. For the six months ended June 30, 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 and six months ended June 30, 2020, the Company’s effective tax rates differed from the federal statutory rate primarily as a result of research and development tax credits for prior periods. The Company's unrecognized tax benefits increased by $2 million during the three months ended June 30, 2021. As of June 30, 2021, the estimated amounts of the Company's unrecognized tax benefits, excluding interest and penalties, were liabilities of $52 million. Assuming a sustainment of these tax positions, the reversal of $37 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 and six months ended June 30, 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	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Debt	DEBT Long-term debt consisted of the following: ($ in millions) June 30, 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 (16) (19) Total long-term debt $ 1,689 $ 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 June 30, 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 June 30, 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 $13 million and $14 million as of June 30, 2021, and December 31, 2020, respectively. 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 six months ended June 30, 2021. The estimated fair values of the Company's total long-term debt as of June 30, 2021, and December 31, 2020, were $1,892 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	6 Months Ended
	Jun. 30, 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. On July 30, 2021, the Vermont court issued its ruling on the reinsurers’ motion for judgment on the pleadings and the Company’s cross motion for judgment on the pleadings. The court granted the reinsurers’ motion, finding that, because the Company continued to operate through the pandemic, the Company’s reduction of business not accompanied by a complete loss of use fell short of the required “direct physical loss or damage to property.” The Company has appealed the decision. Although the Company still 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 six months ended June 30, 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 USS Delbert D. Black (DDG 119) causing damage to USS 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 USS 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 USS Delbert D. Black (DDG 119) or whether the repairs will be paid under the builder's risk insurance included in the USS 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. On July 20, 2021, an agreement was reached with the defendants to resolve the Company’s remaining claims. We expect the settlement to be funded in the third quarter of 2021. 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	6 Months Ended
	Jun. 30, 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 June 30, 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 June 30, 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 June 30, 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 June 30, 2021, the Company had $15 million in issued but undrawn letters of credit, as indicated in Note 12: Debt, and $276 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 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 41,000 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 15 Technical Solutions employees in Klamath Falls, Oregon are covered by a collective bargaining agreement that expires in June 2025. 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	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 2021 and 2020, were as follows: Three Months Ended Six Months Ended Pension Benefits Other Benefits Pension Benefits Other Benefits ($ in millions) 2021 2020 2021 2020 2021 2020 2021 2020 Components of Net Periodic Benefit Cost Service cost $ 49 $ 45 $ 2 $ 3 $ 99 $ 90 $ 5 $ 5 Interest cost 60 65 4 4 120 129 7 8 Expected return on plan assets (138) (122) — — (276) (243) — — Amortization of prior service cost (credit) 4 3 (1) (6) 8 6 (2) (11) Amortization of net actuarial loss (gain) 27 27 — (1) 54 54 (1) (3) Net periodic benefit cost $ 2 $ 18 $ 5 $ — $ 5 $ 36 $ 9 $ (1) The Company made the following contributions to its defined benefit pension plans and other postretirement benefit plans for the six months ended June 30, 2021 and 2020: Six Months Ended ($ in millions) 2021 2020 Pension plans Discretionary Qualified $ 60 $ 65 Non-qualified 4 4 Other benefit plans 20 17 Total contributions $ 84 $ 86 As of June 30, 2021, the Company anticipates no further significant cash contributions to its qualified defined benefit pension plans in 2021.

Stock Compensation Plans

Stock Compensation Plans	6 Months Ended
	Jun. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock Compensation Plans	STOCK COMPENSATION PLANS During the six months ended June 30, 2021 and 2020, the Company issued new stock awards as follows: Restricted Performance Stock Rights - For the six months ended June 30, 2021, the Company granted approximately 0.2 million RPSRs at a weighted average share price of $179.21. These rights are subject to cliff vesting on December 31, 2023. For the six months ended June 30, 2020, the Company granted approximately 0.1 million RPSRs at a weighted average share price of $231.16. These rights are subject to cliff vesting on December 31, 2022. All of the RPSRs are subject to the achievement of performance-based targets at the end of the respective vesting periods and will ultimately vest between 0% and 200% of grant date value. For each of the six months ended June 30, 2021 and 2020, approximately 0.1 million of stock awards vested, of which less than 0.1 million each year were transferred to the Company from employees in satisfaction of minimum tax withholding obligations. The following table summarizes the status of the Company's outstanding stock awards as of June 30, 2021: Stock Awards Weighted-Average Weighted-Average Remaining Contractual Term Total stock awards 462 $ 190.39 1.4 Compensation Expense The Company recorded stock-based compensation for the value of awards granted to Company employees and non-employee members of the board of directors for the three months ended June 30, 2021 and 2020, of $3 million and $6 million, respectively. The Company recorded stock-based compensation for the value of awards granted to Company employees and non-employee members of the board of directors for the six months ended June 30, 2021 and 2020, of $12 million and $13 million, respectively. The Company recorded tax benefits related to stock awards of less than $1 million and $1 million for the three months ended June 30, 2021 and 2020, respectively. The Company recorded tax benefits related to stock awards of $2 million for each of the six months ended June 30, 2021 and 2020, respectively. The Company recognized tax benefits associated with the issuance of stock in settlement of stock awards of less than $1 million and $1 million for the three months ended June 30, 2021 and 2020, respectively. The Company recognized tax benefits associated with the issuance of stock in settlement of stock awards of $2 million and $3 million for the six months ended June 30, 2021 and 2020, respectively. Unrecognized Compensation Expense As of June 30, 2021, the Company had less than $1 million of unrecognized compensation expense associated with Restricted Stock Rights granted in 2021, 2020, and 2019, which will be recognized over a weighted average period of 0.9 years, and $42 million of unrecognized compensation expense associated with RPSRs granted in 2021, 2020, and 2019, which will be recognized over a weighted average period of 1.6 years.

Subsidiary Guarantors

Subsidiary Guarantors	6 Months Ended
	Jun. 30, 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 June 30, 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.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS On July 4, 2021, the Company entered into a Stock Purchase Agreement to acquire Alion Science and Technology (“Alion”) for $1.65 billion in cash, subject to customary adjustments. Alion is a high value, technology-driven solutions provider for the global defense marketplace. The transaction is expected to close in the second half of 2021, subject to customary closing conditions. On August 2, 2021, the Company entered into a $400 million 364-day delayed draw term loan and a $650 million 3-year delayed draw term loan to finance a portion of the purchase price for Alion. Commitments under the 364-day facility, but not the 3-year facility, are subject to mandatory reduction upon the occurrence of certain events specified in the term loan credit agreement, including certain debt and equity issuances. Neither term loan requires principal amortization payments and each must be repaid prior to or at maturity, which is 364 days and 36 months, respectively, from the date of the initial draw. Each term loan has a variable interest rate on outstanding borrowings based on the London Interbank Offered Rate ("LIBOR"), plus a spread based upon the Company's credit rating, which may vary between 1.125% and 2.000%. The current interest rate on drawn amounts would be 1.375% based on the Company's current credit rating. The term loans also have a commitment fee rate on unutilized amounts, currently 0.20%, which will begin accruing on September 2, 2021. On August 2, 2021, the Company also amended and restated its existing $1.25 billion Credit Facility, increasing the capacity thereunder to $1.5 billion and extending the maturity date to five years from signing. The amended and restated revolving credit facility has a variable interest rate on outstanding borrowings based on LIBOR, plus a spread based upon the Company's credit rating, which may vary between 1.125% and 2.000%. The current interest on drawn amounts would be 1.375% based on the Company's current credit rating. The amended and restated revolving credit facility also has a commitment fee rate on unutilized amounts, currently 0.20%.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 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 six months ended June 30, 2021, the Company recognized cash grant benefits of approximately $2 million in other long-term liabilities in the unaudited condensed consolidated statements of financial position. For the six months ended June 30, 2020, the Company recognized cash grant benefits of approximately $9 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 was carried at amortized cost of $35 million, net of $14 million of loan discount as of June 30, 2021, and at amortized cost of $34 million, net of $15 million of loan discount as of December 31, 2020, which approximates fair value. The loan receivable 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 $447 million as of June 30, 2021, and $462 million as of December 31, 2020. Payroll taxes payable, which is a component of other current liabilities, was $132 million as of June 30, 2021, and $125 million as of December 31, 2020. No other component of other current liabilities was more than 5% of total current liabilities.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 2021 and 2020, were as follows: ($ in millions) Benefit Plans Other Total Balance as of March 31, 2020 $ (1,390) $ (4) $ (1,394) Other comprehensive income before reclassifications — 1 1 Amounts reclassified from accumulated other comprehensive loss Amortization of prior service credit 1 (3) — (3) Amortization of net actuarial loss 1 26 — 26 Tax expense for items of other comprehensive income (6) — (6) Net current period other comprehensive income 17 1 18 Balance as of June 30, 2020 $ (1,373) $ (3) $ (1,376) Balance as of March 31, 2021 $ (1,524) $ 1 $ (1,523) Other comprehensive income before reclassifications — — — Amounts reclassified from accumulated other comprehensive loss Amortization of prior service cost 1 3 — 3 Amortization of net actuarial loss 1 27 — 27 Tax expense for items of other comprehensive income (8) — (8) Net current period other comprehensive income 22 — 22 Balance as of June 30, 2021 $ (1,502) $ 1 $ (1,501) ($ in millions) Benefit Plans Other Total Balance as of December 31, 2019 $ (1,407) $ (2) $ (1,409) Other comprehensive loss before reclassifications — (1) (1) Amounts reclassified from accumulated other comprehensive loss Amortization of prior service credit 1 (5) — (5) Amortization of net actuarial loss 1 51 — 51 Tax expense for items of other comprehensive income (12) — (12) Net current period other comprehensive income (loss) 34 (1) 33 Balance as of June 30, 2020 $ (1,373) $ (3) $ (1,376) 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 6 — 6 Amortization of net actuarial loss 1 53 — 53 Tax expense for items of other comprehensive income (15) — (15) Net current period other comprehensive income 44 2 46 Balance as of June 30, 2021 $ (1,502) $ 1 $ (1,501)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 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 Six Months Ended (in millions, except per share amounts) 2021 2020 2021 2020 Net earnings $ 129 $ 53 $ 277 $ 225 Weighted-average common shares outstanding 40.3 40.7 40.3 40.6 Net dilutive effect of stock awards — — — — Dilutive weighted-average common shares outstanding 40.3 40.7 40.3 40.6 Earnings per share - basic $ 3.20 $ 1.30 $ 6.87 $ 5.54 Earnings per share - diluted $ 3.20 $ 1.30 $ 6.87 $ 5.54

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2021 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 624 $ 1,111 $ 28 $ — $ 1,763 Service revenues 41 248 179 — 468 Intersegment 5 4 30 (39) — Sales and service revenues $ 670 $ 1,363 $ 237 $ (39) $ 2,231 Customer Type Federal $ 665 $ 1,359 $ 200 $ — $ 2,224 Commercial — — 7 — 7 Intersegment 5 4 30 (39) — Sales and service revenues $ 670 $ 1,363 $ 237 $ (39) $ 2,231 Contract Type Firm fixed-price $ 13 $ 7 $ 41 $ — $ 61 Fixed-price incentive 610 713 — — 1,323 Cost-type 42 639 111 — 792 Time and materials — — 55 — 55 Intersegment 5 4 30 (39) — Sales and service revenues $ 670 $ 1,363 $ 237 $ (39) $ 2,231 Three Months Ended June 30, 2020 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 564 $ 826 $ 30 $ — $ 1,420 Service revenues 57 294 256 — 607 Intersegment 1 2 34 (37) — Sales and service revenues $ 622 $ 1,122 $ 320 $ (37) $ 2,027 Customer Type Federal $ 621 $ 1,119 $ 223 $ — $ 1,963 Commercial — 1 62 — 63 State and local government agencies — — 1 — 1 Intersegment 1 2 34 (37) — Sales and service revenues $ 622 $ 1,122 $ 320 $ (37) $ 2,027 Contract Type Firm fixed-price $ 16 $ 1 $ 62 $ — $ 79 Fixed-price incentive 535 493 — — 1,028 Cost-type 70 626 113 — 809 Time and materials — — 111 — 111 Intersegment 1 2 34 (37) — Sales and service revenues $ 622 $ 1,122 $ 320 $ (37) $ 2,027 Six Months Ended June 30, 2021 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 1,228 $ 2,212 $ 44 $ — $ 3,484 Service revenues 83 552 390 — 1,025 Intersegment 8 6 62 (76) — Sales and service revenues $ 1,319 $ 2,770 $ 496 $ (76) $ 4,509 Customer Type Federal $ 1,311 $ 2,764 $ 406 $ — $ 4,481 Commercial — — 28 — 28 Intersegment 8 6 62 (76) — Sales and service revenues $ 1,319 $ 2,770 $ 496 $ (76) $ 4,509 Contract Type Firm fixed-price $ 24 $ 15 $ 80 $ — $ 119 Fixed-price incentive 1,205 1,435 3 — 2,643 Cost-type 82 1,314 231 — 1,627 Time and materials — — 120 — 120 Intersegment 8 6 62 (76) — Sales and service revenues $ 1,319 $ 2,770 $ 496 $ (76) $ 4,509 Six Months Ended June 30, 2020 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 1,142 $ 1,872 $ 30 $ — $ 3,044 Service revenues 107 587 552 — 1,246 Intersegment 2 4 55 (61) — Sales and service revenues $ 1,251 $ 2,463 $ 637 $ (61) $ 4,290 Customer Type Federal $ 1,249 $ 2,458 $ 451 $ — $ 4,158 Commercial — 1 130 — 131 State and local government agencies — — 1 — 1 Intersegment 2 4 55 (61) — Sales and service revenues $ 1,251 $ 2,463 $ 637 $ (61) $ 4,290 Contract Type Firm fixed-price $ 31 $ 3 $ 121 $ — $ 155 Fixed-price incentive 1,058 1,131 — — 2,189 Cost-type 160 1,325 246 — 1,731 Time and materials — — 215 — 215 Intersegment 2 4 55 (61) — Sales and service revenues $ 1,251 $ 2,463 $ 637 $ (61) $ 4,290 Three Months Ended Three Months Ended Six Months Ended Six Months Ended ($ in millions) 2021 2020 2021 2020 Major Programs Amphibious assault ships $ 349 $ 328 $ 706 $ 675 Surface combatants and coast guard cutters 325 295 612 574 Other (4) (1) 1 2 Total Ingalls 670 622 1,319 1,251 Aircraft carriers 728 656 1,486 1,354 Submarines 472 286 929 741 Other 163 180 355 368 Total Newport News 1,363 1,122 2,770 2,463 Government and energy services 237 260 482 513 Oil and gas services — 60 14 124 Total Technical Solutions 237 320 496 637 Intersegment eliminations (39) (37) (76) (61) Sales and service revenues $ 2,231 $ 2,027 $ 4,509 $ 4,290

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Segment operating results	The following table presents segment results for the three and six months ended June 30, 2021 and 2020: Three Months Ended Six Months Ended ($ in millions) 2021 2020 2021 2020 Sales and Service Revenues Ingalls $ 670 $ 622 $ 1,319 $ 1,251 Newport News 1,363 1,122 2,770 2,463 Technical Solutions 237 320 496 637 Intersegment eliminations (39) (37) (76) (61) Sales and service revenues $ 2,231 $ 2,027 $ 4,509 $ 4,290 Operating Income Ingalls $ 80 $ 55 $ 171 $ 123 Newport News 76 (69) 169 26 Technical Solutions 13 9 20 2 Segment operating income 169 (5) 360 151 Non-segment factors affecting operating income Operating FAS/CAS Adjustment (37) 63 (77) 126 Non-current state income taxes (4) (1) (8) (5) Operating income $ 128 $ 57 $ 275 $ 272
Segment assets	The following table presents the Company's assets by segment: ($ in millions) June 30, 2021 December 31, 2020 Assets Ingalls $ 1,665 $ 1,612 Newport News 4,201 4,124 Technical Solutions 1,396 1,379 Corporate 870 1,042 Total assets $ 8,132 $ 8,157

Inventoried Costs, Net (Tables)

Inventoried Costs, Net (Tables)	6 Months Ended
	Jun. 30, 2021
Inventory Disclosure [Abstract]
Inventoried costs, net	Inventoried costs were comprised of the following: ($ in millions) June 30, 2021 December 31, 2020 Production costs of contracts in process 1 $ 12 $ 17 Raw material inventory 127 120 Total inventoried costs, net $ 139 $ 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)	6 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	For the six months ended June 30, 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 June 30, 2021 $ 175 $ 721 $ 708 $ 1,604

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consisted of the following: ($ in millions) June 30, 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 (16) (19) Total long-term debt $ 1,689 $ 1,686

Employee Pension and Other Po_2

Employee Pension and Other Postretirement Benefits (Tables)	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 2021 and 2020, were as follows: Three Months Ended Six Months Ended Pension Benefits Other Benefits Pension Benefits Other Benefits ($ in millions) 2021 2020 2021 2020 2021 2020 2021 2020 Components of Net Periodic Benefit Cost Service cost $ 49 $ 45 $ 2 $ 3 $ 99 $ 90 $ 5 $ 5 Interest cost 60 65 4 4 120 129 7 8 Expected return on plan assets (138) (122) — — (276) (243) — — Amortization of prior service cost (credit) 4 3 (1) (6) 8 6 (2) (11) Amortization of net actuarial loss (gain) 27 27 — (1) 54 54 (1) (3) Net periodic benefit cost $ 2 $ 18 $ 5 $ — $ 5 $ 36 $ 9 $ (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 six months ended June 30, 2021 and 2020: Six Months Ended ($ in millions) 2021 2020 Pension plans Discretionary Qualified $ 60 $ 65 Non-qualified 4 4 Other benefit plans 20 17 Total contributions $ 84 $ 86

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2021: Stock Awards Weighted-Average Weighted-Average Remaining Contractual Term Total stock awards 462 $ 190.39 1.4

Description of Business (Narrat

Description of Business (Narrative) (Details)	6 Months Ended
	Jun. 30, 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	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred gain on receipt of property	$ 2	$ 9
Assets held in rabbi trusts	203		$ 182
Financing Receivable, after Allowance for Credit Loss	35		34
Receivable with Imputed Interest, Discount	14		15
Other current liabilities	447		462
Accrued Payroll Taxes	$ 132		$ 125
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		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 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			(22)
Proceeds from disposition of business			20
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		13
San Diego Shipyard
Business Acquisition and Divestitures [Line Items]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	83		83
Investment in affiliates			(22)
Oil and gas services
Business Acquisition and Divestitures [Line Items]
Proceeds from disposition of business			25
Gain on disposition of business	$ (2)	$ 3	$ 1

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 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			386,463	390,904
Treasury stock activity	$ 20		$ 70	$ 84
Dividends declared per share	$ 1.14	$ 1.03	$ 2.28	$ 2.06
Dividends paid			$ 92	$ 84
Accumulated other comprehensive income (loss)	$ (1,501)	$ (1,376)	(1,501)	(1,376)	$ (1,523)	$ (1,547)	$ (1,394)	$ (1,409)
Benefit Plans
Stockholders' Equity [Line Items]
Accumulated other comprehensive income (loss)	(1,502)	(1,373)	(1,502)	(1,373)	(1,524)	(1,546)	(1,390)	(1,407)
Other
Stockholders' Equity [Line Items]
Accumulated other comprehensive income (loss)	$ 1	$ (3)	$ 1	$ (3)	$ 1	$ (1)	$ (4)	$ (2)

Stockholders' Equity Accumulate

Stockholders' Equity Accumulated Other Comprehensive Income (Loss) (Table) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning		$ (1,523)	$ (1,394)	$ (1,547)	$ (1,409)
Other comprehensive income (loss) before reclassifications			1	2	(1)
Amortization of prior service cost (credit)	[1]	3	(3)	6	(5)
Amortization of net actuarial loss (gain)	[1]	27	26	53	51
Tax benefit (expense) for items of other comprehensive income		(8)	(6)	(15)	(12)
Other comprehensive income (loss), net of tax		22	18	46	33
Balance, ending		(1,501)	(1,376)	(1,501)	(1,376)
Income tax expense (benefit)		32	12	57	56
Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning		(1,524)	(1,390)	(1,546)	(1,407)
Amortization of prior service cost (credit)	[1]	3	(3)	6	(5)
Amortization of net actuarial loss (gain)	[1]	27	26	53	51
Tax benefit (expense) for items of other comprehensive income		(8)	(6)	(15)	(12)
Other comprehensive income (loss), net of tax		22	17	44	34
Balance, ending		(1,502)	(1,373)	(1,502)	(1,373)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning		1	(4)	(1)	(2)
Other comprehensive income (loss) before reclassifications			1	2	(1)
Other comprehensive income (loss), net of tax			1	2	(1)
Balance, ending		1	(3)	1	(3)
Reclassification out of AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)		$ 8	$ 6	$ 15	$ 12
[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 June 30, 2021 and 2020, was $8 million and $6 million, respectively. The tax benefit associated with amounts reclassified from accumulated other comprehensive loss for the six months ended June 30, 2021 and 2020, was $15 million and $12 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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share, Basic and Diluted [Abstract]
Net earnings (loss)	$ 129	$ 53	$ 277	$ 225
Weighted-average common shares outstanding (in shares)	40.3	40.7	40.3	40.6
Dilutive weighted-average common shares outstanding (in shares)	40.3	40.7	40.3	40.6
Earnings (loss) per share - basic (in dollars per share)	$ 3.20	$ 1.30	$ 6.87	$ 5.54
Earnings (loss) per share - diluted (in dollars per share)	$ 3.20	$ 1.30	$ 6.87	$ 5.54

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 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	0.4	0.3

Revenue (Table) (Details)

Revenue (Table) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Sales and service revenues	$ 2,231	$ 2,027	$ 4,509	$ 4,290
Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	61	79	119	155
Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,323	1,028	2,643	2,189
Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	792	809	1,627	1,731
Time-and-materials
Disaggregation of Revenue [Line Items]
Sales and service revenues	55	111	120	215
Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	2,224	1,963	4,481	4,158
Commercial
Disaggregation of Revenue [Line Items]
Sales and service revenues	7	63	28	131
State and local government agencies
Disaggregation of Revenue [Line Items]
Sales and service revenues		1		1
Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,763	1,420	3,484	3,044
Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	468	607	1,025	1,246
Ingalls
Disaggregation of Revenue [Line Items]
Sales and service revenues	670	622	1,319	1,251
Intersegment	5	1	8	2
Ingalls | Amphibious assault ships
Disaggregation of Revenue [Line Items]
Sales and service revenues	349	328	706	675
Ingalls | Surface combatants and coast guard cutters
Disaggregation of Revenue [Line Items]
Sales and service revenues	325	295	612	574
Ingalls | Other programs
Disaggregation of Revenue [Line Items]
Sales and service revenues	(4)	(1)	1	2
Ingalls | Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	13	16	24	31
Ingalls | Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	610	535	1,205	1,058
Ingalls | Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	42	70	82	160
Ingalls | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	5	1	8	2
Ingalls | Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	665	621	1,311	1,249
Ingalls | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	5	1	8	2
Ingalls | Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	624	564	1,228	1,142
Ingalls | Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	41	57	83	107
Newport News
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,363	1,122	2,770	2,463
Intersegment	4	2	6	4
Newport News | Aircraft carriers
Disaggregation of Revenue [Line Items]
Sales and service revenues	728	656	1,486	1,354
Newport News | Submarines
Disaggregation of Revenue [Line Items]
Sales and service revenues	472	286	929	741
Newport News | Other programs
Disaggregation of Revenue [Line Items]
Sales and service revenues	163	180	355	368
Newport News | Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	7	1	15	3
Newport News | Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	713	493	1,435	1,131
Newport News | Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	639	626	1,314	1,325
Newport News | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	4	2	6	4
Newport News | Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,359	1,119	2,764	2,458
Newport News | Commercial
Disaggregation of Revenue [Line Items]
Sales and service revenues		1		1
Newport News | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	4	2	6	4
Newport News | Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,111	826	2,212	1,872
Newport News | Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	248	294	552	587
Technical Solutions
Disaggregation of Revenue [Line Items]
Sales and service revenues	237	320	496	637
Intersegment	30	34	62	55
Technical Solutions | Government and energy services
Disaggregation of Revenue [Line Items]
Sales and service revenues	237	260	482	513
Technical Solutions | Oil and gas services
Disaggregation of Revenue [Line Items]
Sales and service revenues		60	14	124
Technical Solutions | Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	41	62	80	121
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	111	113	231	246
Technical Solutions | Time-and-materials
Disaggregation of Revenue [Line Items]
Sales and service revenues	55	111	120	215
Technical Solutions | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	30	34	62	55
Technical Solutions | Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	200	223	406	451
Technical Solutions | Commercial
Disaggregation of Revenue [Line Items]
Sales and service revenues	7	62	28	130
Technical Solutions | State and local government agencies
Disaggregation of Revenue [Line Items]
Sales and service revenues		1		1
Technical Solutions | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	30	34	62	55
Technical Solutions | Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	28	30	44	30
Technical Solutions | Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	179	256	390	552
Intersegment Elimination
Disaggregation of Revenue [Line Items]
Sales and service revenues	(39)	(37)	(76)	(61)
Intersegment	(39)	(37)	(76)	(61)
Intersegment Elimination | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	(39)	(37)	(76)	(61)
Intersegment Elimination | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	$ (39)	$ (37)	$ (76)	$ (61)

Revenue (Narrative) (Details)

Revenue (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 47,700		$ 47,700
Revenue, performance obligation, recognition percentage, year two			30.00%
Revenue, performance obligation, recognition percentage, year four			30.00%
Increase (Decrease) in Net Contract Assets			$ 58
Contract with Customer, Liability, Revenue Recognized	56		453	$ 256
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate
Increase (decrease) in operating income due to net cumulative catch-up adjustments	$ 35	$ (111)	$ 85	$ (79)
Increase (decrease) in diluted earnings per share due to net cumulative catch-up adjustments	$ 0.68	$ (2.15)	$ 1.66	$ (1.53)
COVID-19 Events [Member]
Change in Accounting Estimate
Increase (decrease) in operating income due to net cumulative catch-up adjustments		$ 61		$ 61
NNS Block IV Virginia Class (SSN 774) [Member] | Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate
Increase (decrease) in operating income due to net cumulative catch-up adjustments		$ (111)		$ (120)
Increase (decrease) in diluted earnings per share due to net cumulative catch-up adjustments		$ (2.15)		$ (2.34)
NNS Block IV Virginia Class (SSN 774) [Member] | COVID-19 Events [Member]
Change in Accounting Estimate
Increase (decrease) in operating income due to net cumulative catch-up adjustments		$ 16		$ 16
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	$ 14	$ 25
Increase (decrease) in diluted earnings per share due to net cumulative catch-up adjustments	$ 0.28	$ 0.48

Segment Information (Narrative)

Segment Information (Narrative) (Details)	6 Months Ended
	Jun. 30, 2021segments
Segment Reporting [Abstract]
Number of reportable segments	3

Segment Operating Results (Tabl

Segment Operating Results (Table) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Sales and Service Revenues
Sales and service revenue	$ 2,231	$ 2,027	$ 4,509	$ 4,290
Operating Income (Loss)
Operating income (loss)	128	57	275	272
Operating Segments
Operating Income (Loss)
Operating income (loss)	169	(5)	360	151
Ingalls
Sales and Service Revenues
Sales and service revenue	670	622	1,319	1,251
Operating Income (Loss)
Operating income (loss)	80	55	171	123
Newport News
Sales and Service Revenues
Sales and service revenue	1,363	1,122	2,770	2,463
Operating Income (Loss)
Operating income (loss)	76	(69)	169	26
Technical Solutions
Sales and Service Revenues
Sales and service revenue	237	320	496	637
Operating Income (Loss)
Operating income (loss)	13	9	20	2
Intersegment Elimination
Sales and Service Revenues
Sales and service revenue	(39)	(37)	(76)	(61)
Non-segment factors affecting operating income (loss)
Non-segment factors affecting operating income (loss)
Operating FAS/CAS Adjustment	(37)	63	(77)	126
Non-current state income taxes	$ (4)	$ (1)	$ (8)	$ (5)

Segment Assets (Table) (Details

Segment Assets (Table) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Segment Reporting Information
Assets	$ 8,132	$ 8,157
Ingalls
Segment Reporting Information
Assets	1,665	1,612
Newport News
Segment Reporting Information
Assets	4,201	4,124
Technical Solutions
Segment Reporting Information
Assets	1,396	1,379
Corporate
Segment Reporting Information
Assets	$ 870	$ 1,042

Inventoried Costs, Net (Table)

Inventoried Costs, Net (Table) (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Inventoried costs	[1]	$ 12	$ 17
Raw material inventory		127	120
Total inventoried costs, net		$ 139	$ 137
[1]	Includes amounts capitalized pursuant to applicable provisions of the FAR and CAS.

Goodwill (Narrative) (Details)

Goodwill (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 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	6 Months Ended
	Jun. 30, 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		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Aggregate weighted-average amortization period			40 years
Amortization of purchased intangibles	$ 13	$ 15	$ 26	$ 26
Expected amortization for purchased intangible assets:
Expected amortization, 2021	52		52
Expected amortization, 2022	46		46
Expected amortization, 2023	37		37
Expected amortization, 2024	28		28
Expected amortization, 2025	28		$ 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		$ 13

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Contingency [Line Items]
Effective income tax rate	19.90%	18.50%	17.10%	19.90%
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 2
Unrecognized Tax Benefits	52		$ 52
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	37		37
Maximum
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 1		$ 1

Schedule of Long-term debt (Tab

Schedule of Long-term debt (Table) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 1,689	$ 1,686
Less unamortized debt issuance costs	(16)	(19)
Senior Notes
Debt Instrument [Line Items]
Less unamortized debt issuance costs	(13)	(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	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Credit Facility
Long-term Debt	$ 1,689	$ 1,689	$ 1,686
Unamortized Debt Issuance Expense	16	16	19
Revolving Credit Facility
Credit Facility
Credit facility revolver	1,250	$ 1,250
Debt Instrument, Contractual Term		5 years
Letters of credit issued but undrawn	15	$ 15
Line of Credit Facility, Remaining Borrowing Capacity	1,235	1,235
Unamortized Debt Issuance Expense	3	3	$ 5
Revolving Credit Facility | Subsequent Event [Member]
Credit Facility
Credit facility revolver	$ 1,500	1,500
Commitment fee, based on unused capacity	0.20%
Revolving Credit Facility | Letter of Credit
Credit Facility
Credit facility revolver	$ 500	$ 500
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member]
Credit Facility
Spread on variable rate	1.375%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) [Member] | Minimum | Subsequent Event [Member]
Credit Facility
Spread on variable rate	1.125%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) [Member] | Maximum | Subsequent Event [Member]
Credit Facility
Spread on variable rate	2.00%

Debt Commercial Paper (Narrativ

Debt Commercial Paper (Narrative) (Details) $ in Billions	Jun. 30, 2021USD ($)
Maximum
Short-term Debt [Line Items]
Commercial Paper	$ 1

Debt Senior Note (Narrative) (D

Debt Senior Note (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term Debt	$ 1,689	$ 1,686
Unamortized Debt Issuance Expense	16	19
Senior Notes
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ 13	$ 14

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Fair value of long term debt	$ 1,892	$ 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	6 Months Ended
	Jun. 30, 2021USD ($)frigatesnumberOfReinsurers
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	6 Months Ended
	Jun. 30, 2021USD ($)
Commitments and Contingencies
Entity Number of Employees	41,000
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	276
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	15
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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pension Benefits
Defined Benefit Plan Disclosure
Service cost	$ 49	$ 45	$ 99	$ 90
Interest cost	60	65	120	129
Expected return on plan assets	(138)	(122)	(276)	(243)
Amortization of prior service cost (credit)	4	3	8	6
Amortization of net actuarial loss (gain)	27	27	54	54
Net periodic benefit cost	2	18	5	36
Other Benefits
Defined Benefit Plan Disclosure
Service cost	2	3	5	5
Interest cost	4	4	7	8
Amortization of prior service cost (credit)	(1)	(6)	(2)	(11)
Amortization of net actuarial loss (gain)		$ (1)	(1)	(3)
Net periodic benefit cost	$ 5		$ 9	$ (1)

Employee Pension and Other Po_4

Employee Pension and Other Postretirement Benefits Cash Contributions (Table) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure
Other benefit plans	$ 20	$ 17
Total contributions	84	86
Discretionary Contribution | Qualified
Defined Benefit Plan Disclosure
Pension contributions	60	65
Discretionary Contribution | Non-qualified
Defined Benefit Plan Disclosure
Pension contributions	$ 4	$ 4

Stock Compensation Plans (Narra

Stock Compensation Plans (Narrative) (Details) - $ / shares shares in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Stock awards
Stock rights, weighted-average grant date fair value	$ 190.39
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	$ 179.21	$ 231.16
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	6 Months Ended
	Jun. 30, 2021$ / sharesshares
Stock awards
Stock awards, outstanding | shares	462
Stock awards, weighted-average grant date fair value | $ / shares	$ 190.39
Stock awards, weighted-average remaining contractual term	1 year 4 months 24 days

Stock Compensation Plans Compen

Stock Compensation Plans Compensation and Unrecognized Compensation Expense (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Compensation Expense [Abstract]
Share-based Payment Arrangement, Expense	$ 3	$ 6	$ 12	$ 13
Tax benefits for stock-based compensation		1	2	2
Stock Awards [Member]
Compensation Expense [Abstract]
Employee Service Share-Based Compensation, Tax Benefit Realized From Issuance Of Instruments Other Than Options		$ 1	$ 2	$ 3
Restricted Stock [Member]
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation expense, period for recognition			10 months 24 days
Restricted performance stock rights
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation expense	42		$ 42
Unrecognized compensation expense, period for recognition			1 year 7 months 6 days
Maximum
Compensation Expense [Abstract]
Tax benefits for stock-based compensation	1
Maximum | Stock Awards [Member]
Compensation Expense [Abstract]
Employee Service Share-Based Compensation, Tax Benefit Realized From Issuance Of Instruments Other Than Options	1
Maximum | Restricted Stock [Member]
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation expense	$ 1		$ 1

Subsidiary Guarantors Narrative

Subsidiary Guarantors Narrative (Details)	6 Months Ended
	Jun. 30, 2021
Subsidiary Guarantors [Abstract]
Parent ownership percentage of subsidiary guarantors	100.00%

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Subsequent Event [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		$ 378
Long-term Debt	$ 1,689		$ 1,686
Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Credit facility revolver	$ 1,250
Subsequent Event [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Commitment fee, based on unused capacity	0.20%
Credit facility revolver	$ 1,500
Subsequent Event [Member] | Term Loan
Subsequent Event [Line Items]
Long-term Debt	$ 650
Long-term Debt, Term	36 months
Commitment fee, based on unused capacity	0.20%
Subsequent Event [Member] | 364-Day Term Loan
Subsequent Event [Line Items]
Short-term debt and current portion of long-term debt	$ 400
Short Term Debt, Term	364 days
Commitment fee, based on unused capacity	0.20%
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Spread on variable rate	1.375%
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan
Subsequent Event [Line Items]
Spread on variable rate	1.375%
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | 364-Day Term Loan
Subsequent Event [Line Items]
Spread on variable rate	1.375%
Subsequent Event [Member] | Minimum | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Spread on variable rate	1.125%
Subsequent Event [Member] | Minimum | London Interbank Offered Rate (LIBOR) [Member] | Term Loan
Subsequent Event [Line Items]
Spread on variable rate	1.125%
Subsequent Event [Member] | Minimum | London Interbank Offered Rate (LIBOR) [Member] | 364-Day Term Loan
Subsequent Event [Line Items]
Spread on variable rate	1.125%
Subsequent Event [Member] | Maximum | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Spread on variable rate	2.00%
Subsequent Event [Member] | Maximum | London Interbank Offered Rate (LIBOR) [Member] | Term Loan
Subsequent Event [Line Items]
Spread on variable rate	2.00%
Subsequent Event [Member] | Maximum | London Interbank Offered Rate (LIBOR) [Member] | 364-Day Term Loan
Subsequent Event [Line Items]
Spread on variable rate	2.00%
Alion Science and Technology | Subsequent Event [Member]
Subsequent Event [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 1,650