Huntington Ingalls Industries (HII) 10-Q 2 Aug 18 2018 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 27, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2,018
Entity Registrant Name	HUNTINGTON INGALLS INDUSTRIES, INC.
Entity Central Index Key	1,501,585
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		43,318,382

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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Sales and service revenues
Product sales	$ 1,499	$ 1,397	$ 2,869	$ 2,697
Service revenues	521	461	1,025	885
Sales and service revenues	2,020	1,858	3,894	3,582
Cost of sales and service revenues
Cost of product sales	1,147	1,061	2,210	2,088
Cost of service revenues	421	375	853	728
Income (loss) from operating investments, net	2	1	4	3
Other income and gains	12		14
General and administrative expenses	209	182	401	360
Operating income (loss)	257	241	448	409
Other income (expense)
Interest expense	(15)	(17)	(30)	(35)
Non-operating retirement expense	19	(4)	37	(8)
Other, net	1	(2)	2	(1)
Earnings (loss) before income taxes	262	218	457	365
Federal and foreign income taxes	23	71	62	99
Net earnings (loss)	$ 239	$ 147	$ 395	$ 266
Basic earnings (loss) per share (in dollars per share)	$ 5.41	$ 3.22	$ 8.88	$ 5.78
Weighted-average common shares outstanding (in shares)	44.2	45.7	44.5	46
Diluted earnings (loss) per share	$ 5.40	$ 3.21	$ 8.86	$ 5.77
Weighted-average diluted shares outstanding (in shares)	44.3	45.8	44.6	46.1
Dividends declared per share	$ 0.72	$ 0.60	$ 1.44	$ 1.20
Other comprehensive income (loss)
Change in unamortized benefit plan costs	$ 21	$ 23	$ 41	$ 45
Other	(2)	3	(2)	7
Tax benefit (expense) for items of other comprehensive income	(6)	(10)	(11)	(20)
Other comprehensive income (loss), net of tax	13	16	28	32
Comprehensive income (loss)	$ 252	$ 163	$ 423	$ 298

Condensed Consolidated Stateme3

Condensed Consolidated Statements Of Financial Position (Unaudited) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 398	$ 701
Accounts receivable, net	364	429
Contract assets	1,078	759
Inventoried costs, net	174	183
Prepaid expenses and other current assets	138	123
Total current assets	2,152	2,195
Property, plant, and equipment, net	2,258	2,215
Goodwill	1,217	1,217
Other intangible assets, net	490	508
Deferred tax assets	92	114
Miscellaneous other assets	166	125
Total assets	6,375	6,374
Current Liabilities
Trade accounts payable	378	375
Accrued employees' compensation	252	245
Current portion of postretirement plan liabilities	139	139
Current portion of workers' compensation liabilities	253	250
Contract liabilities	210	146
Other current liabilities	277	236
Total current liabilities	1,509	1,391
Long-term debt	1,281	1,279
Pension plan liabilities	836	922
Other postretirement plan liabilities	414	414
Workers' compensation liabilities	506	509
Other long-term liabilities	130	101
Total liabilities	4,676	4,616
Commitments and Contingencies (Note 15)
Stockholders' Equity
Common stock	1	1
Additional paid-in capital	1,932	1,942
Retained earnings (deficit)	2,236	1,687
Treasury stock	(1,385)	(972)
Accumulated other comprehensive income (loss)	(1,085)	(900)
Total stockholders' equity	1,699	1,758
Total liabilities and stockholders' equity	$ 6,375	$ 6,374

Condensed Consolidated Stateme4

Condensed Consolidated Statements Of Financial Position (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 13	$ 13
Accumulated depreciation	1,775	1,770
Accumulated amortization	$ 546	$ 528
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)	53,100,000	53,000,000
Common stock, shares outstanding (in shares)	43,500,000	45,100,000

Condensed Consolidated Stateme5

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net earnings (loss)	$ 395	$ 266
Adjustments to reconcile to net cash provided by (used in) operating activities
Depreciation	85	82
Amortization of purchased intangibles	18	20
Amortization of debt issuance costs	2	3
Provision for doubtful accounts		22
Stock-based compensation	15	20
Deferred income taxes	11	28
Change in
Contract balances	(184)	(132)
Inventoried costs	9	5
Prepaid expenses and other assets	(17)	(1)
Accounts payable and accruals	78	(2)
Retiree benefits	(56)	(27)
Other non-cash transactions, net	3
Net cash provided by (used in) operating activities	359	284
Investing Activities
Capital expenditure additions	(177)	(137)
Grant proceeds for capital expenditures	19
Acquisitions of businesses, net of cash received		3
Investment in affiliates	(10)
Proceeds from disposition of assets	3	1
Net cash provided by (used in) investing activities	(165)	(133)
Financing Activities
Dividends paid	(64)	(55)
Repurchases of common stock	(408)	(207)
Employee taxes on certain share-based payment arrangements	(25)	(56)
Net cash provided by (used in) financing activities	(497)	(318)
Change in cash and cash equivalents	(303)	(167)
Cash and cash equivalents, beginning of period	701	720
Cash and cash equivalents, end of period	398	553
Supplemental Cash Flow Disclosure
Cash paid for income taxes	21	100
Cash paid for interest	31	36
Non-Cash Investing and Financing Activities
Capital expenditures accrued in accounts payable	$ 7	$ 3

Condensed Consolidated Stateme6

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, 2016	$ 1,653	$ 1	$ 1,964	$ 1,323	$ (684)	$ (951)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	266			266
Dividends declared	(55)			(55)
Additional paid-in capital	(36)		(36)
Other comprehensive income (loss), net of tax	32					32
Treasury stock activity	(210)				(210)
Balance at Jun. 30, 2017	1,650	1	1,928	1,534	(894)	(919)
Balance at Dec. 31, 2017	1,758	1	1,942	1,687	(972)	(900)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	395			395
Dividends declared	(64)			(64)
Additional paid-in capital	(10)		(10)
Other comprehensive income (loss), net of tax	28					28
Treasury stock activity	(413)				(413)
Effect of Accounting Standards Update 2014-09	5			5
Effect of Accounting Standards Update 2016-01				11		(11)
Effect of Accounting Standards Update 2018-02				202		(202)
Balance at Jun. 30, 2018	$ 1,699	$ 1	$ 1,932	$ 2,236	$ (1,385)	$ (1,085)

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]
Dividends declared per share	$ 0.72	$ 0.60	$ 1.44	$ 1.20

Description of Business

Description of Business	6 Months Ended
	Jun. 30, 2018
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 the governmental, energy, and oil and gas markets. HII conducts most of its business with the U.S. Government, principally the Department of Defense ("DoD"). As prime contractor, principal subcontractor, team member, or partner, the Company participates in many high-priority U.S. defense technology programs. Through its Ingalls segment, HII is a builder of amphibious assault and expeditionary 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, including fleet support, integrated mission solutions, nuclear and environmental, and oil and gas services.

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2018
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. Additionally, certain prior year amounts have been reclassified to conform to the current year presentation. See Note 3: Accounting Standards Updates. 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, 2017 . 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. In August 2011, the Budget Control Act established limits on U.S. Government discretionary spending and provided for potential sequestration cuts to defense spending and non-defense discretionary spending. The Bipartisan Budget Act of 2018 (the "BBA 2018") provided sequestration relief for fiscal years 2018 and 2019. Sequestration remains in effect for fiscal years 2020 and 2021 and could result in significant decreases in DoD spending that could negatively impact the Company's consolidated financial position, results of operations, or cash flows, as well as its estimated recovery of goodwill and other long-lived assets. Revenue Recognition - Effective January 1, 2018, the Company adopted the requirements of Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers (Topic 606) and related amendments . Prior to January 1, 2018, the Company recognized revenue in accordance with Accounting Standards Codification Topic 605-35 Construction-Type and Production-Type Contracts utilizing the cost-to-cost measure of the percentage-of-completion method of accounting, primarily based upon total costs incurred, with incentive fees included in sales when the amounts could be reasonably determined and estimated . Amounts representing change orders, claims, requests for equitable adjustment, or limitations of funding were included in sales only when they could be reliably estimated and realization was probable. For additional information on the new standard and the impact to the Company's results of operations, refer to Note 3: Accounting Standards Updates. Most of the Company's revenues are derived from long-term contracts for the production of goods and services provided to its U.S. Government customers. The Company generally recognizes revenues on contracts with U.S. Government customers over time using a cost-to-cost measure of progress. The use of the cost-to-cost method to measure performance progress over time is supported by clauses in the related contracts that allow the customer to unilaterally terminate the contract for convenience, pay the Company for costs incurred plus a reasonable profit, and take control of any work in process. The Company utilizes the cost-to-cost method to measure performance progress, because it best reflects the continuous transfer of control over the related goods and services to the customer as the Company satisfies its performance obligations. Where the customer is not a U.S. Government entity, the Company may recognize revenue over time or at a point in time when control transfers upon delivery, depending upon the facts and circumstances of the related arrangement. Where the Company determines that revenue should be recognized over time, the Company utilizes a measure of progress that best depicts the transfer of control of the relevant goods and services to the customer. Generally, the terms and conditions of the contracts result in a transfer of control over the related goods and services as the Company satisfies its performance obligations. Accordingly, the Company recognizes revenue over time using the cost-to-cost method to measure performance progress. The Company may, however, utilize a measure of progress other than cost-to-cost, such as a labor-based measure of progress, or recognize revenue at the point in time at which control is transferred to the customer if the terms and conditions of the arrangement require such accounting. When using the cost-to-cost method to measure performance progress, certain contracts may include costs that are not representative of performance progress, such as large upfront purchases of uninstalled materials, unexpected waste, or inefficiencies. In these cases, the Company adjusts its measure of progress to exclude such costs, with the goal of better reflecting the transfer of control over the related goods or services to the customer and recognizing revenue only to the extent of the costs incurred that reflect the Company's performance under the contract. A performance obligation is a promise to transfer a distinct good or service to the customer and is the unit of account for which revenue is recognized. To determine the proper revenue recognition method, consideration is given to whether two or more contracts should be combined and accounted for as one contract and whether a single contract consists of more than one performance obligation. For contracts with multiple performance obligations, the contract transaction price is allocated to each performance obligation using an estimate of the standalone selling price based upon expected cost plus a margin at contract inception, which is generally the price disclosed in the contract. Contracts are often modified to account for changes in contract specifications and requirements. 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 amount of revenue recognized as the Company satisfies performance obligations associated with contracts with customers is based upon the determination of transaction price. Transaction price reflects the amount of consideration to which the Company expects to be entitled for performance under the terms and conditions of the relevant contract and may reflect fixed and variable components, including shareline incentive fees whereby the value of the contract is variable based upon the amount of costs incurred, as well as other incentive fees based upon achievement of contractual schedule commitments or other specified criteria in the contract. Shareline incentive fees are determined based upon the formula under the relevant contract using the Company’s estimated cost to complete each period. The Company generally utilizes a most likely amount approach to estimate variable consideration. In all such instances, the estimated revenues represent those amounts for which the Company believes a significant reversal of revenue is not probable. Contract Estimates - In estimating contract costs, the Company utilizes a profit-booking rate based upon performance expectations that takes into consideration a number of assumptions and estimates regarding risks related to technical requirements, feasibility, schedule, and contract costs. Management performs periodic reviews of the contracts to evaluate the underlying risks, which may increase the profit-booking rate as the Company is able to mitigate and retire such risks. Conversely, if the Company is not able to retire these risks, cost estimates may increase, resulting in a lower profit-booking rate. The cost estimation process requires significant judgment and is based upon the professional knowledge and experience of the Company’s engineers, program managers, and financial professionals. Factors considered in estimating the work to be completed and ultimate contract recovery include the availability, productivity, and cost of labor, the nature and complexity of the work to be performed, the effect of change orders, the availability of materials, the effect of any performance delays, the availability and timing of funding from the customer, and the recoverability of any claims included in the estimates to complete. Changes in estimates of sales, costs, and profits on a performance obligation are recognized using the cumulative catch-up method of accounting, which recognizes in the current period the cumulative effect of the changes in current and prior periods. A significant change in an estimate on one or more contracts in a period could have a material effect on the Company's unaudited condensed consolidated financial position or results of operations for that period. When estimates of total costs to be incurred exceed estimates of total revenue to be earned on a performance obligation related to a complex, construction-type contract, a provision for the entire loss on the performance obligation is recognized in the period the loss is determined. Accounts Receivable - Accounts receivable include amounts related to any unconditional Company right to receive consideration and are presented as receivables in the unaudited condensed consolidated statement of financial position, separate from other contract balances. Accounts receivable are comprised of amounts billed and currently due from customers. The Company reports accounts receivable net of an allowance for doubtful accounts. Because the Company's accounts receivable are primarily with the U.S. Government or with companies acting as a contractor to the U.S. Government, the Company does not have material exposure to accounts receivable credit risk. Contract Assets - 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, including retention amounts. Contract assets are classified as current assets and, in accordance with industry practice, include amounts that may be billed and collected beyond one year due to the long term nature of many of the Company's contracts. Contract assets are transferred to accounts receivable when the right to consideration becomes unconditional. Contract Liabilities - Contract liabilities are comprised of advance payments, billings in excess of revenues, and deferred revenue amounts. Such advances are generally not considered a significant financing component, because they are utilized to pay for contract costs within a one year period. Contract liability amounts are recognized as revenue once the requisite performance progress has occurred. Inventoried Costs - Inventoried costs primarily relate to company owned raw materials, which are stated at the lower of cost or net realizable value, generally using the average cost method, and costs capitalized pursuant to applicable provisions of the Federal Acquisition Regulation ("FAR") and Cost Accounting Standards ("CAS"). Under the Company's U.S. Government contracts, the customer asserts title to, or a security interest in, inventories related to such contracts as a result of contract advances, performance-based payments, and progress payments. In accordance with industry practice, inventoried costs are classified as current assets and include amounts related to contracts having production cycles longer than one year. Warranty Costs - Certain of the Company’s contracts contain assurance-type warranty provisions, which generally promise that the service or vessel will comply with agreed upon specifications. In such instances, the Company accrues the estimated loss by a charge to income in the relevant period. In limited circumstances,the Company's complex construction type contracts may provide the customer with an option to purchase a warranty or provide an extended assurance service coupled with the primary assurance warranty. In such cases, the Company accounts for the warranty as a separate performance obligation to the extent it is material within the context of the contract. Warranty liabilities are reported within other current liabilities and are not material. 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, 2018 , the Company recognized cash grant benefits of approximately $19 million in other long-term liabilities in the unaudited condensed consolidated statements of financial position. For the six months ended June 30, 2017 , the Company recognized no grant benefits. 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 established to fund certain non-qualified pension plans. These trusts were valued at $104 million and $94 million as of June 30, 2018 , and December 31, 2017 , respectively, and are presented within miscellaneous other assets within the unaudited condensed consolidated statements of financial position. These trusts consist primarily of available-for-sale investments in marketable securities, which are held at fair value within Level 1 of the fair value hierarchy. Related Party Transactions - On March 29, 2011, HII entered into a Separation and Distribution Agreement (the "Separation Agreement") with its former parent company, Northrop Grumman Corporation ("Northrop Grumman"), and Northrop Grumman's subsidiaries (Northrop Grumman Shipbuilding, Inc. and Northrop Grumman Systems Corporation), pursuant to which HII was legally and structurally separated from Northrop Grumman. As of December 31, 2017 , the Company was due $8 million from Northrop Grumman under spin-off related agreements. For the six months ended June 30, 2018 , the Company received $8 million from Northrup Grumman under spin-off related agreements. As of each of June 30, 2018 , and December 31, 2017 , the Company had $84 million outstanding under Industrial Revenue Bonds issued by the Mississippi Business Finance Corporation. Prior to the spin-off, repayment of principal and interest was guaranteed by Northrop Grumman Systems Corporation. The guaranty remains in effect, and the Company has agreed to indemnify Northrop Grumman Systems Corporation for any losses related to the guaranty.

Accounting Standards Updates

Accounting Standards Updates	6 Months Ended
	Jun. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Standards Updates	ACCOUNTING STANDARDS UPDATES Effective January 1, 2018, the Company adopted the requirements of ASU 2014-09, "Revenue from Contracts with Customers (Topic 606), " and related amendments, which provide a single revenue recognition model under which the Company should recognize revenue to portray the transfer of promised goods or service in a manner reflective of the consideration the Company is entitled to receive in exchange for those goods or services. The Company used the modified retrospective method and related practical expedient in its application of the new standard to those contracts that were not completed as of January 1, 2018, and reflected the cumulative effect of changes in the opening balance of retained earnings. Results for reporting periods beginning after January 1, 2018, were presented under Topic 606, while prior period amounts were not adjusted and were reported in accordance with the Company's historic accounting practices under Topic 605. The adoption of Topic 606 did not have a significant impact on the Company's unaudited condensed consolidated financial statements, contracting and accounting processes, internal controls, or information technology systems. For the consolidated statements of operations and comprehensive income (loss), the new standard supports the recognition of revenue over time under the cost-to-cost input method, which is consistent with the Company’s previous revenue recognition model for a substantial majority of its contracts. The most significant impact of the new standard was the modification and expansion of the Company’s disclosures as they relate to revenues and contract balances. Pre-contract fulfillment costs requiring capitalization are not material. On the Company’s unaudited condensed consolidated statements of financial position, contract assets and liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. The application of the new standard is materially consistent with the Company’s previous accounting policies related to contract balances. In accordance with the new standard, unbilled accounts receivable were reclassified as contract assets and advance payments and billings in excess of revenue were reclassified as contract liabilities as of June 30, 2018 , and December 31, 2017, none of which resulted in a change to total current assets or total current liabilities. As part of the transition, the Company also classified in contract assets approximately $64 million of retention amounts arising from contractual provisions, since the right to collect is based on certain conditions other than the passage of time. These retention amounts were previously reported within billed accounts receivable. Under Topic 605, the Company included warranty costs specified in a contract as contract costs. Under Topic 606, assurance-type warranty costs are not deemed to be part of a performance obligation and, therefore, are included within warranty liabilities, which are not material. The adoption of Topic 606 resulted in a cumulative increase to retained earnings of $5 million , net of $1 million tax expense, as of January 1, 2018, driven by changes in contract assets and warranty liabilities. For the three months ended June 30, 2018 , product sales, operating income, and net earnings increased by less than $1 million and diluted earnings per share increased by $0.01 , due to the adoption of Topic 606. For the six months ended June 30, 2018 , product sales, operating income, and net earnings increased by $1 million and diluted earnings per share increased by $0.01 , due to the adoption of Topic 606. In January 2016, the FASB issued ASU 2016‑01, " Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities," relating to the recognition and measurement of financial assets and liabilities, with further clarifications made in February 2018 with the issuance of ASU 2018-03. The amended guidance requires certain equity investments that are not consolidated and not accounted for under the equity method to be measured at fair value, with changes in fair value recognized in net income rather than as a component of accumulated other comprehensive income (loss). The Company adopted this amended guidance on January 1, 2018, using a prospective transition approach, which did not have a significant impact on the Company's unaudited condensed consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)," which establishes a right-of-use model that requires a lessee to record the right-of-use asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Additional qualitative and quantitative disclosures will be required. ASU 2016-02 will be effective for the Company beginning with the first quarter of 2019 and currently requires the use of a modified retrospective adoption approach. In March 2018, the FASB tentatively approved an optional transition method, which the Company plans to elect, that would instead allow companies to use a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company has established a cross-functional implementation team to evaluate the impact of ASU 2016-02 on the Company’s financial position, results of operations and cash flows. The Company is in the process of executing its implementation plan and performing an assessment of its leasing arrangements and service contracts, as well as evaluating the impact of applying the practical expedients and accounting policy elections. The Company is implementing software that will assist in the recognition of additional assets and liabilities related to leases currently classified as operating leases with durations greater than 12 months, with certain allowable exceptions, to be included on the consolidated statement of financial position. The Company is also in the process of identifying changes to its business processes and controls to support the adoption of the new standard. The Company anticipates the adoption of this new standard will result in an increase in lease-related assets and liabilities on the Company’s consolidated statements of financial position, but does not anticipate any material changes to operating results as a result of recording right-of-use assets and corresponding lease liabilities. In January 2018, the FASB issued ASU 2018-01 Leases, “Land Easement Practical Expedient,” which permits entities to forgo the evaluation of existing land easement arrangements to determine if they contain a lease as part of the adoption of ASU 2016-02 issued in February 2016. Accordingly, the Company’s accounting treatment of any existing land easement arrangements will not change. The Company will adopt this standard update concurrently with ASU 2016-02. In March 2017, the FASB issued ASU 2017-07, "Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost." The update requires employers to present the service cost component of the net periodic benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. The other components of net benefit cost, including interest cost, expected return on plan assets, amortization of prior service cost/credit and actuarial gain/loss, and settlement and curtailment effects, are presented outside of any subtotal of operating income. Employers are required to disclose the line(s) used to present the other components of net periodic benefit cost, if the components are not presented separately in the income statement. ASU 2017-07 became effective for fiscal years and interim periods beginning after December 15, 2017. The Company adopted ASU 2017-07 on January 1, 2018, using the retrospective method, which changed the FAS/CAS Adjustment within operating income, offset by a corresponding change in other income (expense), as a result of reclassifying interest cost, expected return on plan assets, amortization of prior service cost/credit and actuarial gain/loss, and settlement and curtailment effects of net periodic benefit expense. Additionally, the remaining FAS/CAS Adjustment within operating income was reclassified from general and administrative expenses to cost of product sales and service revenues. The adoption of ASU 2017-07 did not have a material impact on the Company's unaudited condensed consolidated statements of financial position, cash flows, accounting processes, or internal controls. The following table is a schedule of the impact of adoption of ASU 2017-07 for the three and six months ended June 30, 2017 . The Company has reclassified the following line items on its previously issued consolidated financial statements to conform to the current year presentation. As Previously Reported As Presented Three Months Ended Six Months Ended Three Months Ended Six Months Ended (in millions, except per share amounts) June 30, 2017 June 30, 2017 June 30, 2017 June 30, 2017 Cost of product sales $ 1,104 $ 2,174 $ 1,061 $ 2,088 Cost of service revenues $ 385 $ 748 $ 375 $ 728 General and administrative expenses $ 133 $ 262 $ 182 $ 360 Operating income (loss) $ 237 $ 401 $ 241 $ 409 Non-operating retirement expense $ — $ — $ (4 ) $ (8 ) In May 2017, the FASB issued ASU 2017-10, "Service Concession Arrangements (Topic 853): Determining the Customer of the Operation Services," which addresses how an operating entity should determine the customer for operations under a service concession arrangement. The update clarifies that the grantor is the customer of the operation services in all cases for these arrangements. This standard is effective for annual reporting periods beginning after December 15, 2017. The FASB permitted companies to adopt the new standard early, but not before the original effective date of annual reporting periods beginning after December 15, 2016. The Company is currently evaluating the impact of ASU 2017-10 on its consolidated financial statements and disclosures, accounting processes, or internal controls. In February 2018, the FASB issued ASU 2018-02, "Income Statement-Reporting Comprehensive Income (Topic 220), Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income," which provides for the reclassification from accumulated other comprehensive income to retained earnings of stranded tax effects resulting from the Tax Cuts and Jobs Act (the "Tax Act"). This update is effective for all entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, and early adoption is permitted. Effective January 1, 2018, the Company early adopted the amendments in this update prospectively and, accordingly, reclassified the income tax effects of the Tax Act from accumulated other comprehensive income to retained earnings. See Note 12: Income Taxes, for further disclosure. In June 2018, the FASB issued ASU 2018-08, “Not-For-Profit Entities (Topic 958): Clarifying the Scope and the Accounting Guidance for Contributions Received and Contributions Made,” which assists entities to evaluate the nature and accounting treatment of contributions received. The update applies to business entities that receive contributions of cash or other assets, but does not apply to transfers of assets from government entities to business entities. This standard is effective for annual reporting periods beginning after December 15, 2018. The update should be applied on a modified prospective basis. The Company is currently evaluating the impact of ASU 2018-08 on its consolidated financial statements and disclosures, accounting processes, or internal controls related to periodic government grants received as reimbursements of costs or related to depreciable assets. Other accounting pronouncements issued but not effective until after December 31, 2018, are not expected to have a material impact on the Company's consolidated financial position, results of operations, or cash flows.

Avondale

Avondale	6 Months Ended
	Jun. 30, 2018
Restructuring and Related Activities [Abstract]
Avondale	AVONDALE In 2010, plans were announced to consolidate the Company's Ingalls shipbuilding operations by winding down shipbuilding at the Avondale, Louisiana facility in 2013 after completion of LPD-class ships that were under construction at this facility. In October 2014, the Company ceased shipbuilding construction operations at the Avondale facility. In connection with and as a result of the decision to wind down shipbuilding at the Avondale facility, the Company began incurring and paying related costs, including, but not limited to, severance expense, relocation expense, and asset write-downs related to the Avondale facilities. Pursuant to applicable provisions of the FAR and Cost Accounting Standards for the treatment of restructuring and shutdown related costs, the Company began amortizing the deferred costs over a five year period in 2014, when the Company ceased shipbuilding construction operations at the Avondale facility. The Company engaged in communications and negotiations with the U.S. Government beginning in 2010 regarding the amount and recovery of the Company's restructuring and shutdown costs. On November 16, 2017, the U.S. Government and the Company reached a settlement of the Company’s claim for restructuring costs. Under the terms of the settlement, $251 million is being treated as allowable costs. Any future gain or loss associated with disposition of the land, facilities, and capital assets located at Avondale was excluded from the settlement and will be recorded by the Company at the time of disposition. The settlement was consistent with management’s cost recovery expectations and did not have a material effect on the Company's consolidated financial position or results of operations. The Company anticipates that a majority of these restructuring and shutdown related costs will be billed to the U.S. Government and collected by the end of 2018. In 2017, the Company and a potential buyer of the Avondale facility entered into a Purchase and Sale Agreement, which is subject to certain closing conditions. As of June 30, 2018 , Avondale assets held for sale totaled $41 million and are presented within prepaid expenses and other current assets in the unaudited condensed consolidated statements of financial position.

Gulfport

Gulfport	6 Months Ended
	Jun. 30, 2018
Restructuring and Related Activities [Abstract]
Gulfport	GULFPORT In September 2013, the Company announced the closure of its Gulfport Composite Center of Excellence in Gulfport, Mississippi, part of the Ingalls reportable segment, which it completed in August 2014. In connection with this closure, the Company incurred total costs of $54 million , consisting of $52 million in accelerated depreciation of fixed assets and $2 million in personnel, facility shutdown, and other related costs. In March 2015, the Company sold the Gulfport Composite Center of Excellence to the Mississippi State Port Authority for $32 million , resulting in a gain on disposition of $9 million , recorded as a reduction to contract costs in accordance with the terms of the Company’s contracts with the U.S. Government. The Company has received communications from the Supervisor of Shipbuilding questioning the Company's treatment and proposed allocation of the Gulfport closure costs. The Company has responded to such communications with the position that its proposed accounting and allocation of the closure costs complies with applicable law, and the Company and the U.S. Government remain in discussions about the proper accounting and allocation of such costs. While the Company anticipates a resolution that is substantially in accordance with management's cost recovery expectations, any inability to recover such costs substantially in accordance with the Company's cost recovery expectations could result in a material effect on the Company’s consolidated financial position, results of operations, or cash flows.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2018
Stockholders' Equity Note [Abstract]
Stockholders' Equity [Text Block]	STOCKHOLDERS' EQUITY Treasury Stock - On November 7, 2017, the Company's board of directors authorized an increase in the Company's stock repurchase program from $1.2 billion to $2.2 billion and an extension of the term of the program to October 31, 2022. 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, 2018 , the Company repurchased 1,805,667 shares at an aggregate cost of $413 million , of which approximately $7 million was not yet settled for cash as of June 30, 2018 . For the six months ended June 30, 2018 , the Company also settled for cash $2 million of shares repurchased in the prior year. For the six months ended June 30, 2017 , the Company repurchased 1,065,737 shares at an aggregate cost of $210 million , of which approximately $3 million was not yet settled for cash as of June 30, 2017 . The cost of purchased shares is recorded as treasury stock in the unaudited condensed consolidated statements of financial position and the unaudited condensed consolidated statements of changes in equity. Dividends - The Company declared cash dividends per share of $0.72 and $0.60 for the three months ended June 30, 2018 and 2017 , respectively. The Company declared cash dividends per share of $1.44 and $1.20 for the six months ended June 30, 2018 and 2017 , respectively. The Company paid cash dividends totaling $64 million and $55 million for the six months ended June 30, 2018 and 2017 , respectively. Accumulated Other Comprehensive Income (Loss) - Other comprehensive income (loss) refers to gains and losses recorded as an element of stockholders' equity but excluded from net earnings (loss). The accumulated other comprehensive loss as of June 30, 2018 , was comprised of unamortized benefit plan costs of $1,080 million and other comprehensive loss items of $5 million . The accumulated other comprehensive loss as of December 31, 2017 , was comprised of unamortized benefit plan costs of $906 million and other comprehensive income items of $6 million . The changes in accumulated other comprehensive income (loss) by component for the three and six months ended June 30, 2018 and 2017 , were as follows: ($ in millions) Benefit Plans Other Total Balance as of March 31, 2017 $ (935 ) $ — $ (935 ) Other comprehensive income (loss) before reclassifications — 3 3 Amounts reclassified from accumulated other comprehensive income (loss) Amortization of net actuarial loss (gain) 1 23 — 23 Tax benefit (expense) for items of other comprehensive income (9 ) (1 ) (10 ) Net current period other comprehensive income (loss) 14 2 16 Balance as of June 30, 2017 (921 ) 2 (919 ) Balance as of March 31, 2018 (1,095 ) (3 ) (1,098 ) Other comprehensive income (loss) before reclassifications — (2 ) (2 ) Amounts reclassified from accumulated other comprehensive income (loss) Amortization of net actuarial loss (gain) 1 21 — 21 Tax benefit (expense) for items of other comprehensive income (6 ) — (6 ) Net current period other comprehensive income (loss) 15 (2 ) 13 Balance as of June 30, 2018 $ (1,080 ) $ (5 ) $ (1,085 ) ($ in millions) Benefit Plans Other Total Balance as of December 31, 2016 $ (948 ) $ (3 ) $ (951 ) Other comprehensive income (loss) before reclassifications — 7 7 Amounts reclassified from accumulated other comprehensive income (loss) Amortization of prior service cost (credit) 1 (1 ) — (1 ) Amortization of net actuarial loss (gain) 1 46 — 46 Tax benefit (expense) for items of other comprehensive income (18 ) (2 ) (20 ) Net current period other comprehensive income (loss) 27 5 32 Balance as of June 30, 2017 (921 ) 2 (919 ) Balance as of December 31, 2017 (906 ) 6 (900 ) Other comprehensive income (loss) before reclassifications — (2 ) (2 ) Amounts reclassified from accumulated other comprehensive income (loss) Amortization of prior service cost (credit) 1 1 — 1 Amortization of net actuarial loss (gain) 1 40 — 40 Tax benefit (expense) for items of other comprehensive income (11 ) — (11 ) Net current period other comprehensive income (loss) 30 (2 ) 28 Effect of Accounting Standards Update 2016-01 2 — (11 ) (11 ) Effect of Accounting Standards Update 2018-02 3 (204 ) 2 (202 ) Balance as of June 30, 2018 $ (1,080 ) $ (5 ) $ (1,085 ) 1 These accumulated comprehensive income (loss) components are included in the computation of net periodic benefit cost. See Note 16: Employee Pension and Other Postretirement Benefits. The tax benefit associated with amounts reclassified from accumulated other comprehensive income (loss) for the three months ended June 30, 2018 and 2017 , was $6 million and $9 million , respectively. The tax benefit associated with amounts reclassified from accumulated other comprehensive income (loss) for the six months ended June 30, 2018 and 2017 , was $11 million and $18 million , respectively. 2 The Company adopted ASU 2016-01 as of January 1, 2018. Accordingly, accumulated other comprehensive income of $11 million related to available-for-sale securities, net of $4 million tax expense, was reclassified to retained earnings. 3 The Company adopted ASU 2018-02 as of January 1, 2018. Accordingly, stranded tax effects of $202 million related to the Tax Act were reclassified to retained earnings.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2018
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) 2018 2017 2018 2017 Net earnings (loss) $ 239 $ 147 $ 395 $ 266 Weighted-average common shares outstanding 44.2 45.7 44.5 46.0 Net dilutive effect of stock options and awards 0.1 0.1 0.1 0.1 Dilutive weighted-average common shares outstanding 44.3 45.8 44.6 46.1 Earnings (loss) per share - basic $ 5.41 $ 3.22 $ 8.88 $ 5.78 Earnings (loss) per share - diluted $ 5.40 $ 3.21 $ 8.86 $ 5.77 Under the treasury stock method, the Company has excluded from the diluted share amounts presented above the effects of 0.3 million Restricted Performance Stock Rights ("RPSRs") for the three and six months ended June 30, 2018 . The Company has excluded from diluted share amounts presented above the effects of 0.3 million and 0.4 million RPSRs for the three and six months ended June 30, 2017 , respectively.

Revenue

Revenue	6 Months Ended
	Jun. 30, 2018
Disaggregation of Revenue [Abstract]
Revenue Recognition and Deferred Revenue [Abstract]	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 9: Segment Information. For more detailed information regarding the Company's significant accounting policy for revenue, see Note 2: Basis of Presentation. 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 primarily generates revenue under U.S. Government contracts from the provision of fleet support and integrated mission solutions 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 over the course of a short-duration period and may continue to perform upon exercise of related period of performance options that are also short in duration, generally one year. 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, in the case of 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 and oil and gas 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. See Note 9: Segment Information. 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, 2018 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 577 $ 903 $ 19 $ — $ 1,499 Service revenues 52 277 192 — 521 Intersegment — 3 32 (35 ) — Sales and service revenues $ 629 $ 1,183 $ 243 $ (35 ) $ 2,020 Customer Type Federal $ 629 $ 1,180 $ 141 $ — $ 1,950 Commercial — — 69 — 69 State and local government agencies — — 1 — 1 Intersegment — 3 32 (35 ) — Sales and service revenues $ 629 $ 1,183 $ 243 $ (35 ) $ 2,020 Contract Type Firm fixed-price $ 18 $ 1 $ 41 $ — $ 60 Fixed-price incentive 528 480 — — 1,008 Cost-type 83 699 92 — 874 Time and materials — — 78 — 78 Intersegment — 3 32 (35 ) — Sales and service revenues $ 629 $ 1,183 $ 243 $ (35 ) $ 2,020 Six Months Ended June 30, 2018 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 1,111 $ 1,725 $ 33 $ — $ 2,869 Service revenues 103 537 385 — 1,025 Intersegment — 3 58 (61 ) — Sales and service revenues $ 1,214 $ 2,265 $ 476 $ (61 ) $ 3,894 Customer Type Federal $ 1,214 $ 2,262 $ 292 $ — $ 3,768 Commercial — — 125 — 125 State and local government agencies — — 1 — 1 Intersegment — 3 58 (61 ) — Sales and service revenues $ 1,214 $ 2,265 $ 476 $ (61 ) $ 3,894 Contract Type Firm fixed-price $ 42 $ 4 $ 81 $ — $ 127 Fixed-price incentive 1,014 897 1 — 1,912 Cost-type 158 1,361 185 — 1,704 Time and materials — — 151 — 151 Intersegment — 3 58 (61 ) — Sales and service revenues $ 1,214 $ 2,265 $ 476 $ (61 ) $ 3,894 Three Months Ended Six Months Ended ($ in millions) 2018 2018 Major Programs Amphibious assault ships $ 327 $ 615 Surface combatants and coast guard cutters 302 598 Other — 1 Total Ingalls 629 1,214 Aircraft carriers 654 1,241 Submarines 386 745 Other 143 279 Total Newport News 1,183 2,265 Government and energy services 201 395 Oil and gas services 42 81 Total Technical Solutions 243 476 Intersegment eliminations (35 ) (61 ) Sales and service revenues $ 2,020 $ 3,894 As of June 30, 2018 , the Company had $21.2 billion of remaining performance obligations. The Company expects to recognize approximately 50% of its remaining performance obligations as revenue through 2019, an additional 35% through 2021, and the balance thereafter. Cumulative Catch-up Adjustments For the three months ended June 30, 2018 and 2017 , net cumulative catch-up adjustments increased operating income by $37 million and $60 million , respectively, and increased diluted earnings per share by $0.66 and $0.85 , respectively. For the six months ended June 30, 2018 and 2017 , net cumulative catch-up adjustments increased operating income by $65 million and $86 million , respectively, and increased diluted earnings per share by $1.15 and $1.21 , respectively. No individual adjustment was material to the Company's unaudited condensed consolidated statements of operations and comprehensive income for the three and six months ended June 30, 2018 . Cumulative catch-up adjustments for the three and six months ended June 30, 2017 , included favorable adjustments of $30 million on a contract at the Ingalls segment, which increased diluted earnings per share by $0.42 in both periods. Contract Balances Contract balances include accounts receivable, contract assets, and contract liabilities from contracts with customers. 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 $255 million from December 31, 2017 to June 30, 2018, primarily due to an increase in contract assets as a result of revenue on certain U.S. Navy contracts. For the three and six months ended June 30, 2018 , the Company recognized revenue of $1 million and $87 million , respectively, related to its contract liabilities as of December 31, 2017.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2018
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, 2018 and 2017 : Three Months Ended Six Months Ended ($ in millions) 2018 2017 2018 2017 Sales and Service Revenues Ingalls $ 629 $ 639 $ 1,214 $ 1,189 Newport News 1,183 1,001 2,265 1,972 Technical Solutions 243 244 476 469 Intersegment eliminations (35 ) (26 ) (61 ) (48 ) Sales and service revenues $ 2,020 $ 1,858 $ 3,894 $ 3,582 Operating Income (Loss) Ingalls $ 83 $ 98 $ 147 $ 164 Newport News 91 80 142 152 Technical Solutions 7 9 9 (9 ) Segment operating income (loss) 181 187 298 307 Non-segment factors affecting operating income (loss) Operating FAS/CAS Adjustment 73 53 145 106 Non-current state income taxes 3 1 5 (4 ) Operating income (loss) $ 257 $ 241 $ 448 $ 409 Operating FAS/CAS Adjustment - The Operating FAS/CAS Adjustment represents the difference between the service cost component of our pension and other postretirement expense determined in accordance with GAAP ("FAS") and our pension and other postretirement expense under U.S. Cost Accounting Standards ("CAS"). The following table presents the Company's assets by segment. ($ in millions) June 30 December 31 Assets Ingalls $ 1,474 $ 1,385 Newport News 3,571 3,350 Technical Solutions 671 642 Corporate 659 997 Total assets $ 6,375 $ 6,374

Inventoried Costs, Net

Inventoried Costs, Net	6 Months Ended
	Jun. 30, 2018
Inventory Disclosure [Abstract]
Inventoried Costs, Net	INVENTORIED COSTS, NET Inventoried costs were comprised of the following: ($ in millions) June 30 December 31 Production costs of contracts in process 1 $ 75 $ 90 Raw material inventory 99 93 Total inventoried costs, net $ 174 $ 183 1 Includes amounts capitalized p ursuant to applicable provisions of the FAR and Cost Accounting Standards.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2018
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, 2018 , and December 31, 2017 , were $2,877 million . The accumulated goodwill impairment losses for Ingalls as of each of June 30, 2018 , and December 31, 2017 , were $1,568 million . The accumulated goodwill impairment losses for Newport News as of each of June 30, 2018 , and December 31, 2017 , were $1,187 million . The accumulated goodwill impairment losses for Technical Solutions as of each of June 30, 2018 , and December 31, 2017 , were $122 million . Other Intangible Assets The Company's purchased intangible assets are being amortized on a straight-line basis or a method based on the pattern of benefits over their estimated useful lives. Net intangible assets consist principally of amounts pertaining 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 $9 million for each of the three months ended June 30, 2018 and 2017 , and $18 million and $20 million for the six months ended June 30, 2018 and 2017 , respectively. The Company expects amortization expense for purchased intangible assets of approximately $36 million in 2018, $32 million in 2019, $28 million in 2020, $26 million in 2021, and $24 million in 2022.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The Company's earnings are primarily domestic, and its effective tax rates on earnings from operations for the three months ended June 30, 2018 and 2017 , were 8.8% and 32.6% , respectively. For the six months ended June 30, 2018 and 2017, the Company's effective tax rates on earnings from operations were 13.6% and 27.1% , respectively. The lower effective tax rate for the three months ended June 30, 2018 , was primarily attributable to a claim for higher research and development tax credits for the post-spin-off 2011 through 2015 tax years and the reduction in the federal corporate income tax rate, partially offset by an increase in unrecognized tax benefits and the repeal of the domestic manufacturing deduction effective January 1, 2018. The lower effective tax rate for the six months ended June 30, 2018 , was primarily attributable to the reduction in the federal corporate income tax rate and a claim for higher research and development tax credits for the post-spin-off 2011 through 2015 tax years, partially offset by a reduction in the income tax benefits resulting from stock award settlement activity and an increase in unrecognized tax benefits. The reduction in the federal corporate income tax rate from 35% to 21% and the repeal of the domestic manufacturing deduction are provisions of the Tax Act. For the three and six months ended June 30, 2018 , the Company's effective tax rates differed from the federal statutory rates primarily as a result of a claim for higher research and development tax credits for the post-spin-off 2011 through 2015 tax years. For the three and six months ended June 30, 2017 , the Company's effective tax rates differed from the federal statutory rates primarily as a result of the income tax benefits resulting from stock award settlement activity and the domestic manufacturing deduction. Tax Reform - The Tax Act, signed into law on December 22, 2017, provides for significant changes to U.S. federal income tax law, including a provision that allows for full expensing of certain qualified property, reduction of the federal corporate income tax rate from 35% to 21% , repeal of the domestic manufacturing deduction, and further limitations on the deductibility of certain executive compensation. The SEC staff issued Staff Accounting Bulletin 118, which provides guidance on accounting for the tax effects of the Tax Act in the reporting period of enactment, including a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under Accounting Standards Codification 740, Income Taxes. The Company's accounting for the Tax Act is incomplete. As disclosed in the Company's Annual Report on Form 10-K for 2017, the Company was able to reasonably estimate certain effects and, for the reduction in the U.S. federal corporate income tax rate, the Company recorded provisional decreases in its deferred tax assets and deferred tax liabilities of $252 million and $196 million , respectively, with a corresponding net adjustment to deferred income tax expense of $56 million , for the year ended December 31, 2017. The Company has not made any additional measurement period adjustments for the reduction in the corporate income tax rate, which may be affected by other analyses related to the Tax Act, including, but not limited to, accounting method changes for tax purposes that could result in adjustments to temporary federal tax differences. For the acceleration of depreciation for assets qualifying for immediate expensing, the Company recorded a provisional benefit of $8 million for the year ended December 31, 2017, based on the Company’s intent to fully expense all qualifying expenditures. This resulted in a decrease of approximately $8 million to the Company's current income taxes payable and a corresponding decrease in its net deferred tax assets , excluding the effect of the reduction in the U.S. federal corporate income tax rate, for the year ended December 31, 2017. The Company has not yet completed its determination of which assets qualify for immediate expensing, and no additional measurement period adjustment was recorded for this item. As disclosed in the Company's Annual Report on Form 10-K for 2017, the Company was not able to reasonably estimate the effect of the Tax Act changes to the deductibility of executive compensation, and, therefore, no provisional adjustment was recorded. These changes included repeal of the performance-based compensation exception to the $1 million deduction limitation of Internal Revenue Code Section 162(m) and revision of the employees subject to the $1 million deduction limitation. The only exception to this rule is compensation paid pursuant to a binding contract in effect on November 2, 2017 that would have otherwise been deductible under prior Section 162(m) rules. Accordingly, any compensation paid in the future pursuant to compensation arrangements entered into after November 2, 2017, even if performance-based, will count toward the $1 million annual deduction limit if paid to an executive subject to Section 162(m). The Company has not yet completed an analysis of the binding contract requirement on its various compensation plans to determine the impact of the change in law. Accordingly, no additional measurement period adjustment was recorded. Adoption of ASU 2018-02 - The Company early adopted ASU 2018-02, "Income Statement-Reporting Comprehensive Income (Topic 220), Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income," which provides for the reclassification from accumulated other comprehensive income to retained earnings of stranded tax effects resulting from the Tax Act. In accordance with the provisions of the ASU, $202 million of stranded tax effects related to the Tax Act were reclassified from accumulated other comprehensive income to retained earnings in the first quarter of 2018. This reclassification includes the impact of the change in the federal corporate income tax rate and the related federal benefit of state taxes. The Company’s accounting policy with respect to releasing income tax effects from accumulated other comprehensive income is to apply an aggregate approach whereby the tax effects are measured based on the change in the unrealized gains or losses reflected in other comprehensive income. The Company's unrecognized tax benefits increased $15 million during the three and six months ended June 30, 2018 , for a tax position claimed during the quarter ended June 30, 2018 , related to prior years. Assuming a sustainment of these positions, the reversal of the $15 million accrued would favorably impact the Company’s effective federal income tax rates in future periods. The Company recognizes interest and penalties related to unrecognized tax benefits as income tax expense. As a result of the unrecognized tax benefits noted above, there was an increase in income tax expense of $1 million for interest for the three and six months ended June 30, 2018 . 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 state uncertain tax positions 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, 2018
Debt Disclosure [Abstract]
Debt	DEBT Long-term debt consisted of the following: ($ in millions) June 30 December 31 Senior notes due November 15, 2025, 5.000% 600 600 Senior notes due December 1, 2027, 3.483% 600 600 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 (24 ) (26 ) Total long-term debt $ 1,281 $ 1,279 Credit Facility - In November 2017, the Company terminated its Second Amended and Restated Credit Agreement and entered into a new Credit Agreement (the "Credit Facility") with third-party lenders. 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 revolving credit facility 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 ratings, which may vary between 1.125% and 1.500% . The revolving credit facility also has a commitment fee rate on the unutilized balance based on the Company’s credit ratings. The commitment fee rate as of June 30, 2018 , was 0.25% and may vary between 0.20% and 0.30% . 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. As of June 30, 2018 , approximately $17 million in letters of credit were issued but undrawn, and the remaining $1,233 million of the revolving credit facility was unutilized. The Company had unamortized debt issuance costs associated with its credit facilities of $9 million and $11 million as of June 30, 2018 , and December 31, 2017 , respectively. Senior Notes - In December 2017, the Company issued $600 million aggregate principal amount of 3.483% senior notes with registration rights due December 2027, the net proceeds of which were used to repurchase the Company's 5.000% senior notes due in 2021. Pursuant to the terms of the registration rights agreement entered into in connection with the issuance of these senior notes, the Company completed in June 2018, an exchange of $600 million aggregate principal amount of registered 3.483% senior notes due December 2027 for all of the then outstanding unregistered senior notes due December 2027. The Company also has outstanding $600 million aggregate principal amount of unregistered 5.000% senior notes due November 2025. Interest on the Company’s senior notes is payable semi-annually. The terms of the 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 the senior notes of $15 million as of June 30, 2018 , and December 31, 2017 . Mississippi Economic Development Revenue Bonds - As of each of June 30, 2018 , and December 31, 2017 , the Company had $84 million outstanding under Industrial Revenue Bonds issued by the Mississippi Business Finance Corporation. These bonds accrue interest at a fixed rate of 7.81% per annum (payable semi-annually) and mature in 2024. Gulf Opportunity Zone Industrial Development Revenue Bonds - As of each of June 30, 2018 , and December 31, 2017 , the Company had $21 million outstanding under Gulf Opportunity Zone Industrial Development Revenue Bonds issued by the Mississippi Business Finance Corporation. These bonds accrue interest at a fixed rate of 4.55% per annum (payable semi-annually) and mature in 2028. 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, 2018 . The estimated fair values of the Company's total long-term debt as of June 30, 2018 , and December 31, 2017 , were $1,309 million and $1,361 million , respectively. The fair values of the Company's long-term debt were calculated based on either recent trades of the Company's debt instruments in inactive markets or yields available on debt with substantially similar risks, terms and maturities, which fall within Level 2 under the fair value hierarchy. The Company does not have any principal payments due on long-term debt within the next five years.

Investigations, Claims, and Lit

Investigations, Claims, and Litigation	6 Months Ended
	Jun. 30, 2018
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 2015, the Company received a Civil Investigative Demand from the Department of Justice ("DoJ") relating to an investigation of certain allegedly non-conforming parts the Company purchased from one of its suppliers for use in connection with U.S. Government contracts. The Company has cooperated with the DoJ in connection with its investigation. In 2016, the Company was made aware that it is a defendant in a False Claims Act lawsuit filed under seal in the U.S. District Court for the Middle District of Florida related to the Company’s purchases of the allegedly non-conforming parts from the supplier. Depending upon the outcome of this matter, the Company could be subject to civil penalties, damages, and/or suspension or debarment from future U.S. Government contracts, which could have a material adverse effect on its consolidated financial position, results of operations, or cash flows. The matter remains sealed and given the current posture of the matter, the Company is unable to estimate an amount or range of reasonably possible loss or to express an opinion regarding the ultimate outcome. 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. In January 2013, the Company disclosed to the DoD, including the U.S. Navy, and the U.S. Department of Homeland Security, including the U.S. Coast Guard, pursuant to the FAR, that it had initiated an internal investigation regarding whether certain employees at Ingalls mischarged time or misstated progress on Navy and Coast Guard contracts. The Company conducted an internal investigation, led by external counsel, and took remedial actions, including the termination of employees in instances where the Company believed grounds for termination existed. The Company provided information regarding its investigation to the relevant government agencies, and agreed with the U.S. Navy and U.S. Coast Guard that they would initially withhold $24 million in payments on existing contracts pending receipt of additional information from the Company's internal investigation. The U.S. Navy subsequently reduced its portion of the withhold from $18.2 million to $4.7 million , and the U.S. Coast Guard reduced its withhold from $5.8 million to $3.6 million . In September 2017, the U.S. Navy and the U.S. Coast Guard paid the Company the respective remaining amounts they were withholding. In June 2015, the DoJ informed the Company that it was investigating the matters disclosed by the Company to the DoD in January 2013. In August 2017, the Company settled the matters with the DoJ. This settlement did not have a material effect on the Company’s consolidated financial position, results of operations, or cash flows. 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 average cost per case to resolve cases during the six months ended June 30, 2018 and 2017 , was 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 - 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. The case proceeded towards arbitration, then appeared to settle favorably, but the settlement was overturned in court and the matter returned to litigation. In March 2014, the Company filed an arbitral statement of claim asserting breaches of the contract. In July 2014, the Republic filed a statement of defense in the arbitration denying all the Company’s allegations and a counterclaim alleging late redelivery of the frigates, unfinished work, and breach of warranty. 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 has filed a petition in the United States District Court for the District of Columbia asking the court to confirm or enforce the award. 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 could 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, 2018
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 are included in contract profit margins to the extent of expected recovery based upon contractual entitlements and the probability of successful negotiation with the customer. As of June 30, 2018 , recognized amounts related to 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 may enter into joint ventures, teaming, and other business arrangements to support the Company's products and services. The Company generally strives 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 an arrangement 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, 2018 , 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 in 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, 2018 , the probable future cost for environmental remediation was $1 million , which is accrued in other current liabilities. 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 projects progress 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 standby letters of credit issued by commercial banks and surety bonds issued by insurance companies principally to support the Company's self-insured workers' compensation plans. As of June 30, 2018 , the Company had $17 million in standby letters of credit issued but undrawn, as indicated in Note 13: Debt, and $273 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 HII 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. In February 2018, the Company received the findings of an audit conducted by the Defense Contract Audit Agency citing significant deficiencies in the Company’s Newport News segment's business system for material management. The Company submitted a response in June 2018, agreeing in part and disagreeing in part with the audit findings. In the event the U.S. Government makes a final determination that there are remaining significant deficiencies and that the Company’s proposed corrective actions are inadequate, the U.S. Government may withhold up to 5% from the Company’s interim billings on cost-reimbursement, labor-hour, and time and materials contracts containing the applicable contractor business systems clause, until the U.S. Government determines all significant deficiencies have been remediated, which could have a material impact on the timing of the Company’s cash receipts. Collective Bargaining Agreements - Of the Company's approximately 39,000 employees, approximately 50% are covered by a total of nine collective bargaining agreements and two site stabilization agreements. Newport News has four collective bargaining agreements covering represented employees, one of which covers approximately 50% of Newport News employees and was renewed July 2017. The remaining collective bargaining agreements at Newport News expire August 2018, December 2018, and November 2020. 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 35 Technical Solutions craft employees at the Hanford Site near Richland, Washington are represented under an indefinite DoE site stabilization agreement. The Company believes its relationship with its employees is satisfactory. Collective bargaining agreements generally expire after three to five years and are subject to renegotiation at that time. The Company does not expect the results of these negotiations, either individually or in the aggregate, to have a material effect on the Company's consolidated results of operations.

Employee Pension And Other Post

Employee Pension And Other Postretirement Benefits	6 Months Ended
	Jun. 30, 2018
Retirement Benefits [Abstract]
Employee Pension and Other Postretirement Benefits	EMPLOYEE PENSION AND OTHER POSTRETIREMENT BENEFITS The Company provides defined benefit pension plans and postretirement benefit plans, and defined contribution pension plans to eligible employees. The costs of the Company's defined benefit pension plans and other postretirement benefit plans for the three and six months ended June 30, 2018 and 2017 , were as follows: Three Months Ended Six Months Ended Pension Benefits Other Benefits Pension Benefits Other Benefits ($ in millions) 2018 2017 2018 2017 2018 2017 2018 2017 Components of Net Periodic Benefit Cost Service cost $ 40 $ 36 $ 2 $ 2 $ 79 $ 71 $ 4 $ 5 Interest cost 63 66 5 6 127 133 10 12 Expected return on plan assets (108 ) (91 ) — — (215 ) (182 ) — — Amortization of prior service cost (credit) 6 4 (6 ) (4 ) 12 8 (11 ) (9 ) Amortization of net actuarial loss (gain) 21 24 — (1 ) 41 48 (1 ) (2 ) Net periodic benefit cost $ 22 $ 39 $ 1 $ 3 $ 44 $ 78 $ 2 $ 6 The Company made the following contributions to its pension and other postretirement plans for the six months ended June 30, 2018 and 2017 : Six Months Ended ($ in millions) 2018 2017 Pension plans Qualified minimum $ — $ — Discretionary Qualified 84 91 Non-qualified 3 3 Other benefit plans 16 17 Total contributions $ 103 $ 111 For the year ending December 31, 2018, the Company expects cash contributions to its qualified benefit pension plans to be $508 million , all of which will be discretionary.

Stock Compensation Plans

Stock Compensation Plans	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Compensation Plans	STOCK COMPENSATION PLANS During the six months ended June 30, 2018 and 2017 , the Company issued new stock awards as follows: Restricted Performance Stock Rights - For the six months ended June 30, 2018 , the Company granted approximately 0.1 million RPSRs at a weighted average share price of $260.69 . These rights are subject to cliff vesting on December 31, 2020. For the six months ended June 30, 2017 , the Company granted approximately 0.1 million RPSRs at a weighted average share price of $219.47 . These rights are subject to cliff vesting on December 31, 2019. 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 the six months ended June 30, 2018 and 2017 , 0.2 million and 0.4 million stock awards vested, respectively, of which approximately 0.1 million and 0.2 million , respectively, 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, 2018 . Stock Awards (in thousands) Weighted-Average Grant Date Fair Value Weighted-Average Remaining Contractual Term (in years) Total stock awards 403 $ 174.45 1.1 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, 2018 and 2017 , of $8 million and $14 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, 2018 and 2017 , of $15 million and $20 million , respectively The Company recorded tax benefits related to stock awards of $2 million and $5 million , respectively, for the three months ended June 30, 2018 and 2017 . The Company recorded tax benefits related to stock awards of $3 million and $8 million for the six months ended June 30, 2018 and 2017 , respectively. The Company recognized tax benefits associated with the issuance of stock in settlement of stock awards for the three months ended June 30, 2018 and 2017 , of less than $1 million and $1 million , respectively. The Company recognized tax benefits associated with the issuance of stock in settlement of stock awards for the six months ended June 30, 2018 and 2017 , of $7 million and $24 million , respectively. Unrecognized Compensation Expense As of June 30, 2018 , the Company had less than $1 million of unrecognized compensation expense associated with Restricted Stock Rights granted in 2017, which will be recognized over a weighted average period of 1.3 years , and $37 million of unrecognized compensation expense associated with RPSRs granted in 2018, 2017, and 2016, which will be recognized over a weighted average period of 1.3 years .

Subsidiary Guarantors

Subsidiary Guarantors	6 Months Ended
	Jun. 30, 2018
Subsidiary Guarantors [Abstract]
Subsidiary Guarantors	SUBSIDIARY GUARANTORS As described in Note 13, 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, 2018 , and December 31, 2017 , including any repurchase obligations resulting from a change of control, is fully and unconditionally guaranteed, jointly and severally, on an unsecured basis, by each of HII's existing and future material domestic subsidiaries ("Subsidiary Guarantors"). The Subsidiary Guarantors are 100% owned by HII. Under SEC Regulation S-X Rule 3-10, each HII subsidiary that did not provide a guarantee ("Non-Guarantors") is minor and HII, as the parent company issuer, did not have independent assets or operations. There are no significant restrictions on the ability of the parent company and the Subsidiary Guarantors to obtain funds from their respective subsidiaries by dividend or loan, except those imposed by applicable law.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2018
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. Additionally, certain prior year amounts have been reclassified to conform to the current year presentation. See Note 3: Accounting Standards Updates. 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, 2017 .
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. In August 2011, the Budget Control Act established limits on U.S. Government discretionary spending and provided for potential sequestration cuts to defense spending and non-defense discretionary spending. The Bipartisan Budget Act of 2018 (the "BBA 2018") provided sequestration relief for fiscal years 2018 and 2019. Sequestration remains in effect for fiscal years 2020 and 2021 and could result in significant decreases in DoD spending that could negatively impact the Company's consolidated financial position, results of operations, or cash flows, as well as its estimated recovery of goodwill and other long-lived assets.
Revenue Recognition	Revenue Recognition - Effective January 1, 2018, the Company adopted the requirements of Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers (Topic 606) and related amendments . Prior to January 1, 2018, the Company recognized revenue in accordance with Accounting Standards Codification Topic 605-35 Construction-Type and Production-Type Contracts utilizing the cost-to-cost measure of the percentage-of-completion method of accounting, primarily based upon total costs incurred, with incentive fees included in sales when the amounts could be reasonably determined and estimated . Amounts representing change orders, claims, requests for equitable adjustment, or limitations of funding were included in sales only when they could be reliably estimated and realization was probable. For additional information on the new standard and the impact to the Company's results of operations, refer to Note 3: Accounting Standards Updates. Most of the Company's revenues are derived from long-term contracts for the production of goods and services provided to its U.S. Government customers. The Company generally recognizes revenues on contracts with U.S. Government customers over time using a cost-to-cost measure of progress. The use of the cost-to-cost method to measure performance progress over time is supported by clauses in the related contracts that allow the customer to unilaterally terminate the contract for convenience, pay the Company for costs incurred plus a reasonable profit, and take control of any work in process. The Company utilizes the cost-to-cost method to measure performance progress, because it best reflects the continuous transfer of control over the related goods and services to the customer as the Company satisfies its performance obligations. Where the customer is not a U.S. Government entity, the Company may recognize revenue over time or at a point in time when control transfers upon delivery, depending upon the facts and circumstances of the related arrangement. Where the Company determines that revenue should be recognized over time, the Company utilizes a measure of progress that best depicts the transfer of control of the relevant goods and services to the customer. Generally, the terms and conditions of the contracts result in a transfer of control over the related goods and services as the Company satisfies its performance obligations. Accordingly, the Company recognizes revenue over time using the cost-to-cost method to measure performance progress. The Company may, however, utilize a measure of progress other than cost-to-cost, such as a labor-based measure of progress, or recognize revenue at the point in time at which control is transferred to the customer if the terms and conditions of the arrangement require such accounting. When using the cost-to-cost method to measure performance progress, certain contracts may include costs that are not representative of performance progress, such as large upfront purchases of uninstalled materials, unexpected waste, or inefficiencies. In these cases, the Company adjusts its measure of progress to exclude such costs, with the goal of better reflecting the transfer of control over the related goods or services to the customer and recognizing revenue only to the extent of the costs incurred that reflect the Company's performance under the contract. A performance obligation is a promise to transfer a distinct good or service to the customer and is the unit of account for which revenue is recognized. To determine the proper revenue recognition method, consideration is given to whether two or more contracts should be combined and accounted for as one contract and whether a single contract consists of more than one performance obligation. For contracts with multiple performance obligations, the contract transaction price is allocated to each performance obligation using an estimate of the standalone selling price based upon expected cost plus a margin at contract inception, which is generally the price disclosed in the contract. Contracts are often modified to account for changes in contract specifications and requirements. 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 amount of revenue recognized as the Company satisfies performance obligations associated with contracts with customers is based upon the determination of transaction price. Transaction price reflects the amount of consideration to which the Company expects to be entitled for performance under the terms and conditions of the relevant contract and may reflect fixed and variable components, including shareline incentive fees whereby the value of the contract is variable based upon the amount of costs incurred, as well as other incentive fees based upon achievement of contractual schedule commitments or other specified criteria in the contract. Shareline incentive fees are determined based upon the formula under the relevant contract using the Company’s estimated cost to complete each period. The Company generally utilizes a most likely amount approach to estimate variable consideration. In all such instances, the estimated revenues represent those amounts for which the Company believes a significant reversal of revenue is not probable.
Contract Estimates	Contract Estimates - In estimating contract costs, the Company utilizes a profit-booking rate based upon performance expectations that takes into consideration a number of assumptions and estimates regarding risks related to technical requirements, feasibility, schedule, and contract costs. Management performs periodic reviews of the contracts to evaluate the underlying risks, which may increase the profit-booking rate as the Company is able to mitigate and retire such risks. Conversely, if the Company is not able to retire these risks, cost estimates may increase, resulting in a lower profit-booking rate. The cost estimation process requires significant judgment and is based upon the professional knowledge and experience of the Company’s engineers, program managers, and financial professionals. Factors considered in estimating the work to be completed and ultimate contract recovery include the availability, productivity, and cost of labor, the nature and complexity of the work to be performed, the effect of change orders, the availability of materials, the effect of any performance delays, the availability and timing of funding from the customer, and the recoverability of any claims included in the estimates to complete. Changes in estimates of sales, costs, and profits on a performance obligation are recognized using the cumulative catch-up method of accounting, which recognizes in the current period the cumulative effect of the changes in current and prior periods. A significant change in an estimate on one or more contracts in a period could have a material effect on the Company's unaudited condensed consolidated financial position or results of operations for that period. When estimates of total costs to be incurred exceed estimates of total revenue to be earned on a performance obligation related to a complex, construction-type contract, a provision for the entire loss on the performance obligation is recognized in the period the loss is determined.
Accounts Receivable	Accounts Receivable - Accounts receivable include amounts related to any unconditional Company right to receive consideration and are presented as receivables in the unaudited condensed consolidated statement of financial position, separate from other contract balances. Accounts receivable are comprised of amounts billed and currently due from customers. The Company reports accounts receivable net of an allowance for doubtful accounts. Because the Company's accounts receivable are primarily with the U.S. Government or with companies acting as a contractor to the U.S. Government, the Company does not have material exposure to accounts receivable credit risk.
Contract Assets	Contract Assets - 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, including retention amounts. Contract assets are classified as current assets and, in accordance with industry practice, include amounts that may be billed and collected beyond one year due to the long term nature of many of the Company's contracts. Contract assets are transferred to accounts receivable when the right to consideration becomes unconditional.
Contract Liabilities	Contract Liabilities - Contract liabilities are comprised of advance payments, billings in excess of revenues, and deferred revenue amounts. Such advances are generally not considered a significant financing component, because they are utilized to pay for contract costs within a one year period. Contract liability amounts are recognized as revenue once the requisite performance progress has occurred.
Inventoried Costs	Inventoried Costs - Inventoried costs primarily relate to company owned raw materials, which are stated at the lower of cost or net realizable value, generally using the average cost method, and costs capitalized pursuant to applicable provisions of the Federal Acquisition Regulation ("FAR") and Cost Accounting Standards ("CAS"). Under the Company's U.S. Government contracts, the customer asserts title to, or a security interest in, inventories related to such contracts as a result of contract advances, performance-based payments, and progress payments. In accordance with industry practice, inventoried costs are classified as current assets and include amounts related to contracts having production cycles longer than one year.
Warranty Costs	Warranty Costs - Certain of the Company’s contracts contain assurance-type warranty provisions, which generally promise that the service or vessel will comply with agreed upon specifications. In such instances, the Company accrues the estimated loss by a charge to income in the relevant period. In limited circumstances,the Company's complex construction type contracts may provide the customer with an option to purchase a warranty or provide an extended assurance service coupled with the primary assurance warranty. In such cases, the Company accounts for the warranty as a separate performance obligation to the extent it is material within the context of the contract. Warranty liabilities are reported within other current liabilities and are not material.
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, 2018 , the Company recognized cash grant benefits of approximately $19 million in other long-term liabilities in the unaudited condensed consolidated statements of financial position. For the six months ended June 30, 2017 , the Company recognized no grant benefits.
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. The Company maintains multiple grantor trusts established to fund certain non-qualified pension plans. These trusts were valued at $104 million and $94 million as of June 30, 2018 , and December 31, 2017 , respectively, and are presented within miscellaneous other assets within the unaudited condensed consolidated statements of financial position. These trusts consist primarily of available-for-sale investments in marketable securities, which are held at fair value within Level 1 of the fair value hierarchy.
Related Party Transactions	Related Party Transactions - On March 29, 2011, HII entered into a Separation and Distribution Agreement (the "Separation Agreement") with its former parent company, Northrop Grumman Corporation ("Northrop Grumman"), and Northrop Grumman's subsidiaries (Northrop Grumman Shipbuilding, Inc. and Northrop Grumman Systems Corporation), pursuant to which HII was legally and structurally separated from Northrop Grumman. As of December 31, 2017 , the Company was due $8 million from Northrop Grumman under spin-off related agreements. For the six months ended June 30, 2018 , the Company received $8 million from Northrup Grumman under spin-off related agreements. As of each of June 30, 2018 , and December 31, 2017 , the Company had $84 million outstanding under Industrial Revenue Bonds issued by the Mississippi Business Finance Corporation. Prior to the spin-off, repayment of principal and interest was guaranteed by Northrop Grumman Systems Corporation. The guaranty remains in effect, and the Company has agreed to indemnify Northrop Grumman Systems Corporation for any losses related to the guaranty.

Accounting Standards Updates (T

Accounting Standards Updates (Tables)	6 Months Ended
	Jun. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block]	The following table is a schedule of the impact of adoption of ASU 2017-07 for the three and six months ended June 30, 2017 . The Company has reclassified the following line items on its previously issued consolidated financial statements to conform to the current year presentation. As Previously Reported As Presented Three Months Ended Six Months Ended Three Months Ended Six Months Ended (in millions, except per share amounts) June 30, 2017 June 30, 2017 June 30, 2017 June 30, 2017 Cost of product sales $ 1,104 $ 2,174 $ 1,061 $ 2,088 Cost of service revenues $ 385 $ 748 $ 375 $ 728 General and administrative expenses $ 133 $ 262 $ 182 $ 360 Operating income (loss) $ 237 $ 401 $ 241 $ 409 Non-operating retirement expense $ — $ — $ (4 ) $ (8 )

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2018
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, 2018 and 2017 , were as follows: ($ in millions) Benefit Plans Other Total Balance as of March 31, 2017 $ (935 ) $ — $ (935 ) Other comprehensive income (loss) before reclassifications — 3 3 Amounts reclassified from accumulated other comprehensive income (loss) Amortization of net actuarial loss (gain) 1 23 — 23 Tax benefit (expense) for items of other comprehensive income (9 ) (1 ) (10 ) Net current period other comprehensive income (loss) 14 2 16 Balance as of June 30, 2017 (921 ) 2 (919 ) Balance as of March 31, 2018 (1,095 ) (3 ) (1,098 ) Other comprehensive income (loss) before reclassifications — (2 ) (2 ) Amounts reclassified from accumulated other comprehensive income (loss) Amortization of net actuarial loss (gain) 1 21 — 21 Tax benefit (expense) for items of other comprehensive income (6 ) — (6 ) Net current period other comprehensive income (loss) 15 (2 ) 13 Balance as of June 30, 2018 $ (1,080 ) $ (5 ) $ (1,085 ) ($ in millions) Benefit Plans Other Total Balance as of December 31, 2016 $ (948 ) $ (3 ) $ (951 ) Other comprehensive income (loss) before reclassifications — 7 7 Amounts reclassified from accumulated other comprehensive income (loss) Amortization of prior service cost (credit) 1 (1 ) — (1 ) Amortization of net actuarial loss (gain) 1 46 — 46 Tax benefit (expense) for items of other comprehensive income (18 ) (2 ) (20 ) Net current period other comprehensive income (loss) 27 5 32 Balance as of June 30, 2017 (921 ) 2 (919 ) Balance as of December 31, 2017 (906 ) 6 (900 ) Other comprehensive income (loss) before reclassifications — (2 ) (2 ) Amounts reclassified from accumulated other comprehensive income (loss) Amortization of prior service cost (credit) 1 1 — 1 Amortization of net actuarial loss (gain) 1 40 — 40 Tax benefit (expense) for items of other comprehensive income (11 ) — (11 ) Net current period other comprehensive income (loss) 30 (2 ) 28 Effect of Accounting Standards Update 2016-01 2 — (11 ) (11 ) Effect of Accounting Standards Update 2018-02 3 (204 ) 2 (202 ) Balance as of June 30, 2018 $ (1,080 ) $ (5 ) $ (1,085 ) 1 These accumulated comprehensive income (loss) components are included in the computation of net periodic benefit cost. See Note 16: Employee Pension and Other Postretirement Benefits. The tax benefit associated with amounts reclassified from accumulated other comprehensive income (loss) for the three months ended June 30, 2018 and 2017 , was $6 million and $9 million , respectively. The tax benefit associated with amounts reclassified from accumulated other comprehensive income (loss) for the six months ended June 30, 2018 and 2017 , was $11 million and $18 million , respectively. 2 The Company adopted ASU 2016-01 as of January 1, 2018. Accordingly, accumulated other comprehensive income of $11 million related to available-for-sale securities, net of $4 million tax expense, was reclassified to retained earnings. 3 The Company adopted ASU 2018-02 as of January 1, 2018. Accordingly, stranded tax effects of $202 million related to the Tax Act were reclassified to retained earnings.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
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) 2018 2017 2018 2017 Net earnings (loss) $ 239 $ 147 $ 395 $ 266 Weighted-average common shares outstanding 44.2 45.7 44.5 46.0 Net dilutive effect of stock options and awards 0.1 0.1 0.1 0.1 Dilutive weighted-average common shares outstanding 44.3 45.8 44.6 46.1 Earnings (loss) per share - basic $ 5.41 $ 3.22 $ 8.88 $ 5.78 Earnings (loss) per share - diluted $ 5.40 $ 3.21 $ 8.86 $ 5.77

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2018
Revenue Recognition and Deferred 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. See Note 9: Segment Information. 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, 2018 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 577 $ 903 $ 19 $ — $ 1,499 Service revenues 52 277 192 — 521 Intersegment — 3 32 (35 ) — Sales and service revenues $ 629 $ 1,183 $ 243 $ (35 ) $ 2,020 Customer Type Federal $ 629 $ 1,180 $ 141 $ — $ 1,950 Commercial — — 69 — 69 State and local government agencies — — 1 — 1 Intersegment — 3 32 (35 ) — Sales and service revenues $ 629 $ 1,183 $ 243 $ (35 ) $ 2,020 Contract Type Firm fixed-price $ 18 $ 1 $ 41 $ — $ 60 Fixed-price incentive 528 480 — — 1,008 Cost-type 83 699 92 — 874 Time and materials — — 78 — 78 Intersegment — 3 32 (35 ) — Sales and service revenues $ 629 $ 1,183 $ 243 $ (35 ) $ 2,020 Six Months Ended June 30, 2018 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 1,111 $ 1,725 $ 33 $ — $ 2,869 Service revenues 103 537 385 — 1,025 Intersegment — 3 58 (61 ) — Sales and service revenues $ 1,214 $ 2,265 $ 476 $ (61 ) $ 3,894 Customer Type Federal $ 1,214 $ 2,262 $ 292 $ — $ 3,768 Commercial — — 125 — 125 State and local government agencies — — 1 — 1 Intersegment — 3 58 (61 ) — Sales and service revenues $ 1,214 $ 2,265 $ 476 $ (61 ) $ 3,894 Contract Type Firm fixed-price $ 42 $ 4 $ 81 $ — $ 127 Fixed-price incentive 1,014 897 1 — 1,912 Cost-type 158 1,361 185 — 1,704 Time and materials — — 151 — 151 Intersegment — 3 58 (61 ) — Sales and service revenues $ 1,214 $ 2,265 $ 476 $ (61 ) $ 3,894 Three Months Ended Six Months Ended ($ in millions) 2018 2018 Major Programs Amphibious assault ships $ 327 $ 615 Surface combatants and coast guard cutters 302 598 Other — 1 Total Ingalls 629 1,214 Aircraft carriers 654 1,241 Submarines 386 745 Other 143 279 Total Newport News 1,183 2,265 Government and energy services 201 395 Oil and gas services 42 81 Total Technical Solutions 243 476 Intersegment eliminations (35 ) (61 ) Sales and service revenues $ 2,020 $ 3,894

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Segment operating results	The following table presents segment results for the three and six months ended June 30, 2018 and 2017 : Three Months Ended Six Months Ended ($ in millions) 2018 2017 2018 2017 Sales and Service Revenues Ingalls $ 629 $ 639 $ 1,214 $ 1,189 Newport News 1,183 1,001 2,265 1,972 Technical Solutions 243 244 476 469 Intersegment eliminations (35 ) (26 ) (61 ) (48 ) Sales and service revenues $ 2,020 $ 1,858 $ 3,894 $ 3,582 Operating Income (Loss) Ingalls $ 83 $ 98 $ 147 $ 164 Newport News 91 80 142 152 Technical Solutions 7 9 9 (9 ) Segment operating income (loss) 181 187 298 307 Non-segment factors affecting operating income (loss) Operating FAS/CAS Adjustment 73 53 145 106 Non-current state income taxes 3 1 5 (4 ) Operating income (loss) $ 257 $ 241 $ 448 $ 409
Segment assets	The following table presents the Company's assets by segment. ($ in millions) June 30 December 31 Assets Ingalls $ 1,474 $ 1,385 Newport News 3,571 3,350 Technical Solutions 671 642 Corporate 659 997 Total assets $ 6,375 $ 6,374

Inventoried Costs, Net (Tables)

Inventoried Costs, Net (Tables)	6 Months Ended
	Jun. 30, 2018
Inventory Disclosure [Abstract]
Inventoried costs, net	Inventoried costs were comprised of the following: ($ in millions) June 30 December 31 Production costs of contracts in process 1 $ 75 $ 90 Raw material inventory 99 93 Total inventoried costs, net $ 174 $ 183 1 Includes amounts capitalized p ursuant to applicable provisions of the FAR and Cost Accounting Standards.

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consisted of the following: ($ in millions) June 30 December 31 Senior notes due November 15, 2025, 5.000% 600 600 Senior notes due December 1, 2027, 3.483% 600 600 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 (24 ) (26 ) Total long-term debt $ 1,281 $ 1,279

Employee Pension and Other Po34

Employee Pension and Other Postretirement Benefits (Tables)	6 Months Ended
	Jun. 30, 2018
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, 2018 and 2017 , were as follows: Three Months Ended Six Months Ended Pension Benefits Other Benefits Pension Benefits Other Benefits ($ in millions) 2018 2017 2018 2017 2018 2017 2018 2017 Components of Net Periodic Benefit Cost Service cost $ 40 $ 36 $ 2 $ 2 $ 79 $ 71 $ 4 $ 5 Interest cost 63 66 5 6 127 133 10 12 Expected return on plan assets (108 ) (91 ) — — (215 ) (182 ) — — Amortization of prior service cost (credit) 6 4 (6 ) (4 ) 12 8 (11 ) (9 ) Amortization of net actuarial loss (gain) 21 24 — (1 ) 41 48 (1 ) (2 ) Net periodic benefit cost $ 22 $ 39 $ 1 $ 3 $ 44 $ 78 $ 2 $ 6
Schedule of Defined Benefit Plans Disclosures, Cash Contributions	The Company made the following contributions to its pension and other postretirement plans for the six months ended June 30, 2018 and 2017 : Six Months Ended ($ in millions) 2018 2017 Pension plans Qualified minimum $ — $ — Discretionary Qualified 84 91 Non-qualified 3 3 Other benefit plans 16 17 Total contributions $ 103 $ 111

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Status of Stock Awards	The following table summarizes the status of the Company's outstanding stock awards as of June 30, 2018 . Stock Awards (in thousands) Weighted-Average Grant Date Fair Value Weighted-Average Remaining Contractual Term (in years) Total stock awards 403 $ 174.45 1.1

Description of Business (Narrat

Description of Business (Narrative) (Details)	6 Months Ended
	Jun. 30, 2018segments
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, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred gain on receipt of property	$ 19
Assets held in rabbi trusts	104	$ 94
Related Party Transaction [Line Items]
Long-term Debt	1,281	1,279
Mississippi Economic Development Revenue Bonds Due May 1, 2024, 7.81% | Bonds
Related Party Transaction [Line Items]
Long-term Debt	84	84
Spin-off Related Agreements [Member] | Former Parent [Member]
Related Party Transaction [Line Items]
Receivable related to spin-off agreements		$ 8
Cash received related to spin-off agreements	$ 8

Account Standards Updates (Narr

Account Standards Updates (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense (benefit)	$ 23	$ 71	$ 62	$ 99
Product sales	$ 1,499	$ 1,397	$ 2,869	$ 2,697
Diluted earnings (loss) per share	$ 5.40	$ 3.21	$ 8.86	$ 5.77
Operating Income (Loss)	$ 257	$ 241	$ 448	$ 409
Net earnings (loss)	$ 239	$ 147	395	$ 266
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retention Receivable					$ 64
Cumulative Effect on Retained Earnings, Net of Tax					5
Income tax expense (benefit)					$ 1
Product sales			$ 1
Diluted earnings (loss) per share	$ 0.01		$ 0.01
Operating Income (Loss)			$ 1
Net earnings (loss)			$ 1
Maximum | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product sales	$ 1
Operating Income (Loss)	1
Net earnings (loss)	$ 1

Accounting Standards Updates 39

Accounting Standards Updates (Table) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Item Effected [Line Items]
Cost of product sales	$ 1,147	$ 1,061	$ 2,210	$ 2,088
Cost of service revenues	421	375	853	728
General and administrative expenses	209	182	401	360
Operating Income (Loss)	257	241	448	409
Non-operating retirement expense	$ 19	(4)	$ 37	(8)
Previous Accounting Guidance [Member]
Item Effected [Line Items]
Cost of product sales		1,104		2,174
Cost of service revenues		385		748
General and administrative expenses		133		262
Operating Income (Loss)		$ 237		$ 401

Avondale (Narrative) (Details)

Avondale (Narrative) (Details) $ in Millions	Jun. 30, 2018USD ($)
Restructuring Cost and Reserve
Restructuring and Related Costs, Allowable	$ 251
Facility closing | Avondale Wind Down
Restructuring Cost and Reserve
Assets held for sale	$ 41

Gulfport (Narrative) (Details)

Gulfport (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2015	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve
Proceeds from disposition of assets		$ 3	$ 1
Facility closing | Gulfport
Restructuring Cost and Reserve
Total costs incurred relating to restructuring and shutdown		54
Accelerated depreciation cost		52
Other restructuring cost		$ 2
Proceeds from disposition of assets	$ 32
Gain on Disposition	$ 9

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Nov. 07, 2017	Mar. 31, 2017	Dec. 31, 2016	Oct. 31, 2015
Stockholders' Equity [Line Items]
Amount authorized for stock repurchase program							$ 2,200			$ 1,200
Repurchased shares of treasury stock			1,805,667	1,065,737
Treasury stock activity			$ 413	$ 210
Treasury Stock, Value Acquired, Not Yet Settled for Cash			7	$ 3
Treasury Stock Value Previously Acquired, settled for cash			$ 2
Dividends declared per share	$ 0.72	$ 0.60	$ 1.44	$ 1.20
Dividends paid			$ 64	$ 55
Accumulated other comprehensive income (loss)	$ (1,085)	$ (919)	(1,085)	(919)	$ (1,098)	$ (900)		$ (935)	$ (951)
Benefit Plans
Stockholders' Equity [Line Items]
Accumulated other comprehensive income (loss)	(1,080)	(921)	(1,080)	(921)	(1,095)	(906)		$ (935)	(948)
Other
Stockholders' Equity [Line Items]
Accumulated other comprehensive income (loss)	$ (5)	$ 2	$ (5)	$ 2	$ (3)	$ 6			$ (3)

Stockholders' Equity Accumulate

Stockholders' Equity Accumulated Other Comprehensive Income (Loss) (Table) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning		$ (1,098)	$ (935)	$ (900)	$ (951)	$ (951)
Other comprehensive income (loss) before reclassifications		(2)	3	(2)	7
Amortization of prior service cost (credit)	[1]			1	(1)
Amortization of net actuarial loss (gain)	[1]	21	23	40	46
Tax benefit (expense) for items of other comprehensive income		(6)	(10)	(11)	(20)
Other comprehensive income (loss), net of tax		13	16	28	32
Effect of Accounting Standards Update 2016-01	[2]			(11)
Effect of Accounting Standards Update 2018-02	[3]			(202)
Balance, ending		(1,085)	(919)	(1,085)	(919)	(900)
Income tax expense (benefit)		23	71	62	99
Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning		(1,095)	(935)	(906)	(948)	(948)
Amortization of prior service cost (credit)	[1]			1	(1)
Amortization of net actuarial loss (gain)	[1]	21	23	40	46
Tax benefit (expense) for items of other comprehensive income		(6)	(9)	(11)	(18)
Other comprehensive income (loss), net of tax		15	14	30	27
Effect of Accounting Standards Update 2018-02	[3]			(204)
Balance, ending		(1,080)	(921)	(1,080)	(921)	(906)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning		(3)		6	(3)	(3)
Other comprehensive income (loss) before reclassifications		(2)	3	(2)	7
Tax benefit (expense) for items of other comprehensive income			(1)		(2)
Other comprehensive income (loss), net of tax		(2)	2	(2)	5
Effect of Accounting Standards Update 2016-01	[2]			(11)
Effect of Accounting Standards Update 2018-02	[3]			2
Balance, ending		(5)	2	(5)	2	$ 6
Reclassification out of AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)		$ 6	$ 9	11	$ 18
Accounting Standards Update 2016-01 [Member] | Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)				$ 4
[1]	These accumulated comprehensive income (loss) components are included in the computation of net periodic benefit cost. See Note 16: Employee Pension and Other Postretirement Benefits. The tax benefit associated with amounts reclassified from accumulated other comprehensive income (loss) for the three months ended June 30, 2018 and 2017, was $6 million and $9 million, respectively. The tax benefit associated with amounts reclassified from accumulated other comprehensive income (loss) for the six months ended June 30, 2018 and 2017, was $11 million and $18 million, respectively.
[2]	The Company adopted ASU 2016-01 as of January 1, 2018. Accordingly, accumulated other comprehensive income of $11 million related to available-for-sale securities, net of $4 million tax expense, was reclassified to retained earnings.
[3]	The Company adopted ASU 2018-02 as of January 1, 2018. Accordingly, stranded tax effects of $202 million related to the Tax Act were reclassified to retained earnings.

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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Net earnings (loss)	$ 239	$ 147	$ 395	$ 266
Weighted-average common shares outstanding (in shares)	44.2	45.7	44.5	46
Net dilutive effect of stock options and awards (in shares)	0.1	0.1	0.1	0.1
Dilutive weighted-average common shares outstanding (in shares)	44.3	45.8	44.6	46.1
Earnings (loss) per share - basic (in dollars per share)	$ 5.41	$ 3.22	$ 8.88	$ 5.78
Earnings (loss) per share - diluted (in dollars per share)	$ 5.40	$ 3.21	$ 8.86	$ 5.77

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
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	0.3	0.3	0.3	0.4

Revenue (Table) (Details)

Revenue (Table) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Product sales	$ 1,499	$ 1,397	$ 2,869	$ 2,697
Service revenues	521	461	1,025	885
Sales and service revenues	2,020	1,858	3,894	3,582
Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	60		127
Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,008		1,912
Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	874		1,704
Time-and-materials
Disaggregation of Revenue [Line Items]
Sales and service revenues	78		151
Ingalls
Disaggregation of Revenue [Line Items]
Product sales	577		1,111
Service revenues	52		103
Sales and service revenues	629	639	1,214	1,189
Ingalls | Amphibious assault ships
Disaggregation of Revenue [Line Items]
Sales and service revenues	327		615
Ingalls | Surface combatants and coast guard cutters
Disaggregation of Revenue [Line Items]
Sales and service revenues	302		598
Ingalls | Other programs
Disaggregation of Revenue [Line Items]
Sales and service revenues			1
Ingalls | Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	18		42
Ingalls | Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	528		1,014
Ingalls | Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	83		158
Newport News
Disaggregation of Revenue [Line Items]
Product sales	903		1,725
Service revenues	277		537
Intersegment	3		3
Sales and service revenues	1,183	1,001	2,265	1,972
Newport News | Other programs
Disaggregation of Revenue [Line Items]
Sales and service revenues	143		279
Newport News | Aircraft carriers
Disaggregation of Revenue [Line Items]
Sales and service revenues	654		1,241
Newport News | Submarines
Disaggregation of Revenue [Line Items]
Sales and service revenues	386		745
Newport News | Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	1		4
Newport News | Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	480		897
Newport News | Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	699		1,361
Newport News | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	3		3
Intersegment Elimination
Disaggregation of Revenue [Line Items]
Intersegment	(35)		(61)
Sales and service revenues	(35)	(26)	(61)	(48)
Intersegment Elimination | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	(35)		(61)
Technical Solutions
Disaggregation of Revenue [Line Items]
Product sales	19		33
Service revenues	192		385
Intersegment	32		58
Sales and service revenues	243	$ 244	476	$ 469
Technical Solutions | Government and energy services
Disaggregation of Revenue [Line Items]
Sales and service revenues	201		395
Technical Solutions | Oil and gas services
Disaggregation of Revenue [Line Items]
Sales and service revenues	42		81
Technical Solutions | Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	41		81
Technical Solutions | Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues			1
Technical Solutions | Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	92		185
Technical Solutions | Time-and-materials
Disaggregation of Revenue [Line Items]
Sales and service revenues	78		151
Technical Solutions | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	32		58
Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,950		3,768
Federal | Ingalls
Disaggregation of Revenue [Line Items]
Sales and service revenues	629		1,214
Federal | Newport News
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,180		2,262
Federal | Technical Solutions
Disaggregation of Revenue [Line Items]
Sales and service revenues	141		292
Commercial
Disaggregation of Revenue [Line Items]
Sales and service revenues	69		125
Commercial | Technical Solutions
Disaggregation of Revenue [Line Items]
Sales and service revenues	69		125
State and local government agencies
Disaggregation of Revenue [Line Items]
Sales and service revenues	1		1
State and local government agencies | Technical Solutions
Disaggregation of Revenue [Line Items]
Sales and service revenues	1		1
Intersegment | Newport News
Disaggregation of Revenue [Line Items]
Sales and service revenues	3		3
Intersegment | Intersegment Elimination
Disaggregation of Revenue [Line Items]
Sales and service revenues	(35)		(61)
Intersegment | Technical Solutions
Disaggregation of Revenue [Line Items]
Sales and service revenues	$ 32		$ 58

Revenue (Narrative) (Details)

Revenue (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue Recognition and Deferred Revenue [Abstract]
Revenue, Remaining Performance Obligation	$ 21,200		$ 21,200
Revenue, performance obligation, recognition percentage, year two			50.00%
Revenue, performance obligation, recognition percentage, year four			35.00%
Increase (Decrease) in Net Contract Assets			$ 255
Contract with Customer, Liability, Revenue Recognized	1		87
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate
Increase (decrease) in operating income due to net cumulative catch-up adjustments	$ 37	$ 60	$ 65	$ 86
Increase (decrease) in diluted earnings per share due to net cumulative catch-up adjustments	$ 0.66	$ 0.85	$ 1.15	$ 1.21
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				$ 30
Increase (decrease) in diluted earnings per share due to net cumulative catch-up adjustments				$ 0.42

Segment Information (Narrative)

Segment Information (Narrative) (Details)	6 Months Ended
	Jun. 30, 2018segments
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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Sales and Service Revenues
Sales and service revenue	$ 2,020	$ 1,858	$ 3,894	$ 3,582
Operating Income (Loss)
Operating income (loss)	257	241	448	409
Operating Segments
Operating Income (Loss)
Operating income (loss)	181	187	298	307
Ingalls
Sales and Service Revenues
Sales and service revenue	629	639	1,214	1,189
Operating Income (Loss)
Operating income (loss)	83	98	147	164
Newport News
Sales and Service Revenues
Sales and service revenue	1,183	1,001	2,265	1,972
Operating Income (Loss)
Operating income (loss)	91	80	142	152
Technical Solutions
Sales and Service Revenues
Sales and service revenue	243	244	476	469
Operating Income (Loss)
Operating income (loss)	7	9	9	(9)
Intersegment Elimination
Sales and Service Revenues
Sales and service revenue	(35)	(26)	(61)	(48)
Non-segment factors affecting operating income (loss)
Non-segment factors affecting operating income (loss)
Operating FAS/CAS Adjustment	73	53	145	106
Non-current state income taxes	$ 3	$ 1	$ 5	$ (4)

Segment Assets (Table) (Details

Segment Assets (Table) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information
Assets	$ 6,375	$ 6,374
Ingalls
Segment Reporting Information
Assets	1,474	1,385
Newport News
Segment Reporting Information
Assets	3,571	3,350
Technical Solutions
Segment Reporting Information
Assets	671	642
Corporate
Segment Reporting Information
Assets	$ 659	$ 997

Inventoried Costs, Net (Table)

Inventoried Costs, Net (Table) (Details) - USD ($) $ in Millions		Jun. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Production costs of contracts in process	[1]	$ 75	$ 90
Raw material inventory		99	93
Total inventoried costs, net		$ 174	$ 183
[1]	Includes amounts capitalized pursuant to applicable provisions of the FAR and Cost Accounting Standards.

Goodwill (Narrative) (Details)

Goodwill (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Goodwill
Accumulated goodwill impairment losses	$ 2,877	$ 2,877
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	$ 122	$ 122

Other Intangible Assets (Narrat

Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangibles	$ 9	$ 9	$ 18	$ 20
Aggregate weighted-average amortization period			40 years
Expected amortization for purchased intangible assets:
Expected amortization, 2018	36		$ 36
Expected amortization, 2019	32		32
Expected amortization, 2020	28		28
Expected amortization, 2021	26		26
Expected amortization, 2022	$ 24		$ 24

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate		8.80%	32.60%	13.60%	27.10%
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%		35.00%
Effect of Accounting Standards Update 2018-02	[1]			$ (202)
Unrecognized Tax Benefits, Period Increase (Decrease)		$ 15		15
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		$ 1		1
Reduction in income tax rate [Member]
Income Tax Contingency [Line Items]
Change in Deferred Tax Assets due to 2017 Tax Act						$ (252)
Change in Deferred Tax Liabilities due to 2017 Tax Act						(196)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount						56
Acceleration of Depreciation [Member]
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount						8
Change in Current Income Tax Payable due to 2017 Tax Act						$ 8
Executive Compensation [Member]
Income Tax Contingency [Line Items]
Compensation Tax Deduction Limitation				$ 1
[1]	The Company adopted ASU 2018-02 as of January 1, 2018. Accordingly, stranded tax effects of $202 million related to the Tax Act were reclassified to retained earnings.

Schedule of Long-term debt (Tab

Schedule of Long-term debt (Table) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt	$ 1,281	$ 1,279
Less unamortized debt issuance costs	(24)	(26)
Senior Notes
Debt Instrument [Line Items]
Less unamortized debt issuance costs	(15)	(15)
Senior Notes | Senior Notes Due November 15, 2025, 5.000%
Debt Instrument [Line Items]
Long-term debt	$ 600	$ 600
Debt Instrument, Interest Rate, Stated Percentage	5.00%	5.00%
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%
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	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Credit Facility
Unamortized Debt Issuance Expense	$ 24	$ 26
Revolving Credit Facility
Credit Facility
Credit facility revolver	$ 1,250
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) [Member] | Minimum
Credit Facility
Spread on variable rate	1.125%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) [Member] | Maximum
Credit Facility
Spread on variable rate	1.50%
Revolving Credit Facility | Base Rate [Member]
Credit Facility
Commitment fee, based on unused capacity	0.25%
Revolving Credit Facility | Base Rate [Member] | Minimum
Credit Facility
Spread on variable rate	0.20%
Revolving Credit Facility | Base Rate [Member] | Maximum
Credit Facility
Spread on variable rate	0.30%
Letter of Credit
Credit Facility
Credit facility revolver	$ 500
Standby Letters of Credit
Credit Facility
Letters of credit issued but undrawn	17
HII Credit Facility | Revolving Credit Facility
Credit Facility
Remaining unutilized amount	1,233
Unamortized Debt Issuance Expense	$ 9	$ 11
Debt Instrument, Contractual Term	5 years
Debt Instrument, Description of Variable Rate Basis	LIBOR

Debt Senior Note (Narrative) (D

Debt Senior Note (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term Debt	$ 1,281	$ 1,279
Unamortized Debt Issuance Expense	24	26
Senior Notes
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	15	15
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 December 15, 2021, 5.000%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.00%
Senior Notes | Senior Notes Due November 15, 2025, 5.000%
Debt Instrument [Line Items]
Long-term Debt	$ 600	$ 600
Debt Instrument, Interest Rate, Stated Percentage	5.00%	5.00%

Debt Revenue Bonds (Narrative)

Debt Revenue Bonds (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term Debt	$ 1,281	$ 1,279
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%

Fair Value of Long Term Debt (N

Fair Value of Long Term Debt (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Long-term Debt, Other Disclosures [Abstract]
Fair value of long term debt	$ 1,309	$ 1,361

Investigations, Claims, and L60

Investigations, Claims, and Litigation (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018USD ($)frigates	Jun. 30, 2017USD ($)
Bolivarian Republic of Venezuela
Loss Contingencies
Number of Foreign Built Frigates | frigates	2
Arbitral statement claim	$ 151
Litigation counter claim [Member] | Bolivarian Republic of Venezuela
Loss Contingencies
Arbitral statement claim	$ 22
Ingalls Timecharging Investigation
Loss Contingencies
Contract receivable retainage initially withheld		$ 24
United States Navy | Ingalls Timecharging Investigation
Loss Contingencies
Contract receivable retainage initially withheld		18.2
Contract Receivable Retainage		4.7
United States Coast Guard | Ingalls Timecharging Investigation
Loss Contingencies
Contract receivable retainage initially withheld		5.8
Contract Receivable Retainage		$ 3.6

Commitments and Contingencies (

Commitments and Contingencies (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018USD ($)
Commitments and Contingencies
Probable future cost for envionmental remediation	$ 1
Entity Number of Employees	39,000
Surety Bonds Outstanding
Commitments and Contingencies
Surety bonds outstanding	$ 273
Standby Letters of Credit
Commitments and Contingencies
Letters of credit issued but undrawn	$ 17
Minimum
Commitments and Contingencies
Period Covered by Collective Bargaining Agreements	3 years
Maximum
Commitments and Contingencies
Period Covered by Collective Bargaining Agreements	5 years
Number of Collective Bargaining Unit, Total [Member]
Commitments and Contingencies
Concentration Risk, Labor Subject to Collective Bargaining Arrangements	9
Workforce Subject To Collective Bargaining Arrangements, Percent [Member]
Commitments and Contingencies
Concentration Risk, Labor Subject to Collective Bargaining Arrangements	0.5
Number of Collective Bargaining Unit, Newport News [Member]
Commitments and Contingencies
Concentration Risk, Labor Subject to Collective Bargaining Arrangements	4
Number of Collective Bargaining Unit, Pascagoula and Gulfport [Member]
Commitments and Contingencies
Concentration Risk, Labor Subject to Collective Bargaining Arrangements	5
Hanford Site, Richland, Washington [Member]
Commitments and Contingencies
Entity Number of Employees	35
United Steelworkers [Member] | Newport News | Workforce Subject To Collective Bargaining Arrangements, Percent [Member]
Commitments and Contingencies
Concentration Risk, Labor Subject to Collective Bargaining Arrangements	0.5
Newport News Shipbuilding business systems [Member] | Maximum
Commitments and Contingencies
Potential Contract Receivable Retainage, Percent	5.00%

Employee Pension and Other Po62

Employee Pension and Other Postretirement Benefits Net Benefit Costs (Table) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension Benefits
Defined Benefit Plan Disclosure
Service cost	$ 40	$ 36	$ 79	$ 71
Interest cost	63	66	127	133
Expected return on plan assets	(108)	(91)	(215)	(182)
Amortization of prior service cost (credit)	6	4	12	8
Amortization of net actuarial loss (gain)	21	24	41	48
Net periodic benefit cost	22	39	44	78
Other Benefits
Defined Benefit Plan Disclosure
Service cost	2	2	4	5
Interest cost	5	6	10	12
Amortization of prior service cost (credit)	(6)	(4)	(11)	(9)
Amortization of net actuarial loss (gain)		(1)	(1)	(2)
Net periodic benefit cost	$ 1	$ 3	$ 2	$ 6

Employee Pension and Other Po63

Employee Pension and Other Postretirement Benefits Cash Contributions (Table) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure
Other benefit plans	$ 16	$ 17
Total contributions	103	111
Discretionary Contribution | Qualified
Defined Benefit Plan Disclosure
Pension contributions	84	91
Discretionary Contribution | Non-qualified
Defined Benefit Plan Disclosure
Pension contributions	$ 3	$ 3

Employee Pension and Other Po64

Employee Pension and Other Postretirement Benefits (Narrative) (Details) $ in Millions	Jun. 30, 2018USD ($)
Retirement Benefits [Abstract]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	$ 508

Stock Compensation Plans (Narra

Stock Compensation Plans (Narrative) (Details) - $ / shares shares in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Stock awards
Stock rights, weighted-average grant date fair value	$ 174.45
Stock awards, vested in the period	0.2	0.4
Stock awards, transferred for employee withholding taxes	0.1	0.2
Restricted performance stock rights
Stock awards
Stock rights, granted	0.1	0.1
Stock rights, weighted-average grant date fair value	$ 260.69	$ 219.47
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, 2018$ / sharesshares
Stock awards
Stock awards, outstanding | shares	403
Stock awards, weighted-average grant date fair value | $ / shares	$ 174.45
Stock awards, weighted-average remaining contractual term	1 year 1 month

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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Compensation Expense [Abstract]
Allocated Share-based Compensation Expense	$ 8	$ 14	$ 15	$ 20
Tax benefits for stock-based compensation	2	5	3	8
Stock Awards [Member]
Compensation Expense [Abstract]
Employee Service Share-Based Compensation, Tax Benefit Realized From Issuance Of Instruments Other Than Options		$ 1	$ 7	$ 24
Restricted Stock [Member]
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation expense, period for recognition			1 year 3 months
Restricted performance stock rights
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation expense	37		$ 37
Unrecognized compensation expense, period for recognition			1 year 3 months
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, 2018
Subsidiary Guarantors [Abstract]
Parent ownership percentage of subsidiary guarantors	100.00%