Huntington Ingalls Industries (HII) 10-Q 2 May 19 2019 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 26, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2019
Entity Registrant Name	HUNTINGTON INGALLS INDUSTRIES, INC.
Entity Central Index Key	0001501585
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		41,552,248
Trading Symbol	HII

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Sales and service revenues
Sales and service revenues	$ 2,080	$ 1,874
Cost of sales and service revenues
Income (loss) from operating investments, net	4	2
Other income and gains		2
General and administrative expenses	171	192
Operating income (loss)	161	191
Other income (expense)
Interest expense	(16)	(15)
Non-operating retirement benefit (expense)	3	18
Other, net	1	1
Earnings (loss) before income taxes	149	195
Federal and foreign income taxes	31	39
Net earnings (loss)	$ 118	$ 156
Basic earnings (loss) per share (in dollars per share)	$ 2.85	$ 3.48
Weighted-average common shares outstanding (in shares)	41.4	44.8
Diluted earnings (loss) per share	$ 2.85	$ 3.48
Weighted-average diluted shares outstanding (in shares)	41.4	44.8
Dividends declared per share	$ 0.86	$ 0.72
Other comprehensive income (loss)
Change in unamortized benefit plan costs	$ 25	$ 20
Tax benefit (expense) for items of other comprehensive income	(6)	(5)
Other comprehensive income (loss), net of tax	19	15
Comprehensive income (loss)	137	171
Product [Member]
Sales and service revenues
Sales and service revenues	1,490	1,370
Cost of sales and service revenues
Cost of sales and service revenues	1,258	1,063
Service [Member]
Sales and service revenues
Sales and service revenues	590	504
Cost of sales and service revenues
Cost of sales and service revenues	$ 494	$ 432

Condensed Consolidated Statem_2

Condensed Consolidated Statements Of Financial Position (Unaudited) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 51	$ 240
Accounts receivable, net	375	252
Contract assets	1,250	1,003
Inventoried costs, net	127	128
Prepaid expenses and other current assets	119	122
Total current assets	1,922	1,745
Property, plant, and equipment, net	2,569	2,517
Operating lease assets	220
Goodwill	1,402	1,263
Other intangible assets, net	530	492
Deferred tax assets	140	163
Miscellaneous other assets	217	203
Total assets	7,000	6,383
Current Liabilities
Trade accounts payable	618	562
Accrued employees' compensation	264	248
Current portion of postretirement plan liabilities	131	131
Current portion of workers' compensation liabilities	225	225
Contract liabilities	360	331
Other current liabilities	362	332
Total current liabilities	1,960	1,829
Long-term debt	1,496	1,283
Pension plan liabilities	765	764
Other postretirement plan liabilities	348	348
Workers' compensation liabilities	459	454
Long-term operating lease liabilities	184
Other long-term liabilities	225	189
Total liabilities	5,437	4,867
Commitments and Contingencies (Note 15)
Stockholders' Equity
Common stock	1	1
Additional paid-in capital	1,936	1,954
Retained earnings (deficit)	2,691	2,609
Treasury stock	(1,796)	(1,760)
Accumulated other comprehensive income (loss)	(1,269)	(1,288)
Total stockholders' equity	1,563	1,516
Total liabilities and stockholders' equity	$ 7,000	$ 6,383

Condensed Consolidated Statem_3

Condensed Consolidated Statements Of Financial Position (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 7	$ 9
Accumulated depreciation	1,862	1,829
Accumulated amortization	$ 575	$ 564
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)	53,200,000	53,100,000
Common stock, shares outstanding (in shares)	41,600,000	41,900,000

Condensed Consolidated Statem_4

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net earnings (loss)	$ 118	$ 156
Adjustments to reconcile to net cash provided by (used in) operating activities
Depreciation	41	41
Amortization of purchased intangibles	11	9
Amortization of debt issuance costs	1	1
Provision for doubtful accounts	(2)
Stock-based compensation	5	7
Deferred income taxes	16	5
Change in
Accounts Receivable	(112)	92
Contract assets	(229)	(305)
Inventoried costs	(2)	(5)
Prepaid expenses and other assets	(10)	38
Accounts payable and accruals	147	100
Retiree benefits	25	(20)
Other non-cash transactions, net	2	1
Net cash provided by (used in) operating activities	11	120
Investing Activities
Capital expenditure additions	(110)	(75)
Grant proceeds for capital expenditures	36	2
Acquisitions of businesses, net of cash received	(195)
Proceeds from disposition of assets		3
Net cash provided by (used in) investing activities	(269)	(70)
Financing Activities
Proceeds from revolving credit facility borrowings	1,179
Repayment of revolving credit facility borrowings	(967)
Dividends paid	(36)	(32)
Repurchases of common stock	(84)	(166)
Employee taxes on certain share-based payment arrangements	(23)	(25)
Net cash provided by (used in) financing activities	69	(223)
Change in cash and cash equivalents	(189)	(173)
Cash and cash equivalents, beginning of period	240	701
Cash and cash equivalents, end of period	51	528
Supplemental Cash Flow Disclosure
Cash paid for income taxes		1
Cash paid for interest		1
Non-Cash Investing and Financing Activities
Capital expenditures accrued in accounts payable	$ 34	4
Accrued repurchases of common stock		$ 3

Condensed Consolidated Statem_5

Condensed Consolidated Statements Of Changes In Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Deficit)	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2017	$ 1,758	$ 1	$ 1,942	$ 1,687	$ (972)	$ (900)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	156			156
Dividends declared	(32)			(32)
Additional paid-in capital	(18)		(18)
Other comprehensive income (loss), net of tax	15					15
Treasury stock activity	(166)				(166)
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 Mar. 31, 2018	1,718	1	1,924	2,029	(1,138)	(1,098)
Balance at Dec. 31, 2018	1,516	1	1,954	2,609	(1,760)	(1,288)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	118			118
Dividends declared	(36)			(36)
Additional paid-in capital	(18)		(18)
Other comprehensive income (loss), net of tax	19					19
Treasury stock activity	(36)				(36)
Balance at Mar. 31, 2019	$ 1,563	$ 1	$ 1,936	$ 2,691	$ (1,796)	$ (1,269)

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends declared per share	$ 0.86	$ 0.72

Description of Business

Description of Business	3 Months Ended
	Mar. 31, 2019
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, primarily the Department of Defense ("DoD"). As prime contractor, principal subcontractor, team member, or partner, the Company participates in many high-priority U.S. defense 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, mission driven innovative solutions ("MDIS"), nuclear and environmental, and oil and gas services.

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2019
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. 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, 2018 . 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 - 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. When 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. When 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, 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. In addition, for time and material arrangements, 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. 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 in which 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 three months ended March 31, 2019 , the Company recognized cash grant benefits of approximately $36 million in other long-term liabilities in the unaudited condensed consolidated statements of financial position. For the three months ended March 31, 2018 , the Company recognized cash grant benefits of approximately $2 million in other long-term liabilities in the unaudited condensed consolidated statements of financial position. Fair Value of Financial Instruments - Except for the Company's long-term debt, the carrying amounts of the Company's financial instruments recorded at historical cost approximate fair value due to the short-term nature of the instruments and low credit risk associated with the respective counterparties. The Company maintains multiple grantor trusts to fund certain non-qualified pension plans. These trusts were valued at $121 million and $109 million as of March 31, 2019 , and December 31, 2018 , respectively, and are presented within miscellaneous other assets within the unaudited condensed consolidated statements of financial position. These trusts consist primarily of investments in marketable securities, which are held at fair value within Level 1 of the fair value hierarchy. Leases - The Company determines if an arrangement is a lease at contract inception. A lease exists when a contract conveys to a party the right to control the use of identified property, plant, or equipment for a period of time in exchange for consideration. The Company recognizes a lease liability at the lease commencement date, as the present value of future lease payments, using an estimated rate of interest that the Company would pay to borrow equivalent funds on a collateralized basis. A lease asset is recognized based on the lease liability value and adjusted for any prepaid lease payments, initial direct costs, or lease incentive amounts. The lease term at the commencement date includes any renewal options or termination options when it is reasonably certain that the Company will exercise or not exercise those options, respectively. Right of use assets associated with operating leases are recognized in operating lease assets in the unaudited condensed consolidated statements of financial position. Lease liabilities associated with operating leases are recognized in long-term operating lease liabilities, with short-term lease liability amounts included in other current liabilities in the unaudited condensed consolidated statements of financial position . Rent expense for operating leases is recognized on a straight-line basis over the lease term and included in cost of sales and service revenues on the unaudited condensed consolidated statements of operations and comprehensive income. Variable lease payments are recognized as incurred and include lease operating expenses, which are based on contractual lease terms. The Company elected to exclude from its unaudited condensed consolidated statements of financial position leases having terms of 12 months or less (short-term leases) and elected not to separate lease and non-lease components in the determination of lease payment obligations for its long-term lease contracts. Loan Receivable - The Company holds a loan receivable in connection with a seller financed transaction involving its previously owned Avondale shipyard facility. The receivable is carried at amortized cost in the amount of $38 million , net of a $10 million loan discount, which approximates fair value and is recorded in miscellaneous other assets on the unaudited condensed consolidated statements of financial position. Interest income is recognized on an accrual basis using the effective yield method. The discount is accreted into income using the effective yield method over the estimated life of the loan receivable. 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. For the year ended December 31, 2018, the Company received the $8 million from Northrop Grumman. As of each of March 31, 2019 , and December 31, 2018 , 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	3 Months Ended
	Mar. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Standards Updates	ACCOUNTING STANDARDS UPDATES In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)," which established 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. Expense is recognized in the income statement similar to the recognition of expense under previous accounting guidance. Additional qualitative and quantitative disclosures are required. ASU 2016-02 was effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Prior to the FASB issuing ASU 2018-11 “Leases (Topic 842): Targeted Improvements,” entities were required to use a modified retrospective approach upon adoption to recognize and measure leases at the beginning of the earliest comparative period presented in the financial statements. In January 2018, the FASB issued ASU 2018-01 "Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842," which permitted 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 has not changed. The Company adopted this standard update concurrently with ASU 2016-02. In July 2018, the FASB issued ASU 2018-11, which provides entities the option to initially apply ASU 2016-02 at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Consequently, the comparative periods presented in the financial statements would continue to comply with current GAAP. The Company adopted ASU 2016-02 on January 1, 2019, using the optional transition method. In addition, the Company elected practical expedients permitted under the transition guidance within the new standard, which, among other things, allows it to carry forward historical lease classifications. The Company also elected the hindsight practical expedient to determine the reasonably certain lease term for existing leases. The Company's election of the hindsight practical expedient resulted in lengthening lease terms for certain existing leases. The Company made an accounting policy election not to recognize leases with an initial term of 12 months or less in the unaudited condensed consolidated statements of financial position and to recognize the lease payments in the unaudited condensed consolidated statements of operations and comprehensive income on a straight-line basis over the lease terms. The impact upon adoption was an increase to operating lease assets of $215 million , an increase to short-term operating lease liabilities of $36 million , an increase to long-term operating lease liabilities of $179 million , and no material impact to retained earnings. In August 2018, the FASB issued ASU 2018-13, "Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement," which changes the fair value measurement disclosure requirements of ASC 820. The update includes changes to disclosures regarding valuation techniques and inputs, uncertainty, judgments, and assumptions in fair value measurements, and how changes in fair value measurements affect performance and cash flows. The update is effective for annual reporting periods beginning after December 15, 2019, including interim periods therein. Early adoption is permitted for any eliminated or modified disclosures. The Company is currently evaluating the impact of ASU 2018-13 on its consolidated financial statements and disclosures, accounting processes, and internal controls. In August 2018, the FASB issued ASU 2018-14, “Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans,” which reduces disclosure requirements of Subtopic 715-20 and requires additional disclosure related to weighted-average interest crediting rates and significant gains and losses related to changes in the benefit obligation for the reporting period. The update is effective on a retrospective basis for fiscal years ending after December 15, 2020, with early adoption allowed. The Company is currently evaluating the impact of ASU 2018-14 on its consolidated financial statements and disclosures, accounting processes, and internal controls. Other accounting pronouncements issued but not effective until after December 31, 2019, are not expected to have a material impact on the Company's consolidated financial position, results of operations, or cash flows.

Avondale and Gulfport

Avondale and Gulfport	3 Months Ended
	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Avondale and Gulfport	AVONDALE AND GULFPORT In August and October 2014, the Company completed closure of its Gulfport Composite Center of Excellence in Gulfport, Mississippi and ceased shipbuilding construction operations at its Avondale, Louisiana facility, respectively. In connection with winding down shipbuilding at its Avondale facility, the Company incurred and paid related restructuring and shutdown costs. Pursuant to applicable provisions of the FAR and CAS for the treatment of restructuring and shutdown related costs, the Company began amortizing the deferred costs over a five year period in 2014. In November 2017, the U.S. Government and the Company reached a settlement to treat $251 million of these costs as allowable costs, a majority of which were billed to the U.S. Government and collected by the end of 2018. The settlement was consistent with management’s cost recovery expectations and did not have a material effect on the Company’s statements of financial position or results of operations. In October 2018, the Company completed a sale of the Avondale facility. In addition to cash proceeds, the Company financed a portion of the transaction over a nine year period, resulting in a net gain of $7 million , recognized as a reduction to cost of sales in the fourth quarter of 2018. In connection with the closure of its Gulfport facility, the Company incurred restructuring related costs of $54 million , including $52 million of accelerated depreciation of fixed assets. The Company reached a resolution with the U.S. Government in December 2018 regarding the treatment and allocation of the restructuring related costs, which was substantially in accordance with management's cost recovery expectations and did not have a material effect on the Company's consolidated financial position, results of operations, or cash flows.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2019
Acquisitions [Abstract]
Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block]	ACQUISITIONS On February 25, 2019, the Company acquired Fulcrum IT Services, LLC ("Fulcrum"), an information technology and government consulting company, for approximately $195 million in cash, net of $1 million of acquired cash. The acquisition is consistent with the Company's strategy to optimize and expand its services portfolio. In connection with this acquisition, the Company recorded $133 million of goodwill, which includes the value of Fulcrum's workforce, all of which was allocated to its Technical Solutions segment, as well as $49 million of intangible assets related to existing contract backlog. See Note 11: Goodwill and Other Intangible Assets. The Company has not completed the purchase price allocation due to the recent acquisition date and potential adjustments upon finalization of the net working capital adjustment and the fair values of the assets acquired and liabilities assumed. The assets, liabilities, and results of operations of Fulcrum are not material to the Company’s consolidated financial position, results of operations, or cash flows. On December 3, 2018, the Company acquired G2, Inc. ("G2"), a provider of cybersecurity solutions to the U.S. Government, for approximately $77 million in cash, net of $2 million of acquired cash. The acquisition is consistent with the Company's strategy to optimize and expand its services portfolio. In connection with this acquisition, the Company recorded $46 million of goodwill, which includes the value of G2's workforce, all of which was allocated to its Technical Solutions segment, as well as $20 million of intangible assets related to existing contract backlog. For the three months ended March 31, 2019 , the Company recorded an increase in goodwill of $6 million , primarily driven by the finalization of fair value calculations for certain assets and liabilities. See Note 11: Goodwill and Other Intangible Assets. The Company has not completed the purchase price allocation due to the recent acquisition date and potential adjustments upon finalization of the net working capital adjustment and the fair values of the assets acquired and liabilities assumed. The assets, liabilities, and results of operations of G2 are not material to the Company’s consolidated financial position, results of operations, or cash flows. The Company funded each of these acquisitions using cash on hand and borrowings on its revolving credit facility. The acquisition costs incurred in connection with these acquisitions were not material. The operating results of these businesses have been included in the Company’s consolidated results as of the respective closing dates of the acquisitions. In allocating the purchase prices of these businesses, the Company considered the estimated fair value of net tangible and intangible assets acquired, with any excess purchase price recorded as goodwill. The total amount of goodwill resulting from these acquisitions is expected to be amortizable for tax purposes. These acquisitions are not material either individually or in the aggregate, and pro forma revenues and results of operations have therefore not been provided.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2019
Stockholders' Equity Note [Abstract]
Stockholders' Equity [Text Block]	STOCKHOLDERS' EQUITY Treasury Stock - In November 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 from October 31, 2019, to October 31, 2022. Repurchases are made from time to time at management's discretion in accordance with applicable federal securities laws. For the three months ended March 31, 2019 , the Company repurchased 183,885 shares at an aggregate cost of $36 million . For the three months ended March 31, 2019 , the Company also settled for cash $48 million of shares repurchased in the prior year. For the three months ended March 31, 2018 , the Company repurchased 674,365 shares at an aggregate cost of $166 million , of which approximately $3 million was not yet settled for cash as of March 31, 2018 . For the three months ended March 31, 2018 , the Company also settled for cash $2 million of shares repurchased in the prior year. The cost of purchased shares is recorded as treasury stock in the unaudited condensed consolidated statements of financial position. Dividends - The Company declared cash dividends per share of $0.86 and $0.72 for the three months ended March 31, 2019 and 2018 , respectively. The Company paid cash dividends totaling $36 million and $32 million for the three months ended March 31, 2019 and 2018 , respectively. Accumulated Other Comprehensive Loss - Other comprehensive income (loss) refers to gains and losses recorded as an element of stockholders' equity but excluded from net earnings. The accumulated other comprehensive loss as of March 31, 2019 , was comprised of unamortized benefit plan costs of $1,264 million and other comprehensive loss items of $5 million . The accumulated other comprehensive loss as of December 31, 2018 , was comprised of unamortized benefit plan costs of $1,283 million and other comprehensive income items of $5 million . The changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2019 and 2018 , were as follows: ($ in millions) Benefit Plans Other Total Balance as of December 31, 2017 $ (906 ) $ 6 $ (900 ) Amounts reclassified from accumulated other comprehensive loss Amortization of prior service cost 1 1 — 1 Amortization of net actuarial loss 1 19 — 19 Tax expense for items of other comprehensive income (5 ) — (5 ) Net current period other comprehensive income 15 — 15 Effect of Accounting Standards Update 2016-01 2 — (11 ) (11 ) Effect of Accounting Standards Update 2018-02 3 (204 ) 2 (202 ) Balance as of March 31, 2018 (1,095 ) (3 ) (1,098 ) Balance as of December 31, 2018 (1,283 ) (5 ) (1,288 ) Amounts reclassified from accumulated other comprehensive loss Amortization of net actuarial loss 1 25 — 25 Tax expense for items of other comprehensive income (6 ) — (6 ) Net current period other comprehensive income 19 — 19 Balance as of March 31, 2019 $ (1,264 ) $ (5 ) $ (1,269 ) 1 These accumulated comprehensive 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 loss for the three months ended March 31, 2019 and 2018 , was $6 million and $5 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	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE Basic and diluted earnings per common share were calculated as follows: Three Months Ended (in millions, except per share amounts) 2019 2018 Net earnings $ 118 $ 156 Weighted-average common shares outstanding 41.4 44.8 Net dilutive effect of stock options and awards — — Dilutive weighted-average common shares outstanding 41.4 44.8 Earnings per share - basic $ 2.85 $ 3.48 Earnings per share - diluted $ 2.85 $ 3.48 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 months ended March 31, 2019 and 2018.

Revenue

Revenue	3 Months Ended
	Mar. 31, 2019
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 generates revenue primarily under U.S. Government contracts from the provision of fleet support and MDIS 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 March 31, 2019 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 538 $ 939 $ 13 $ — $ 1,490 Service revenues 46 326 218 — 590 Intersegment — — 26 (26 ) — Sales and service revenues $ 584 $ 1,265 $ 257 $ (26 ) $ 2,080 Customer Type Federal $ 584 $ 1,265 $ 165 $ — $ 2,014 Commercial — — 66 — 66 Intersegment — — 26 (26 ) — Sales and service revenues $ 584 $ 1,265 $ 257 $ (26 ) $ 2,080 Contract Type Firm fixed-price $ 17 $ 2 $ 36 $ — $ 55 Fixed-price incentive 478 453 — — 931 Cost-type 89 810 112 — 1,011 Time and materials — — 83 — 83 Intersegment — — 26 (26 ) — Sales and service revenues $ 584 $ 1,265 $ 257 $ (26 ) $ 2,080 Three Months Ended March 31, 2018 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 534 $ 822 $ 14 $ — $ 1,370 Service revenues 51 260 193 — 504 Intersegment — — 26 (26 ) — Sales and service revenues $ 585 $ 1,082 $ 233 $ (26 ) $ 1,874 Customer Type Federal $ 585 $ 1,082 $ 151 $ — $ 1,818 Commercial — — 56 — 56 Intersegment — — 26 (26 ) — Sales and service revenues $ 585 $ 1,082 $ 233 $ (26 ) $ 1,874 Contract Type Firm fixed-price $ 24 $ 3 $ 40 $ — $ 67 Fixed-price incentive 486 417 1 — 904 Cost-type 75 662 93 — 830 Time and materials — — 73 — 73 Intersegment — — 26 (26 ) — Sales and service revenues $ 585 $ 1,082 $ 233 $ (26 ) $ 1,874 Three Months Ended March 31 Three Months Ended March 31 ($ in millions) 2019 2018 Major Programs Amphibious assault ships $ 297 $ 288 Surface combatants and coast guard cutters 286 296 Other 1 1 Total Ingalls 584 585 Aircraft carriers 713 587 Submarines 368 359 Other 184 136 Total Newport News 1,265 1,082 Government and energy services 208 194 Oil and gas services 49 39 Total Technical Solutions 257 233 Intersegment eliminations (26 ) (26 ) Sales and service revenues $ 2,080 $ 1,874 As of March 31, 2019 , the Company had $40.6 billion of remaining performance obligations. The Company expects to recognize approximately 30% of its remaining performance obligations as revenue through 2020, an additional 25% through 2022, and the balance thereafter. Cumulative Catch-up Adjustments For the three months ended March 31, 2019 , net cumulative catch-up adjustments decreased operating income and diluted earnings per share by $6 million and $0.11 , respectively. For the three months ended March 31, 2018 , net cumulative catch-up adjustments increased operating income and diluted earnings per share by $28 million and $0.50 , respectively. No individual adjustment was material to the Company's unaudited condensed consolidated statements of operations and comprehensive income for the three months ended March 31, 2019 and 2018 . 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 $218 million from December 31, 2018, to March 31, 2019 , primarily due to an increase in contract assets as a result of revenue on certain U.S. Navy contracts. For the three months ended March 31, 2019 , the Company recognized revenue of $217 million related to its contract liabilities as of December 31, 2018 .

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION The Company is organized into three reportable segments: Ingalls, Newport News, and Technical Solutions, consistent with how management makes operating decisions and assesses performance. The following table presents segment results for the three months ended March 31, 2019 and 2018 : Three Months Ended ($ in millions) 2019 2018 Sales and Service Revenues Ingalls $ 584 $ 585 Newport News 1,265 1,082 Technical Solutions 257 233 Intersegment eliminations (26 ) (26 ) Sales and service revenues $ 2,080 $ 1,874 Operating Income Ingalls $ 46 $ 64 Newport News 78 51 Technical Solutions 5 2 Segment operating income 129 117 Non-segment factors affecting operating income (loss) Operating FAS/CAS Adjustment 34 72 Non-current state income taxes (2 ) 2 Operating income $ 161 $ 191 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 CAS. The following table presents the Company's assets by segment. ($ in millions) March 31 December 31 Assets Ingalls $ 1,595 $ 1,448 Newport News 3,907 3,572 Technical Solutions 1,084 734 Corporate 414 629 Total assets $ 7,000 $ 6,383

Inventoried Costs, Net

Inventoried Costs, Net	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventoried Costs, Net	INVENTORIED COSTS, NET Inventoried costs were comprised of the following: ($ in millions) March 31 December 31 Production costs of contracts in process 1 $ 29 $ 34 Raw material inventory 98 94 Total inventoried costs, net $ 127 $ 128 1 Includes amounts capitalized pursuant to applicable provisions of the FAR and CAS.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill HII performs impairment tests for goodwill as of November 30 of each year and between annual impairment tests if an event occurs or circumstances change that would more likely than not reduce the fair values of the Company's reporting units below their carrying values. Accumulated goodwill impairment losses as of each of March 31, 2019 , and December 31, 2018 , were $2,877 million . The accumulated goodwill impairment losses for Ingalls as of each of March 31, 2019 , and December 31, 2018 , were $1,568 million . The accumulated goodwill impairment losses for Newport News as of each of March 31, 2019 , and December 31, 2018 , were $1,187 million . The accumulated goodwill impairment losses for Technical Solutions as of each of March 31, 2019 , and December 31, 2018 , were $122 million . For the three months ended March 31, 2019, the carrying amounts of goodwill changed as follows: ($ in millions) Ingalls Newport News Technical Solutions Total Balance as of December 31, 2018 175 721 367 1,263 Acquisitions — — 133 133 Adjustments — — 6 6 Balance as of March 31, 2019 $ 175 $ 721 $ 506 $ 1,402 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 $11 million and $9 million for the three months ended March 31, 2019 and 2018 , respectively. In connection with the Fulcrum purchase in 2019, the Company recorded $49 million of intangible assets pertaining to existing contract backlog and customer relationships, to be amortized using the pattern of benefits method over a weighted-average life of seven years . In connection with the G2 purchase in 2018, the Company recorded $20 million of intangible assets pertaining to existing contract backlog and customer relationships, to be amortized using the pattern of benefits method over a weighted-average life of seven years . The Company expects amortization expense for purchased intangible assets of approximately $47 million in 2019, $44 million in 2020, $40 million in 2021, $37 million in 2022, and $27 million in 2023.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 and 2018 , were 20.8% and 20.0% , respectively. The higher effective tax rate for the three months ended March 31, 2019 , was primarily attributable to a reduction in the income tax benefits resulting from stock award settlement activity. For the three months ended March 31, 2019 and 2018, the Company's effective tax rate differed from the federal statutory rate primarily as a result of the income tax benefits resulting from stock award settlement activity. The Company's unrecognized tax benefits did not increase during the three months ended March 31, 2019 . As of March 31, 2019 , the estimated amounts of the Company's uncertain tax positions, excluding interest and penalties, were liabilities of $25 million . Assuming a sustainment of these positions, the reversal of the $25 million accrual would favorably affect the Company's effective federal income tax rate in future periods. The Company recognizes interest and penalties related to unrecognized tax benefits as income tax expense. For the three months ended March 31, 2019 , interest associated with the unrecognized tax benefits noted above did not materially increase income tax expense. 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	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Debt	DEBT Long-term debt consisted of the following: ($ in millions) March 31 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 Revolving credit facility borrowings 212 — Less unamortized debt issuance costs (21 ) (22 ) Total long-term debt $ 1,496 $ 1,283 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 variable interest rate on outstanding borrowings as of March 31, 2019 was LIBOR plus 1.250% . 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 March 31, 2019 , 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 March 31, 2019 , the Company had $212 million of outstanding borrowings and $22 million in issued but undrawn letters of credit under the revolving credit facility. The remaining $1,016 million of the revolving credit facility was unutilized. The Company had unamortized debt issuance costs associated with its credit facilities of $8 million as of March 31, 2019 , and December 31, 2018 . 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 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 $13 million and $14 million as of March 31, 2019 , and December 31, 2018 , respectively. Mississippi Economic Development Revenue Bonds - As of each of March 31, 2019 , and December 31, 2018 , 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 March 31, 2019 , and December 31, 2018 , 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 three months ended March 31, 2019 . The estimated fair values of the Company's total long-term debt as of March 31, 2019 , and December 31, 2018 , were $1,533 million and $1,292 million , respectively. The fair values of the Company's long-term debt were calculated based on recent trades of the Company's debt instruments in inactive markets, which fall within Level 2 under the fair value hierarchy. As of March 31, 2019 , the aggregate amounts of principal payments due on long-term debt within the next five years included $212 million due in 2022.

Investigations, Claims, and Lit

Investigations, Claims, and Litigation	3 Months Ended
	Mar. 31, 2019
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. Asbestos Related Claims - HII and its predecessors-in-interest are defendants in a longstanding series of cases that have been and continue to be filed in various jurisdictions around the country, wherein former and current employees and various third parties allege exposure to asbestos containing materials while on or associated with HII premises or while working on vessels constructed or repaired by HII. The cases allege various injuries, including those associated with pleural plaque disease, asbestosis, cancer, mesothelioma, and other alleged asbestos related conditions. In some cases, several of HII's former executive officers are also named as defendants. In some instances, partial or full insurance coverage is available to the Company for its liability and that of its former executive officers. The costs to resolve cases during the three months ended March 31, 2019 and 2018 , were immaterial individually and in the aggregate. The Company’s estimate of asbestos-related liabilities is subject to uncertainty because liabilities are influenced by numerous variables that are inherently difficult to predict. Key variables include the number and type of new claims, the litigation process from jurisdiction to jurisdiction and from case to case, reforms made by state and federal courts, and the passage of state or federal tort reform legislation. Although the Company believes the ultimate resolution of current cases will not have a material effect on its consolidated financial position, results of operations, or cash flows, it cannot predict what new or revised claims or litigation might be asserted or what information might come to light and can, therefore, give no assurances regarding the ultimate outcome of asbestos related litigation. Other Litigation - On March 29, 2019, a new dry dock being transported for delivery to Ingalls by a heavy lift ship struck an Ingalls work barge, which in turn was pushed into Delbert D. Black (DDG 119) causing damage to Delbert D. Black (DDG 119), the work barge, and the new dry dock. At the time of the incident, responsibility for the new dry dock remained with the builder and the transport company. The Company and the U.S. Navy are in the process of estimating the damage to Delbert D. Black (DDG 119), and repair work has begun at Navy direction. The Company is working with the U.S. Navy to ascertain whether one or more third parties will pay for the repairs to Delbert D. Black (DDG 119) or whether the repairs will be paid for pursuant to the builder's risk insurance as contained in the Delbert D. Black (DDG 119) contract. The Company is also estimating other direct and consequential damages, which include damages to the facility as well as schedule and delay impacts resulting from the incident. On April 11, 2019, the Company filed suit in the U.S. District Court for the Southern District of Mississippi seeking, among other relief, to arrest the heavy lift ship. On April 16, 2019, $75 million in security was posted, eliminating the need to arrest the heavy lift ship. The court can reduce the amount of that security in the event it determines that the heavy lift ship’s value is less than $75 million . Based on information currently available, management believes it will collect sufficient funds from one or more third parties to compensate for the resulting direct and consequential damages, but failure to collect sufficient funds or the length of time required to collect such funds could result in a material effect on the Company’s financial position, results of operations, or cash flows. The Company and its predecessor-in-interest have been in litigation with the Bolivarian Republic of Venezuela (the "Republic") since 2002 over a contract for the repair, refurbishment, and modernization at Ingalls of two foreign-built frigates. 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 is seeking to enforce and execute upon the award in multiple jurisdictions. No assurances can be provided regarding the ultimate resolution of this matter. The Company is party to various other claims, legal proceedings and investigations that arise in the ordinary course of business, including U.S. Government investigations that could result in administrative, civil, or criminal proceedings involving the Company. The Company is a contractor with the U.S. Government, and such proceedings can therefore include False Claims Act allegations against the Company. Although the Company believes that the resolution of these other claims, legal proceedings and investigations will not have a material effect on its consolidated financial position, results of operations, or cash flows, the Company cannot predict what new or revised claims or litigation might be asserted or what information might come to light and can, therefore, give no assurances regarding the ultimate outcome of these matters.

Leases

Leases	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	LEASES The Company leases certain land, warehouses, office space, and production, office, and technology equipment, among other items. Most equipment is leased on a monthly basis. Many land, warehouse, and office space leases include renewal terms that can extend the lease term. The exercise of lease renewal options is at our sole discretion. The depreciable life of assets and leasehold improvements are generally limited by the expected lease term. Our lease agreements do not generally contain material residual value guarantees, material restrictive covenants, or purchase options. Our lease portfolio consists primarily of operating leases. Amounts prior to January 1, 2019 are reported under Topic 840 and amounts after January 1, 2019 are reported under Topic 842 in accordance with ASU 2016-02. Lease costs and other information were as follows: Three Months Ended ($ in millions) 2019 Operating lease costs $ 11 Short-term operating lease costs $ 5 Variable operating lease costs $ 1 Operating cash flows from operating leases $ (11 ) Right-of-use assets obtained in exchange for new operating lease liabilities $ 13 Weighted-average remaining lease term (years) - operating leases 11 Weighted-average discount rate - operating leases 4.5 % The undiscounted future non-cancellable lease payments under our operating leases are as follows: Year: March 31 December 31 2019 $ 46 $ 41 2020 40 36 2021 34 30 2022 27 20 2023 20 13 Thereafter 119 56 Total Lease payments 286 196 Less: imputed interest 66 — Present value of lease liabilities $ 220 $ —

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 , recognized amounts related to claims and requests for equitable adjustment were not material individually or in 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 attempts to limit its exposure under these arrangements to its investment or the extent of obligations under the applicable contract. In some cases, however, HII may be required to guarantee performance of the arrangement's obligations and, in such cases, generally obtains cross-indemnification from the other members of the arrangement. In the ordinary course of business, the Company may guarantee obligations of its subsidiaries under certain contracts. Generally, the Company is liable under such 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 March 31, 2019 , the Company was not aware of any existing event of default that would require it to satisfy any of these guarantees. Environmental Matters -The estimated cost to complete environmental remediation has been accrued when it is probable that the Company will incur such costs in the future to address environmental conditions at currently or formerly owned or leased operating facilities, or at sites where it has been named a Potentially Responsible Party ("PRP") by the Environmental Protection Agency or similarly designated by another environmental agency, and the related costs can be estimated by management. These accruals do not include any litigation costs related to environmental matters, nor do they include amounts recorded as asset retirement obligations. To assess the potential impact on the Company's consolidated financial statements, management estimates the range of reasonably possible remediation costs that could be incurred by the Company, taking into account currently available facts on each site, as well as the current state of technology and prior experience remediating contaminated sites. These estimates are reviewed periodically and adjusted to reflect changes in facts and technical and legal circumstances. Management estimated that as of March 31, 2019 , the probable estimable future cost for environmental remediation was immaterial. Factors that could result in changes to the Company's estimates include: modification of planned remedial actions, increases or decreases in the estimated time required to remediate, changes to the determination of legally responsible parties, discovery of more extensive contamination than anticipated, changes in laws and regulations affecting remediation requirements, and improvements in remediation technology. Should other PRPs not pay their allocable share of remediation costs, the Company may incur costs exceeding those already estimated and accrued. In addition, there are certain potential remediation sites where the costs of remediation cannot be reasonably estimated. Although management cannot predict whether new information gained as remediation progresses will materially affect the estimated liability accrued, management does not believe that future remediation expenditures will have a material effect on the Company's consolidated financial position, results of operations, or cash flows. Financial Arrangements - In the ordinary course of business, HII uses standby letters of credit issued by commercial banks and surety bonds issued by insurance companies primarily to support the Company's self-insured workers' compensation plans. As of March 31, 2019 , the Company had $22 million in standby letters of credit issued but undrawn, as indicated in Note 13: Debt, and $275 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. On March 8, 2019, the Company's Newport News segment received corrective action requests from the Newport News contracting officer resulting from an audit of its material management accounting system ("MMAS") by the Defense Contract Audit Agency ("DCAA"). The Company provided a corrective action plan to the contracting officer on April 22, 2019, and will continue working with the U.S. Government to ensure all outstanding corrective actions are addressed. Collective Bargaining Agreements - Of the Company's approximately 40,000 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, which expire in December 2019, November 2020, November 2021, and December 2022. The collective bargaining agreement that expires in November 2021 covers approximately 50% of Newport News employees. Newport News craft workers employed at the Kesselring Site near Saratoga Springs, New York are represented under an indefinite Department of Energy ("DoE") site agreement. Ingalls has five collective bargaining agreements covering represented employees, all of which expire in March 2022. Approximately 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	3 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
Employee Pension and Other Postretirement Benefits	EMPLOYEE PENSION AND OTHER POSTRETIREMENT BENEFITS The Company provides eligible employees defined benefit pension plans, postretirement benefit plans, and defined contribution pension plans. The costs of the Company's defined benefit pension plans and other postretirement benefit plans for the three months ended March 31, 2019 and 2018 , were as follows: Three Months Ended Pension Benefits Other Benefits ($ in millions) 2019 2018 2019 2018 Components of Net Periodic Benefit Cost Service cost $ 36 $ 39 $ 2 $ 2 Interest cost 69 64 5 5 Expected return on plan assets (102 ) (107 ) — — Amortization of prior service cost (credit) 5 6 (5 ) (5 ) Amortization of net actuarial loss (gain) 28 20 (3 ) (1 ) Net periodic benefit cost $ 36 $ 22 $ (1 ) $ 1 The Company made the following contributions to its defined benefit pension and other postretirement plans for the three months ended March 31, 2019 and 2018 : Three Months Ended ($ in millions) 2019 2018 Pension plans Qualified minimum $ — $ — Discretionary Qualified 1 34 Non-qualified 2 2 Other benefit plans 7 7 Total contributions $ 10 $ 43 For the year ending December 31, 2019 , the Company expects cash contributions to its qualified defined benefit plans to be $21 million , all of which will be discretionary.

Stock Compensation Plans

Stock Compensation Plans	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Compensation Plans	STOCK COMPENSATION PLANS During the three months ended March 31, 2019 and 2018 , the Company issued new stock awards as follows: Restricted Performance Stock Rights - For the three months ended March 31, 2019 , the Company granted approximately 0.1 million RPSRs at a weighted average share price of $210.24 . These rights are subject to cliff vesting on December 31, 2021. For the three months ended March 31, 2018 , the Company granted approximately 0.1 million RPSRs at a weighted average share price of $262.76 . These rights are subject to cliff vesting on December 31, 2020. 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 three months ended March 31, 2019 and 2018 , 0.3 million and 0.2 million stock awards vested, respectively, of which approximately 0.1 million for each year were transferred to the Company from employees in satisfaction of minimum tax withholding obligations. The following table summarizes the status of the Company's outstanding stock awards as of March 31, 2019 . Stock Awards (in thousands) Weighted-Average Grant Date Fair Value Weighted-Average Remaining Contractual Term (in years) Total stock awards 369 $ 201.82 1.5 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 March 31, 2019 and 2018 , of $5 million and $7 million , respectively. The Company recorded tax benefits related to stock awards of $1 million for the three months ended March 31, 2019 and 2018 . The Company recognized tax benefits associated with the issuance of stock in settlement of stock awards for the three months ended March 31, 2019 and 2018 , of $5 million and $7 million , respectively. Unrecognized Compensation Expense As of March 31, 2019 , the Company had less than $1 million of unrecognized compensation expense associated with Restricted Stock Rights granted in 2018 and 2017, which will be recognized over a weighted average period of 1.1 years , and $46 million of unrecognized compensation expense associated with RPSRs granted in 2019, 2018, and 2017, which will be recognized over a weighted average period of 1.8 years .

Subsidiary Guarantors

Subsidiary Guarantors	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 , and December 31, 2018 , including any repurchase obligations resulting from a change of control, is fully and unconditionally guaranteed, jointly and severally, on an unsecured basis, by each of HII's existing and future material domestic subsidiaries ("Subsidiary Guarantors"). The Subsidiary Guarantors are 100% owned by HII. Under SEC Regulation S-X Rule 3-10, each HII subsidiary that did not provide a guarantee ("Non-Guarantors") is minor and HII, as the parent company issuer, did not have independent assets or operations. There are no significant restrictions on the ability of the parent company and the Subsidiary Guarantors to obtain funds from their respective subsidiaries by dividend or loan, except those imposed by applicable law.

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2019
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. 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, 2018 .
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 - 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. When 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. When 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, 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. In addition, for time and material arrangements, 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. 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 in which 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 three months ended March 31, 2019 , the Company recognized cash grant benefits of approximately $36 million in other long-term liabilities in the unaudited condensed consolidated statements of financial position. For the three months ended March 31, 2018 , the Company recognized cash grant benefits of approximately $2 million in other long-term liabilities in the unaudited condensed consolidated statements of financial position.
Fair Value of Financial Instruments	Fair Value of Financial Instruments - Except for the Company's long-term debt, the carrying amounts of the Company's financial instruments recorded at historical cost approximate fair value due to the short-term nature of the instruments and low credit risk associated with the respective counterparties. The Company maintains multiple grantor trusts to fund certain non-qualified pension plans. These trusts were valued at $121 million and $109 million as of March 31, 2019 , and December 31, 2018 , respectively, and are presented within miscellaneous other assets within the unaudited condensed consolidated statements of financial position. These trusts consist primarily of investments in marketable securities, which are held at fair value within Level 1 of the fair value hierarchy.
Leases	Leases - The Company determines if an arrangement is a lease at contract inception. A lease exists when a contract conveys to a party the right to control the use of identified property, plant, or equipment for a period of time in exchange for consideration. The Company recognizes a lease liability at the lease commencement date, as the present value of future lease payments, using an estimated rate of interest that the Company would pay to borrow equivalent funds on a collateralized basis. A lease asset is recognized based on the lease liability value and adjusted for any prepaid lease payments, initial direct costs, or lease incentive amounts. The lease term at the commencement date includes any renewal options or termination options when it is reasonably certain that the Company will exercise or not exercise those options, respectively. Right of use assets associated with operating leases are recognized in operating lease assets in the unaudited condensed consolidated statements of financial position. Lease liabilities associated with operating leases are recognized in long-term operating lease liabilities, with short-term lease liability amounts included in other current liabilities in the unaudited condensed consolidated statements of financial position . Rent expense for operating leases is recognized on a straight-line basis over the lease term and included in cost of sales and service revenues on the unaudited condensed consolidated statements of operations and comprehensive income. Variable lease payments are recognized as incurred and include lease operating expenses, which are based on contractual lease terms. The Company elected to exclude from its unaudited condensed consolidated statements of financial position leases having terms of 12 months or less (short-term leases) and elected not to separate lease and non-lease components in the determination of lease payment obligations for its long-term lease contracts.
Loan Receivable	Loan Receivable - The Company holds a loan receivable in connection with a seller financed transaction involving its previously owned Avondale shipyard facility. The receivable is carried at amortized cost in the amount of $38 million , net of a $10 million loan discount, which approximates fair value and is recorded in miscellaneous other assets on the unaudited condensed consolidated statements of financial position. Interest income is recognized on an accrual basis using the effective yield method. The discount is accreted into income using the effective yield method over the estimated life of the loan receivable.
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. For the year ended December 31, 2018, the Company received the $8 million from Northrop Grumman. As of each of March 31, 2019 , and December 31, 2018 , 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.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2019
Stockholders' Equity Note [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2019 and 2018 , were as follows: ($ in millions) Benefit Plans Other Total Balance as of December 31, 2017 $ (906 ) $ 6 $ (900 ) Amounts reclassified from accumulated other comprehensive loss Amortization of prior service cost 1 1 — 1 Amortization of net actuarial loss 1 19 — 19 Tax expense for items of other comprehensive income (5 ) — (5 ) Net current period other comprehensive income 15 — 15 Effect of Accounting Standards Update 2016-01 2 — (11 ) (11 ) Effect of Accounting Standards Update 2018-02 3 (204 ) 2 (202 ) Balance as of March 31, 2018 (1,095 ) (3 ) (1,098 ) Balance as of December 31, 2018 (1,283 ) (5 ) (1,288 ) Amounts reclassified from accumulated other comprehensive loss Amortization of net actuarial loss 1 25 — 25 Tax expense for items of other comprehensive income (6 ) — (6 ) Net current period other comprehensive income 19 — 19 Balance as of March 31, 2019 $ (1,264 ) $ (5 ) $ (1,269 ) 1 These accumulated comprehensive 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 loss for the three months ended March 31, 2019 and 2018 , was $6 million and $5 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)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Calculation of Basic and Diluted Earnings Per Share	Basic and diluted earnings per common share were calculated as follows: Three Months Ended (in millions, except per share amounts) 2019 2018 Net earnings $ 118 $ 156 Weighted-average common shares outstanding 41.4 44.8 Net dilutive effect of stock options and awards — — Dilutive weighted-average common shares outstanding 41.4 44.8 Earnings per share - basic $ 2.85 $ 3.48 Earnings per share - diluted $ 2.85 $ 3.48

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 538 $ 939 $ 13 $ — $ 1,490 Service revenues 46 326 218 — 590 Intersegment — — 26 (26 ) — Sales and service revenues $ 584 $ 1,265 $ 257 $ (26 ) $ 2,080 Customer Type Federal $ 584 $ 1,265 $ 165 $ — $ 2,014 Commercial — — 66 — 66 Intersegment — — 26 (26 ) — Sales and service revenues $ 584 $ 1,265 $ 257 $ (26 ) $ 2,080 Contract Type Firm fixed-price $ 17 $ 2 $ 36 $ — $ 55 Fixed-price incentive 478 453 — — 931 Cost-type 89 810 112 — 1,011 Time and materials — — 83 — 83 Intersegment — — 26 (26 ) — Sales and service revenues $ 584 $ 1,265 $ 257 $ (26 ) $ 2,080 Three Months Ended March 31, 2018 ($ in millions) Ingalls Newport News Technical Solutions Intersegment Eliminations Total Revenue Type Product sales $ 534 $ 822 $ 14 $ — $ 1,370 Service revenues 51 260 193 — 504 Intersegment — — 26 (26 ) — Sales and service revenues $ 585 $ 1,082 $ 233 $ (26 ) $ 1,874 Customer Type Federal $ 585 $ 1,082 $ 151 $ — $ 1,818 Commercial — — 56 — 56 Intersegment — — 26 (26 ) — Sales and service revenues $ 585 $ 1,082 $ 233 $ (26 ) $ 1,874 Contract Type Firm fixed-price $ 24 $ 3 $ 40 $ — $ 67 Fixed-price incentive 486 417 1 — 904 Cost-type 75 662 93 — 830 Time and materials — — 73 — 73 Intersegment — — 26 (26 ) — Sales and service revenues $ 585 $ 1,082 $ 233 $ (26 ) $ 1,874 Three Months Ended March 31 Three Months Ended March 31 ($ in millions) 2019 2018 Major Programs Amphibious assault ships $ 297 $ 288 Surface combatants and coast guard cutters 286 296 Other 1 1 Total Ingalls 584 585 Aircraft carriers 713 587 Submarines 368 359 Other 184 136 Total Newport News 1,265 1,082 Government and energy services 208 194 Oil and gas services 49 39 Total Technical Solutions 257 233 Intersegment eliminations (26 ) (26 ) Sales and service revenues $ 2,080 $ 1,874

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment operating results	The following table presents segment results for the three months ended March 31, 2019 and 2018 : Three Months Ended ($ in millions) 2019 2018 Sales and Service Revenues Ingalls $ 584 $ 585 Newport News 1,265 1,082 Technical Solutions 257 233 Intersegment eliminations (26 ) (26 ) Sales and service revenues $ 2,080 $ 1,874 Operating Income Ingalls $ 46 $ 64 Newport News 78 51 Technical Solutions 5 2 Segment operating income 129 117 Non-segment factors affecting operating income (loss) Operating FAS/CAS Adjustment 34 72 Non-current state income taxes (2 ) 2 Operating income $ 161 $ 191
Segment assets	The following table presents the Company's assets by segment. ($ in millions) March 31 December 31 Assets Ingalls $ 1,595 $ 1,448 Newport News 3,907 3,572 Technical Solutions 1,084 734 Corporate 414 629 Total assets $ 7,000 $ 6,383

Inventoried Costs, Net (Tables)

Inventoried Costs, Net (Tables)	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventoried costs, net	Inventoried costs were comprised of the following: ($ in millions) March 31 December 31 Production costs of contracts in process 1 $ 29 $ 34 Raw material inventory 98 94 Total inventoried costs, net $ 127 $ 128 1 Includes amounts capitalized pursuant to applicable provisions of the FAR and CAS.

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	For the three months ended March 31, 2019, the carrying amounts of goodwill changed as follows: ($ in millions) Ingalls Newport News Technical Solutions Total Balance as of December 31, 2018 175 721 367 1,263 Acquisitions — — 133 133 Adjustments — — 6 6 Balance as of March 31, 2019 $ 175 $ 721 $ 506 $ 1,402

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consisted of the following: ($ in millions) March 31 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 Revolving credit facility borrowings 212 — Less unamortized debt issuance costs (21 ) (22 ) Total long-term debt $ 1,496 $ 1,283

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Components of Lease Expense	Lease costs and other information were as follows: Three Months Ended ($ in millions) 2019 Operating lease costs $ 11 Short-term operating lease costs $ 5 Variable operating lease costs $ 1 Operating cash flows from operating leases $ (11 ) Right-of-use assets obtained in exchange for new operating lease liabilities $ 13 Weighted-average remaining lease term (years) - operating leases 11 Weighted-average discount rate - operating leases 4.5 %
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	The undiscounted future non-cancellable lease payments under our operating leases are as follows: Year: March 31 December 31 2019 $ 46 $ 41 2020 40 36 2021 34 30 2022 27 20 2023 20 13 Thereafter 119 56 Total Lease payments 286 196 Less: imputed interest 66 — Present value of lease liabilities $ 220 $ —

Employee Pension and Other Po_2

Employee Pension and Other Postretirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs	The costs of the Company's defined benefit pension plans and other postretirement benefit plans for the three months ended March 31, 2019 and 2018 , were as follows: Three Months Ended Pension Benefits Other Benefits ($ in millions) 2019 2018 2019 2018 Components of Net Periodic Benefit Cost Service cost $ 36 $ 39 $ 2 $ 2 Interest cost 69 64 5 5 Expected return on plan assets (102 ) (107 ) — — Amortization of prior service cost (credit) 5 6 (5 ) (5 ) Amortization of net actuarial loss (gain) 28 20 (3 ) (1 ) Net periodic benefit cost $ 36 $ 22 $ (1 ) $ 1
Schedule of Defined Benefit Plans Disclosures, Cash Contributions	The Company made the following contributions to its defined benefit pension and other postretirement plans for the three months ended March 31, 2019 and 2018 : Three Months Ended ($ in millions) 2019 2018 Pension plans Qualified minimum $ — $ — Discretionary Qualified 1 34 Non-qualified 2 2 Other benefit plans 7 7 Total contributions $ 10 $ 43

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 . Stock Awards (in thousands) Weighted-Average Grant Date Fair Value Weighted-Average Remaining Contractual Term (in years) Total stock awards 369 $ 201.82 1.5

Description of Business (Narrat

Description of Business (Narrative) (Details)	3 Months Ended
	Mar. 31, 2019segments
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	3

Basis of Presentation (Narrativ

Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred gain on receipt of property	$ 36	$ 2
Assets held in rabbi trusts	121		$ 109
Loans Receivable, Net	38
Receivable with Imputed Interest, Discount	10
Related Party Transaction [Line Items]
Long-term Debt	1,496		1,283
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]
Cash received related to spin-off agreements			$ 8

Account Standards Updates (Narr

Account Standards Updates (Narrative) (Details) $ in Millions	Mar. 31, 2019USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets	$ 220
Long-term operating lease liabilities	184
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets	215
Short-term operating lease liabilities	36
Long-term operating lease liabilities	$ 179

Avondale and Gulfport (Narrativ

Avondale and Gulfport (Narrative) (Details) - Facility closing $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Avondale Wind Down
Restructuring Cost and Reserve
Amortization of Restructuring Costs, Period	5 years
Restructuring and Related Costs, Allowable	$ 251
Financing receivable, contractual term	9 years
Gains (Losses) on Sales of Other Real Estate	$ 7
Gulfport [Member]
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	54
Restructuring and Related Cost, Accelerated Depreciation	$ 52

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 195
Goodwill arising from acquisitions	133
Goodwill, adjustments	6
Fulcrum IT Services, LLC
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	195
Cash acquired	1
Goodwill arising from acquisitions	133
Intangible Assets	49
G2, Inc.
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		$ 77
Cash acquired		2
Goodwill arising from acquisitions		46
Intangible Assets		$ 20
Goodwill, adjustments	$ 6

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Nov. 07, 2017	Oct. 31, 2015
Stockholders' Equity [Line Items]
Amount authorized for stock repurchase program					$ 2,200	$ 1,200
Repurchased shares of treasury stock	183,885	674,365
Treasury stock activity	$ 36	$ 166
Treasury Stock, Value Acquired, Not Yet Settled for Cash		3
Treasury Stock Value Previously Acquired, settled for cash	$ 48	$ 2
Dividends declared per share	$ 0.86	$ 0.72
Dividends paid	$ 36	$ 32
Accumulated other comprehensive income (loss)	(1,269)	(1,098)	$ (1,288)	$ (900)
Benefit Plans
Stockholders' Equity [Line Items]
Accumulated other comprehensive income (loss)	(1,264)	(1,095)	(1,283)	(906)
Other
Stockholders' Equity [Line Items]
Accumulated other comprehensive income (loss)	$ (5)	$ (3)	$ (5)	$ 6

Stockholders' Equity Accumulate

Stockholders' Equity Accumulated Other Comprehensive Income (Loss) (Table) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning		$ (1,288)	$ (900)
Amortization of prior service cost (credit)	[1]		1
Amortization of net actuarial loss (gain)	[1]	25	19
Tax benefit (expense) for items of other comprehensive income		(6)	(5)
Other comprehensive income (loss), net of tax		19	15
Effect of Accounting Standards Update 2016-01	[2]		(11)
Effect of Accounting Standards Update 2018-02	[3]		(202)
Balance, ending		(1,269)	(1,098)
Income tax expense (benefit)		31	39
Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning		(1,283)	(906)
Amortization of prior service cost (credit)	[1]		1
Amortization of net actuarial loss (gain)	[1]	25	19
Tax benefit (expense) for items of other comprehensive income		(6)	(5)
Other comprehensive income (loss), net of tax		19	15
Effect of Accounting Standards Update 2018-02	[3]		(204)
Balance, ending		(1,264)	(1,095)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning		(5)	6
Effect of Accounting Standards Update 2016-01	[2]		(11)
Effect of Accounting Standards Update 2018-02	[3]		2
Balance, ending		(5)	(3)
Reclassification out of AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)		$ 6	5
Accounting Standards Update 2016-01 [Member] | Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)			$ 4
[1]	These accumulated comprehensive 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 loss for the three months ended March 31, 2019 and 2018, was $6 million and $5 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
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share, Basic and Diluted [Abstract]
Net earnings (loss)	$ 118	$ 156
Weighted-average common shares outstanding (in shares)	41.4	44.8
Dilutive weighted-average common shares outstanding (in shares)	41.4	44.8
Earnings (loss) per share - basic (in dollars per share)	$ 2.85	$ 3.48
Earnings (loss) per share - diluted (in dollars per share)	$ 2.85	$ 3.48

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
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

Revenue (Table) (Details)

Revenue (Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Sales and service revenues	$ 2,080	$ 1,874
Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	55	67
Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	931	904
Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,011	830
Time-and-materials
Disaggregation of Revenue [Line Items]
Sales and service revenues	83	73
Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	2,014	1,818
Commercial
Disaggregation of Revenue [Line Items]
Sales and service revenues	66	56
Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,490	1,370
Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	590	504
Ingalls
Disaggregation of Revenue [Line Items]
Sales and service revenues	584	585
Ingalls | Amphibious assault ships
Disaggregation of Revenue [Line Items]
Sales and service revenues	297	288
Ingalls | Surface combatants and coast guard cutters
Disaggregation of Revenue [Line Items]
Sales and service revenues	286	296
Ingalls | Other programs
Disaggregation of Revenue [Line Items]
Sales and service revenues	1	1
Ingalls | Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	17	24
Ingalls | Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	478	486
Ingalls | Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	89	75
Ingalls | Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	584	585
Ingalls | Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	538	534
Ingalls | Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	46	51
Newport News
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,265	1,082
Newport News | Aircraft carriers
Disaggregation of Revenue [Line Items]
Sales and service revenues	713	587
Newport News | Submarines
Disaggregation of Revenue [Line Items]
Sales and service revenues	368	359
Newport News | Other programs
Disaggregation of Revenue [Line Items]
Sales and service revenues	184	136
Newport News | Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	2	3
Newport News | Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	453	417
Newport News | Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	810	662
Newport News | Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,265	1,082
Newport News | Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	939	822
Newport News | Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	326	260
Technical Solutions
Disaggregation of Revenue [Line Items]
Sales and service revenues	257	233
Intersegment	26	26
Technical Solutions | Government and energy services
Disaggregation of Revenue [Line Items]
Sales and service revenues	208	194
Technical Solutions | Oil and gas services
Disaggregation of Revenue [Line Items]
Sales and service revenues	49	39
Technical Solutions | Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	36	40
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	112	93
Technical Solutions | Time-and-materials
Disaggregation of Revenue [Line Items]
Sales and service revenues	83	73
Technical Solutions | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	26	26
Technical Solutions | Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	165	151
Technical Solutions | Commercial
Disaggregation of Revenue [Line Items]
Sales and service revenues	66	56
Technical Solutions | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	26	26
Technical Solutions | Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	13	14
Technical Solutions | Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	218	193
Intersegment Elimination
Disaggregation of Revenue [Line Items]
Sales and service revenues	(26)	(26)
Intersegment	(26)	(26)
Intersegment Elimination | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	(26)	(26)
Intersegment Elimination | Intersegment
Disaggregation of Revenue [Line Items]
Sales and service revenues	$ (26)	$ (26)

Revenue (Narrative) (Details)

Revenue (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 40,600
Revenue, performance obligation, recognition percentage, year two	30.00%
Revenue, performance obligation, recognition percentage, year four	25.00%
Increase (Decrease) in Net Contract Assets	$ 218
Contract with Customer, Liability, Revenue Recognized	217
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate
Increase (decrease) in operating income due to net cumulative catch-up adjustments	$ (6)	$ 28
Increase (decrease) in diluted earnings per share due to net cumulative catch-up adjustments	$ (0.11)	$ 0.50

Segment Information (Narrative)

Segment Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2019segments
Segment Reporting [Abstract]
Number of reportable segments	3

Segment Operating Results (Tabl

Segment Operating Results (Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Sales and Service Revenues
Sales and service revenue	$ 2,080	$ 1,874
Operating Income (Loss)
Operating income (loss)	161	191
Operating Segments
Operating Income (Loss)
Operating income (loss)	129	117
Ingalls
Sales and Service Revenues
Sales and service revenue	584	585
Operating Income (Loss)
Operating income (loss)	46	64
Newport News
Sales and Service Revenues
Sales and service revenue	1,265	1,082
Operating Income (Loss)
Operating income (loss)	78	51
Technical Solutions
Sales and Service Revenues
Sales and service revenue	257	233
Operating Income (Loss)
Operating income (loss)	5	2
Intersegment Elimination
Sales and Service Revenues
Sales and service revenue	(26)	(26)
Non-segment factors affecting operating income (loss)
Non-segment factors affecting operating income (loss)
Operating FAS/CAS Adjustment	34	72
Non-current state income taxes	$ (2)	$ 2

Segment Assets (Table) (Details

Segment Assets (Table) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information
Assets	$ 7,000	$ 6,383
Ingalls
Segment Reporting Information
Assets	1,595	1,448
Newport News
Segment Reporting Information
Assets	3,907	3,572
Technical Solutions
Segment Reporting Information
Assets	1,084	734
Corporate
Segment Reporting Information
Assets	$ 414	$ 629

Inventoried Costs, Net (Table)

Inventoried Costs, Net (Table) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Inventoried costs	$ 29	$ 34
Raw material inventory	98	94
Total inventoried costs, net	$ 127	$ 128

Goodwill (Narrative) (Details)

Goodwill (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
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

Change in Carrying Amount of Go

Change in Carrying Amount of Goodwill (Table) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Goodwill [Roll Forward]
Goodwill beginning balance	$ 1,263
Goodwill, acquisitions	133
Goodwill, adjustments	6
Goodwill ending balance	1,402
Ingalls
Goodwill [Roll Forward]
Goodwill beginning balance	175
Goodwill ending balance	175
Newport News
Goodwill [Roll Forward]
Goodwill beginning balance	721
Goodwill ending balance	721
Technical Solutions
Goodwill [Roll Forward]
Goodwill beginning balance	367
Goodwill, acquisitions	133
Goodwill, adjustments	6
Goodwill ending balance	$ 506

Other Intangible Assets (Narrat

Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Aggregate weighted-average amortization period	40 years
Amortization of purchased intangibles	$ 11	$ 9
Expected amortization for purchased intangible assets:
Expected amortization, 2019	47
Expected amortization, 2020	44
Expected amortization, 2021	40
Expected amortization, 2022	37
Expected amortization, 2023	$ 27
Fulcrum IT Services, LLC
Finite-Lived Intangible Assets [Line Items]
Aggregate weighted-average amortization period	7 years
Identifiable intangible assets acquired	$ 49
G2, Inc.
Finite-Lived Intangible Assets [Line Items]
Aggregate weighted-average amortization period			7 years
Identifiable intangible assets acquired			$ 20

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	20.80%	20.00%
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 25

Schedule of Long-term debt (Tab

Schedule of Long-term debt (Table) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt	$ 1,496	$ 1,283
Less unamortized debt issuance costs	(21)	(22)
Senior Notes
Debt Instrument [Line Items]
Less unamortized debt issuance costs	(13)	(14)
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%
Revolving Credit Facility [Member] | HII Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 212

Credit Facility (Narrative) (De

Credit Facility (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Credit Facility
Long-term Debt	$ 1,496	$ 1,283
Unamortized Debt Issuance Expense	21	22
Revolving Credit Facility
Credit Facility
Credit facility revolver	1,250
Line of Credit Facility, Remaining Borrowing Capacity	$ 1,016
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) [Member]
Credit Facility
Spread on variable rate	1.25%
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	$ 22
HII Credit Facility | Revolving Credit Facility
Credit Facility
Debt Instrument, Contractual Term	5 years
Unamortized Debt Issuance Expense	$ 8	$ 8
Debt Instrument, Description of Variable Rate Basis	LIBOR
Revolving Credit Facility | HII Credit Facility
Credit Facility
Long-term Debt	$ 212

Debt Senior Note (Narrative) (D

Debt Senior Note (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term Debt	$ 1,496	$ 1,283
Unamortized Debt Issuance Expense	21	22
Senior Notes
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	13	14
Senior Notes | Senior notes due December 1, 2027, 3.483% [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 600	$ 600
Debt Instrument, Interest Rate, Stated Percentage	3.483%	3.483%
Senior Notes | Senior notes due 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	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt	$ 1,496	$ 1,283
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	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Fair value of long term debt	$ 1,533	$ 1,292
Revolving Credit Facility [Member] | HII Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Four	$ 212

Investigations, Claims, and L_2

Investigations, Claims, and Litigation (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)frigates
Dry dock damages event [Member]
Loss Contingencies
Security related to claim	$ 75
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

Components of Lease Expense (Ta

Components of Lease Expense (Table) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating lease cost	$ 11
Short-term lease cost	5
Variable operating lease cost	1
Operating cash flows from operating leases	(11)
Right-of-Use asset obtained in exchange for new operating lease liability	$ 13
Weighted-average remaining lease term (years) - operating leases	11 years
Weighted-average discount rate - operating leases	4.50%

Future Minimim Operating Lease

Future Minimim Operating Lease Payments (Table) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
2019	$ 46	$ 41
2020	40	36
2021	34	30
2022	27	20
2023	20	13
Thereafter	119	56
Total lease payments	286	$ 196
Less: imputed interest	66
Present value of lease liabilities	$ 220

Commitments and Contingencies (

Commitments and Contingencies (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Commitments and Contingencies
Entity Number of Employees	40,000
Surety Bonds Outstanding
Commitments and Contingencies
Surety bonds outstanding	$ 275
Standby Letters of Credit
Commitments and Contingencies
Letters of credit issued but undrawn	$ 22
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

Employee Pension and Other Po_3

Employee Pension and Other Postretirement Benefits Net Benefit Costs (Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Benefits
Defined Benefit Plan Disclosure
Service cost	$ 36	$ 39
Interest cost	69	64
Expected return on plan assets	(102)	(107)
Amortization of prior service cost (credit)	5	6
Amortization of net actuarial loss (gain)	28	20
Net periodic benefit cost	36	22
Other Benefits
Defined Benefit Plan Disclosure
Service cost	2	2
Interest cost	5	5
Amortization of prior service cost (credit)	(5)	(5)
Amortization of net actuarial loss (gain)	(3)	(1)
Net periodic benefit cost	$ (1)	$ 1

Employee Pension and Other Po_4

Employee Pension and Other Postretirement Benefits Cash Contributions (Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure
Other benefit plans	$ 7	$ 7
Total contributions	10	43
Discretionary Contribution | Qualified
Defined Benefit Plan Disclosure
Pension contributions	1	34
Discretionary Contribution | Non-qualified
Defined Benefit Plan Disclosure
Pension contributions	$ 2	$ 2

Employee Pension and Other Po_5

Employee Pension and Other Postretirement Benefits (Narrative) (Details) $ in Millions	Mar. 31, 2019USD ($)
Retirement Benefits [Abstract]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	$ 21

Stock Compensation Plans (Narra

Stock Compensation Plans (Narrative) (Details) - $ / shares shares in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Stock awards
Stock rights, weighted-average grant date fair value	$ 201.82
Stock awards, vested in the period	0.3	0.2
Stock awards, transferred for employee withholding taxes	0.1	0.1
Restricted performance stock rights
Stock awards
Stock rights, granted	0.1	0.1
Stock rights, weighted-average grant date fair value	$ 210.24	$ 262.76
Restricted performance stock rights | Minimum
Stock awards
Restricted performance stock rights ultimate vesting percentage	0.00%
Restricted performance stock rights | Maximum
Stock awards
Restricted performance stock rights ultimate vesting percentage	200.00%

Schedule of Status of Stock Awa

Schedule of Status of Stock Awards (Table) (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2019$ / sharesshares
Stock awards
Stock awards, outstanding | shares	369
Stock awards, weighted-average grant date fair value | $ / shares	$ 201.82
Stock awards, weighted-average remaining contractual term	1 year 6 months

Stock Compensation Plans Compen

Stock Compensation Plans Compensation and Unrecognized Compensation Expense (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Compensation Expense [Abstract]
Allocated Share-based Compensation Expense	$ 5	$ 7
Tax benefits for stock-based compensation	1	1
Stock Awards [Member]
Compensation Expense [Abstract]
Employee Service Share-Based Compensation, Tax Benefit Realized From Issuance Of Instruments Other Than Options	$ 5	$ 7
Restricted Stock [Member]
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation expense, period for recognition	1 year 1 month
Restricted performance stock rights
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation expense	$ 46
Unrecognized compensation expense, period for recognition	1 year 9 months
Maximum | Restricted Stock [Member]
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation expense	$ 1

Subsidiary Guarantors Narrative

Subsidiary Guarantors Narrative (Details)	3 Months Ended
	Mar. 31, 2019
Subsidiary Guarantors [Abstract]
Parent ownership percentage of subsidiary guarantors	100.00%