Northrop Grumman (NOC) 10-Q 24 Oct 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	9 Months Ended
	Sep. 30, 2019	Oct. 21, 2019
Document and Entity Information [Abstract]
Entity Current Reporting Status	Yes
Document Type	10-Q
Document Fiscal Period Focus	Q3
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Amendment Flag	false
Document Fiscal Year Focus	2019
Current Fiscal Year End Date	--12-31
Entity File Number	1-16411
Entity Registrant Name	NORTHROP GRUMMAN CORP /DE/
Entity Central Index Key	0001133421
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	80-0640649
Entity Address, Line 1	2980 Fairview Park Drive
Entity Address, City Or Town	Falls Church,
Entity Address, State Or Province	VA
Entity Address, Postal ZIP Code	22042
City Area Code	703
Local Phone Number	280-2900
Title of 12(b) Security	Common Stock
Trading Symbol	NOC
Security Exchange Name	NYSE
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		168,532,761

Condensed Consolidated Statemen

Condensed Consolidated Statements of Earnings and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Sales	$ 8,475	$ 8,085	$ 25,120	$ 21,939
Operating costs and expenses
General and administrative expenses	776	817	2,320	2,267
Operating income	951	1,172	2,833	2,837
Other (expense) income
Interest expense	(123)	(133)	(398)	(420)
FAS (non-service) pension benefit	200	270	600	782
Other, net	27	55	82	140
Earnings before income taxes	1,055	1,364	3,117	3,339
Federal and foreign income tax expense	122	120	460	466
Net earnings	$ 933	$ 1,244	$ 2,657	$ 2,873
Basic earnings per share
Basic earnings per share	$ 5.52	$ 7.15	$ 15.67	$ 16.48
Weighted-average common shares outstanding, in millions	169.1	174.1	169.6	174.3
Diluted earnings per share
Diluted earnings per share	$ 5.49	$ 7.11	$ 15.60	$ 16.40
Weighted-average diluted shares outstanding, in millions	169.9	174.9	170.3	175.2
Net earnings (from above)	$ 933	$ 1,244	$ 2,657	$ 2,873
Change in unamortized prior service credit, net of tax	(12)	(15)	(35)	(45)
Change in cumulative translation adjustment and other, net	0	(3)	0	(9)
Other comprehensive loss, net of tax	(12)	(18)	(35)	(54)
Comprehensive income	921	1,226	2,622	2,819
Product [Member]
Sales	5,997	5,614	17,605	14,693
Cost of Sales	4,777	4,233	13,955	11,200
Service [Member]
Sales	2,478	2,471	7,515	7,246
Cost of Sales	$ 1,971	$ 1,863	$ 6,012	$ 5,635

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Financial Position (Unaudited) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 1,127	$ 1,579
Accounts receivable, net	2,111	1,448
Unbilled receivables, net	5,777	5,026
Inventoried costs, net	810	654
Prepaid expenses and other current assets	1,011	973
Total current assets	10,836	9,680
Property, plant and equipment, net of accumulated depreciation of $5,709 for 2019 and $5,369 for 2018	6,611	6,372
Operating lease right-of-use assets	1,511	0
Goodwill	18,707	18,672
Intangible assets, net	1,123	1,372
Deferred tax assets	83	94
Other non-current assets	1,682	1,463
Total assets	40,553	37,653
Liabilities
Trade accounts payable	2,021	2,182
Accrued employee compensation	1,744	1,676
Advance payments and billings in excess of costs incurred	2,127	1,917
Other current liabilities	2,524	2,499
Total current liabilities	8,416	8,274
Long-term debt, net of current portion of $45 for 2019 and $517 for 2018	13,826	13,883
Pension and other postretirement benefit plan liabilities	5,431	5,755
Operating lease liabilities	1,304	0
Deferred tax liabilities	111	108
Other non-current liabilities	1,734	1,446
Total liabilities	30,822	29,466
Commitments and contingencies (Note 7)
Shareholders’ equity
Preferred stock, $1 par value; 10,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $1 par value; 800,000,000 shares authorized; issued and outstanding: 2019—168,701,653 and 2018—170,607,336	169	171
Paid-in capital	0	0
Retained earnings	9,649	8,068
Accumulated other comprehensive loss	(87)	(52)
Total shareholders’ equity	9,731	8,187
Total liabilities and shareholders’ equity	$ 40,553	$ 37,653

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Financial Position (Unaudited) (Parentheticals) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accumulated depreciation	$ (5,709)	$ (5,369)
Long-term debt, current portion	$ 45	$ 517
Preferred Stock, par value	$ 1	$ 1
Preferred Stock, shares authorized	10,000,000	10,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common Stock, par value	$ 1	$ 1
Common Stock, shares authorized	800,000,000	800,000,000
Common Stock, shares issued	168,701,653	170,607,336
Common Stock, shares outstanding	168,701,653	170,607,336

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities
Net earnings	$ 2,657	$ 2,873
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	737	534
Non-cash lease expense	187	0
Stock-based compensation	93	82
Deferred income taxes	24	275
Changes in assets and liabilities:
Accounts receivable, net	(663)	(52)
Unbilled receivables, net	(778)	(898)
Inventoried costs, net	(156)	(102)
Prepaid expenses and other assets	(81)	(109)
Accounts payable and other liabilities	320	(125)
Income taxes payable, net	(34)	(114)
Retiree benefits	(422)	(847)
Other, net	(51)	(67)
Net cash provided by operating activities	1,833	1,450
Investing activities
Acquisition of Orbital ATK, net of cash acquired	0	(7,657)
Capital expenditures	(793)	(786)
Other, net	8	23
Net cash used in investing activities	(785)	(8,420)
Financing activities
Payments of long-term debt	(500)	(2,276)
Net payments to credit facilities	(31)	(314)
Net borrowings on commercial paper	201	499
Common stock repurchases	(444)	(209)
Cash dividends paid	(658)	(616)
Payments of employee taxes withheld from share-based awards	(63)	(84)
Other, net	(5)	(27)
Net cash used in financing activities	(1,500)	(3,027)
Decrease in cash and cash equivalents	(452)	(9,997)
Cash and cash equivalents, beginning of year	1,579	11,225
Cash and cash equivalents, end of period	$ 1,127	$ 1,228

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common stock	Paid-in capital	Retained earnings	Accumulated other comprehensive (loss) income
Beginning of period at Dec. 31, 2017		$ 174	$ 44	$ 6,913	$ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact from adoption of ASU 2018-02 and ASU 2016-01				(21)	21
Common stock repurchased		(1)	(34)	(179)
Net earnings	$ 2,873			2,873
Dividends declared				(616)
Stock compensation		1	(10)	(9)
Other comprehensive loss, net of tax	(54)				(54)
End of period at Sep. 30, 2018	$ 9,103	174	0	8,961	(32)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 3.50
Beginning of period at Jun. 30, 2018		174	0	8,066	(14)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact from adoption of ASU 2018-02 and ASU 2016-01				0	0
Common stock repurchased		(1)	0	(164)
Net earnings	$ 1,244			1,244
Dividends declared				(211)
Stock compensation		1	0	26
Other comprehensive loss, net of tax	(18)				(18)
End of period at Sep. 30, 2018	$ 9,103	174	0	8,961	(32)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.20
Beginning of period at Dec. 31, 2018	$ 8,187	171	0	8,068	(52)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact from adoption of ASU 2018-02 and ASU 2016-01				0	0
Common stock repurchased		(2)	0	(449)
Net earnings	2,657			2,657
Dividends declared				(658)
Stock compensation		0	0	31
Other comprehensive loss, net of tax	(35)				(35)
End of period at Sep. 30, 2019	$ 9,731	169	0	9,649	(87)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 3.84
Beginning of period at Jun. 30, 2019		169	0	9,120	(75)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact from adoption of ASU 2018-02 and ASU 2016-01				0	0
Common stock repurchased		0	0	(215)
Net earnings	$ 933			933
Dividends declared				(226)
Stock compensation		0	0	37
Other comprehensive loss, net of tax	(12)				(12)
End of period at Sep. 30, 2019	$ 9,731	$ 169	$ 0	$ 9,649	$ (87)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.32

Basis of Presentation (Unaudite

Basis of Presentation (Unaudited)	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION Principles of Consolidation and Reporting These unaudited condensed consolidated financial statements (the “financial statements”) include the accounts of Northrop Grumman Corporation and its subsidiaries and joint ventures or other investments for which we consolidate the financial results (herein referred to as “Northrop Grumman,” the “company,” “we,” “us,” or “our”). Material intercompany accounts, transactions and profits are eliminated in consolidation. Investments in equity securities and joint ventures where the company has significant influence, but not control, are accounted for using the equity method. On June 6, 2018 (the “Merger date”), the company completed its previously announced acquisition of Orbital ATK, Inc. (“Orbital ATK”) (the “Merger”) . On the Merger date, Orbital ATK became a wholly-owned subsidiary of the company and its name was changed to Northrop Grumman Innovation Systems, Inc., which we established as a new, fourth business sector (“Innovation Systems”) . The operating results of Innovation Systems subsequent to the Merger date have been included in the company’s unaudited condensed consolidated results of operations. See N ote 2 for further information regarding the Merger. At September 30, 2019, the company was aligned in four operating sectors: Aerospace Systems, Innovation Systems, Mission Systems and Technology Services. In September 2019, the company announced changes effective January 1, 2020, which are intended to better align the company’s broad portfolio to serve its customers’ needs. There will be four sectors: Aeronautics Systems, Defense Systems, Mission Systems and Space Systems. This realignment is not reflected in any of the accompanying financial information. These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP” or “FAS”) and in accordance with the rules of the Securities and Exchange Commission (SEC) for interim reporting. The financial statements include adjustments of a normal recurring nature considered necessary by management for a fair presentation of the company’s unaudited condensed consolidated financial position, results of operations and cash flows. The results reported in these financial statements are not necessarily indicative of results that may be expected for the entire year. These financial statements should be read in conjunction with the information contained in the company’s 2018 Annual Report on Form 10-K. 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 the company’s long-standing practice to establish actual interim closing dates using a “fiscal” calendar, in which we close our books on a Friday near these quarter-end dates in order to normalize the potentially disruptive effects of quarterly closings on business processes. This practice is only used at interim periods within a reporting year. As previously announced, effective January 1, 2019, we adopted Accounting Standards Codification (ASC) Topic 842, Leases , using the optional transition method to apply the standard through a cumulative effect adjustment in the period of adoption. The adoption of this standard is reflected in the amounts and disclosures set forth in this Form 10-Q. Accounting Estimates Preparation of the 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 sales and expenses during the reporting period. Estimates have been prepared using the most current and best available information; however, actual results could differ materially from those estimates. Revenue Recognition The majority of our sales are derived from long-term contracts with the U.S. government for the production of goods, the provision of services, or a combination of both. The company classifies sales as product or service based on the predominant attributes of each performance obligation. The company recognizes revenue for each separately identifiable performance obligation in a contract representing a promise to transfer a distinct good or service to a customer. In most cases, goods and services provided under the company’s contracts are accounted for as single performance obligations due to the complex and integrated nature of our products and services. These contracts generally require significant integration of a group of goods and/or services to deliver a combined output. In some contracts, the company provides multiple distinct goods or services to a customer, most commonly when a contract covers multiple phases of the product lifecycle (e.g., development, production, sustainment, etc.). In those cases, the company accounts for the distinct contract deliverables as separate performance obligations and allocates the transaction price to each performance obligation based on its relative standalone selling price, which is generally estimated using a cost plus a reasonable margin approach. Warranties are provided on certain contracts, but do not typically provide for services beyond standard assurances and are therefore not considered to be separate performance obligations. Assets recognized from the costs to obtain or fulfill a contract are not material. Contracts are often modified for changes in contract specifications or requirements, which may result in scope and/or price changes. Most of the company’s contract modifications are for goods or services that are not distinct in the context of the contract and are therefore accounted for as part of the original performance obligation through a cumulative estimate-at-completion (EAC) adjustment. The company recognizes revenue as control is transferred to the customer, either over time or at a point in time. In general, our U.S. government contracts contain termination for convenience and/or other clauses that generally provide the customer rights to goods produced and/or in-process. Similarly, our non-U.S. government contracts generally contain contractual termination clauses or entitle the company to payment for work performed to date for goods and services that do not have an alternative use. As control is effectively transferred while we perform on our contracts, we generally recognize revenue over time using the cost-to-cost method (cost incurred relative to total cost estimated at completion) as the company believes this represents the most appropriate measurement towards satisfaction of its performance obligations. Revenue for contracts in which the control of goods produced does not transfer until delivery to the customer is recognized at a point in time (i.e., typically upon delivery). Contract Estimates Use of the cost-to-cost method requires us to make reasonably dependable estimates regarding the revenue and cost associated with the design, manufacture and delivery of our products and services. The company estimates profit on these contracts as the difference between total estimated sales and total estimated cost at completion and recognizes that profit as costs are incurred. Significant judgment is used to estimate total sales and cost at completion. Contract sales may include estimates of variable consideration, including cost or performance incentives (such as award and incentive fees), contract claims and requests for equitable adjustment (REAs). Variable consideration is included in total estimated sales to the extent it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. We estimate variable consideration as the most likely amount to which we expect to be entitled. We recognize changes in estimated contract sales or costs and the resulting changes in contract profit on a cumulative basis. Cumulative EAC adjustments represent the cumulative effect of the changes on current and prior periods; sales and operating margins in future periods are recognized as if the revised estimates had been used since contract inception. If it is determined that a loss is expected to result on an individual performance obligation, the entire amount of the estimable future loss, including an allocation of general and administrative (G&A) costs, is charged against income in the period the loss is identified. Each loss provision is first offset against costs included in Unbilled receivables or Inventoried costs; remaining amounts are reflected in Other current liabilities. The following table presents the effect of aggregate net EAC adjustments: Three Months Ended September 30 Nine Months Ended September 30 $ in millions, except per share data 2019 2018 2019 2018 Revenue $ 142 $ 149 $ 462 $ 438 Operating income 125 149 421 408 Net earnings (1) 99 117 333 322 Diluted earnings per share (1) 0.58 0.67 1.96 1.84 (1) Based on a 21 percent statutory tax rate. EAC adjustments on a single performance obligation can have a material effect on the company’s financial statements. When such adjustments occur, we generally disclose the nature, underlying conditions and financial impact of the adjustments. No such adjustments were material to the financial statements during the three months ended September 30, 2019 and 2018 . Backlog Backlog represents the future sales we expect to recognize on firm orders received by the company and is equivalent to the company’s remaining performance obligations at the end of each period. It comprises both funded backlog (firm orders for which funding is authorized and appropriated) and unfunded backlog. Unexercised contract options and indefinite delivery indefinite quantity (IDIQ) contracts are not included in backlog until the time the option or IDIQ task order is exercised or awarded. Company backlog as of September 30, 2019 was $65.0 billion . We expect to recognize approximately 40 percent and 65 percent of our September 30, 2019 backlog as revenue over the next 12 and 24 months, respectively, with the remainder to be recognized thereafter. Contract Assets and Liabilities For each of the company’s contracts, the timing of revenue recognition, customer billings, and cash collections results in a net contract asset or liability at the end of each reporting period. Fixed-price contracts are typically billed to the customer either using 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 assets are equivalent to and reflected as Unbilled receivables in the unaudited condensed consolidated statements of financial position and are primarily related to long-term contracts where revenue recognized under the cost-to-cost method exceeds amounts billed to customers. Unbilled receivables 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-cycle nature of many of our contracts. Accumulated contract costs in unbilled receivables include costs such as direct production costs, factory and engineering overhead, production tooling costs, and allowable G&A. Unbilled receivables also include certain estimates of variable consideration described above. These contract assets are not considered a significant financing component of the company’s contracts as the payment terms are intended to protect the customer in the event the company does not perform on its obligations under the contract. Contract liabilities are equivalent to and reflected as Advance payments and billings in excess of costs incurred in the unaudited condensed consolidated statements of financial position. Certain customers make advance payments prior to the company’s satisfaction of its obligations on the contract. These amounts are recorded as contract liabilities until such obligations are satisfied, either over time as costs are incurred or at a point in time when deliveries are made. Contract liabilities are not a significant financing component as they are generally utilized to pay for contract costs within a one-year period or are used to ensure the customer meets contractual requirements. The amount of revenue recognized for the three and nine months ended September 30, 2019 that was included in the December 31, 2018 contract liability balance was $209 million and $1.2 billion , respectively. The amount of revenue recognized for the three and nine months ended September 30, 2018 that was included in the December 31, 2017 contract liability balance was $168 million and $1.2 billion , respectively. Disaggregation of Revenue See Note 11 for information regarding the company’s sales by customer type, contract type and geographic region for each of our segments. We believe those categories best depict how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss are as follows: $ in millions September 30, December 31, Unamortized prior service credit, net of tax expense of $21 for 2019 and $32 for 2018 $ 63 $ 98 Cumulative translation adjustment (148 ) (144 ) Other, net (2 ) (6 ) Total accumulated other comprehensive loss $ (87 ) $ (52 ) Reclassifications from accumulated other comprehensive loss to net earnings related to the amortization of prior service credit were $12 million and $35 million , net of taxes, for the three and nine months ended September 30, 2019 , respectively and were $15 million and $45 million , net of taxes, for the three and nine months ended September 30, 2018 , respectively. The reclassifications are included in the computation of net periodic pension cost (benefit). See Note 8 for further information. Reclassifications from accumulated other comprehensive loss to net earnings relating to cumulative translation adjustments and effective cash flow hedges were not material for the three and nine months ended September 30, 2019 and 2018 . Leases The company leases certain buildings, land and equipment. Under ASC 842, at contract inception we determine whether the contract is or contains a lease and whether the lease should be classified as an operating or a finance lease. Operating leases are included in Operating lease right-of-use assets, Other current liabilities, and Operating lease liabilities in our unaudited condensed consolidated statements of financial position. The company recognizes operating lease right-of-use assets and operating lease liabilities based on the present value of the future minimum lease payments over the lease term at commencement date. We use our incremental borrowing rate based on the information available at commencement date to determine the present value of future payments and the appropriate lease classification. Many of our leases include renewal options aligned with our contract terms. We define the initial lease term to include renewal options determined to be reasonably certain. In our adoption of ASC 842, we elected not to recognize a right-of-use asset and a lease liability for leases with an initial term of 12 months or less; we recognize lease expense for these leases on a straight-line basis over the lease term. We elected the practical expedient to not separate lease components from nonlease components and applied that practical expedient to all material classes of leased assets. Many of the company’s real property lease agreements contain incentives for tenant improvements, rent holidays or rent escalation clauses. For tenant improvement incentives, if the incentive is determined to be a leasehold improvement owned by the lessee, the company generally records a deferred rent liability and amortizes the deferred rent over the term of the lease as a reduction to rent expense. For rent holidays and rent escalation clauses during the lease term, the company records rental expense on a straight-line basis over the term of the lease. For these lease incentives, the company uses the date of initial possession as the commencement date, which is generally when the company is given the right of access to the space and begins to make improvements in preparation for intended use. Finance leases are not material to our unaudited condensed consolidated financial statements and the company is not a lessor in any material arrangements. We do not have any material restrictions or covenants in our lease agreements, sale-leaseback transactions, land easements or residual value guarantees. Related Party Transactions The company had no material related party transactions in any period presented. Accounting Standards Updates On February 25, 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) . ASC Topic 842 supersedes existing lease guidance, including ASC 840 - Leases . Among other things, ASU 2016-02 requires recognition of a right-of-use asset and liability for future lease payments for contracts that meet the definition of a lease and requires disclosure of certain information about leasing arrangements. On July 30, 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements , which, among other things, allows companies to elect an optional transition method to apply the new lease standard through a cumulative-effect adjustment in the period of adoption. We adopted the standard on January 1, 2019 using the optional transition method and, as a result, did not recast prior period unaudited condensed consolidated comparative financial statements. All prior period amounts and disclosures are presented under ASC 840. We elected the package of practical expedients, which, among other things, allows us to carry forward our prior lease classifications under ASC 840. We did not elect to adopt the hindsight practical expedient and are therefore maintaining the lease terms we previously determined under ASC 840. Adoption of the new standard resulted in the recording of additional lease assets and lease liabilities on the unaudited condensed consolidated statements of financial position with no cumulative impact to retained earnings and did not have a material impact on our results of operations or cash flows. Other accounting standards updates adopted and/or issued, but not effective until after September 30, 2019 , are not expected to have a material effect on the company’s unaudited condensed consolidated financial position, annual results of operations and/or cash flows.

Business Acquisition (Unaudited

Business Acquisition (Unaudited) Business Acquisition (Unaudited)	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	ACQUISITION OF ORBITAL ATK On June 6, 2018 , the company completed its previously announced acquisition of Orbital ATK, by acquiring all of the outstanding shares of Orbital ATK for a purchase price of $7.7 billion in cash. On the Merger date, Orbital ATK became a wholly-owned subsidiary of the company and its name was changed to Northrop Grumman Innovation Systems, Inc. We established Innovation Systems as a new, fourth business sector. Its main products include precision munitions and armaments; tactical missiles and subsystems; ammunition; launch vehicles; space and strategic propulsion systems; aerospace structures; space exploration products; and national security and commercial satellite systems and related components/services. The acquisition was financed with proceeds from the company’s debt financing completed in October 2017 and cash on hand. We believe this acquisition will enable us to broaden our capabilities and offerings, provide additional innovative solutions to meet our customers’ emerging requirements, create value for shareholders and provide expanded opportunities for our combined employees. Purchase Price Allocation The acquisition was accounted for as a purchase business combination. As such, the company recorded the assets acquired and liabilities assumed at fair value, with the excess of the purchase price over the fair value of assets acquired and liabilities assumed recorded as goodwill. Determining the fair value of assets acquired and liabilities assumed requires significant judgment, including the amount and timing of expected future cash flows, long-term growth rates and discount rates. In some cases, the company used discounted cash flow analyses, which were based on our best estimate of future sales, earnings and cash flows after considering such factors as general market conditions, customer budgets, existing firm and future orders, changes in working capital, long term business plans and recent operating performance. Use of different estimates and judgments could yield materially different results. During the second quarter of 2019, the company finalized its determination of the fair values of the assets acquired and liabilities assumed as of the Merger date. Based on additional information obtained during the measurement period, the company refined its initial assessment of fair value and recognized the following significant adjustments to its preliminary purchase price allocation: Intangible assets increased $220 million , Other current liabilities increased $114 million , Pension and other postretirement benefit (OPB) plan liabilities increased $56 million , Other non-current liabilities increased $53 million , Other current assets increased $44 million and Goodwill decreased $36 million . These adjustments did not result in a material impact on the financial results of prior periods. The Merger date fair value of the consideration transferred totaled $7.7 billion in cash, which was comprised of the following: $ in millions, except per share amounts Purchase price Shares of Orbital ATK common stock outstanding as of the Merger date 57,562,152 Cash consideration per share of Orbital ATK common stock $ 134.50 Total purchase price $ 7,742 The following purchase price allocation table presents the company’s final determination of the fair values of assets acquired and liabilities assumed at the Merger date: $ in millions As of June 6, 2018 Cash and cash equivalents $ 85 Accounts receivable 596 Unbilled receivables 1,237 Inventoried costs 220 Other current assets 237 Property, plant and equipment 1,509 Goodwill 6,259 Intangible assets 1,525 Other non-current assets 151 Total assets acquired 11,819 Trade accounts payable (397 ) Accrued employee compensation (158 ) Advance payments and billings in excess of costs incurred (222 ) Below market contracts (1) (151 ) Other current liabilities (412 ) Long-term debt (1,687 ) Pension and OPB plan liabilities (613 ) Deferred tax liabilities (248 ) Other non-current liabilities (189 ) Total liabilities assumed (4,077 ) Total purchase price $ 7,742 (1) Included in Other current liabilities in the unaudited condensed consolidated statements of financial position. The following table presents a summary of purchased intangible assets and their related estimated useful lives: Fair Value (in millions) Estimated Useful Life in Years Customer contracts $ 1,245 9 Commercial customer relationships 280 13 Total customer-related intangible assets $ 1,525 The purchase price allocation resulted in the recognition of $6.3 billion of goodwill, a majority of which was allocated to the Innovation Systems sector. The goodwill recognized is attributable to expected revenue synergies generated by the integration of Aerospace Systems, Mission Systems and Technology Services products and technologies with those of legacy Orbital ATK, synergies resulting from the consolidation or elimination of certain costs, and intangible assets that do not qualify for separate recognition, such as the assembled workforce of Orbital ATK. None of the goodwill is expected to be deductible for tax purposes. Unaudited Supplemental Pro Forma Information The following table presents unaudited pro forma financial information prepared in accordance with Article 11 of Regulation S-X and computed as if Orbital ATK had been included in our results as of January 1, 2017 : $ in millions, except per share amounts Nine Months Ended September 30, 2018 Sales $ 24,163 Net earnings 3,050 Diluted earnings per share 17.41 The unaudited supplemental pro forma financial data has been calculated after applying our accounting policies and adjusting the historical results of Orbital ATK with pro forma adjustments, net of tax, that assume the acquisition occurred on January 1, 2017. Significant pro forma adjustments include the following: 1. The elimination of intercompany sales and costs of sales between the company and Orbital ATK of $80 million for the nine months ended September 30, 2018 . 2. The elimination of nonrecurring transaction costs incurred by the company and Orbital ATK in connection with the Merger of $71 million for the nine months ended September 30, 2018 . 3. The recognition of additional depreciation expense, net of removal of historical depreciation expense, of $10 million for the nine months ended September 30, 2018 related to the step-up in fair value of acquired property, plant and equipment. 4. The recognition of additional amortization expense, net of removal of historical amortization expense, of $101 million for the nine months ended September 30, 2018 related to the fair value of acquired intangible assets. 5. The elimination of Orbital ATK’s historical amortization of net actuarial losses and prior service credits and impact of the revised pension and OPB net periodic benefit cost as determined under the company’s plan assumptions of $51 million for the nine months ended September 30, 2018 . 6. The income tax effect on the pro forma adjustments, which was calculated using the federal statutory tax rate, of $(2) million for the nine months ended September 30, 2018 . The unaudited pro forma financial information does not reflect the potential realization of revenue synergies or cost savings, nor does it reflect other costs relating to the integration of the two companies. This unaudited pro forma financial information should not be considered indicative of the results that would have actually occurred if the acquisition had been consummated on January 1, 2017, nor are they indicative of future results.

Earnings Per Share, Share Repur

Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited)	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
EARNINGS PER SHARE, SHARE REPURCHASES AND DIVIDENDS ON COMMON STOCK	EARNINGS PER SHARE, SHARE REPURCHASES AND DIVIDENDS ON COMMON STOCK Basic Earnings Per Share We calculate basic earnings per share by dividing net earnings by the weighted-average number of shares of common stock outstanding during each period. Diluted Earnings Per Share Diluted earnings per share include the dilutive effect of awards granted to employees under stock-based compensation plans. The dilutive effect of these securities totaled 0.8 million shares and 0.7 million shares for the three and nine months ended September 30, 2019 . The dilutive effect of these securities totaled 0.8 million shares and 0.9 million shares for the three and nine months ended September 30, 2018 , respectively. Share Repurchases On September 16, 2015, the company’s board of directors authorized a share repurchase program of up to $4.0 billion of the company’s common stock (the “2015 Repurchase Program”). Repurchases under the 2015 Repurchase Program commenced in March 2016. On December 4, 2018, the company’s board of directors authorized a new share repurchase program of up to an additional $3.0 billion in share repurchases of the company’s common stock (the “2018 Repurchase Program”). By its terms, repurchases under the 2018 Repurchase Program will commence upon completion of the 2015 Repurchase Program and will expire when we have used all authorized funds for repurchases. During the fourth quarter of 2018, the company entered into an accelerated share repurchase (ASR) agreement with Goldman Sachs & Co. LLC (Goldman Sachs) to repurchase $1.0 billion of the company’s common stock under the 2015 Repurchase Program. Under the agreement, we made a payment of $1.0 billion to Goldman Sachs and received an initial delivery of 3.0 million shares valued at $800 million that were immediately canceled by the company. The remaining balance was settled on January 4, 2019 with a final delivery of 0.9 million shares from Goldman Sachs. The final average purchase price was $260.32 per share. As of September 30, 2019 , repurchases under the 2015 Repurchase Program totaled $3.4 billion ; $0.6 billion remained under this share repurchase authorization. By its terms, the 2015 Repurchase Program is set to expire when we have used all authorized funds for repurchases. Share repurchases take place from time to time, subject to market conditions and management’s discretion, in the open market and in privately negotiated transactions. The company retires its common stock upon repurchase and, in the periods presented, has not made any purchases of common stock other than in connection with these publicly announced repurchase programs. The table below summarizes the company’s share repurchases to date under the authorizations described above: Shares Repurchased Repurchase Program Amount Total Average (1) Date Completed Nine Months Ended September 30 2019 2018 September 16, 2015 $ 4,000 13.6 $ 248.91 2.3 0.7 December 4, 2018 $ 3,000 — — — — (1) Includes commissions paid. Dividends on Common Stock In May 2019, the company increased the quarterly common stock dividend 10 percent to $1.32 per share from the previous amount of $1.20 per share. In May 2018, the company increased the quarterly common stock dividend 9 percent to $1.20 per share from the previous amount of $1.10 per share. In January 2018, the company increased the quarterly common stock dividend 10 percent to $1.10 per share from the previous amount of $1.00 per share.

Income Taxes (Unaudited)

Income Taxes (Unaudited)	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES Three Months Ended September 30 Nine Months Ended September 30 $ in millions 2019 2018 2019 2018 Federal and foreign income tax expense $ 122 $ 120 $ 460 $ 466 Effective income tax rate 11.6 % 8.8 % 14.8 % 14.0 % Current Quarter The third quarter 2019 effective tax rate increased to 11.6 percent from 8.8 percent in the third quarter of 2018 . The company’s effective tax rate for the third quarter of 2019 includes benefits of $89 million for research credits and $17 million for foreign derived intangible income. The company’s tax rate for the third quarter of 2018 included a $106 million benefit for research credits and manufacturing deductions and an $84 million benefit associated with the Tax Cuts and Jobs Act (the “2017 Tax Act”). Year to Date The year to date 2019 effective tax rate increased to 14.8 percent from 14.0 percent in the prior year period. The company’s year to date 2019 effective tax rate includes benefits of $171 million for research credits and $26 million for foreign derived intangible income. The company’s year to date 2018 effective tax rate included a $156 million benefit for research credits and manufacturing deductions and an $84 million benefit associated with the 2017 Tax Act. During the three and nine months ended September 30, 2019 , we increased our unrecognized tax benefits by approximately $294 million and $327 million , respectively, related to our methods of accounting associated with the timing of revenue recognition and related costs, and the 2017 Tax Act. Since enactment of the 2017 Tax Act, the IRS and U.S. Treasury Department have issued and are expected to further issue interpretive guidance that impacts taxpayers. We will continue to evaluate such guidance as it is issued. We file income tax returns in the U.S. federal jurisdiction and in various state and foreign jurisdictions. The Northrop Grumman 2014-2017 federal tax returns and refund claims related to its 2007-2016 federal tax returns are currently under IRS examination. In addition, legacy Orbital ATK federal tax returns for the year ended March 31, 2015, the nine-month transition period ended December 31, 2015 and calendar years 2016-2017 are currently under IRS examination.

Fair Value of Financial Instrum

Fair Value of Financial Instruments (Unaudited)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
FAIR VALUE OF FINANCIAL INSTRUMENTS	FAIR VALUE OF FINANCIAL INSTRUMENTS The company holds a portfolio of marketable securities consisting of securities to partially fund non-qualified employee benefit plans. A portion of these securities are held in common/collective trust funds and are measured at fair value using net asset value (NAV) per share as a practical expedient; and therefore are not required to be categorized in the fair value hierarchy table below. Marketable securities are included in Other non-current assets in the unaudited condensed consolidated statements of financial position. The company’s derivative portfolio consists primarily of commodity forward contracts and foreign currency forward contracts. The company periodically uses commodity forward contracts to hedge forecasted purchases of certain commodities. The contracts generally establish a fixed price for the underlying commodity and are designated and qualify as effective cash flow hedges of such commodity purchases. Commodity derivatives are valued based on prices of future exchanges and recently reported transactions in the marketplace. For foreign currency forward contracts, where model-derived valuations are appropriate, the company utilizes the income approach to determine the fair value and uses the applicable London Interbank Offered Rate (LIBOR) swap rates. The following table presents the financial assets and liabilities the company records at fair value on a recurring basis identified by the level of inputs used to determine fair value: September 30, 2019 December 31, 2018 $ in millions Level 1 Level 2 Total Level 1 Level 2 Total Financial Assets (Liabilities) Marketable securities $ 351 $ — $ 351 $ 319 $ 1 $ 320 Marketable securities valued using NAV 16 15 Total marketable securities 351 — 367 319 1 335 Derivatives — (5 ) (5 ) — (10 ) (10 ) At September 30, 2019 , the company had commodity forward contracts outstanding that hedge forecasted commodity purchases of 4 million pounds of copper and 1 million pounds of zinc. Gains or losses on the commodity forward contracts are recognized in product and service cost as the performance obligations on related contracts are satisfied. The notional value of the company’s foreign currency forward contracts at September 30, 2019 and December 31, 2018 was $86 million and $114 million , respectively. The portion of notional value designated as a cash flow hedge at September 30, 2019 was $9 million . At December 31, 2018 , no portion of the notional value was designated as a cash flow hedge. The derivative fair values and related unrealized gains/losses at September 30, 2019 and December 31, 2018 were not material. There were no transfers of financial instruments between the three levels of the fair value hierarchy during the nine months ended September 30, 2019 . The carrying value of cash and cash equivalents and commercial paper approximates fair value. Long-term Debt The estimated fair value of long-term debt was $15.2 billion and $14.3 billion as of September 30, 2019 and December 31, 2018 , respectively. We calculated the fair value of long-term debt using Level 2 inputs, based on interest rates available for debt with terms and maturities similar to the company’s existing debt arrangements. The carrying value of long-term debt was $13.9 billion and $14.4 billion as of September 30, 2019 and December 31, 2018 , respectively. The current portion of long-term debt is recorded in Other current liabilities in the unaudited condensed consolidated statements of financial position.

Investigations, Claims and Liti

Investigations, Claims and Litigation (Unaudited)	9 Months Ended
	Sep. 30, 2019
Disclosure Text Block Supplement [Abstract]
INVESTIGATIONS, CLAIMS AND LITIGATION	INVESTIGATIONS, CLAIMS AND LITIGATION On May 4, 2012, the company commenced an action, Northrop Grumman Systems Corp. v. United States , in the U.S. Court of Federal Claims. This lawsuit relates to an approximately $875 million firm fixed-price contract awarded to the company in 2007 by the U.S. Postal Service (USPS) for the construction and delivery of flats sequencing systems (FSS) as part of the postal automation program. The FSS have been delivered. The company’s lawsuit is based on various theories of liability. The complaint seeks approximately $63 million for unpaid portions of the contract price, and approximately $115 million based on the company’s assertions that, through various acts and omissions over the life of the contract, the USPS adversely affected the cost and schedule of performance and materially altered the company’s obligations under the contract. The United States responded to the company’s complaint with an answer, denying most of the company’s claims, and counterclaims seeking approximately $410 million , less certain amounts outstanding under the contract. The principal counterclaim alleges that the company delayed its performance and caused damages to the USPS because USPS did not realize certain costs savings as early as it had expected. On April 2, 2013, the U.S. Department of Justice informed the company of a False Claims Act complaint relating to the FSS contract that was filed under seal by a relator in June 2011 in the U.S. District Court for the Eastern District of Virginia. On June 3, 2013, the United States filed a Notice informing the Court that the United States had decided not to intervene in this case. The relator alleged that the company violated the False Claims Act in a number of ways with respect to the FSS contract, alleged damage to the USPS in an amount of at least approximately $179 million annually, alleged that he was improperly discharged in retaliation, and sought an unspecified partial refund of the contract purchase price, penalties, attorney’s fees and other costs of suit. The relator later voluntarily dismissed his retaliation claim and reasserted it in a separate arbitration, which he also ultimately voluntarily dismissed. On September 5, 2014, the court granted the company’s motion for summary judgment and ordered the relator’s False Claims Act case be dismissed with prejudice. On February 16, 2018, both the company and the United States filed motions to dismiss many of the claims and counterclaims referenced above, in whole or in part. The United States also filed a motion seeking to amend its answer and counterclaim, including to reduce its counterclaim to approximately $193 million , which the court granted on June 11, 2018. On October 17, 2018, the court granted in part and denied in part the parties’ motions to dismiss. On December 17, 2018, the court issued a Scheduling Order, proposed by the parties, providing for the parties to engage in mediation through March 1, 2019. After the government shutdown, the mediation was rescheduled for May 2019. The parties filed joint motions to suspend the deadlines for pretrial activities while the parties engage in mediation. On April 29, 2019 and June 5, 2019, the court issued Orders suspending the deadlines. Those suspensions ended on July 1, 2019, and on July 12, 2019, the court issued an Order scheduling trial to commence on February 3, 2020. Although the ultimate outcome of these matters (“the FSS matters,” collectively), including any possible loss, cannot be predicted or reasonably estimated at this time, the company intends vigorously to pursue and defend the FSS matters. On August 8, 2013, the company received a court-appointed expert’s report in litigation pending in the Second Federal Court of the Federal District in Brazil brought by the Brazilian Post and Telegraph Corporation (ECT), a Brazilian state-owned entity, against Solystic SAS (Solystic), a French subsidiary of the company, and two of its consortium partners. In this suit, commenced on December 17, 2004, and relatively inactive for some period of time, ECT alleges the consortium breached its contract with ECT and seeks damages of approximately R$111 million (the equivalent of approximately $27 million as of September 30, 2019 ), plus interest, inflation adjustments and attorneys’ fees, as authorized by Brazilian law, which amounts could be significant over time. The original suit sought R$89 million (the equivalent of approximately $21 million as of September 30, 2019 ) in damages. In October 2013, ECT asserted an additional damage claim of R$22 million (the equivalent of approximately $5 million as of September 30, 2019 ). In its counterclaim, Solystic alleges ECT breached the contract by wrongfully refusing to accept the equipment Solystic had designed and built and seeks damages of approximately €31 million (the equivalent of approximately $34 million as of September 30, 2019 ), plus interest, inflation adjustments and attorneys’ fees, as authorized by Brazilian law. The Brazilian court retained an expert to consider certain issues pending before it. On August 8, 2013 and September 10, 2014, the company received reports from the expert, which contain some recommended findings relating to liability and the damages calculations put forth by ECT. Some of the expert’s recommended findings were favorable to the company and others were favorable to ECT. In November 2014, the parties submitted comments on the expert’s most recent report. On June 16, 2015, the court published a decision denying the parties’ request to present oral testimony. In a decision dated November 13, 2018, the trial court ruled in ECT’s favor on one of its claims against Solystic, and awarded damages of R$41 million (the equivalent of approximately $10 million as of September 30, 2019 ) against Solystic and its consortium partners, with that amount to be adjusted for inflation and interest from November 2004 through any appeal, in accordance with the Manual of Calculations of the Federal Justice, as well as attorneys’ fees. On March 22, 2019, ECT appealed the trial court’s decision to the intermediate court of appeals. Solystic filed its appeal on April 11, 2019. The parties are exploring whether there is a possible path for a negotiated resolution of the dispute. We are engaged in remediation activities relating to environmental conditions allegedly resulting from historic operations at the former United States Navy and Grumman facilities in Bethpage, New York. For over 20 years, we have worked closely with the United States Navy, the United States Environmental Protection Agency, the New York State Department of Environmental Conservation, the New York State Department of Health and other federal, state and local governmental authorities, to address legacy environmental conditions in Bethpage. We have incurred, and expect to continue to incur, as included in Note 7 , substantial remediation costs related to these environmental conditions. The remediation standards or requirements to which we are subject are being reconsidered and may change and costs may increase materially. As discussed in Note 7, the State of New York issued a Feasibility Study and Proposed Amended Record of Decision, proposing to impose additional remedial requirements. The company, along with other interested parties, has submitted comments on that proposal. The State of New York has said that, among other things, it is also evaluating potential natural resource damages. In addition, we are a party to various, and expect to become a party to additional, legal proceedings and disputes related to remediation, costs, allowability and/or alleged environmental impacts in Bethpage, including with federal and state entities, the Navy, local municipalities and water districts, and insurance carriers, as well as class action and individual plaintiffs alleging personal injury and property damage and seeking both monetary and non-monetary relief. These Bethpage matters could result in additional costs, fines, penalties, sanctions, compensatory or other damages (including natural resource damages), determinations on allocation, allowability and coverage, and non-monetary relief. We cannot at this time predict or reasonably estimate the potential cumulative outcomes or ranges of possible liability of these aggregate Bethpage matters. On August 12, 2016, a putative class action complaint, naming Orbital ATK and two of its then-officers as defendants, Steven Knurr, et al. v. Orbital ATK, Inc., No. 16-cv-01031 (TSE-MSN), was filed in the United States District Court for the Eastern District of Virginia. The complaint asserts claims on behalf of purchasers of Orbital ATK securities for violations of Sections 10(b) and 20(a) of the Exchange Act and Rule 10b-5, allegedly arising out of false and misleading statements and the failure to disclose that: (i) Orbital ATK lacked effective control over financial reporting; and (ii) as a result, it failed to record an anticipated loss on a long-term contract with the U.S. Army to manufacture and supply small caliber ammunition at the U.S. Army’s Lake City Army Ammunition Plant. On April 24, 2017 and October 10, 2017, the plaintiffs filed amended complaints naming additional defendants and asserting claims for alleged violations of additional sections of the Exchange Act and alleged false and misleading statements in Orbital ATK’s Form S-4 filed in connection with the Orbital-ATK Merger. The complaint seeks damages, reasonable costs and expenses at trial, including counsel and expert fees, and such other relief as deemed appropriate by the Court. On June 7, 2019, the court approved the parties’ proposal to resolve the litigation for $108 million , subject to certain terms and conditions. The company continues to negotiate with and pursue coverage litigation against various of its insurance carriers. The company is a party to various other investigations, lawsuits, arbitration, claims, enforcement actions and other legal proceedings, including government investigations and claims, that arise in the ordinary course of our business. The nature of legal proceedings is such that we cannot assure the outcome of any particular matter. However, based on information available to the company to date, the company does not believe that the outcome of any of these other matters pending against the company is likely to have a material adverse effect on the company’s unaudited condensed consolidated financial position as of September 30, 2019

Commitments and Contingencies (

Commitments and Contingencies (Unaudited)	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES U.S. Government Cost Claims From time to time, the company is advised of claims by the U.S. government concerning certain potential disallowed costs, plus, at times, penalties and interest. When such findings are presented, the company and U.S. government representatives engage in discussions to enable the company to evaluate the merits of these claims, as well as to assess the amounts being claimed. Where appropriate, provisions are made to reflect the company’s estimated exposure for such potential disallowed costs. Such provisions are reviewed periodically using the most recent information available. The company believes it has adequately reserved for disputed amounts that are probable and reasonably estimable, and that the outcome of any such matters would not have a material adverse effect on its unaudited condensed consolidated financial position as of September 30, 2019 , or its annual results of operations and/or cash flows. Environmental Matters The table below summarizes management’s estimate of the range of reasonably possible future costs for environmental remediation, the amount accrued within that range, and the deferred costs expected to be recoverable through overhead charges on U.S. government contracts as of September 30, 2019 and December 31, 2018 : $ in millions Range of Reasonably Possible Future Costs (1) Accrued Costs (2) Deferred Costs (3) September 30, 2019 $528 - $997 $ 543 $ 423 December 31, 2018 447 - 835 461 343 (1) Estimated remediation costs are not discounted to present value. The range of reasonably possible future costs does not take into consideration amounts expected to be recoverable through overhead charges on U.S. government contracts. (2) As of September 30, 2019 , $163 million is recorded in Other current liabilities and $380 million is recorded in Other non-current liabilities. (3) As of September 30, 2019 , $128 million is deferred in Prepaid expenses and other current assets and $295 million is deferred in Other non-current assets. Although management cannot predict whether new information gained as our environmental remediation projects progress, or as changes in facts and circumstances occur, will materially affect the estimated liability accrued, except with respect to Bethpage, we do not anticipate that future remediation expenditures associated with our currently identified projects will have a material adverse effect on the company’s unaudited condensed consolidated financial position as of September 30, 2019 , or its annual results of operations and/or cash flows. With respect to Bethpage, the State of New York issued a Feasibility Study and Proposed Amended Record of Decision, proposing to impose additional remedial requirements. The company, along with other interested parties, has submitted comments on that proposal. The comments address, among other things, the adequacy of the existing remedy, concerns with the state’s proposal, and an alternative approach. As discussed in Note 6, the remediation standards or requirements to which we are subject are being reconsidered and may change and costs may increase materially. Financial Arrangements In the ordinary course of business, the company uses standby letters of credit and guarantees issued by commercial banks and surety bonds issued principally by insurance companies to guarantee the performance on certain obligations. At September 30, 2019 , there were $452 million of stand-by letters of credit and guarantees and $209 million of surety bonds outstanding. Commercial Paper The company maintains a commercial paper program that serves as a source of short-term financing with capacity to issue unsecured commercial paper notes up to $2.0 billion . At September 30, 2019 , there were $399 million of outstanding short-term commercial paper borrowings at a weighted-average interest rate of 2.31 percent that have original maturities of three months or less from the date of issuance. The outstanding balance of commercial paper borrowings is recorded in Other current liabilities in the unaudited condensed consolidated statements of financial position. Credit Facilities The company maintains a five-year senior unsecured credit facility in an aggregate principal amount of $2.0 billion (the “2018 Credit Agreement”) that matures in August 2023. At September 30, 2019 , there was no balance outstanding under this facility; however, the outstanding balance of commercial paper borrowings reduces the amount available for borrowing under the 2018 Credit Agreement. In October 2019, the company amended the 2018 Credit Agreement to extend its maturity date by one year from August 2023 to August 2024. In December 2016, a subsidiary of the company entered into a two-year credit facility, with two additional one-year option periods, in an aggregate principal amount of £120 million (the equivalent of approximately $148 million as of September 30, 2019 ) (the “2016 Credit Agreement”). The company exercised the second option to extend the maturity to December 2020. The 2016 Credit Agreement is guaranteed by the company. At September 30, 2019 , there was £60 million (the equivalent of approximately $74 million ) outstanding under this facility, which bears interest at a rate of LIBOR plus 1.10 percent . All of the borrowings outstanding under this facility mature less than one year from the date of issuance, but may be renewed under the terms of the facility. Based on our intent and ability to refinance the obligations on a long-term basis, a large majority of the borrowings are classified as non-current. At September 30, 2019 , the company was in compliance with all covenants under its credit agreements.

Retirement Benefits (Unaudited)

Retirement Benefits (Unaudited)	9 Months Ended
	Sep. 30, 2019
Retirement Benefits [Abstract]
RETIREMENT BENEFITS	RETIREMENT BENEFITS The cost (benefit) to the company of its retirement plans is shown in the following table: Three Months Ended September 30 Nine Months Ended September 30 Pension OPB Pension OPB $ in millions 2019 2018 2019 2018 2019 2018 2019 2018 Components of net periodic benefit cost (benefit) Service cost $ 92 $ 102 $ 4 $ 5 $ 276 $ 301 $ 12 $ 15 Interest cost 340 316 20 20 1,020 906 60 58 Expected return on plan assets (525 ) (571 ) (23 ) (26 ) (1,576 ) (1,644 ) (69 ) (75 ) Amortization of prior service credit (15 ) (15 ) (1 ) (5 ) (44 ) (44 ) (2 ) (16 ) Net periodic benefit cost (benefit) $ (108 ) $ (168 ) $ — $ (6 ) $ (324 ) $ (481 ) $ 1 $ (18 ) Employer Contributions The company sponsors defined benefit pension and OPB plans, as well as defined contribution plans. We fund our defined benefit pension plans annually in a manner consistent with the Employee Retirement Income Security Act of 1974, as amended by the Pension Protection Act of 2006. Contributions made by the company to its retirement plans are as follows: Three Months Ended September 30 Nine Months Ended September 30 $ in millions 2019 2018 2019 2018 Defined benefit pension plans $ 18 $ 273 $ 64 $ 318 OPB plans 10 10 34 32 Defined contribution plans 98 104 377 296

Stock Compensation Plans and Ot

Stock Compensation Plans and Other Compensation Arrangements (Unaudited)	9 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement [Abstract]
STOCK COMPENSATION PLANS AND OTHER COMPENSATION ARRANGEMENTS	STOCK COMPENSATION PLANS AND OTHER COMPENSATION ARRANGEMENTS Stock Awards The following table presents the number of restricted stock rights (RSRs) and restricted performance stock rights (RPSRs) granted to employees under the company’s long-term incentive stock plan and the grant date aggregate fair value of those stock awards for the periods presented: Nine Months Ended September 30 in millions 2019 2018 RSRs granted 0.1 0.1 RPSRs granted 0.2 0.2 Grant date aggregate fair value $ 92 $ 119 RSRs typically vest on the third anniversary of the grant date, while RPSRs generally vest and pay out based on the achievement of financial metrics over a three -year period. Cash Awards The following table presents the minimum and maximum aggregate payout amounts related to cash units (CUs) and cash performance units (CPUs) granted to employees in the periods presented: Nine Months Ended September 30 $ in millions 2019 2018 Minimum aggregate payout amount $ 36 $ 36 Maximum aggregate payout amount 203 205 CUs typically vest and settle in cash on the third anniversary of the grant date, while CPUs generally vest and pay out in cash based on the achievement of financial metrics over a three -year period.

Leases (Unaudited) (Notes)

Leases (Unaudited) (Notes)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Lessee, Operating and Finance Leases [Text Block]	LEASES As described in Note 1 , effective January 1, 2019, we adopted ASC 842 using the optional transition method. In accordance with the optional transition method, we did not recast the prior period unaudited condensed consolidated financial statements and all prior period amounts and disclosures are presented under ASC 840. Finance leases are not material to our unaudited condensed consolidated financial statements and are therefore not included in the following disclosures. Total Lease Cost Total lease cost is included in Product and Service costs and G&A expenses in the unaudited condensed consolidated statement of earnings and comprehensive income and is recorded net of immaterial sublease income. Total lease cost is comprised of the following: $ in millions Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Operating lease cost $ 78 $ 237 Variable lease cost 3 7 Short-term lease cost 25 54 Total lease cost $ 106 $ 298 Supplemental Balance Sheet Information Supplemental operating lease balance sheet information consists of the following: $ in millions September 30, 2019 Operating lease right-of-use assets $ 1,511 Other current liabilities 260 Operating lease liabilities 1,304 Total operating lease liabilities $ 1,564 Other Supplemental Information Other supplemental operating lease information consists of the following: $ in millions Nine Months Ended September 30, 2019 Cash paid for amounts included in the measurement of operating lease liabilities $ 223 Right-of-use assets obtained in exchange for new lease liabilities 397 Weighted average remaining lease term 11.7 years Weighted average discount rate 3.8 % Maturities of Lease Liabilities Maturities of operating lease liabilities as of September 30, 2019 are as follows: $ in millions Year Ending December 31 2019 (1) $ 74 2020 298 2021 249 2022 212 2023 175 Thereafter 986 Total lease payments 1,994 Less: imputed interest (430 ) Present value of operating lease liabilities $ 1,564 (1) Excludes the nine months ended September 30, 2019 . As of September 30, 2019 , we have approximately $100 million in rental commitments for real estate leases that have not yet commenced. These leases are expected to commence in 2020 and 2021 with lease terms of 2 to 12 years . Rental expense for operating leases classified under ASC 840 for the three and nine months ended September 30, 2018 was $97 million and $270 million , respectively. These amounts are net of immaterial amounts of sublease income. As of December 31, 2018 , future minimum lease payments under long-term non-cancelable operating leases as classified under ASC 840 were as follows: $ in millions Year Ending December 31 2019 $ 312 2020 270 2021 221 2022 186 2023 152 Thereafter 939 Total minimum lease payments $ 2,080

Segment Information (Unaudited)

Segment Information (Unaudited)	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION The company is aligned in four operating sectors, which also comprise our reportable segments: Aerospace Systems, Innovation Systems, Mission Systems and Technology Services. The following table presents sales and operating income by segment: Three Months Ended September 30 Nine Months Ended September 30 $ in millions 2019 2018 2019 2018 Sales Aerospace Systems $ 3,458 $ 3,282 $ 10,344 $ 9,899 Innovation Systems 1,584 1,415 4,520 1,815 Mission Systems 3,029 2,911 9,043 8,668 Technology Services 1,067 1,040 3,088 3,232 Intersegment eliminations (663 ) (563 ) (1,875 ) (1,675 ) Total sales 8,475 8,085 25,120 21,939 Operating income Aerospace Systems 324 376 1,067 1,074 Innovation Systems 164 161 500 200 Mission Systems 398 399 1,189 1,122 Technology Services 136 111 351 328 Intersegment eliminations (82 ) (68 ) (222 ) (204 ) Total segment operating income 940 979 2,885 2,520 Net FAS (service)/CAS pension adjustment 131 176 346 440 Unallocated corporate (expense) income (120 ) 17 (398 ) (123 ) Total operating income $ 951 $ 1,172 $ 2,833 $ 2,837 Net FAS (Service)/CAS Pension Adjustment For financial statement purposes, we account for our employee pension plans in accordance with FAS. However, the cost of these plans is charged to our contracts in accordance with the Federal Acquisition Regulation (FAR) and the related U.S. Government Cost Accounting Standards (CAS). The net FAS (service)/CAS pension adjustment reflects the difference between CAS pension expense included as cost in segment operating income and the service cost component of FAS expense included in total operating income. Unallocated Corporate (Expense) Income Unallocated corporate expense includes the portion of corporate costs not considered allowable or allocable under applicable CAS or FAR, and therefore not allocated to the segments, such as a portion of management and administration, legal, environmental, compensation, retiree benefits and other corporate unallowable costs. Unallocated corporate expense also includes costs not considered part of management’s evaluation of segment operating performance, such as amortization of purchased intangible assets and the additional depreciation expense related to the step-up in fair value of property, plant and equipment acquired through business combinations. Disaggregation of Revenue Sales by Customer Type Three Months Ended September 30 Nine Months Ended September 30 2019 2018 2019 2018 $ in millions $ % (3) $ % (3) $ % (3) $ % (3) Aerospace Systems U.S. government (1) $ 3,014 87 % $ 2,926 89 % $ 8,954 87 % $ 8,633 87 % International (2) 353 10 % 270 8 % 1,137 11 % 990 10 % Other customers 36 1 % 44 2 % 100 1 % 124 1 % Intersegment sales 55 2 % 42 1 % 153 1 % 152 2 % Aerospace Systems sales 3,458 100 % 3,282 100 % 10,344 100 % 9,899 100 % Innovation Systems U.S. government (1) 1,163 74 % 972 69 % 3,239 72 % 1,237 68 % International (2) 228 14 % 272 19 % 702 16 % 364 20 % Other customers 99 6 % 134 9 % 331 7 % 164 9 % Intersegment sales 94 6 % 37 3 % 248 5 % 50 3 % Innovation Systems sales 1,584 100 % 1,415 100 % 4,520 100 % 1,815 100 % Mission Systems U.S. government (1) 2,260 75 % 2,232 77 % 6,775 75 % 6,577 76 % International (2) 416 14 % 374 12 % 1,242 14 % 1,144 13 % Other customers 32 1 % 25 1 % 105 1 % 89 1 % Intersegment sales 321 10 % 280 10 % 921 10 % 858 10 % Mission Systems sales 3,029 100 % 2,911 100 % 9,043 100 % 8,668 100 % Technology Services U.S. government (1) 629 59 % 581 56 % 1,799 58 % 1,780 55 % International (2) 208 19 % 183 17 % 642 21 % 596 18 % Other customers 37 4 % 72 7 % 94 3 % 241 8 % Intersegment sales 193 18 % 204 20 % 553 18 % 615 19 % Technology Services sales 1,067 100 % 1,040 100 % 3,088 100 % 3,232 100 % Total U.S. government (1) 7,066 83 % 6,711 83 % 20,767 83 % 18,227 83 % International (2) 1,205 14 % 1,099 14 % 3,723 15 % 3,094 14 % Other customers 204 3 % 275 3 % 630 2 % 618 3 % Total Sales $ 8,475 100 % $ 8,085 100 % $ 25,120 100 % $ 21,939 100 % (1) Sales to the U.S. government include sales from contracts for which we are the prime contractor, as well as those for which we are a subcontractor and the ultimate customer is the U.S. government. Each of the company’s segments derives substantial revenue from the U.S. government. (2) International sales include sales from contracts for which we are the prime contractor, as well as those for which we are a subcontractor and the ultimate customer is an international customer. These sales include foreign military sales contracted through the U.S. government. (3) Percentages calculated based on total segment sales. Sales by Contract Type Three Months Ended September 30 Nine Months Ended September 30 2019 2018 2019 2018 $ in millions $ % (1) $ % (1) $ % (1) $ % (1) Aerospace Systems Cost-type $ 1,995 59 % $ 1,953 60 % $ 5,976 59 % $ 5,789 59 % Fixed-price 1,408 41 % 1,287 40 % 4,215 41 % 3,958 41 % Intersegment sales 55 42 153 152 Aerospace Systems sales 3,458 3,282 10,344 9,899 Innovation Systems Cost-type 419 28 % 373 27 % 1,232 29 % 472 27 % Fixed-price 1,071 72 % 1,005 73 % 3,040 71 % 1,293 73 % Intersegment sales 94 37 248 50 Innovation Systems sales 1,584 1,415 4,520 1,815 Mission Systems Cost-type 1,264 47 % 1,259 48 % 3,854 47 % 3,745 48 % Fixed-price 1,444 53 % 1,372 52 % 4,268 53 % 4,065 52 % Intersegment sales 321 280 921 858 Mission Systems sales 3,029 2,911 9,043 8,668 Technology Services Cost-type 398 46 % 373 45 % 1,202 47 % 1,195 46 % Fixed-price 476 54 % 463 55 % 1,333 53 % 1,422 54 % Intersegment sales 193 204 553 615 Technology Services sales 1,067 1,040 3,088 3,232 Total Cost-type 4,076 48 % 3,958 49 % 12,264 49 % 11,201 51 % Fixed-price 4,399 52 % 4,127 51 % 12,856 51 % 10,738 49 % Total Sales $ 8,475 $ 8,085 $ 25,120 $ 21,939 (1) Percentages calculated based on external customer sales. Sales by Geographic Region Three Months Ended September 30 Nine Months Ended September 30 2019 2018 2019 2018 $ in millions $ % (2) $ % (2) $ % (2) $ % (2) Aerospace Systems United States $ 3,050 90 % $ 2,970 92 % $ 9,054 89 % $ 8,757 90 % Asia/Pacific 173 5 % 121 4 % 632 6 % 499 5 % All other (1) 180 5 % 149 4 % 505 5 % 491 5 % Intersegment sales 55 42 153 152 Aerospace Systems sales 3,458 3,282 10,344 9,899 Innovation Systems United States 1,262 85 % 1,105 80 % 3,570 84 % 1,401 79 % Asia/Pacific 30 2 % 72 5 % 123 3 % 96 6 % All other (1) 198 13 % 201 15 % 579 13 % 268 15 % Intersegment sales 94 37 248 50 Innovation Systems sales 1,584 1,415 4,520 1,815 Mission Systems United States 2,292 85 % 2,253 86 % 6,880 85 % 6,666 85 % Asia/Pacific 143 5 % 208 8 % 443 5 % 521 7 % All other (1) 273 10 % 170 6 % 799 10 % 623 8 % Intersegment sales 321 280 921 858 Mission Systems sales 3,029 2,911 9,043 8,668 Technology Services United States 666 76 % 653 78 % 1,893 75 % 2,021 77 % Asia/Pacific 44 5 % 45 5 % 144 6 % 113 4 % All other (1) 164 19 % 138 17 % 498 19 % 483 19 % Intersegment sales 193 204 553 615 Technology Services sales 1,067 1,040 3,088 3,232 Total United States 7,270 86 % 6,981 86 % 21,397 85 % 18,845 86 % Asia/Pacific 390 5 % 446 6 % 1,342 5 % 1,229 6 % All other (1) 815 9 % 658 8 % 2,381 10 % 1,865 8 % Total Sales $ 8,475 $ 8,085 $ 25,120 $ 21,939 (1) All other is principally comprised of Europe and the Middle East. (2) Percentages calculated based on external customer sales.

Summary of Significant Accounti

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles of Consolidation	These unaudited condensed consolidated financial statements (the “financial statements”) include the accounts of Northrop Grumman Corporation and its subsidiaries and joint ventures or other investments for which we consolidate the financial results (herein referred to as “Northrop Grumman,” the “company,” “we,” “us,” or “our”). Material intercompany accounts, transactions and profits are eliminated in consolidation. Investments in equity securities and joint ventures where the company has significant influence, but not control, are accounted for using the equity method.
Basis of Presentation	These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP” or “FAS”) and in accordance with the rules of the Securities and Exchange Commission (SEC) for interim reporting. The financial statements include adjustments of a normal recurring nature considered necessary by management for a fair presentation of the company’s unaudited condensed consolidated financial position, results of operations and cash flows. The results reported in these financial statements are not necessarily indicative of results that may be expected for the entire year. These financial statements should be read in conjunction with the information contained in the company’s 2018 Annual Report on Form 10-K.
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 the company’s long-standing practice to establish actual interim closing dates using a “fiscal” calendar, in which we close our books on a Friday near these quarter-end dates in order to normalize the potentially disruptive effects of quarterly closings on business processes. This practice is only used at interim periods within a reporting year.
Accounting Estimates	Preparation of the 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 sales and expenses during the reporting period. Estimates have been prepared using the most current and best available information; however, actual results could differ materially from those estimates.
Revenue from Contract with Customer	Use of the cost-to-cost method requires us to make reasonably dependable estimates regarding the revenue and cost associated with the design, manufacture and delivery of our products and services. The company estimates profit on these contracts as the difference between total estimated sales and total estimated cost at completion and recognizes that profit as costs are incurred. Significant judgment is used to estimate total sales and cost at completion. Contract sales may include estimates of variable consideration, including cost or performance incentives (such as award and incentive fees), contract claims and requests for equitable adjustment (REAs). Variable consideration is included in total estimated sales to the extent it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. We estimate variable consideration as the most likely amount to which we expect to be entitled. We recognize changes in estimated contract sales or costs and the resulting changes in contract profit on a cumulative basis. Cumulative EAC adjustments represent the cumulative effect of the changes on current and prior periods; sales and operating margins in future periods are recognized as if the revised estimates had been used since contract inception. If it is determined that a loss is expected to result on an individual performance obligation, the entire amount of the estimable future loss, including an allocation of general and administrative (G&A) costs, is charged against income in the period the loss is identified. Each loss provision is first offset against costs included in Unbilled receivables or Inventoried costs; remaining amounts are reflected in Other current liabilities. Contract Assets and Liabilities For each of the company’s contracts, the timing of revenue recognition, customer billings, and cash collections results in a net contract asset or liability at the end of each reporting period. Fixed-price contracts are typically billed to the customer either using 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 assets are equivalent to and reflected as Unbilled receivables in the unaudited condensed consolidated statements of financial position and are primarily related to long-term contracts where revenue recognized under the cost-to-cost method exceeds amounts billed to customers. Unbilled receivables 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-cycle nature of many of our contracts. Accumulated contract costs in unbilled receivables include costs such as direct production costs, factory and engineering overhead, production tooling costs, and allowable G&A. Unbilled receivables also include certain estimates of variable consideration described above. These contract assets are not considered a significant financing component of the company’s contracts as the payment terms are intended to protect the customer in the event the company does not perform on its obligations under the contract. Contract liabilities are equivalent to and reflected as Advance payments and billings in excess of costs incurred in the unaudited condensed consolidated statements of financial position. Certain customers make advance payments prior to the company’s satisfaction of its obligations on the contract. These amounts are recorded as contract liabilities until such obligations are satisfied, either over time as costs are incurred or at a point in time when deliveries are made. Contract liabilities are not a significant financing component as they are generally utilized to pay for contract costs within a one-year period or are used to ensure the customer meets contractual requirements. The majority of our sales are derived from long-term contracts with the U.S. government for the production of goods, the provision of services, or a combination of both. The company classifies sales as product or service based on the predominant attributes of each performance obligation. The company recognizes revenue for each separately identifiable performance obligation in a contract representing a promise to transfer a distinct good or service to a customer. In most cases, goods and services provided under the company’s contracts are accounted for as single performance obligations due to the complex and integrated nature of our products and services. These contracts generally require significant integration of a group of goods and/or services to deliver a combined output. In some contracts, the company provides multiple distinct goods or services to a customer, most commonly when a contract covers multiple phases of the product lifecycle (e.g., development, production, sustainment, etc.). In those cases, the company accounts for the distinct contract deliverables as separate performance obligations and allocates the transaction price to each performance obligation based on its relative standalone selling price, which is generally estimated using a cost plus a reasonable margin approach. Warranties are provided on certain contracts, but do not typically provide for services beyond standard assurances and are therefore not considered to be separate performance obligations. Assets recognized from the costs to obtain or fulfill a contract are not material. Contracts are often modified for changes in contract specifications or requirements, which may result in scope and/or price changes. Most of the company’s contract modifications are for goods or services that are not distinct in the context of the contract and are therefore accounted for as part of the original performance obligation through a cumulative estimate-at-completion (EAC) adjustment. The company recognizes revenue as control is transferred to the customer, either over time or at a point in time. In general, our U.S. government contracts contain termination for convenience and/or other clauses that generally provide the customer rights to goods produced and/or in-process. Similarly, our non-U.S. government contracts generally contain contractual termination clauses or entitle the company to payment for work performed to date for goods and services that do not have an alternative use. As control is effectively transferred while we perform on our contracts, we generally recognize revenue over time using the cost-to-cost method (cost incurred relative to total cost estimated at completion) as the company believes this represents the most appropriate measurement towards satisfaction of its performance obligations. Revenue for contracts in which the control of goods produced does not transfer until delivery to the customer is recognized at a point in time (i.e., typically upon delivery).
Leases	The company leases certain buildings, land and equipment. Under ASC 842, at contract inception we determine whether the contract is or contains a lease and whether the lease should be classified as an operating or a finance lease. Operating leases are included in Operating lease right-of-use assets, Other current liabilities, and Operating lease liabilities in our unaudited condensed consolidated statements of financial position. The company recognizes operating lease right-of-use assets and operating lease liabilities based on the present value of the future minimum lease payments over the lease term at commencement date. We use our incremental borrowing rate based on the information available at commencement date to determine the present value of future payments and the appropriate lease classification. Many of our leases include renewal options aligned with our contract terms. We define the initial lease term to include renewal options determined to be reasonably certain. In our adoption of ASC 842, we elected not to recognize a right-of-use asset and a lease liability for leases with an initial term of 12 months or less; we recognize lease expense for these leases on a straight-line basis over the lease term. We elected the practical expedient to not separate lease components from nonlease components and applied that practical expedient to all material classes of leased assets. Many of the company’s real property lease agreements contain incentives for tenant improvements, rent holidays or rent escalation clauses. For tenant improvement incentives, if the incentive is determined to be a leasehold improvement owned by the lessee, the company generally records a deferred rent liability and amortizes the deferred rent over the term of the lease as a reduction to rent expense. For rent holidays and rent escalation clauses during the lease term, the company records rental expense on a straight-line basis over the term of the lease. For these lease incentives, the company uses the date of initial possession as the commencement date, which is generally when the company is given the right of access to the space and begins to make improvements in preparation for intended use.
Pension and Other Postretirement Plans	We fund our defined benefit pension plans annually in a manner consistent with the Employee Retirement Income Security Act of 1974, as amended by the Pension Protection Act of 2006
Earnings Per Share	We calculate basic earnings per share by dividing net earnings by the weighted-average number of shares of common stock outstanding during each period.
Investments in Marketable Securities	The company holds a portfolio of marketable securities consisting of securities to partially fund non-qualified employee benefit plans. A portion of these securities are held in common/collective trust funds and are measured at fair value using net asset value (NAV) per share as a practical expedient; and therefore are not required to be categorized in the fair value hierarchy table
Derivative Financial Instruments and Hedging Activities	Commodity derivatives are valued based on prices of future exchanges and recently reported transactions in the marketplace. For foreign currency forward contracts, where model-derived valuations are appropriate, the company utilizes the income approach to determine the fair value and uses the applicable London Interbank Offered Rate (LIBOR) swap rates.
Fair Value of Long-term Debt	We calculated the fair value of long-term debt using Level 2 inputs, based on interest rates available for debt with terms and maturities similar to the company’s existing debt arrangements.
U.S. Government Cost Claims	From time to time, the company is advised of claims by the U.S. government concerning certain potential disallowed costs, plus, at times, penalties and interest. When such findings are presented, the company and U.S. government representatives engage in discussions to enable the company to evaluate the merits of these claims, as well as to assess the amounts being claimed. Where appropriate, provisions are made to reflect the company’s estimated exposure for such potential disallowed costs. Such provisions are reviewed periodically using the most recent information available. The company believes it has adequately reserved for disputed amounts that are probable and reasonably estimable, and that the outcome of any such matters would not have a material adverse effect on its unaudited condensed consolidated financial position as of
New Accounting Pronouncements and Changes in Accounting Principles	On February 25, 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) . ASC Topic 842 supersedes existing lease guidance, including ASC 840 - Leases . Among other things, ASU 2016-02 requires recognition of a right-of-use asset and liability for future lease payments for contracts that meet the definition of a lease and requires disclosure of certain information about leasing arrangements. On July 30, 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements , which, among other things, allows companies to elect an optional transition method to apply the new lease standard through a cumulative-effect adjustment in the period of adoption.

Basis of Presentation (Unaudi_2

Basis of Presentation (Unaudited) (Tables)	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Change in Accounting Estimate [Table Text Block]	The following table presents the effect of aggregate net EAC adjustments: Three Months Ended September 30 Nine Months Ended September 30 $ in millions, except per share data 2019 2018 2019 2018 Revenue $ 142 $ 149 $ 462 $ 438 Operating income 125 149 421 408 Net earnings (1) 99 117 333 322 Diluted earnings per share (1) 0.58 0.67 1.96 1.84 (1)
Accumulated Other Comprehensive Loss	The components of accumulated other comprehensive loss are as follows: $ in millions September 30, December 31, Unamortized prior service credit, net of tax expense of $21 for 2019 and $32 for 2018 $ 63 $ 98 Cumulative translation adjustment (148 ) (144 ) Other, net (2 ) (6 ) Total accumulated other comprehensive loss $ (87 ) $ (52 )

Business Acquisition (Unaudit_2

Business Acquisition (Unaudited) Business Acquisition (Unaudited) (Tables)	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	The Merger date fair value of the consideration transferred totaled $7.7 billion in cash, which was comprised of the following: $ in millions, except per share amounts Purchase price Shares of Orbital ATK common stock outstanding as of the Merger date 57,562,152 Cash consideration per share of Orbital ATK common stock $ 134.50 Total purchase price $ 7,742
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following purchase price allocation table presents the company’s final determination of the fair values of assets acquired and liabilities assumed at the Merger date: $ in millions As of June 6, 2018 Cash and cash equivalents $ 85 Accounts receivable 596 Unbilled receivables 1,237 Inventoried costs 220 Other current assets 237 Property, plant and equipment 1,509 Goodwill 6,259 Intangible assets 1,525 Other non-current assets 151 Total assets acquired 11,819 Trade accounts payable (397 ) Accrued employee compensation (158 ) Advance payments and billings in excess of costs incurred (222 ) Below market contracts (1) (151 ) Other current liabilities (412 ) Long-term debt (1,687 ) Pension and OPB plan liabilities (613 ) Deferred tax liabilities (248 ) Other non-current liabilities (189 ) Total liabilities assumed (4,077 ) Total purchase price $ 7,742 (1) Included in Other current liabilities in the unaudited condensed consolidated statements of financial position.
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]	The following table presents a summary of purchased intangible assets and their related estimated useful lives: Fair Value (in millions) Estimated Useful Life in Years Customer contracts $ 1,245 9 Commercial customer relationships 280 13 Total customer-related intangible assets $ 1,525
Business Acquisition, Pro Forma Information [Table Text Block]	The following table presents unaudited pro forma financial information prepared in accordance with Article 11 of Regulation S-X and computed as if Orbital ATK had been included in our results as of January 1, 2017 : $ in millions, except per share amounts Nine Months Ended September 30, 2018 Sales $ 24,163 Net earnings 3,050 Diluted earnings per share 17.41

Earnings Per Share, Share Rep_2

Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited) (Tables)	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Share Repurchases	The table below summarizes the company’s share repurchases to date under the authorizations described above: Shares Repurchased Repurchase Program Amount Total Average (1) Date Completed Nine Months Ended September 30 2019 2018 September 16, 2015 $ 4,000 13.6 $ 248.91 2.3 0.7 December 4, 2018 $ 3,000 — — — — (1) Includes commissions paid.

Income Taxes (Unaudited) (Table

Income Taxes (Unaudited) (Tables)	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Schedule of Income Tax Expense and Effective Income Tax Rates	Three Months Ended September 30 Nine Months Ended September 30 $ in millions 2019 2018 2019 2018 Federal and foreign income tax expense $ 122 $ 120 $ 460 $ 466 Effective income tax rate 11.6 % 8.8 % 14.8 % 14.0 %

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Unaudited) (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair value information of assets and liabilities measured at fair value on a recurring basis	The following table presents the financial assets and liabilities the company records at fair value on a recurring basis identified by the level of inputs used to determine fair value: September 30, 2019 December 31, 2018 $ in millions Level 1 Level 2 Total Level 1 Level 2 Total Financial Assets (Liabilities) Marketable securities $ 351 $ — $ 351 $ 319 $ 1 $ 320 Marketable securities valued using NAV 16 15 Total marketable securities 351 — 367 319 1 335 Derivatives — (5 ) (5 ) — (10 ) (10 )

Commitments and Contingencies_2

Commitments and Contingencies (Unaudited) (Tables)	9 Months Ended
	Sep. 30, 2019
Environmental Remediation Range of Future Costs [Line Items]
Environmental Remediation [Table Text Block]	The table below summarizes management’s estimate of the range of reasonably possible future costs for environmental remediation, the amount accrued within that range, and the deferred costs expected to be recoverable through overhead charges on U.S. government contracts as of September 30, 2019 and December 31, 2018 : $ in millions Range of Reasonably Possible Future Costs (1) Accrued Costs (2) Deferred Costs (3) September 30, 2019 $528 - $997 $ 543 $ 423 December 31, 2018 447 - 835 461 343 (1) Estimated remediation costs are not discounted to present value. The range of reasonably possible future costs does not take into consideration amounts expected to be recoverable through overhead charges on U.S. government contracts. (2) As of September 30, 2019 , $163 million is recorded in Other current liabilities and $380 million is recorded in Other non-current liabilities. (3) As of September 30, 2019 , $128 million is deferred in Prepaid expenses and other current assets and $295 million is deferred in Other non-current assets.

Retirement Benefits (Unaudite_2

Retirement Benefits (Unaudited) (Tables)	9 Months Ended
	Sep. 30, 2019
Retirement Benefits [Abstract]
Components of net periodic benefit cost	The cost (benefit) to the company of its retirement plans is shown in the following table: Three Months Ended September 30 Nine Months Ended September 30 Pension OPB Pension OPB $ in millions 2019 2018 2019 2018 2019 2018 2019 2018 Components of net periodic benefit cost (benefit) Service cost $ 92 $ 102 $ 4 $ 5 $ 276 $ 301 $ 12 $ 15 Interest cost 340 316 20 20 1,020 906 60 58 Expected return on plan assets (525 ) (571 ) (23 ) (26 ) (1,576 ) (1,644 ) (69 ) (75 ) Amortization of prior service credit (15 ) (15 ) (1 ) (5 ) (44 ) (44 ) (2 ) (16 ) Net periodic benefit cost (benefit) $ (108 ) $ (168 ) $ — $ (6 ) $ (324 ) $ (481 ) $ 1 $ (18 )
Employer contributions to retirement plans	Contributions made by the company to its retirement plans are as follows: Three Months Ended September 30 Nine Months Ended September 30 $ in millions 2019 2018 2019 2018 Defined benefit pension plans $ 18 $ 273 $ 64 $ 318 OPB plans 10 10 34 32 Defined contribution plans 98 104 377 296

Stock Compensation Plans and _2

Stock Compensation Plans and Other Compensation Arrangements (Unaudited) (Tables)	9 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement [Abstract]
Nonvested Restricted Stock Shares Activity [Table Text Block]	The following table presents the number of restricted stock rights (RSRs) and restricted performance stock rights (RPSRs) granted to employees under the company’s long-term incentive stock plan and the grant date aggregate fair value of those stock awards for the periods presented: Nine Months Ended September 30 in millions 2019 2018 RSRs granted 0.1 0.1 RPSRs granted 0.2 0.2 Grant date aggregate fair value $ 92 $ 119
Cash Units and Cash Performance Units Aggregate Payout Amount [Table Text Block]	The following table presents the minimum and maximum aggregate payout amounts related to cash units (CUs) and cash performance units (CPUs) granted to employees in the periods presented: Nine Months Ended September 30 $ in millions 2019 2018 Minimum aggregate payout amount $ 36 $ 36 Maximum aggregate payout amount 203 205

Leases (Unaudited) Leases (Tabl

Leases (Unaudited) Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Lease, Cost [Table Text Block]	Total lease cost is comprised of the following: $ in millions Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Operating lease cost $ 78 $ 237 Variable lease cost 3 7 Short-term lease cost 25 54 Total lease cost $ 106 $ 298
Supplemental Balance Sheet Disclosures [Text Block]	Supplemental operating lease balance sheet information consists of the following: $ in millions September 30, 2019 Operating lease right-of-use assets $ 1,511 Other current liabilities 260 Operating lease liabilities 1,304 Total operating lease liabilities $ 1,564
Other Supplemental Lease Information [Table Text Block]	Other supplemental operating lease information consists of the following: $ in millions Nine Months Ended September 30, 2019 Cash paid for amounts included in the measurement of operating lease liabilities $ 223 Right-of-use assets obtained in exchange for new lease liabilities 397 Weighted average remaining lease term 11.7 years Weighted average discount rate 3.8 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Maturities of operating lease liabilities as of September 30, 2019 are as follows: $ in millions Year Ending December 31 2019 (1) $ 74 2020 298 2021 249 2022 212 2023 175 Thereafter 986 Total lease payments 1,994 Less: imputed interest (430 ) Present value of operating lease liabilities $ 1,564 (1) Excludes the nine months ended September 30, 2019 .
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	As of December 31, 2018 , future minimum lease payments under long-term non-cancelable operating leases as classified under ASC 840 were as follows: $ in millions Year Ending December 31 2019 $ 312 2020 270 2021 221 2022 186 2023 152 Thereafter 939 Total minimum lease payments $ 2,080

Segment Information (Unaudite_2

Segment Information (Unaudited) (Tables)	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Sales and operating income by segment	The following table presents sales and operating income by segment: Three Months Ended September 30 Nine Months Ended September 30 $ in millions 2019 2018 2019 2018 Sales Aerospace Systems $ 3,458 $ 3,282 $ 10,344 $ 9,899 Innovation Systems 1,584 1,415 4,520 1,815 Mission Systems 3,029 2,911 9,043 8,668 Technology Services 1,067 1,040 3,088 3,232 Intersegment eliminations (663 ) (563 ) (1,875 ) (1,675 ) Total sales 8,475 8,085 25,120 21,939 Operating income Aerospace Systems 324 376 1,067 1,074 Innovation Systems 164 161 500 200 Mission Systems 398 399 1,189 1,122 Technology Services 136 111 351 328 Intersegment eliminations (82 ) (68 ) (222 ) (204 ) Total segment operating income 940 979 2,885 2,520 Net FAS (service)/CAS pension adjustment 131 176 346 440 Unallocated corporate (expense) income (120 ) 17 (398 ) (123 ) Total operating income $ 951 $ 1,172 $ 2,833 $ 2,837
Revenue by Major Customers by Reporting Segments	Sales by Customer Type Three Months Ended September 30 Nine Months Ended September 30 2019 2018 2019 2018 $ in millions $ % (3) $ % (3) $ % (3) $ % (3) Aerospace Systems U.S. government (1) $ 3,014 87 % $ 2,926 89 % $ 8,954 87 % $ 8,633 87 % International (2) 353 10 % 270 8 % 1,137 11 % 990 10 % Other customers 36 1 % 44 2 % 100 1 % 124 1 % Intersegment sales 55 2 % 42 1 % 153 1 % 152 2 % Aerospace Systems sales 3,458 100 % 3,282 100 % 10,344 100 % 9,899 100 % Innovation Systems U.S. government (1) 1,163 74 % 972 69 % 3,239 72 % 1,237 68 % International (2) 228 14 % 272 19 % 702 16 % 364 20 % Other customers 99 6 % 134 9 % 331 7 % 164 9 % Intersegment sales 94 6 % 37 3 % 248 5 % 50 3 % Innovation Systems sales 1,584 100 % 1,415 100 % 4,520 100 % 1,815 100 % Mission Systems U.S. government (1) 2,260 75 % 2,232 77 % 6,775 75 % 6,577 76 % International (2) 416 14 % 374 12 % 1,242 14 % 1,144 13 % Other customers 32 1 % 25 1 % 105 1 % 89 1 % Intersegment sales 321 10 % 280 10 % 921 10 % 858 10 % Mission Systems sales 3,029 100 % 2,911 100 % 9,043 100 % 8,668 100 % Technology Services U.S. government (1) 629 59 % 581 56 % 1,799 58 % 1,780 55 % International (2) 208 19 % 183 17 % 642 21 % 596 18 % Other customers 37 4 % 72 7 % 94 3 % 241 8 % Intersegment sales 193 18 % 204 20 % 553 18 % 615 19 % Technology Services sales 1,067 100 % 1,040 100 % 3,088 100 % 3,232 100 % Total U.S. government (1) 7,066 83 % 6,711 83 % 20,767 83 % 18,227 83 % International (2) 1,205 14 % 1,099 14 % 3,723 15 % 3,094 14 % Other customers 204 3 % 275 3 % 630 2 % 618 3 % Total Sales $ 8,475 100 % $ 8,085 100 % $ 25,120 100 % $ 21,939 100 % (1) Sales to the U.S. government include sales from contracts for which we are the prime contractor, as well as those for which we are a subcontractor and the ultimate customer is the U.S. government. Each of the company’s segments derives substantial revenue from the U.S. government. (2) International sales include sales from contracts for which we are the prime contractor, as well as those for which we are a subcontractor and the ultimate customer is an international customer. These sales include foreign military sales contracted through the U.S. government. (3) Percentages calculated based on total segment sales.
Revenue from External Customers by Contract Type	Sales by Contract Type Three Months Ended September 30 Nine Months Ended September 30 2019 2018 2019 2018 $ in millions $ % (1) $ % (1) $ % (1) $ % (1) Aerospace Systems Cost-type $ 1,995 59 % $ 1,953 60 % $ 5,976 59 % $ 5,789 59 % Fixed-price 1,408 41 % 1,287 40 % 4,215 41 % 3,958 41 % Intersegment sales 55 42 153 152 Aerospace Systems sales 3,458 3,282 10,344 9,899 Innovation Systems Cost-type 419 28 % 373 27 % 1,232 29 % 472 27 % Fixed-price 1,071 72 % 1,005 73 % 3,040 71 % 1,293 73 % Intersegment sales 94 37 248 50 Innovation Systems sales 1,584 1,415 4,520 1,815 Mission Systems Cost-type 1,264 47 % 1,259 48 % 3,854 47 % 3,745 48 % Fixed-price 1,444 53 % 1,372 52 % 4,268 53 % 4,065 52 % Intersegment sales 321 280 921 858 Mission Systems sales 3,029 2,911 9,043 8,668 Technology Services Cost-type 398 46 % 373 45 % 1,202 47 % 1,195 46 % Fixed-price 476 54 % 463 55 % 1,333 53 % 1,422 54 % Intersegment sales 193 204 553 615 Technology Services sales 1,067 1,040 3,088 3,232 Total Cost-type 4,076 48 % 3,958 49 % 12,264 49 % 11,201 51 % Fixed-price 4,399 52 % 4,127 51 % 12,856 51 % 10,738 49 % Total Sales $ 8,475 $ 8,085 $ 25,120 $ 21,939 (1) Percentages calculated based on external customer sales.
Revenue from External Customers by Geographic Areas	Sales by Geographic Region Three Months Ended September 30 Nine Months Ended September 30 2019 2018 2019 2018 $ in millions $ % (2) $ % (2) $ % (2) $ % (2) Aerospace Systems United States $ 3,050 90 % $ 2,970 92 % $ 9,054 89 % $ 8,757 90 % Asia/Pacific 173 5 % 121 4 % 632 6 % 499 5 % All other (1) 180 5 % 149 4 % 505 5 % 491 5 % Intersegment sales 55 42 153 152 Aerospace Systems sales 3,458 3,282 10,344 9,899 Innovation Systems United States 1,262 85 % 1,105 80 % 3,570 84 % 1,401 79 % Asia/Pacific 30 2 % 72 5 % 123 3 % 96 6 % All other (1) 198 13 % 201 15 % 579 13 % 268 15 % Intersegment sales 94 37 248 50 Innovation Systems sales 1,584 1,415 4,520 1,815 Mission Systems United States 2,292 85 % 2,253 86 % 6,880 85 % 6,666 85 % Asia/Pacific 143 5 % 208 8 % 443 5 % 521 7 % All other (1) 273 10 % 170 6 % 799 10 % 623 8 % Intersegment sales 321 280 921 858 Mission Systems sales 3,029 2,911 9,043 8,668 Technology Services United States 666 76 % 653 78 % 1,893 75 % 2,021 77 % Asia/Pacific 44 5 % 45 5 % 144 6 % 113 4 % All other (1) 164 19 % 138 17 % 498 19 % 483 19 % Intersegment sales 193 204 553 615 Technology Services sales 1,067 1,040 3,088 3,232 Total United States 7,270 86 % 6,981 86 % 21,397 85 % 18,845 86 % Asia/Pacific 390 5 % 446 6 % 1,342 5 % 1,229 6 % All other (1) 815 9 % 658 8 % 2,381 10 % 1,865 8 % Total Sales $ 8,475 $ 8,085 $ 25,120 $ 21,939 (1) All other is principally comprised of Europe and the Middle East. (2) Percentages calculated based on external customer sales.

Basis of Presentation (Unaudi_3

Basis of Presentation (Unaudited) (Details 1) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Change in Accounting Estimate [Line Items]
Operating income	$ 951	$ 1,172	$ 2,833	$ 2,837
Net earnings	$ 933	$ 1,244	$ 2,657	$ 2,873
Earnings Per Share, Diluted	$ 5.49	$ 7.11	$ 15.60	$ 16.40
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 142	$ 149	$ 462	$ 438
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income	125	149	421	408
Net earnings	$ 99	$ 117	$ 333	$ 322
Earnings Per Share, Diluted	$ 0.58	$ 0.67	$ 1.96	$ 1.84

Basis of Presentation (Unaudi_4

Basis of Presentation (Unaudited) (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Change in Contract with Customer, Liability [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 209	$ 168	$ 1,200	$ 1,200
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 65,000		$ 65,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation			We expect to recognize approximately 40 percent and 65 percent of our September 30, 2019 backlog as revenue over the next 12 and 24 months, respectively, with the remainder to be recognized thereafter.

Basis of Presentation (Unaudi_5

Basis of Presentation (Unaudited) (Details 3) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Prior Service Cost (Credit), after Tax	$ 63		$ 63		$ 98
Cumulative translation adjustment	(148)		(148)		(144)
Other, net	(2)		(2)		(6)
Total accumulated other comprehensive loss	(87)		(87)		(52)
Unamortized prior service credit, tax expense	21		21		$ 32
Unamortized prior service credit, reclassified from accumulated other comprehensive loss to net earnings	$ 12	$ 15	$ 35	$ 45

Business Acquisition (Unaudit_3

Business Acquisition (Unaudited) (Details 1) - USD ($) $ / shares in Units, $ in Millions	Jun. 06, 2018	Jun. 06, 2019	Sep. 30, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles		$ 220
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other current liabilities		114
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Pension and other post-retirement benefit plan liabilities		56
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Non-Current Liabilities		53
Business Combination, Provisional, Initial Accounting Incomplete, Adjustments, Other Current Assets		44
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill		$ (36)
Goodwill			$ 18,707	$ 18,672
Shares of Orbital ATK common stock outstanding as of the Merger date	57,562,152
Cash consideration per share of Orbital ATK common stock	$ 134.50
Total purchase price	$ 7,742
Orbital ATK
Business Acquisition [Line Items]
Cash and cash equivalents	85
Accounts receivable	596
Unbilled receivables	1,237
Inventoried costs	220
Other current assets	237
Property, plant and equipment	1,509
Goodwill	6,259
Intangible assets	1,525
Other non-current assets	151
Total assets acquired	11,819
Trade accounts payable	(397)
Accrued employee compensation	(158)
Advance payments and billings in excess of costs incurred	(222)
Below market contracts(1)	(151)
Other current liabilities	(412)
Long-term debt	(1,687)
Pension and OPB plan liabilities	(613)
Deferred tax liabilities	(248)
Other non-current liabilities	(189)
Total liabilities assumed	(4,077)
Total purchase price	$ 7,742

Business Acquisition (Unaudit_4

Business Acquisition (Unaudited) (Details 2) $ in Millions	Jun. 06, 2018USD ($)
Orbital ATK
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 1,525
Customer Contracts [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 1,245
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	9 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 280
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years

Business Acquisition (Unaudit_5

Business Acquisition (Unaudited) (Details 3) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)$ / shares
Business Acquisition [Line Items]
Pro forma sales	$ 24,163
Pro forma net earnings	$ 3,050
Pro forma diluted earnings per share | $ / shares	$ 17.41
Pro Forma Adjustments, Orbital ATK intercompany sales elimination	$ (80)
Pro Forma Adjustments, Elimination of nonrecurring transaction costs	71
Pro Forma Adjustments, Additional depreciation expense, net of removal of historical depreciation	(10)
Pro Forma Adjustments, Additional amortization expense, net of removal of historical amortization expense	(101)
Pro Forma Adjustments, Elimination of Orbital ATK’s amortization on net actuarial losses and prior service costs and pension/post-retirement costs	51
Income Tax Effects of Pro Forma Adjustments	$ (2)

Earnings Per Share, Share Rep_3

Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited) (Details 1) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended		42 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Dec. 04, 2018	Sep. 16, 2015
Share Repurchase [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0.8	0.8	0.7	0.9
September 2015 Share Repurchase Program Original Authorization
Share Repurchase [Line Items]
Amount Authorized							$ 4,000
Shares Retired					13.6
Average Cost Per Share					$ 248.91
Shares Repurchased			2.3	0.7
Share Repurchases - Notes to Table
Shares repurchased amount					$ 3,400
Amount remaining under authorization for share repurchases	$ 600		$ 600		$ 600
December 2018 Share Repurchase Original Authorization [Member]
Share Repurchase [Line Items]
Amount Authorized						$ 3,000
Shares Retired			0
Average Cost Per Share			$ 0

Earnings Per Share, Share Rep_4

Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited) (Details 2) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended				2 Months Ended		3 Months Ended		9 Months Ended
	May 31, 2019	May 31, 2018	Jan. 31, 2018	May 31, 2017	Jan. 04, 2019	Dec. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Oct. 29, 2018
Equity, Class of Treasury Stock [Line Items]
Accelerated Share Repurchase						$ 1,000
Accelerated Share Repurchases, Payment											$ 1,000
Accelerated Share Repurchase Initial Receipt Shares											3
Accelerated Share Repurchase Initial Receipt Monetary											$ 800
Accelerated Share Repurchase Final Receipt Shares					0.9
Accelerated Share Repurchases, Final Price Paid Per Share					$ 260.32
Earnings Per Share, Basic and Diluted [Abstract]
Common stock dividends per share, declared (in dollars per share)	$ 1.32	$ 1.20	$ 1.10	$ 1			$ 1.32	$ 1.20	$ 3.84	$ 3.50
Increase in quarterly common stock dividend (percent)	10.00%	9.00%	10.00%

Income Taxes (Unaudited) (Detai

Income Taxes (Unaudited) (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Federal and foreign income tax expense	$ 122	$ 120	$ 460	$ 466
Effective income tax rate	11.60%	8.80%	14.80%	14.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 89	$ 106	$ 171	$ 156
Effective Income Tax Rate Reconciliation, Tax Deduction, FDII, Amount	17		26
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 84		$ 84

Income Taxes (Unaudited) (Det_2

Income Taxes (Unaudited) (Details 2) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	$ 294	$ 327

Fair Value of Financial Instr_3

Fair Value of Financial Instruments (Unaudited) (Details 1) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	$ 367	$ 335
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	351	319
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	0	1
Fair Value, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	351	320
Derivatives	(5)	(10)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	351	319
Derivatives	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	0	1
Derivatives	(5)	(10)
Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	$ 16	15
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities

Fair Value of Financial Instr_4

Fair Value of Financial Instruments (Unaudited) (Details 2) lb in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)lb	Dec. 31, 2018USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | $	$ 86	$ 114
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net | $	$ 9	$ 0
Copper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	4
Zinc [Member] [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	1

Fair Value of Financial Instr_5

Fair Value of Financial Instruments (Unaudited) Fair Value of Financial Instruments (Unaudited) (Details 3) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018	Jun. 06, 2018
Business Acquisition [Line Items]
Long-term Debt, Fair Value	$ 15,200	$ 14,300
Debt and Lease Obligation	$ 13,900	$ 14,400
Orbital ATK
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			$ 1,687

Investigations, Claims and Li_2

Investigations, Claims and Litigation (Unaudited) (Details) € in Millions, R$ in Millions, $ in Millions

Dec. 28, 2018USD ($)

Dec. 31, 2007USD ($)

Nov. 13, 2018BRL (R$)

Nov. 13, 2018USD ($)

Sep. 30, 2019EUR (€)

Sep. 30, 2019BRL (R$)

Sep. 30, 2019USD ($)

Sep. 30, 2019BRL (R$)Defendant

Sep. 30, 2019USD ($)Defendant

Sep. 30, 2019USD ($)

Dec. 31, 2018USD ($)

Feb. 16, 2018USD ($)

May 04, 2012USD ($)

Loss Contingencies

Unbilled receivables, net

$ 5,777

$ 5,777

$ 5,777

$ 5,026

United States Postal Service

Loss Contingencies

CounterclaimForDamagesSought

$ 193

Solystic Matter [Member]

Loss Contingencies

Loss Contingency, Damages Sought, Value

R$ 111

$ 27

Counterclaim

€ 31

34

Loss Contingency, Damages Awarded, Value

R$ 41

$ 10

Orbital ATK

Loss Contingencies

Loss Contingency, Damages Awarded, Value

$ 108

Unpaid Portions of Contract Price and Direct Costs Incurred [Member] | United States Postal Service

Loss Contingencies

Unbilled receivables, net

$ 63

Acts and Omissions with Adverse Affects on Performance and Obligations [Member] | United States Postal Service

Loss Contingencies

Gain contingency, unrecorded amount

$ 115

United States Postal Service

Loss Contingencies

Contract award

$ 875

United States Postal Service | False Claims Act | Threatened Litigation

Loss Contingencies

Loss Contingency, Damages Sought, Value

179

Solystic Matter [Member] | Solystic Matter [Member]

Loss Contingencies

Loss Contingency, Number of Additional Defendants | Defendant

2

2

Initial Claim [Member] | Solystic Matter [Member]

Loss Contingencies

Loss Contingency, Damages Sought, Value

R$ 89

$ 21

Incremental claim [Member] | Solystic Matter [Member]

Loss Contingencies

Loss Contingency, Damages Sought, Value

R$ 22

5

Maximum | United States Postal Service

Loss Contingencies

Loss Contingency, Estimate of Possible Loss

$ 410

$ 410

$ 410

Commitments and Contingencies_3

Commitments and Contingencies (Unaudited) (Details) £ in Millions	9 Months Ended
	Sep. 30, 2019GBP (£)Rate	Sep. 30, 2019USD ($)Rate	Dec. 31, 2018USD ($)
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs		$ 543,000,000	$ 461,000,000
Recorded Third-Party Environmental Recoveries, Amount		423,000,000	343,000,000
Financial Arrangements
Standby Unused Letters Of Credit and bank guarantees		452,000,000
Surety Bond Outstanding		209,000,000
Line of Credit Facility [Line Items]
Debt Instrument, Covenant Compliance	the company was in compliance with all covenants under its credit agreements.
Commercial Paper		399,000,000
Commercial Paper, Maximum Borrowing Capacity		$ 2,000,000,000
Commercial Paper, Weighted Average Interest Rate | Rate	2.31%	2.31%
Commercial Paper, Term	3 months
Two Year Term [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	£ 120	$ 148,000,000
Line of Credit Outstanding	£ 60	74,000,000
Five Year Term [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		2,000,000,000
Line of Credit Outstanding		0
London Interbank Offered Rate (LIBOR) [Member] | Two Year Term [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate During Period | Rate	1.10%
Other Current Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs		163,000,000
Other Noncurrent Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs		380,000,000
Other Current Assets [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount		128,000,000
Other Noncurrent Assets [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount		295,000,000
Environmental Issue [Member] | Maximum [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss		997,000,000	835,000,000
Environmental Issue [Member] | Minimum
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss		$ 528,000,000	$ 447,000,000

Retirement Benefits (Unaudite_3

Retirement Benefits (Unaudited) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Contribution Plan [Abstract]
Defined contribution plan, employer contributions	$ 98	$ 104	$ 377	$ 296
Pension Benefits
Components of Net Periodic Benefit Cost
Service cost	92	102	276	301
Interest cost	340	316	1,020	906
Expected return on plan assets	(525)	(571)	(1,576)	(1,644)
Amortization of prior service credit	(15)	(15)	(44)	(44)
Net periodic benefit cost (benefit)	(108)	(168)	(324)	(481)
Defined benefit plan, contributions by Employer	18	273	64	318
OPB
Components of Net Periodic Benefit Cost
Service cost	4	5	12	15
Interest cost	20	20	60	58
Expected return on plan assets	(23)	(26)	(69)	(75)
Amortization of prior service credit	(1)	(5)	(2)	(16)
Net periodic benefit cost (benefit)	0	(6)	1	(18)
Defined benefit plan, contributions by Employer	$ 10	$ 10	$ 34	$ 32

Stock Compensation Plans and _3

Stock Compensation Plans and Other Compensation Arrangements (Unaudited) (Details) - USD ($) shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Rights and Restricted Performance Stock Rights Grant Date Aggregate Fair Value	$ 92	$ 119
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0.1	0.1
Vesting period	3 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0.2	0.2
Vesting period	3 years
Cash Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Cash Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Cash Units and Cash Performance Units | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	$ 36	$ 36
Cash Units and Cash Performance Units | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	$ 203	$ 205

Leases (Unaudited) Total Lease

Leases (Unaudited) Total Lease Cost (Details 1) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating Lease Cost	$ 78	$ 237
Variable Lease Cost	3	7
Short-term Lease Cost	25	54
Total Lease Cost	$ 106	$ 298

Leases (Unaudited) Lease Balanc

Leases (Unaudited) Lease Balance Sheet (Details 2) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use assets	$ 1,511	$ 0
Operating Lease, Liability, Current	260
Operating lease liabilities	1,304	$ 0
Operating Lease, Liability	$ 1,564

Leases (Unaudited) Lease Other

Leases (Unaudited) Lease Other Supplemental Information (Details 3) $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)Rate
Leases Other Supplemental Information [Abstract]
Payments on operating leases	$ 223
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 397
Weighted-average remaining lease term—operating leases (in years)	11 years 8 months 12 days
Weighted-average discount rate—operating leases | Rate	3.80%

Leases (Unaudited) Lease Maturi

Leases (Unaudited) Lease Maturities (Details 4) $ in Millions	Sep. 30, 2019USD ($)
Lessee, Lease, Description [Line Items]
Remainder of 2019	$ 74
2020	298
2021	249
2022	212
2023	175
Thereafter	986
Total lease payments	1,994
Less: Imputed Interest	(430)
Present value of operating lease liabilities	1,564
Lessee, Operating Lease, Lease Not yet Commenced, Value	$ 100
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	2 years
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	12 years

Leases (Unaudited) Future Minim

Leases (Unaudited) Future Minimum Lease Payments Under 840 (Details 5) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2018
Future Minimum Lease Payments Under 840 [Abstract]
Operating Leases, Rent Expense	$ 97	$ 270
Operating Leases, Future Minimum Payments Due, Next Twelve Months			$ 312
Operating Leases, Future Minimum Payments, Due in Two Years			270
Operating Leases, Future Minimum Payments, Due in Three Years			221
Operating Leases, Future Minimum Payments, Due in Four Years			186
Operating Leases, Future Minimum Payments, Due in Five Years			152
Operating Leases, Future Minimum Payments, Due Thereafter			939
Operating Leases, Future Minimum Payments Due			$ 2,080

Segment Information (Unaudite_3

Segment Information (Unaudited) (Details 1) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)segment	Sep. 30, 2018USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Sales	$ 8,475	$ 8,085	$ 25,120	$ 21,939
Operating income	951	1,172	2,833	2,837
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	940	979	2,885	2,520
Operating Segments [Member] | Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Sales	3,458	3,282	10,344	9,899
Operating income	324	376	1,067	1,074
Operating Segments [Member] | Innovation Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,584	1,415	4,520	1,815
Operating income	164	161	500	200
Operating Segments [Member] | Mission Systems [Member]
Segment Reporting Information [Line Items]
Sales	3,029	2,911	9,043	8,668
Operating income	398	399	1,189	1,122
Operating Segments [Member] | Technology Services [Member]
Segment Reporting Information [Line Items]
Sales	1,067	1,040	3,088	3,232
Operating income	136	111	351	328
Intersegment sales
Segment Reporting Information [Line Items]
Sales	(663)	(563)	(1,875)	(1,675)
Operating income	(82)	(68)	(222)	(204)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net FAS (service)/ CAS pension adjustment	131	176	346	440
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	$ (120)	$ 17	$ (398)	$ (123)

Segment Information (Unaudite_4

Segment Information (Unaudited) (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Sales	$ 8,475	$ 8,085	$ 25,120	$ 21,939
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
U.S. government (1)
Revenue, Major Customer [Line Items]
Sales	$ 7,066	$ 6,711	$ 20,767	$ 18,227
Concentration Risk, Percentage	83.00%	83.00%	83.00%	83.00%
U.S. government (1) | Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 3,014	$ 2,926	$ 8,954	$ 8,633
Concentration Risk, Percentage	87.00%	89.00%	87.00%	87.00%
U.S. government (1) | Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,163	$ 972	$ 3,239	$ 1,237
Concentration Risk, Percentage	74.00%	69.00%	72.00%	68.00%
U.S. government (1) | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 2,260	$ 2,232	$ 6,775	$ 6,577
Concentration Risk, Percentage	75.00%	77.00%	75.00%	76.00%
U.S. government (1) | Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 629	$ 581	$ 1,799	$ 1,780
Concentration Risk, Percentage	59.00%	56.00%	58.00%	55.00%
International (2)
Revenue, Major Customer [Line Items]
Sales	$ 1,205	$ 1,099	$ 3,723	$ 3,094
Concentration Risk, Percentage	14.00%	14.00%	15.00%	14.00%
International (2) | Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 353	$ 270	$ 1,137	$ 990
Concentration Risk, Percentage	10.00%	8.00%	11.00%	10.00%
International (2) | Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 228	$ 272	$ 702	$ 364
Concentration Risk, Percentage	14.00%	19.00%	16.00%	20.00%
International (2) | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 416	$ 374	$ 1,242	$ 1,144
Concentration Risk, Percentage	14.00%	12.00%	14.00%	13.00%
International (2) | Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 208	$ 183	$ 642	$ 596
Concentration Risk, Percentage	19.00%	17.00%	21.00%	18.00%
Other customers
Revenue, Major Customer [Line Items]
Sales	$ 204	$ 275	$ 630	$ 618
Concentration Risk, Percentage	3.00%	3.00%	2.00%	3.00%
Other customers | Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 36	$ 44	$ 100	$ 124
Concentration Risk, Percentage	1.00%	2.00%	1.00%	1.00%
Other customers | Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 99	$ 134	$ 331	$ 164
Concentration Risk, Percentage	6.00%	9.00%	7.00%	9.00%
Other customers | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 32	$ 25	$ 105	$ 89
Concentration Risk, Percentage	1.00%	1.00%	1.00%	1.00%
Other customers | Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 37	$ 72	$ 94	$ 241
Concentration Risk, Percentage	4.00%	7.00%	3.00%	8.00%
Intersegment Sales [Member] | Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 55	$ 42	$ 153	$ 152
Concentration Risk, Percentage	2.00%	1.00%	1.00%	2.00%
Intersegment Sales [Member] | Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 94	$ 37	$ 248	$ 50
Concentration Risk, Percentage	6.00%	3.00%	5.00%	3.00%
Intersegment Sales [Member] | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 321	$ 280	$ 921	$ 858
Concentration Risk, Percentage	10.00%	10.00%	10.00%	10.00%
Intersegment Sales [Member] | Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 193	$ 204	$ 553	$ 615
Concentration Risk, Percentage	18.00%	20.00%	18.00%	19.00%
Operating Segments [Member] | Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 3,458	$ 3,282	$ 10,344	$ 9,899
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,584	$ 1,415	$ 4,520	$ 1,815
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 3,029	$ 2,911	$ 9,043	$ 8,668
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,067	$ 1,040	$ 3,088	$ 3,232
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%

Segment Information (Unaudite_5

Segment Information (Unaudited) (Details 3) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Contract Type [Line Items]
Sales	$ 8,475	$ 8,085	$ 25,120	$ 21,939
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Cost-type [Member]
Revenue, Contract Type [Line Items]
Sales	$ 4,076	$ 3,958	$ 12,264	$ 11,201
Concentration Risk, Percentage	48.00%	49.00%	49.00%	51.00%
Cost-type [Member] | Aerospace Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 1,995	$ 1,953	$ 5,976	$ 5,789
Concentration Risk, Percentage	59.00%	60.00%	59.00%	59.00%
Cost-type [Member] | Innovation Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 419	$ 373	$ 1,232	$ 472
Concentration Risk, Percentage	28.00%	27.00%	29.00%	27.00%
Cost-type [Member] | Mission Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 1,264	$ 1,259	$ 3,854	$ 3,745
Concentration Risk, Percentage	47.00%	48.00%	47.00%	48.00%
Cost-type [Member] | Technology Services [Member]
Revenue, Contract Type [Line Items]
Sales	$ 398	$ 373	$ 1,202	$ 1,195
Concentration Risk, Percentage	46.00%	45.00%	47.00%	46.00%
Fixed-price [Member]
Revenue, Contract Type [Line Items]
Sales	$ 4,399	$ 4,127	$ 12,856	$ 10,738
Concentration Risk, Percentage	52.00%	51.00%	51.00%	49.00%
Fixed-price [Member] | Aerospace Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 1,408	$ 1,287	$ 4,215	$ 3,958
Concentration Risk, Percentage	41.00%	40.00%	41.00%	41.00%
Fixed-price [Member] | Innovation Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 1,071	$ 1,005	$ 3,040	$ 1,293
Concentration Risk, Percentage	72.00%	73.00%	71.00%	73.00%
Fixed-price [Member] | Mission Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 1,444	$ 1,372	$ 4,268	$ 4,065
Concentration Risk, Percentage	53.00%	52.00%	53.00%	52.00%
Fixed-price [Member] | Technology Services [Member]
Revenue, Contract Type [Line Items]
Sales	$ 476	$ 463	$ 1,333	$ 1,422
Concentration Risk, Percentage	54.00%	55.00%	53.00%	54.00%
Intersegment sales | Aerospace Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 55	$ 42	$ 153	$ 152
Intersegment sales | Innovation Systems [Member]
Revenue, Contract Type [Line Items]
Sales	94	37	248	50
Intersegment sales | Mission Systems [Member]
Revenue, Contract Type [Line Items]
Sales	321	280	921	858
Intersegment sales | Technology Services [Member]
Revenue, Contract Type [Line Items]
Sales	193	204	553	615
Operating Segments [Member] | Aerospace Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 3,458	$ 3,282	$ 10,344	$ 9,899
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Innovation Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 1,584	$ 1,415	$ 4,520	$ 1,815
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Mission Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 3,029	$ 2,911	$ 9,043	$ 8,668
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Technology Services [Member]
Revenue, Contract Type [Line Items]
Sales	$ 1,067	$ 1,040	$ 3,088	$ 3,232
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%

Segment Information (Unaudite_6

Segment Information (Unaudited) (Details 4) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Geographic Location [Line Items]
Sales	$ 8,475	$ 8,085	$ 25,120	$ 21,939
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
United States
Revenue, Geographic Location [Line Items]
Sales	$ 7,270	$ 6,981	$ 21,397	$ 18,845
Concentration Risk, Percentage	86.00%	86.00%	85.00%	86.00%
United States | Aerospace Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 3,050	$ 2,970	$ 9,054	$ 8,757
Concentration Risk, Percentage	90.00%	92.00%	89.00%	90.00%
United States | Innovation Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 1,262	$ 1,105	$ 3,570	$ 1,401
Concentration Risk, Percentage	85.00%	80.00%	84.00%	79.00%
United States | Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 2,292	$ 2,253	$ 6,880	$ 6,666
Concentration Risk, Percentage	85.00%	86.00%	85.00%	85.00%
United States | Technology Services [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 666	$ 653	$ 1,893	$ 2,021
Concentration Risk, Percentage	76.00%	78.00%	75.00%	77.00%
Asia/Pacific
Revenue, Geographic Location [Line Items]
Sales	$ 390	$ 446	$ 1,342	$ 1,229
Concentration Risk, Percentage	5.00%	6.00%	5.00%	6.00%
Asia/Pacific | Aerospace Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 173	$ 121	$ 632	$ 499
Concentration Risk, Percentage	5.00%	4.00%	6.00%	5.00%
Asia/Pacific | Innovation Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 30	$ 72	$ 123	$ 96
Concentration Risk, Percentage	2.00%	5.00%	3.00%	6.00%
Asia/Pacific | Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 143	$ 208	$ 443	$ 521
Concentration Risk, Percentage	5.00%	8.00%	5.00%	7.00%
Asia/Pacific | Technology Services [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 44	$ 45	$ 144	$ 113
Concentration Risk, Percentage	5.00%	5.00%	6.00%	4.00%
All other
Revenue, Geographic Location [Line Items]
Sales	$ 815	$ 658	$ 2,381	$ 1,865
Concentration Risk, Percentage	9.00%	8.00%	10.00%	8.00%
All other | Aerospace Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 180	$ 149	$ 505	$ 491
Concentration Risk, Percentage	5.00%	4.00%	5.00%	5.00%
All other | Innovation Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 198	$ 201	$ 579	$ 268
Concentration Risk, Percentage	13.00%	15.00%	13.00%	15.00%
All other | Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 273	$ 170	$ 799	$ 623
Concentration Risk, Percentage	10.00%	6.00%	10.00%	8.00%
All other | Technology Services [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 164	$ 138	$ 498	$ 483
Concentration Risk, Percentage	19.00%	17.00%	19.00%	19.00%
Intersegment sales | Aerospace Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 55	$ 42	$ 153	$ 152
Intersegment sales | Innovation Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	94	37	248	50
Intersegment sales | Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	321	280	921	858
Intersegment sales | Technology Services [Member]
Revenue, Geographic Location [Line Items]
Sales	193	204	553	615
Operating Segments [Member] | Aerospace Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 3,458	$ 3,282	$ 10,344	$ 9,899
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Innovation Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 1,584	$ 1,415	$ 4,520	$ 1,815
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 3,029	$ 2,911	$ 9,043	$ 8,668
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Technology Services [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 1,067	$ 1,040	$ 3,088	$ 3,232
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%