Significant Accounting Policies (Policies) (Unaudited)	6 Months Ended
Jun. 30, 2011
Significant Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation – The unaudited condensed consolidated financial statements include the accounts of Northrop Grumman Corporation and its subsidiaries (Northrop Grumman or the company). All material intercompany accounts, transactions, and profits are eliminated in consolidation.
Basis of presentation	The accompanying unaudited condensed consolidated financial statements of the company have been prepared by management in accordance with the rules of the Securities and Exchange Commission (SEC). These statements include all adjustments of normal recurring nature considered necessary by management for a fair presentation of the 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 Annual Report on Form 10-K for the year ended December 31, 2010, and the audited consolidated financial statements, including the notes thereto, contained in the Form 8-K filed on June 17, 2011, which recast certain portions of the Form 10-K to reflect the spin-off of the Shipbuilding business as discontinued operations, as discussed below. The quarterly information is labeled using a calendar convention; that is, first quarter is consistently labeled as ending on March 31, second quarter as ending on June 30, and third quarter as ending on September 30. It is management’s long-standing practice to establish actual interim closing dates using a “fiscal” calendar, which requires the businesses to close their books on a Friday near these quarter-end dates in order to normalize the potentially disruptive effects of quarterly closings on business processes. The effects of this practice only exist within a reporting year.
Financial Statement Reclassification	Spin-off of Shipbuilding Business – Effective as of March 31, 2011, the company completed the spin-off to its shareholders of Huntington Ingalls Industries (HII). HII will operate the business that was previously the Shipbuilding segment (Shipbuilding) of the company prior to the spin-off. The spin-off was the culmination of the company’s decision to explore strategic alternatives for Shipbuilding as it was determined to be in the best interests of shareholders, customers, and employees by allowing both the company and Shipbuilding to pursue more effectively their respective opportunities to maximize value. As a result of the spin-off, assets, liabilities and results of operations for the former Shipbuilding segment have been reclassified as discontinued operations for all periods presented. See Note 5 for further information.
Accounting Estimates	Accounting Estimates – The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). The preparation thereof requires management to make estimates and judgments that affect the reported amounts of assets and liabilities and the disclosure of contingencies at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Estimates have been prepared on the basis of the most current and best available information and actual results could differ materially from those estimates.
Investments in marketable securities	Investments in Marketable Securities – The company holds a portfolio of marketable securities, primarily consisting of equity securities that are classified as either trading or available-for-sale and can be liquidated without restriction. These assets are recorded at fair value, substantially all of which are based upon quoted market prices for identical instruments in active markets (Level 1 inputs). In June 2011, the company sold marketable securities classified as trading securities for $69 million, resulting in a $3 million realized gain on the sale of securities. As of June 30, 2011, and December 31, 2010, there were marketable equity securities of $2 million and $68 million, respectively, included in prepaid expenses and other current assets and there were marketable equity securities of $242 million and $262 million, respectively, included in miscellaneous other assets in the condensed consolidated statements of financial position.
Derivative financial instruments	Derivative financial instruments are recognized as assets or liabilities in the financial statements and measured at fair value, substantially all of which are based on active or inactive markets for identical or similar instruments or model-derived valuations whose inputs are observable (Level 2 inputs). Where model-derived valuations are appropriate, the company utilizes the income approach to determine fair value and uses the applicable London Interbank Offered Rate (LIBOR) swap rate as the discount rate. Changes in the fair value of derivative financial instruments that qualify and are designated as fair value hedges are recorded in earnings from continuing operations, while the effective portion of the changes in the fair value of derivative financial instruments that qualify and are designated as effective cash flow hedges are recorded in other comprehensive income. Credit risk related to derivative financial instruments is considered minimal and is managed by requiring high credit standards for counterparties and through periodic settlements of positions.
Environmental costs	The estimated cost to complete remediation has been accrued where it is probable that the company will incur such costs in the future to address environmental impacts at currently or formerly owned or leased operating facilities, or at sites where it has been named a Potentially Responsible Party (PRP) by the Environmental Protection Agency, or similarly designated by other environmental agencies. These accruals do not include any litigation costs or potential liabilities to third parties related to environmental matters, nor do they include amounts recorded as asset retirement obligations. To assess the potential impact on the company’s financial statements, management estimates the range of reasonably possible remediation costs that could be incurred by the company, taking into account currently available facts on each site, as well as the current state of technology and prior experience in remediating contaminated sites. These estimates are reviewed periodically and adjusted to reflect changes in facts and technical and legal circumstances.
Stock compensation	The fair value of each of the company’s stock option awards is estimated on the date of grant using a Black-Scholes option pricing model that uses the assumptions noted in the table below. The dividend yield represents the current annual dividend yield at the time stock options are awarded. Expected volatility is based on an average of (1) historical volatility of the company’s stock and (2) implied volatility from traded options on the company’s stock. The risk-free rate for periods within the contractual life of the stock option award is based on the yield curve of a zero-coupon U.S. Treasury bond on the date the award is granted with a maturity equal to the expected term of the award. The company uses historical data to estimate future forfeitures. The expected term of awards granted is derived from historical experience under the company’s stock-based compensation plans and represents the period of time that awards granted are expected to be outstanding. The fair value of the company’s stock option awards is expensed on a straight-line basis over the vesting period of the options, which is generally three to four years. Compensation expense for stock awards is measured at the grant date based on fair value and recognized over the vesting period, generally three years. The fair value of performance-based stock awards is determined based on the closing market price of the company’s common stock on the grant date. For purposes of measuring compensation expense for performance-based stock awards, the amount of shares ultimately expected to vest is estimated at each reporting date based on management’s expectations regarding the relevant performance criteria. The fair value of market-based stock awards is determined at the grant date using a Monte Carlo simulation model.

Significant Accounting Policies (Policies) (Unaudited)

6 Months Ended

Jun. 30, 2011

Significant Accounting Policies [Abstract]

Principles of Consolidation – The unaudited condensed consolidated financial statements include the accounts of Northrop Grumman Corporation and its subsidiaries (Northrop Grumman or the company). All material intercompany accounts, transactions, and profits are eliminated in consolidation.

Basis of presentation

The accompanying unaudited condensed consolidated financial statements of the company have been prepared by management in accordance with the rules of the Securities and Exchange Commission (SEC). These statements include all adjustments of normal recurring nature considered necessary by management for a fair presentation of the 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 Annual Report on Form 10-K for the year ended December 31, 2010, and the audited consolidated financial statements, including the notes thereto, contained in the Form 8-K filed on June 17, 2011, which recast certain portions of the Form 10-K to reflect the spin-off of the Shipbuilding business as discontinued operations, as discussed below.

The quarterly information is labeled using a calendar convention; that is, first quarter is consistently labeled as ending on March 31, second quarter as ending on June 30, and third quarter as ending on September 30. It is management’s long-standing practice to establish actual interim closing dates using a “fiscal” calendar, which requires the businesses to close their books on a Friday near these quarter-end dates in order to normalize the potentially disruptive effects of quarterly closings on business processes. The effects of this practice only exist within a reporting year.

Financial Statement Reclassification

Spin-off of Shipbuilding Business – Effective as of March 31, 2011, the company completed the spin-off to its shareholders of Huntington Ingalls Industries (HII). HII will operate the business that was previously the Shipbuilding segment (Shipbuilding) of the company prior to the spin-off. The spin-off was the culmination of the company’s decision to explore strategic alternatives for Shipbuilding as it was determined to be in the best interests of shareholders, customers, and employees by allowing both the company and Shipbuilding to pursue more effectively their respective opportunities to maximize value. As a result of the spin-off, assets, liabilities and results of operations for the former Shipbuilding segment have been reclassified as discontinued operations for all periods presented. See Note 5 for further information.

Accounting Estimates

Accounting Estimates – The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). The preparation thereof requires management to make estimates and judgments that affect the reported amounts of assets and liabilities and the disclosure of contingencies at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Estimates have been prepared on the basis of the most current and best available information and actual results could differ materially from those estimates.

Investments in marketable securities

Investments in Marketable Securities – The company holds a portfolio of marketable securities, primarily consisting of equity securities that are classified as either trading or available-for-sale and can be liquidated without restriction. These assets are recorded at fair value, substantially all of which are based upon quoted market prices for identical instruments in active markets (Level 1 inputs). In June 2011, the company sold marketable securities classified as trading securities for $69 million, resulting in a $3 million realized gain on the sale of securities. As of June 30, 2011, and December 31, 2010, there were marketable equity securities of $2 million and $68 million, respectively, included in prepaid expenses and other current assets and there were marketable equity securities of $242 million and $262 million, respectively, included in miscellaneous other assets in the condensed consolidated statements of financial position.

Derivative financial instruments

Derivative financial instruments are recognized as assets or liabilities in the financial statements and measured at fair value, substantially all of which are based on active or inactive markets for identical or similar instruments or model-derived valuations whose inputs are observable (Level 2 inputs). Where model-derived valuations are appropriate, the company utilizes the income approach to determine fair value and uses the applicable London Interbank Offered Rate (LIBOR) swap rate as the discount rate. Changes in the fair value of derivative financial instruments that qualify and are designated as fair value hedges are recorded in earnings from continuing operations, while the effective portion of the changes in the fair value of derivative financial instruments that qualify and are designated as effective cash flow hedges are recorded in other comprehensive income. Credit risk related to derivative financial instruments is considered minimal and is managed by requiring high credit standards for counterparties and through periodic settlements of positions.

Environmental costs

The estimated cost to complete remediation has been accrued where it is probable that the company will incur such costs in the future to address environmental impacts at currently or formerly owned or leased operating facilities, or at sites where it has been named a Potentially Responsible Party (PRP) by the Environmental Protection Agency, or similarly designated by other environmental agencies. These accruals do not include any litigation costs or potential liabilities to third parties related to environmental matters, nor do they include amounts recorded as asset retirement obligations. To assess the potential impact on the company’s financial statements, management estimates the range of reasonably possible remediation costs that could be incurred by the company, taking into account currently available facts on each site, as well as the current state of technology and prior experience in remediating contaminated sites. These estimates are reviewed periodically and adjusted to reflect changes in facts and technical and legal circumstances.

Stock compensation

The fair value of each of the company’s stock option awards is estimated on the date of grant using a Black-Scholes option pricing model that uses the assumptions noted in the table below. The dividend yield represents the current annual dividend yield at the time stock options are awarded. Expected volatility is based on an average of (1) historical volatility of the company’s stock and (2) implied volatility from traded options on the company’s stock. The risk-free rate for periods within the contractual life of the stock option award is based on the yield curve of a zero-coupon U.S. Treasury bond on the date the award is granted with a maturity equal to the expected term of the award. The company uses historical data to estimate future forfeitures. The expected term of awards granted is derived from historical experience under the company’s stock-based compensation plans and represents the period of time that awards granted are expected to be outstanding. The fair value of the company’s stock option awards is expensed on a straight-line basis over the vesting period of the options, which is generally three to four years.

Compensation expense for stock awards is measured at the grant date based on fair value and recognized over the vesting period, generally three years. The fair value of performance-based stock awards is determined based on the closing market price of the company’s common stock on the grant date. For purposes of measuring compensation expense for performance-based stock awards, the amount of shares ultimately expected to vest is estimated at each reporting date based on management’s expectations regarding the relevant performance criteria. The fair value of market-based stock awards is determined at the grant date using a Monte Carlo simulation model.

- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

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+ Details

- Definition

Disclosure of accounting policy for its derivative instruments and hedging activities. Disclosure may include: (1) Each method used to account for derivative financial instruments and derivative commodity instruments ("derivatives"); (2) the types of derivatives accounted for under each method; (3) the criteria required to be met for each accounting method used, including a discussion of the criteria required to be met for hedge or deferral accounting and accrual or settlement accounting (for example, whether and how risk reduction, correlation, designation, and effectiveness tests are applied); (4) the accounting method used if the criteria specified for hedge accounting are not met; (5) the method used to account for termination of derivatives designated as hedges or derivatives used to affect directly or indirectly the terms, fair values, or cash flows of a designated item; (6) the method used to account for derivatives when the designated item matures, is sold, is extinguished, or is terminated. In addition, the method used to account for derivatives designated to an anticipated transaction, when the anticipated transaction is no longer likely to occur; and (7) where and when derivatives, and their related gains or losses are reported in the statement of financial position, cash flows, and results of operations and (8) an accounting policy decision to offset fair value amounts with counterparties. An entity may also describe its embedded derivatives, and the method(s) used to determine the fair values of derivatives and any significant assumptions used in such valuations.

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- Definition

Disclosure of accounting policy for obligations that resulted from improper or other-than normal operation of a long-lived asset in the past. This accounting policy may address (1) whether the related remediation costs are expensed or capitalized, (2) whether the obligation is measured on a discounted basis, (3) the event, situation, or set of circumstances that generally triggers recognition of loss contingencies arising from the entity's environmental remediation-related obligations, and (4) the timing of recognition of any recoveries.

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- Definition

Disclosure of accounting policy for investments in financial assets, including marketable securities (debt and equity securities with readily determinable fair values), investments accounted for under the equity method and cost method, securities borrowed and loaned, and repurchase and resale agreements. For marketable securities, the disclosure may include the entity's accounting treatment for transfers between investment categories and how the fair values for such securities are determined. Also, for all investments, an entity may describe its policy for assessing, recognizing and measuring impairment of the investment.

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-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 2, 12
-Article 5

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 7-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

+ Details

- Definition

Disclosure of accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement.

+ References+ Details

- Definition

Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.

+ References+ Details