Principal Amount - NGSC Notes

No definition available.

Name:	noc_PrincipalAmountNGSCNotes
Namespace Prefix:	noc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Principal Amount - Northrop Grumman Corporation Notes (Registered Notes)

+ References

No definition available.

+ Details

Name:	noc_PrincipalAmountNorthropGrummanCorporationNotesRegisteredNotes
Namespace Prefix:	noc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Principal Amount - Northrop Grumman Corporation Notes (Unregistered Notes)

+ References

No definition available.

+ Details

Name:	noc_PrincipalAmountNorthropGrummanCorporationNotesUnregisteredNotes
Namespace Prefix:	noc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value as of the balance sheet date of all foreign currency derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(b),(c)(1)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959

+ Details

Name:	us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value as of the balance sheet date of all foreign currency derivative assets not designated as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959

+ Details

Name:	us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amounts in Paragraphs - Fair Value of Financial Instruments (Unaudited) (Details 2) - USD ($) $ in Millions	Jun. 30, 2022	Jun. 15, 2022	Dec. 31, 2021	Sep. 02, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	$ 114		$ 120
Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net	$ 0		$ 0
Principal Amount - NGSC Notes				$ 422
Principal Amount - Northrop Grumman Corporation Notes (Unregistered Notes)		$ 414		$ 422
Principal Amount - Northrop Grumman Corporation Notes (Registered Notes)		$ 414