Defined Benefit Plan, Pension Plan Benefit Obligation, Plan Assets, Outstanding

No definition available.

Name:	lmt_DefinedBenefitPlanPensionPlanBenefitObligationPlanAssetsOutstanding
Namespace Prefix:	lmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Non-cash, Non-operating Pension Settlement Charge

+ References

No definition available.

+ Details

Name:	lmt_NonCashNonOperatingPensionSettlementCharge
Namespace Prefix:	lmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Non-cash, Non-operating Pension Settlement Charge, After Tax

+ References

No definition available.

+ Details

Name:	lmt_NonCashNonOperatingPensionSettlementChargeAfterTax
Namespace Prefix:	lmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Non-cash, Non-operating Pension Settlement Charge, Per Share, After Tax

+ References

No definition available.

+ Details

Name:	lmt_NonCashNonOperatingPensionSettlementChargePerShareAfterTax
Namespace Prefix:	lmt_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Program net sales as percent of total net sales.

+ References

No definition available.

+ Details

Name:	lmt_ProgramNetSalesAsPercentOfTotalNetSales
Namespace Prefix:	lmt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599

+ Details

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_ProductConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=lmt_FThirtyFiveProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lmt_AeronauticsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

INFORMATION ON BUSINESS SEGMENTS - Narrative (Details) $ / shares in Units, $ in Billions	3 Months Ended		9 Months Ended
	Sep. 25, 2022 USD ($)	Sep. 26, 2021 USD ($) $ / shares	Sep. 25, 2022 USD ($) segment $ / shares	Sep. 26, 2021 USD ($) $ / shares	Jun. 24, 2022 USD ($)	Aug. 03, 2021 USD ($)
Segment Reporting [Abstract]
Number of business segments \| segment			4
Segment Reporting Information [Line Items]
Non-cash, non-operating pension settlement charge	$ 1.5		$ 1.5	$ 1.7
Non-cash, non-operating pension settlement charge, after tax	$ 1.2	$ 1.3	$ 1.2	$ 1.3
Non-cash, non-operating pension settlement charge, per share, after Tax (in dollars per share) \| $ / shares		$ 4.72	$ 4.33	$ 4.72
Outstanding pension benefit obligations and related plan assets					$ 4.3	$ 4.9
Product Concentration Risk \| Sales Revenue, Net \| F-35 Program \| Aeronautics
Segment Reporting Information [Line Items]
Net sales for the F-35 program representing total consolidated net sales (as a percent)	29.00%	28.00%	27.00%	27.00%