Additional Options Of Potential Losses

No definition available.

Name:	lmt_AdditionalOptionsOfPotentialLosses
Namespace Prefix:	lmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Estimated Additional Losses Recognized

+ References

No definition available.

+ Details

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

- Definition

Estimated cumulative losses, including reserves, recorded since inception.

+ References

No definition available.

+ Details

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

- Definition

Increase (decrease) in operating profit due to favorable/unfavorable profit rate adjustments.

+ References

No definition available.

+ Details

Name:	lmt_IncreaseDecreaseInOperatingIncomeLoss
Namespace Prefix:	lmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Increase (decrease) in net earnings due to favorable/unfavorable profit rate adjustments.

+ References

No definition available.

+ Details

Name:	lmt_IncreaseDecreaseInOperatingIncomeLossNetOfTax
Namespace Prefix:	lmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Increase (decrease) in diluted earnings per share due to favorable/unfavorable profit rate adjustments.

+ References

No definition available.

+ Details

Name:	lmt_IncreaseDecreaseInOperatingIncomeLossPerShareDilutedNetOfTax
Namespace Prefix:	lmt_
Data Type:	dtr-types1:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Operating Profit Favorable Profit Adjustments

+ References

No definition available.

+ Details

Name:	lmt_OperatingProfitFavorableProfitAdjustments
Namespace Prefix:	lmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Operating Profit Reach-Forward Loss

+ References

No definition available.

+ Details

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

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-4

+ Details

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

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

+ Details

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

- Definition

Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12A

+ Details

Name:	us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-1B

+ Details

Name:	us-gaap_GainLossOnSaleOfBusiness
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_ChangeInAccountingEstimateByTypeAxis=us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=lmt_CanadianGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=lmt_CanadianMaritimeHelicopterProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lmt_MissilesAndFireControlMember
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:

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=lmt_ClassifiedFixedPriceIncentiveFeeContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

OTHER - Contract Estimates (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Sep. 24, 2023	Sep. 29, 2024	Sep. 24, 2023	Mar. 31, 2024
Change in Accounting Estimate [Line Items]
Net profit booking rate adjustments increased sales	$ 358	$ 231	$ 1,000	$ 1,000
Adjustments increased segment operating profit	375	335	990	1,100
Increase in net income (loss)	$ 296	$ 265	$ 782	$ 881
Increase in diluted earnings per common share due to profit rate adjustments (in dollars per share)	$ 1.24	$ 1.06	$ 3.26	$ 3.48
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate [Line Items]
Cumulative gain on development	$ 100		$ 100
Canadian Government
Change in Accounting Estimate [Line Items]
Contract assets	970		970
Canadian Maritime Helicopter Program
Change in Accounting Estimate [Line Items]
Reach-forward loss		$ 100		$ 100
Favorable profit adjustments				$ 65
Missiles and Fire Control
Change in Accounting Estimate [Line Items]
Reach-forward loss					$ 100
Cumulative gain on development					$ 150
Additional options of potential loss			1,300
Aeronautics
Change in Accounting Estimate [Line Items]
Loss on disposition of business	80		145
Aeronautics \| Classified Fixed-Price Incentive Fee Contract
Change in Accounting Estimate [Line Items]
Additional losses	80		145
Cumulative gain on development	$ 415		$ 415