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OTHER - Impairment and Other Severance Charges (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 29, 2024	Jun. 30, 2024	Sep. 24, 2023	Sep. 29, 2024	Sep. 24, 2023
Accounting Policies [Abstract]
Impairment and severance charges	$ 0	$ 87	$ 0	$ 87	$ 0
Impairment and severance charges, after-tax		$ 69
Impairment and severance charges, after-tax (in dollars per share)		$ 0.29

X

- Definition

Restructuring Costs And Asset Impairment Charges, After Tax

+ References

No definition available.

+ Details

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X

- Definition

Restructuring Costs And Asset Impairment Charges, Per Share, After-Tax

+ References

No definition available.

+ Details

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Namespace Prefix:	lmt_
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X

- References

No definition available.

+ Details

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X

- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

+ References

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

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