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Postretirement Benefit Plans - Defined Contribution Plan (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Contributions made to defined contribution plans	$ 1,100	$ 1,100	$ 984
Shares of our stock held in defined contribution plans we sponsor (in shares)	27.4	28.9

X

- Definition

Shares of our stock held in defined contribution plans we sponsor.

+ References

No definition available.

+ Details

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Namespace Prefix:	lmt_
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Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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