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Inventories (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Inventory [Line Items]
Work-in-process, primarily related to long-term contracts and programs in progress	$ 8,199	$ 6,731
Less: customer advances and progress payments	(5,035)	(4,701)
Inventory for long term contracts or programs net of customer advances and progress payments	3,164	2,030
Other inventories	1,798	774
Total inventories, net	$ 4,962	$ 2,804

X

- Definition

Inventories associated with long-term contracts or programs, net of customer advances and progress payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	lmt_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Amount before valuation and LIFO reserves, and progress payments, of inventory associated with long-term contracts, expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a),(d))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Period Type:	instant

X

- 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

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Carrying amount (lower of cost or market) of inventories less all valuation, other allowances, and progress payments or customer advances received on long-term contracts or programs. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount before valuation and LIFO reserves of other inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Amount of advances received from customers under long-term contracts which have been offset against inventories accounts at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(d)(iii))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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