Summary of Financial Information for Each Business Segment (Detail) - USD ($) $ in Millions		3 Months Ended											12 Months Ended
		Dec. 31, 2015		Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Segment Reporting Information [Line Items]
Total net sales		$ 12,917	[1]	$ 11,461	$ 11,643	$ 10,111	$ 12,530	$ 11,114	$ 11,306	$ 10,650			$ 46,132		$ 45,600		$ 45,358
Less: CAS pension cost	[2]												1,613		1,520		1,466
FAS/CAS pension income (expense)													471		376		(482)
Goodwill impairment charges							(119)				$ (195)				(119)	[3],[4]	(195)	[4]
Severance charges												$ (30)	(102)	[5]			(201)	[5]
Stock-based compensation													(138)		(164)		(189)
Other, net	[6],[7]												(281)		(89)		(180)
Total unallocated items													(50)		4		(1,247)
Operating profit		1,281	[1]	$ 1,354	$ 1,445	$ 1,356	1,342	$ 1,392	$ 1,426	$ 1,432			5,436		5,592		4,505
Total depreciation and amortization													1,026		994		990
Capitalized expenditures													939		845		836
Total assets		49,128					37,046						49,128		37,046
Total customer advances and amounts in excess of costs incurred		6,988					5,775						6,988		5,775
Qualified defined benefit pension plans
Segment Reporting Information [Line Items]
FAS pension expense	[8],[9]												(1,142)		(1,144)		(1,948)
Information Systems & Global Solutions
Segment Reporting Information [Line Items]
Goodwill impairment charges	[3]														(119)
Severance charges													(35)				(83)
Mission Systems and Training
Segment Reporting Information [Line Items]
Severance charges													(67)				(37)
Space Systems
Segment Reporting Information [Line Items]
Severance charges																	(81)
Goodwill by Segment
Segment Reporting Information [Line Items]
Operating profit													5,486		5,588		5,752
Total depreciation and amortization													928		887		883
Capitalized expenditures													879		779		765
Total assets	[10]	38,899					26,484						38,899		26,484
Goodwill by Segment | Aeronautics
Segment Reporting Information [Line Items]
Total net sales													15,570		14,920		14,123
Operating profit													1,681		1,649		1,612
Total depreciation and amortization													317		322		318
Capitalized expenditures													387		283		271
Total assets	[10]	6,618					6,042						6,618		6,042
Total customer advances and amounts in excess of costs incurred		2,045					2,191						2,045		2,191
Goodwill by Segment | Information Systems & Global Solutions
Segment Reporting Information [Line Items]
Total net sales													5,596		5,654		6,115
Operating profit													508		472		498
Total depreciation and amortization													101		47		48
Capitalized expenditures													31		18		33
Total assets	[10]	4,206					4,268						4,206		4,268
Total customer advances and amounts in excess of costs incurred		285					227						285		227
Goodwill by Segment | Missiles and Fire Control
Segment Reporting Information [Line Items]
Total net sales													6,770		7,092		6,795
Operating profit													1,282		1,344		1,379
Total depreciation and amortization													99		99		98
Capitalized expenditures													120		142		128
Total assets	[10]	4,027					3,977						4,027		3,977
Total customer advances and amounts in excess of costs incurred		1,766					1,803						1,766		1,803
Goodwill by Segment | Mission Systems and Training
Segment Reporting Information [Line Items]
Total net sales													9,091		8,732		9,037
Operating profit													844		936		1,065
Total depreciation and amortization													203		175		194
Capitalized expenditures													169		164		146
Total assets	[10]	19,187					7,465						19,187		7,465
Total customer advances and amounts in excess of costs incurred		2,415					1,148						2,415		1,148
Goodwill by Segment | Space Systems
Segment Reporting Information [Line Items]
Total net sales													9,105		9,202		9,288
Operating profit													1,171		1,187		1,198
Total depreciation and amortization													208		244		225
Capitalized expenditures													172		172		187
Total assets	[10]	4,861					4,732						4,861		4,732
Total customer advances and amounts in excess of costs incurred		477					406						477		406
Intersegment elimination
Segment Reporting Information [Line Items]
Total intersegment sales													2,142		1,750		1,586
Intersegment elimination | Aeronautics
Segment Reporting Information [Line Items]
Total intersegment sales													102		104		203
Intersegment elimination | Information Systems & Global Solutions
Segment Reporting Information [Line Items]
Total intersegment sales													53		12		14
Intersegment elimination | Missiles and Fire Control
Segment Reporting Information [Line Items]
Total intersegment sales													313		255		220
Intersegment elimination | Mission Systems and Training
Segment Reporting Information [Line Items]
Total intersegment sales													1,529		1,243		1,030
Intersegment elimination | Space Systems
Segment Reporting Information [Line Items]
Total intersegment sales													145		136		119
Corporate
Segment Reporting Information [Line Items]
Total depreciation and amortization													98		107		107
Capitalized expenditures													60		66		$ 71
Total assets	[11]	$ 10,229					$ 10,562						$ 10,229		$ 10,562

[1] The fourth quarter of 2015 incorporates the results of Sikorsky from the November 6, 2015 acquisition date through December 31, 2015, including approximately $400 million in net sales and about $45 million in operating loss, inclusive of intangible amortization and adjustments required to account for the acquisition.

[2] The higher CAS pension cost primarily reflects the impact of phasing in CAS Harmonization.

[3] The impairment in 2014 relates to our Technical Services reporting unit within our IS&GS business segment (Note 1).

[4] We recognized non-cash goodwill impairment charges related to the Technical Services reporting unit within our MFC business segment in 2014 and 2013. See Note 1 for more information.

[5] See Note 15 for information on charges related to certain severance actions at our business segments. Severance charges for initiatives that are not significant are included in business segment operating profit.

[6] Other, net in 2015 includes a non-cash asset impairment charge of approximately $90 million related to our decision to divest Lockheed Martin Commercial Flight Training (LMCFT) in 2016. This charge was partially offset by a net deferred tax benefit of about $80 million, which is recorded in income tax expense. The net impact reduced net earnings by about $10 million.

[7] Other, net in 2015 includes approximately $45 million of non-recoverable transaction costs associated with the acquisition of Sikorsky and the strategic review of our government IT and technical services businesses.

[8] FAS pension expense in 2015 and 2014 was less than in 2013 primarily due to the June 2014 plan amendments to certain of our defined benefit pension plans to freeze future retirement benefits, partially offset by the impact of using new longevity assumptions (Note 11).

[9] Total net periodic benefit cost associated with our qualified defined benefit plans represents pension expense calculated in accordance with GAAP (FAS pension expense). We are required to calculate pension expense in accordance with both GAAP and CAS rules, each of which results in a different calculated amount of pension expense. The CAS pension cost is recovered through the pricing of our products and services on U.S. Government contracts and, therefore, is recognized in net sales and cost of sales for products and services. We include the difference between FAS pension expense and CAS pension cost, referred to as the FAS/CAS pension adjustment, as a component of other unallocated, net on our Statements of Earnings. The FAS/CAS pension adjustment, which was income of $471 million in 2015; income of $376 million in 2014; and expense of $482 million in 2013, effectively adjusts the amount of CAS pension cost in the business segment operating profit so that pension expense recorded on our Statements of Earnings is equal to FAS pension expense.

[10] We have no significant long-lived assets located in foreign countries.

[11] Corporate assets primarily include cash and cash equivalents, deferred income taxes, environmental receivables and investments held in a separate trust.