Other - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions				1 Months Ended			3 Months Ended				9 Months Ended
	Sep. 25, 2016	Sep. 22, 2016	Feb. 20, 2015	Oct. 27, 2016	Sep. 25, 2016	May 31, 2016	Sep. 25, 2016	Mar. 27, 2016	Dec. 31, 2015	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015	Dec. 31, 2016	Aug. 16, 2016
Increase in operating profit due to profit rate adjustments from continuing operations							$ 405			$ 390	$ 1,100	$ 1,300
Increase in net earnings due to profit rate adjustments							$ 265			$ 255	$ 730	$ 865
Increase in diluted earnings per common share due to profit rate adjustments							$ 0.88			$ 0.82	$ 2.39	$ 2.73
Repayment of long-term notes											$ 952
Severance charges									$ 82	$ 82	$ 99	$ 35
Effective income tax rate for earnings from continuing operations							23.70%			30.60%	23.10%	30.40%
Cash paid for repurchases of common stock											$ 1,280	$ 2,364
Number of shares of common stock repurchased with cash											5,700,000
Remaining authorized repurchase amount under share repurchase program	$ 4,300				$ 4,300		$ 4,300				$ 4,300
Additional paid-in capital	$ 0				$ 0		$ 0		$ 0		$ 0
Common stock par value, per share	$ 1				$ 1		$ 1		$ 1		$ 1
Additional share repurchase program authorized amount		$ 2,000
Dividends declared							$ 537			$ 507	$ 2,056	$ 1,926
Dividends declared, per share (in USD)							$ 1.82			$ 1.65	$ 6.77	$ 6.15
Quarterly increase dividend rate		10.00%
Increase quarterly dividend, per share		$ 0.17
Deferred income taxes assets, noncurrent	$ 5,850				$ 5,850		$ 5,850		$ 6,068		$ 5,850
Variable Interest Rate Swap | Designated as hedges
Aggregate notional amount of derivatives						$ 450
Sikorsky Aircraft Corporation
Restructuring cost expected in 2016	40				40		40				40
Restructuring cost incurred											$ 35
Restricted Stock Units (RSUs)
Number of stock units, granted, in shares											700,000
Average grant date fair value per unit											$ 206.69
Number of years over which equity awards vest											3 years
Scenario, Forecast | Sikorsky Aircraft Corporation
Restructuring cost expected to be incurred													$ 5
Accounting Standards Update 2016-09 | Adjustments for New Accounting Principle, Early Adoption
Excess income tax benefit from share-based compensation, financing activities							104
Excess income tax benefit recognized in additional paid-in capital							104
Accounting Standards Update 2016-09 | Restatement Adjustment | Adjustments for New Accounting Principle, Early Adoption
Excess income tax benefit from share-based compensation, operating activities							22				$ 137
Additional income tax benefit							$ 22				$ 137
Additional income tax benefit, per share							$ 0.07				$ 0.45
Accounting Standards Update 2015-17 | Restatement Adjustment
Deferred income taxes assets, noncurrent									1,600
Deferred income taxes liabilities, noncurrent									140
Accounting Standards Update 2015-17 | Scenario, Previously Reported
Deferred income taxes assets, current									1,600
Deferred income taxes liabilities, current									140
2016 Fourth Quarter Dividend
Dividends declared											$ 537
Dividends declared, per share (in USD)											$ 1.82
2015 Fourth Quarter Dividend
Dividends declared												$ 507
Dividends declared, per share (in USD)												$ 1.65
2016 Action
Severance charges							$ 31
Severance payments	56
2015 Action
Severance charges							$ 25
Severance payments	$ 45
Aeronautics
Severance charges								$ 80
Information Systems & Global Solutions
Severance charges									15	$ 15
Information Systems & Global Solutions | Net earnings from discontinued operations
Severance charges								$ 19	20	20
Rotary and Mission Systems
Severance charges									$ 67	$ 67
Information Systems & Global Solutions
Percentage of reduction in common stock outstanding														3.00%
Information Systems & Global Solutions | Lockheed Martin
Number of common stock exchanged														9,369,694
2.13% Long-term notes
Repayment of long-term notes					$ 500
Long-term notes, fixed Interest	2.13%				2.13%		2.13%				2.13%
7.65% Long-term notes
Repayment of long-term notes						$ 452
Long-term notes, fixed Interest						7.65%
February Twenty Fifteen Notes
Amount of issued debt			$ 2,250
2.90% Notes Due 2025
Amount of issued debt			$ 750
Long-term debt maturity year			2025
Interest Rate			2.90%
3.60% Notes Due 2035
Amount of issued debt			$ 500
Long-term debt maturity year			2035
Interest Rate			3.60%
3.80% Notes Due 2045
Amount of issued debt			$ 1,000
Long-term debt maturity year			2045
Interest Rate			3.80%
Five Year Revolving Credit Facility | Unsecured Debt | Subsequent Event
Line of credit facility				$ 2,500
Line of credit facility expiration period				5 years
Line of credit facility extended expiration period				1 year
Line of credit facility expiration date				Oct. 09, 2020
Line of credit facility extended expiration date				Oct. 09, 2021