Other - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended			11 Months Ended		3 Months Ended		9 Months Ended				1 Months Ended	9 Months Ended	1 Months Ended		1 Months Ended	3 Months Ended		3 Months Ended		3 Months Ended		1 Months Ended
	Sep. 28, 2014	Dec. 31, 2013	Sep. 29, 2013	Mar. 31, 2013	Sep. 28, 2014	Sep. 29, 2013		Sep. 28, 2014	Sep. 25, 2014	Sep. 28, 2014 Contracts Accounted for under Percentage of Completion	Sep. 29, 2013 Contracts Accounted for under Percentage of Completion	Sep. 28, 2014 Contracts Accounted for under Percentage of Completion	Sep. 29, 2013 Contracts Accounted for under Percentage of Completion	Sep. 28, 2014 Business Acquisitions	Sep. 29, 2013 Business Acquisitions	Aug. 31, 2014 New Revolving Credit Facility	Sep. 28, 2014 New Revolving Credit Facility	Aug. 31, 2014 Terminated Revolving Credit Facility	Sep. 28, 2014 Letter of Credit	Nov. 30, 2013 Information Systems & Global Solutions, Mission Systems & Training, and Space Systems Employee	Dec. 31, 2013 Information Systems & Global Solutions	Sep. 28, 2014 Information Systems & Global Solutions Incremental expected costs as a result of the November 2013 restructuring plan	Dec. 31, 2013 Mission Systems and Training	Sep. 28, 2014 Mission Systems and Training Incremental expected costs as a result of the November 2013 restructuring plan	Dec. 31, 2013 Space Systems	Sep. 28, 2014 Space Systems Incremental expected costs as a result of the November 2013 restructuring plan	Jan. 31, 2014 Restricted Stock Units (RSUs)	Jan. 31, 2014 Performance Stock Units (PSUs)	Jan. 31, 2014 Performance Stock Units (PSUs) Minimum	Jan. 31, 2014 Performance Stock Units (PSUs) Maximum	Jan. 31, 2014 Performance Stock Units (PSUs) Half Of PSUs Granted In Period	Jan. 31, 2014 Performance Stock Units (PSUs) Remaining Half Of PSUs Granted In Period
Increase in segment operating profit, from the impact of changes in net profit booking rate adjustments and other matters, net of state income taxes	$ 1,392,000,000		$ 1,254,000,000		$ 4,250,000,000	$ 3,671,000,000				$ 400,000,000	$ 510,000,000	$ 1,400,000,000	$ 1,600,000,000
Increase in net earnings from the impact of changes in net profit booking rate adjustments and other matters	888,000,000		873,000,000		2,710,000,000	2,493,000,000				260,000,000	330,000,000	885,000,000	1,000,000,000
Increase in diluted earnings per share from the impact of changes in net profit booking rate adjustments and other matters	$ 2.76		$ 2.66		$ 8.39	$ 7.63				$ 0.81	$ 1.01	$ 2.74	$ 3.12
Number of employees terminated																				4,000
Expected total accelerated and incremental costs																						15,000,000		50,000,000		175,000,000
Accelerated and incremental costs incurred	78,000,000				78,000,000			78,000,000
Severance charges		171,000,000		30,000,000		30,000,000	[1]														53,000,000		37,000,000		81,000,000
Severance payments					80,000,000			95,000,000
Reduction in net earnings due to severance charges				19,000,000
Decrease in diluted earnings per share due to severance charges				$ 0.06
Effective income tax rates	32.30%		28.20%		32.30%	27.80%
Tax payments, net of refunds received					1,000,000,000	387,000,000
Tax refunds received, from IRS					200,000,000	550,000,000
Net earnings from discontinued operations			31,000,000			31,000,000
Number of shares repurchased under share repurchase program					10.3
Value of stock repurchased under share repurchase program					1,676,000,000	1,563,000,000
Additional share repurchase program authorized amount									2,000,000,000
Remaining authorized repurchase amount under share repurchase program	3,900,000,000				3,900,000,000			3,900,000,000
Common stock par value, per share	$ 1	$ 1			$ 1			$ 1
Additional paid-in capital
Dividends declared	479,000,000		434,000,000		1,763,000,000	1,559,000,000
Dividends declared, per share (in USD)	$ 1.50		$ 1.33		$ 5.49	$ 4.78
Percentage increase in per share quarterly dividend declared	13.00%
Number of stock units, granted, in shares																											0.7	0.2
Average grant date fair value per unit																											$ 146.85				$ 146.85	$ 134.15
Number of years over which equity awards vest																											3 years	3 years
Range of shares that can be earned from stock awards, as a percentage of the target award																													0.00%	200.00%
Acquisitions of businesses and investments in affiliates					622,000,000	266,000,000
Aggregate amount of goodwill arising from acquisitions	10,774,000,000	10,348,000,000			10,774,000,000			10,774,000,000						425,000,000	167,000,000
Aggregate amount allocated to other intangibles arising from acquisitions														138,000,000	34,000,000
Acquired intangible assets, weighted average period of amortization														9 years	8 years
Line of credit facility																1,500,000,000		1,500,000,000	300,000,000
Line of credit facility expiration date																2019-08		2016-08
Additional amount to increase credit facility, granted at banks' discretion																	$ 500,000,000

[1] Severance charges during the nine months ended September 29, 2013 consisted of amounts, net of state tax benefits, associated with the elimination of certain positions at our IS&GS business segment (Note 8, under the caption "Restructuring Charges"). Severance charges for initiatives that are not significant are included in business segment operating profit.