Other - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended			8 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended		3 Months Ended		3 Months Ended		1 Months Ended
	Jun. 29, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 29, 2014	Jun. 30, 2013		Jun. 29, 2014	Jun. 29, 2014 Third quarter of 2014	Jun. 30, 2013 Third quarter of 2013	Nov. 30, 2013 Information Systems & Global Solutions, Mission Systems & Training, and Space Systems Employee	Dec. 31, 2013 Information Systems & Global Solutions	Jun. 29, 2014 Information Systems & Global Solutions Incremental expected costs as a result of the November 2013 restructuring plan	Dec. 31, 2013 Mission Systems and Training	Jun. 29, 2014 Mission Systems and Training Incremental expected costs as a result of the November 2013 restructuring plan	Dec. 31, 2013 Space Systems	Jun. 29, 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	$ 440,000,000		$ 585,000,000		$ 965,000,000	$ 1,100,000,000
Increase in net earnings from the impact of changes in net profit booking rate adjustments and other matters	285,000,000		380,000,000		625,000,000	685,000,000
Increase in diluted earnings per share from the impact of changes in net profit booking rate adjustments and other matters	$ 0.88		$ 1.17		$ 1.93	$ 2.10
Number of shares repurchased under share repurchase program					7.7
Value of stock repurchased under share repurchase program					1,230,000,000	914,000,000
Remaining authorized repurchase amount under share repurchase program	2,300,000,000				2,300,000,000			2,300,000,000
Common stock par value, per share	$ 1	$ 1			$ 1			$ 1
Additional paid-in capital
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%
Dividends declared	856,000,000		754,000,000		1,284,000,000	1,125,000,000			428,000,000	375,000,000
Dividends declared, per share (in USD)	$ 2.66		$ 2.30		$ 3.99	$ 3.45			$ 1.33	$ 1.15
Effective income tax rates	33.70%		29.10%		32.20%	27.50%
Tax refunds received, from IRS					200,000,000	550,000,000
Tax payments, net of refunds received					560,000,000	140,000,000
Number of employees terminated											4,000
Expected total accelerated and incremental costs													15,000,000		50,000,000		135,000,000
Accelerated and incremental costs incurred	50,000,000				50,000,000			50,000,000
Severance charges		171,000,000		30,000,000		30,000,000	[1]					53,000,000		37,000,000		81,000,000
Severance payments					60,000,000			75,000,000
Reduction in net earnings due to severance charges				$ 19,000,000
Decrease in diluted earnings per share due to severance charges				$ 0.06

[1] Severance charges during the six months ended June 30, 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.