Summary of Financial Information for Each Business Segment (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total net sales		$ 12,685	$ 11,577	$ 23,742	$ 21,945
Less: CAS pension cost		562	473	1,124	948
FAS/CAS pension adjustment		219	222	436	446
Stock-based compensation		(57)	(52)	(101)	(96)
Severance charges					(80)
Other, net	[1],[2]	(5)	(68)	(80)	(124)
Total unallocated items		157	102	255	146
Operating profit		1,485	1,375	2,634	2,533
Total assets		48,711		48,711		$ 47,806
Qualified defined benefit pension plans
Segment Reporting Information [Line Items]
FAS pension expense		(343)	(251)	(688)	(502)
Operating Segments
Segment Reporting Information [Line Items]
Operating profit		1,328	1,273	2,379	2,387
Total assets		36,119		36,119		35,513
Operating Segments | Aeronautics
Segment Reporting Information [Line Items]
Total net sales		5,225	4,375	9,331	8,174
Operating profit		550	478	986	898
Total assets		7,631		7,631		7,896
Operating Segments | Missiles and Fire Control
Segment Reporting Information [Line Items]
Total net sales		1,637	1,680	3,126	3,114
Operating profit		268	253	487	474
Total assets		4,463		4,463		4,000
Operating Segments | Rotary and Mission Systems
Segment Reporting Information [Line Items]
Total net sales		3,410	3,303	6,511	6,307
Operating profit		254	202	362	431
Total assets		18,496		18,496		18,367
Operating Segments | Space Systems
Segment Reporting Information [Line Items]
Total net sales		2,413	2,219	4,774	4,350
Operating profit		256	340	544	584
Total assets		5,529		5,529		5,250
Intersegment elimination
Segment Reporting Information [Line Items]
Total intersegment sales		684	610	1,245	1,201
Intersegment elimination | Aeronautics
Segment Reporting Information [Line Items]
Total intersegment sales		33	39	65	75
Intersegment elimination | Missiles and Fire Control
Segment Reporting Information [Line Items]
Total intersegment sales		85	69	149	144
Intersegment elimination | Rotary and Mission Systems
Segment Reporting Information [Line Items]
Total intersegment sales		547	466	986	913
Intersegment elimination | Space Systems
Segment Reporting Information [Line Items]
Total intersegment sales		19	$ 36	45	$ 69
Corporate
Segment Reporting Information [Line Items]
Total assets	[3]	$ 12,592		$ 12,592		$ 12,293

[1] During the six months ended June 25, 2017, we recognized a $64 million charge, which represents our portion of a noncash asset impairment charge recorded by our equity method investee, Advanced Military Maintenance, Repair and Overhaul Center LLC. See "Note 10 - Other" (under the caption "Equity Method Investee Impairment") for more information.

[2] Includes $30 million and $65 million of corporate overhead costs incurred during the quarter and six months ended June 26, 2016 that were previously allocated to our former IS&GS business. See "Note 3 - Divestiture" for more information.

[3] Corporate assets primarily include cash and cash equivalents, deferred income taxes, environmental receivables and investments held in a separate trust to fund certain of our non-qualified deferred compensation plans.