INFORMATION ON BUSINESS SEGMENTS - Summary of Operating Results For Each Business Segment (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Jun. 24, 2018	Sep. 29, 2019	Sep. 30, 2018
Net sales
Total net sales	$ 15,171	$ 14,318		$ 43,934	$ 39,351
Operating profit
Total operating profit	2,105	1,963		6,396	5,483
Unallocated items
Severance and restructuring charges	0	0		0	96
Aeronautics
Net sales
Total net sales	6,178	5,642		17,312	15,361
Missiles and Fire Control
Net sales
Total net sales	2,601	2,273		7,362	6,035
Rotary and Mission Systems
Net sales
Total net sales	3,709	3,848		11,239	10,637
Unallocated items
Severance and restructuring charges			$ 96
Severance and restructuring charges, net of tax			$ 76
Severance and restructuring charges (in dollars per share)			$ 0.26
Space
Net sales
Total net sales	2,683	2,555		8,021	7,318
Business segments
Net sales
Total net sales	15,171	14,318		43,934	39,351
Operating profit
Total operating profit	1,665	1,586		4,934	4,362
Business segments | Aeronautics
Net sales
Total net sales	6,178	5,642		17,312	15,361
Operating profit
Total operating profit	665	600		1,842	1,646
Business segments | Missiles and Fire Control
Net sales
Total net sales	2,601	2,273		7,362	6,035
Operating profit
Total operating profit	349	332		1,093	872
Business segments | Rotary and Mission Systems
Net sales
Total net sales	3,709	3,848		11,239	10,637
Operating profit
Total operating profit	342	361		1,068	1,013
Business segments | Space
Net sales
Total net sales	2,683	2,555		8,021	7,318
Operating profit
Total operating profit	309	293		931	831
Segment reconciling items
Unallocated items
FAS/CAS operating adjustment	513	451		1,537	1,353
Stock-based compensation	(54)	(50)		(158)	(148)
Severance and restructuring charges	0	0		0	(96)
Other, net	(19)	(24)		83	12
Total unallocated items	440	377		1,462	1,121
Intersegment sales
Net sales
Total net sales	786	764		2,411	2,082
Intersegment sales | Aeronautics
Net sales
Total net sales	58	35		147	87
Intersegment sales | Missiles and Fire Control
Net sales
Total net sales	107	122		372	330
Intersegment sales | Rotary and Mission Systems
Net sales
Total net sales	530	544		1,648	1,509
Intersegment sales | Space
Net sales
Total net sales	$ 91	$ 63		$ 244	$ 156