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. 27, 2020	Jun. 28, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Net sales
Total net sales	$ 16,495		$ 15,171	$ 48,366	$ 43,934
Operating profit
Total operating profit	2,147		2,105	6,355	6,396
Unallocated items
Equity method investment impairment				128	0
AMMROC
Unallocated items
Equity method investment impairment		$ 128
Equity method investment impairment, after tax		$ 96		$ 96
Equity method investment impairment (in dollars per share)		$ 0.34		$ 0.34
Aeronautics
Net sales
Total net sales	6,680		6,178	$ 19,552	17,312
Missiles and Fire Control
Net sales
Total net sales	2,971		2,601	8,391	7,362
Rotary and Mission Systems
Net sales
Total net sales	3,998		3,709	11,783	11,239
Space
Net sales
Total net sales	2,846		2,683	8,640	8,021
Business Segments
Net sales
Total net sales	16,495		15,171	48,366	43,934
Operating profit
Total operating profit	1,762		1,665	5,277	4,934
Business Segments | Aeronautics
Net sales
Total net sales	6,680		6,178	19,552	17,312
Operating profit
Total operating profit	705		665	2,116	1,842
Business Segments | Missiles and Fire Control
Net sales
Total net sales	2,971		2,601	8,391	7,362
Operating profit
Total operating profit	405		349	1,171	1,093
Business Segments | Rotary and Mission Systems
Net sales
Total net sales	3,998		3,709	11,783	11,239
Operating profit
Total operating profit	404		342	1,209	1,068
Business Segments | Space
Net sales
Total net sales	2,846		2,683	8,640	8,021
Operating profit
Total operating profit	248		309	781	931
Segment Reconciling Items
Unallocated items
FAS/CAS operating adjustment	469		513	1,407	1,537
Stock-based compensation	(67)		(54)	(182)	(158)
Other, net	(17)		(19)	(147)	83
Total unallocated items	385		440	1,078	1,462
Intersegment sales
Net sales
Total net sales	709		729	2,318	2,196
Intersegment sales | Aeronautics
Net sales
Total net sales	59		58	179	147
Intersegment sales | Missiles and Fire Control
Net sales
Total net sales	129		107	405	372
Intersegment sales | Rotary and Mission Systems
Net sales
Total net sales	438		473	1,438	1,433
Intersegment sales | Space
Net sales
Total net sales	$ 83		$ 91	$ 296	$ 244