INFORMATION ON BUSINESS SEGMENTS - Summary of Operating Results For Each Business Segment (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 26, 2021	Mar. 28, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Net sales
Total net sales	$ 16,028		$ 16,495	$ 49,315	$ 48,366
Operating profit
Total operating profit	2,294		2,147	6,668	6,355
Unallocated items
Severance and restructuring charges	0	$ 36	0	36	0
Aeronautics
Net sales
Total net sales	6,568		6,680	19,621	19,552
Missiles and Fire Control
Net sales
Total net sales	2,781		2,971	8,474	8,391
Rotary and Mission Systems
Net sales
Total net sales	3,980		3,998	12,329	11,783
Space
Net sales
Total net sales	2,699		2,846	8,891	8,640
Business Segments
Net sales
Total net sales	16,028		16,495	49,315	48,366
Amortization of purchased intangibles	(61)		(66)	(223)	(197)
Operating profit
Total operating profit	1,850		1,762	5,365	5,277
Business Segments | Aeronautics
Net sales
Total net sales	6,568		6,680	19,621	19,552
Amortization of purchased intangibles	0		0	(1)	0
Operating profit
Total operating profit	714		705	1,979	2,116
Business Segments | Missiles and Fire Control
Net sales
Total net sales	2,781		2,971	8,474	8,391
Amortization of purchased intangibles	(1)		(1)	(2)	(2)
Operating profit
Total operating profit	413		405	1,210	1,171
Business Segments | Rotary and Mission Systems
Net sales
Total net sales	3,980		3,998	12,329	11,783
Amortization of purchased intangibles	(58)		(58)	(174)	(174)
Operating profit
Total operating profit	459		404	1,350	1,209
Business Segments | Space
Net sales
Total net sales	2,699		2,846	8,891	8,640
Amortization of purchased intangibles	(2)		(7)	(46)	(21)
Operating profit
Total operating profit	264		248	826	781
Unallocated items
Unallocated items
FAS/CAS operating adjustment	491		469	1,469	1,407
Stock-based compensation	(62)		(67)	(189)	(182)
Severance and restructuring charges	0		0	(36)	0
Other, net	15		(17)	59	(147)
Total unallocated items	444		385	1,303	1,078
Intersegment sales
Net sales
Total net sales	763		709	2,264	2,318
Intersegment sales | Aeronautics
Net sales
Total net sales	60		59	165	179
Intersegment sales | Missiles and Fire Control
Net sales
Total net sales	153		129	449	405
Intersegment sales | Rotary and Mission Systems
Net sales
Total net sales	455		438	1,381	1,438
Intersegment sales | Space
Net sales
Total net sales	$ 95		$ 83	$ 269	$ 296