INFORMATION ON BUSINESS SEGMENTS - Income Statement Information For Each Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Net sales
Net sales	$ 15,651	$ 14,336
Aeronautics
Net sales
Net sales	6,369	5,584
MFC
Net sales
Net sales	2,619	2,350
RMS
Net sales
Net sales	3,746	3,762
Space
Net sales
Net sales	2,917	2,640
United States
Net sales
Net sales	11,395	10,181
United States | Aeronautics
Net sales
Net sales	4,048	3,489
United States | MFC
Net sales
Net sales	1,959	1,680
United States | RMS
Net sales
Net sales	2,891	2,767
United States | Space
Net sales
Net sales	2,497	2,245
Asia Pacific
Net sales
Net sales	1,416	1,366
Asia Pacific | Aeronautics
Net sales
Net sales	995	906
Asia Pacific | MFC
Net sales
Net sales	75	122
Asia Pacific | RMS
Net sales
Net sales	318	330
Asia Pacific | Space
Net sales
Net sales	28	8
Europe
Net sales
Net sales	1,681	1,499
Europe | Aeronautics
Net sales
Net sales	948	798
Europe | MFC
Net sales
Net sales	168	122
Europe | RMS
Net sales
Net sales	167	198
Europe | Space
Net sales
Net sales	398	381
Middle East
Net sales
Net sales	936	1,041
Middle East | Aeronautics
Net sales
Net sales	328	337
Middle East | MFC
Net sales
Net sales	407	413
Middle East | RMS
Net sales
Net sales	207	285
Middle East | Space
Net sales
Net sales	(6)	6
Other
Net sales
Net sales	223	249
Other | Aeronautics
Net sales
Net sales	50	54
Other | MFC
Net sales
Net sales	10	13
Other | RMS
Net sales
Net sales	163	182
Other | Space
Net sales
Net sales	0	0
U.S. Government
Net sales
Net sales	11,259	9,979
U.S. Government | Aeronautics
Net sales
Net sales	4,033	3,435
U.S. Government | MFC
Net sales
Net sales	1,955	1,633
U.S. Government | RMS
Net sales
Net sales	2,788	2,675
U.S. Government | Space
Net sales
Net sales	2,483	2,236
International
Net sales
Net sales	4,256	4,155
International | Aeronautics
Net sales
Net sales	2,321	2,095
International | MFC
Net sales
Net sales	660	670
International | RMS
Net sales
Net sales	855	995
International | Space
Net sales
Net sales	420	395
U.S. commercial and other
Net sales
Net sales	136	202
U.S. commercial and other | Aeronautics
Net sales
Net sales	15	54
U.S. commercial and other | MFC
Net sales
Net sales	4	47
U.S. commercial and other | RMS
Net sales
Net sales	103	92
U.S. commercial and other | Space
Net sales
Net sales	14	9
Fixed-price
Net sales
Net sales	9,303	8,847
Fixed-price | Aeronautics
Net sales
Net sales	4,584	4,170
Fixed-price | MFC
Net sales
Net sales	1,718	1,535
Fixed-price | RMS
Net sales
Net sales	2,482	2,619
Fixed-price | Space
Net sales
Net sales	519	523
Cost-reimbursable
Net sales
Net sales	6,348	5,489
Cost-reimbursable | Aeronautics
Net sales
Net sales	1,785	1,414
Cost-reimbursable | MFC
Net sales
Net sales	901	815
Cost-reimbursable | RMS
Net sales
Net sales	1,264	1,143
Cost-reimbursable | Space
Net sales
Net sales	2,398	2,117
Products
Net sales
Net sales	13,166	11,970
Products | Aeronautics
Net sales
Net sales	5,455	4,796
Products | MFC
Net sales
Net sales	2,275	1,916
Products | RMS
Net sales
Net sales	2,986	3,059
Products | Space
Net sales
Net sales	2,450	2,199
Services
Net sales
Net sales	2,485	2,366
Services | Aeronautics
Net sales
Net sales	914	788
Services | MFC
Net sales
Net sales	344	434
Services | RMS
Net sales
Net sales	760	703
Services | Space
Net sales
Net sales	$ 467	$ 441