INFORMATION ON BUSINESS SEGMENTS - Income Statement Information For Each Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Net sales
Net sales	$ 16,220	$ 14,427	$ 31,871	$ 28,763
Aeronautics
Net sales
Net sales	6,503	5,550	12,872	11,134
MFC
Net sales
Net sales	2,801	2,411	5,420	4,761
RMS
Net sales
Net sales	4,039	3,768	7,785	7,530
Space
Net sales
Net sales	2,877	2,698	5,794	5,338
United States
Net sales
Net sales	13,048	10,608	24,443	20,789
United States | Aeronautics
Net sales
Net sales	5,371	3,540	9,419	7,029
United States | MFC
Net sales
Net sales	2,102	1,936	4,061	3,616
United States | RMS
Net sales
Net sales	3,028	2,794	5,919	5,561
United States | Space
Net sales
Net sales	2,547	2,338	5,044	4,583
Asia Pacific
Net sales
Net sales	905	1,311	2,321	2,677
Asia Pacific | Aeronautics
Net sales
Net sales	353	784	1,348	1,690
Asia Pacific | MFC
Net sales
Net sales	72	86	147	208
Asia Pacific | RMS
Net sales
Net sales	464	418	782	748
Asia Pacific | Space
Net sales
Net sales	16	23	44	31
Europe
Net sales
Net sales	1,160	1,421	2,841	2,920
Europe | Aeronautics
Net sales
Net sales	506	847	1,454	1,645
Europe | MFC
Net sales
Net sales	170	103	338	225
Europe | RMS
Net sales
Net sales	170	143	337	341
Europe | Space
Net sales
Net sales	314	328	712	709
Middle East
Net sales
Net sales	868	863	1,804	1,904
Middle East | Aeronautics
Net sales
Net sales	213	335	541	672
Middle East | MFC
Net sales
Net sales	442	272	849	685
Middle East | RMS
Net sales
Net sales	213	247	420	532
Middle East | Space
Net sales
Net sales	0	9	(6)	15
Other
Net sales
Net sales	239	224	462	473
Other | Aeronautics
Net sales
Net sales	60	44	110	98
Other | MFC
Net sales
Net sales	15	14	25	27
Other | RMS
Net sales
Net sales	164	166	327	348
Other | Space
Net sales
Net sales	0	0	0	0
U.S. Government
Net sales
Net sales	12,909	10,383	24,168	20,362
U.S. Government | Aeronautics
Net sales
Net sales	5,352	3,476	9,385	6,911
U.S. Government | MFC
Net sales
Net sales	2,098	1,900	4,053	3,533
U.S. Government | RMS
Net sales
Net sales	2,926	2,675	5,714	5,350
U.S. Government | Space
Net sales
Net sales	2,533	2,332	5,016	4,568
International
Net sales
Net sales	3,172	3,819	7,428	7,974
International | Aeronautics
Net sales
Net sales	1,132	2,010	3,453	4,105
International | MFC
Net sales
Net sales	699	475	1,359	1,145
International | RMS
Net sales
Net sales	1,011	974	1,866	1,969
International | Space
Net sales
Net sales	330	360	750	755
U.S. commercial and other
Net sales
Net sales	139	225	275	427
U.S. commercial and other | Aeronautics
Net sales
Net sales	19	64	34	118
U.S. commercial and other | MFC
Net sales
Net sales	4	36	8	83
U.S. commercial and other | RMS
Net sales
Net sales	102	119	205	211
U.S. commercial and other | Space
Net sales
Net sales	14	6	28	15
Fixed-price
Net sales
Net sales	9,466	8,545	18,769	17,392
Fixed-price | Aeronautics
Net sales
Net sales	4,467	4,040	9,051	8,210
Fixed-price | MFC
Net sales
Net sales	1,877	1,444	3,595	2,979
Fixed-price | RMS
Net sales
Net sales	2,639	2,526	5,121	5,145
Fixed-price | Space
Net sales
Net sales	483	535	1,002	1,058
Cost-reimbursable
Net sales
Net sales	6,754	5,882	13,102	11,371
Cost-reimbursable | Aeronautics
Net sales
Net sales	2,036	1,510	3,821	2,924
Cost-reimbursable | MFC
Net sales
Net sales	924	967	1,825	1,782
Cost-reimbursable | RMS
Net sales
Net sales	1,400	1,242	2,664	2,385
Cost-reimbursable | Space
Net sales
Net sales	2,394	2,163	4,792	4,280
Products
Net sales
Net sales	13,572	12,003	26,738	23,973
Products | Aeronautics
Net sales
Net sales	5,474	4,740	10,929	9,536
Products | MFC
Net sales
Net sales	2,422	1,963	4,697	3,879
Products | RMS
Net sales
Net sales	3,259	3,023	6,245	6,082
Products | Space
Net sales
Net sales	2,417	2,277	4,867	4,476
Services
Net sales
Net sales	2,648	2,424	5,133	4,790
Services | Aeronautics
Net sales
Net sales	1,029	810	1,943	1,598
Services | MFC
Net sales
Net sales	379	448	723	882
Services | RMS
Net sales
Net sales	780	745	1,540	1,448
Services | Space
Net sales
Net sales	$ 460	$ 421	$ 927	$ 862