INFORMATION ON BUSINESS SEGMENTS - Income Statement Information For Each Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 24, 2018	Jun. 30, 2019	Jun. 24, 2018
Net sales
Net sales	$ 14,427	$ 13,398	$ 28,763	$ 25,033
Aeronautics
Net sales
Net sales	5,550	5,321	11,134	9,719
MFC
Net sales
Net sales	2,411	2,085	4,761	3,762
RMS
Net sales
Net sales	3,768	3,566	7,530	6,789
Space
Net sales
Net sales	2,698	2,426	5,338	4,763
United States
Net sales
Net sales	10,608	9,855	20,789	18,122
United States | Aeronautics
Net sales
Net sales	3,540	3,486	7,029	6,307
United States | MFC
Net sales
Net sales	1,936	1,543	3,616	2,666
United States | RMS
Net sales
Net sales	2,794	2,744	5,561	5,186
United States | Space
Net sales
Net sales	2,338	2,082	4,583	3,963
Asia Pacific
Net sales
Net sales	1,311	1,243	2,677	2,442
Asia Pacific | Aeronautics
Net sales
Net sales	784	786	1,690	1,540
Asia Pacific | MFC
Net sales
Net sales	86	125	208	223
Asia Pacific | RMS
Net sales
Net sales	418	301	748	625
Asia Pacific | Space
Net sales
Net sales	23	31	31	54
Europe
Net sales
Net sales	1,421	1,280	2,920	2,438
Europe | Aeronautics
Net sales
Net sales	847	678	1,645	1,186
Europe | MFC
Net sales
Net sales	103	46	225	115
Europe | RMS
Net sales
Net sales	143	224	341	379
Europe | Space
Net sales
Net sales	328	332	709	758
Middle East
Net sales
Net sales	863	808	1,904	1,623
Middle East | Aeronautics
Net sales
Net sales	335	320	672	577
Middle East | MFC
Net sales
Net sales	272	364	685	744
Middle East | RMS
Net sales
Net sales	247	143	532	314
Middle East | Space
Net sales
Net sales	9	(19)	15	(12)
Other
Net sales
Net sales	224	212	473	408
Other | Aeronautics
Net sales
Net sales	44	51	98	109
Other | MFC
Net sales
Net sales	14	7	27	14
Other | RMS
Net sales
Net sales	166	154	348	285
Other | Space
Net sales
Net sales	0	0	0	0
U.S. Government
Net sales
Net sales	10,383	9,624	20,362	17,703
U.S. Government | Aeronautics
Net sales
Net sales	3,476	3,444	6,911	6,209
U.S. Government | MFC
Net sales
Net sales	1,900	1,502	3,533	2,590
U.S. Government | RMS
Net sales
Net sales	2,675	2,608	5,350	4,964
U.S. Government | Space
Net sales
Net sales	2,332	2,070	4,568	3,940
International
Net sales
Net sales	3,819	3,543	7,974	6,911
International | Aeronautics
Net sales
Net sales	2,010	1,835	4,105	3,412
International | MFC
Net sales
Net sales	475	542	1,145	1,096
International | RMS
Net sales
Net sales	974	822	1,969	1,603
International | Space
Net sales
Net sales	360	344	755	800
U.S. commercial and other
Net sales
Net sales	225	231	427	419
U.S. commercial and other | Aeronautics
Net sales
Net sales	64	42	118	98
U.S. commercial and other | MFC
Net sales
Net sales	36	41	83	76
U.S. commercial and other | RMS
Net sales
Net sales	119	136	211	222
U.S. commercial and other | Space
Net sales
Net sales	6	12	15	23
Fixed-price
Net sales
Net sales	8,545	8,211	17,392	15,146
Fixed-price | Aeronautics
Net sales
Net sales	4,040	3,906	8,210	7,121
Fixed-price | MFC
Net sales
Net sales	1,444	1,395	2,979	2,507
Fixed-price | RMS
Net sales
Net sales	2,526	2,450	5,145	4,658
Fixed-price | Space
Net sales
Net sales	535	460	1,058	860
Cost-reimbursable
Net sales
Net sales	5,882	5,187	11,371	9,887
Cost-reimbursable | Aeronautics
Net sales
Net sales	1,510	1,415	2,924	2,598
Cost-reimbursable | MFC
Net sales
Net sales	967	690	1,782	1,255
Cost-reimbursable | RMS
Net sales
Net sales	1,242	1,116	2,385	2,131
Cost-reimbursable | Space
Net sales
Net sales	2,163	1,966	4,280	3,903
Products
Net sales
Net sales	12,003	11,150	23,973	20,912
Products | Aeronautics
Net sales
Net sales	4,740	4,511	9,536	8,281
Products | MFC
Net sales
Net sales	1,963	1,709	3,879	3,062
Products | RMS
Net sales
Net sales	3,023	2,904	6,082	5,621
Products | Space
Net sales
Net sales	2,277	2,026	4,476	3,948
Services
Net sales
Net sales	2,424	2,248	4,790	4,121
Services | Aeronautics
Net sales
Net sales	810	810	1,598	1,438
Services | MFC
Net sales
Net sales	448	376	882	700
Services | RMS
Net sales
Net sales	745	662	1,448	1,168
Services | Space
Net sales
Net sales	$ 421	$ 400	$ 862	$ 815