Segment Financial Data (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 14,747	$ 11,373	$ 40,168	$ 33,655
Product [Member]
Segment Reporting Information [Line Items]
Revenues	11,469	8,211	30,402	24,635
Service [Member]
Segment Reporting Information [Line Items]
Revenues	3,278	3,162	9,766	9,020
U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	7,747	2,313	17,603	6,777
Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	1,372	399	3,040	1,091
Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	1,186	315	2,653	1,082
Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	4,442	8,346	16,872	24,705
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	9,566	5,532	24,224	15,952
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	1,703	2,096	5,462	5,752
Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	1,055	380	2,441	1,144
Europe [Member]
Segment Reporting Information [Line Items]
Revenues	2,012	2,614	6,532	8,467
Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	411	751	1,509	2,340
Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	4,274	6,495	14,914	19,584
Collins Aerospace Systems [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenues	3,231	4,973	11,325	15,105
Collins Aerospace Systems [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	732	1,111	2,539	3,281
Collins Aerospace Systems [Member] | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	1,238	1,222	3,880	3,534
Collins Aerospace Systems [Member] | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	34	64	166	190
Collins Aerospace Systems [Member] | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	230	217	659	700
Collins Aerospace Systems [Member] | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	2,461	4,581	9,159	13,962
Collins Aerospace Systems [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,378	3,269	8,027	9,590
Collins Aerospace Systems [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	358	644	1,350	1,822
Collins Aerospace Systems [Member] | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	97	168	339	536
Collins Aerospace Systems [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	965	1,661	3,497	5,341
Collins Aerospace Systems [Member] | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	165	342	651	1,097
Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	3,494	5,285	12,334	15,257
Pratt & Whitney [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenues	2,142	3,235	7,285	9,521
Pratt & Whitney [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	1,349	2,051	5,043	5,739
Pratt & Whitney [Member] | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	1,270	1,091	3,792	3,243
Pratt & Whitney [Member] | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	325	335	877	901
Pratt & Whitney [Member] | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	120	98	380	382
Pratt & Whitney [Member] | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	1,776	3,762	7,279	10,734
Pratt & Whitney [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	1,856	2,260	6,103	6,353
Pratt & Whitney [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	772	1,452	2,980	3,930
Pratt & Whitney [Member] | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	112	212	406	608
Pratt & Whitney [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	572	953	2,101	3,126
Pratt & Whitney [Member] | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	179	409	738	1,243
Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,674	0	6,988	0
Raytheon Intelligence & Space [Member] | Fixed-price Contract
Segment Reporting Information [Line Items]
Revenues	1,443		2,646
Raytheon Intelligence & Space [Member] | Time-and-materials Contract
Segment Reporting Information [Line Items]
Revenues	1,936		3,741
Raytheon Intelligence & Space [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenues	2,534	0	4,867	0
Raytheon Intelligence & Space [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	845	0	1,520	0
Raytheon Intelligence & Space [Member] | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	2,879	0	5,376	0
Raytheon Intelligence & Space [Member] | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	185	0	387	0
Raytheon Intelligence & Space [Member] | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	240	0	449	0
Raytheon Intelligence & Space [Member] | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	75	0	175	0
Raytheon Intelligence & Space [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,933	0	5,498	0
Raytheon Intelligence & Space [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	195	0	390	0
Raytheon Intelligence & Space [Member] | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	122	0	244	0
Raytheon Intelligence & Space [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	100	0	202	0
Raytheon Intelligence & Space [Member] | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	29	0	53	0
Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,794	0	7,384	0
Raytheon Missiles & Defense | Fixed-price Contract
Segment Reporting Information [Line Items]
Revenues	2,404		4,582
Raytheon Missiles & Defense | Time-and-materials Contract
Segment Reporting Information [Line Items]
Revenues	1,331		2,679
Raytheon Missiles & Defense | Product [Member]
Segment Reporting Information [Line Items]
Revenues	3,405	0	6,637	0
Raytheon Missiles & Defense | Service [Member]
Segment Reporting Information [Line Items]
Revenues	330	0	624	0
Raytheon Missiles & Defense | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	2,288	0	4,429	0
Raytheon Missiles & Defense | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	828	0	1,610	0
Raytheon Missiles & Defense | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	594	0	1,163	0
Raytheon Missiles & Defense | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	25	0	59	0
Raytheon Missiles & Defense | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,290	0	4,440	0
Raytheon Missiles & Defense | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	365	0	716	0
Raytheon Missiles & Defense | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	714	0	1,434	0
Raytheon Missiles & Defense | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	337	0	628	0
Raytheon Missiles & Defense | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	29	0	43	0
Other Segments
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Other Segments | Product [Member]
Segment Reporting Information [Line Items]
Revenues	157	3	288	9
Other Segments | Service [Member]
Segment Reporting Information [Line Items]
Revenues	22	0	40	0
Other Segments | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	72	0	126	0
Other Segments | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Other Segments | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	2	0	2	0
Other Segments | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	105	3	200	9
Other Segments | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	109	3	156	9
Other Segments | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	13	0	26	0
Other Segments | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	10	0	18	0
Other Segments | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	38	0	104	0
Other Segments | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	9	0	24	0
Operating Segments
Segment Reporting Information [Line Items]
Revenues	15,236	11,780	41,620	34,841
Operating Segments | Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	3,963	6,084	13,864	18,386
Operating Segments | Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	3,491	5,286	12,328	15,260
Operating Segments | Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,379	0	6,387	0
Operating Segments | Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,735	0	7,261	0
Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Revenues	179	3	328	9
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(489)	(407)	(1,452)	(1,186)
Intersegment Eliminations | Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	311	411	1,050	1,198
Intersegment Eliminations | Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	3	(1)	6	(3)
Intersegment Eliminations | Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	295	0	601	0
Intersegment Eliminations | Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	59	0	123	0
Intersegment Eliminations | Other Segments
Segment Reporting Information [Line Items]
Revenues	$ (668)	$ (410)	$ (1,780)	$ (1,195)