Segment Financial Data (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended		12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 16,213	$ 16,419	$ 14,747	$ 14,061	$ 11,360	$ 47,344	$ 40,168	$ 56,587
Product [Member]
Segment Reporting Information [Line Items]
Revenues	12,331		11,469			36,174	30,402
Service [Member]
Segment Reporting Information [Line Items]
Revenues	3,882		3,278			11,170	9,766
U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	7,737		7,747			23,155	17,603
Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	1,364		1,372			4,156	3,040
Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	1,242		1,186			3,735	2,653
Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	5,870		4,442			16,298	16,872
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	10,096		9,566			29,697	24,224
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	2,006		1,703			5,780	5,462
Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	1,140		1,055			3,299	2,441
Europe [Member]
Segment Reporting Information [Line Items]
Revenues	2,408		2,012			6,871	6,532
Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	563		411			1,697	1,509
Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	4,592	4,374	4,274	4,202	6,438	13,507	14,914	19,288
Collins Aerospace Systems [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenues	3,336		3,231			9,867	11,325
Collins Aerospace Systems [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	891		732			2,571	2,539
Collins Aerospace Systems [Member] | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	1,101		1,238			3,470	3,880
Collins Aerospace Systems [Member] | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	54		34			119	166
Collins Aerospace Systems [Member] | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	258		230			804	659
Collins Aerospace Systems [Member] | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	2,814		2,461			8,045	9,159
Collins Aerospace Systems [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,334		2,378			6,899	8,027
Collins Aerospace Systems [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	465		358			1,340	1,350
Collins Aerospace Systems [Member] | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	136		97			346	339
Collins Aerospace Systems [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	1,066		965			3,207	3,497
Collins Aerospace Systems [Member] | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	226		165			646	651
Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	4,725	4,465	3,494	3,487	5,353	13,035	12,334	16,799
Pratt & Whitney [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenues	2,877		2,142			7,882	7,285
Pratt & Whitney [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	1,848		1,349			5,153	5,043
Pratt & Whitney [Member] | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	1,295		1,270			3,748	3,792
Pratt & Whitney [Member] | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	322		325			961	877
Pratt & Whitney [Member] | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	126		120			392	380
Pratt & Whitney [Member] | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	2,982		1,776			7,934	7,279
Pratt & Whitney [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,367		1,856			6,665	6,103
Pratt & Whitney [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	1,007		772			2,771	2,980
Pratt & Whitney [Member] | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	127		112			316	406
Pratt & Whitney [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	943		572			2,376	2,101
Pratt & Whitney [Member] | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	281		179			907	738
Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,740	3,933	3,749	3,387	0	11,310	7,136	11,069
Raytheon Intelligence & Space [Member] | Fixed-price Contract
Segment Reporting Information [Line Items]
Revenues	1,506		1,510			4,533	2,781
Raytheon Intelligence & Space [Member] | Cost-type Contract
Segment Reporting Information [Line Items]
Revenues	1,921		1,956			5,840	3,776
Raytheon Intelligence & Space [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenues	2,613		2,615			7,964	5,024
Raytheon Intelligence & Space [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	814		851			2,409	1,533
Raytheon Intelligence & Space [Member] | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	2,923		2,944			8,767	5,504
Raytheon Intelligence & Space [Member] | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	210		201			627	419
Raytheon Intelligence & Space [Member] | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	216		245			662	458
Raytheon Intelligence & Space [Member] | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	78		76			317	176
Raytheon Intelligence & Space [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,977		2,999			8,962	5,627
Raytheon Intelligence & Space [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	199		205			608	405
Raytheon Intelligence & Space [Member] | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	105		133			370	270
Raytheon Intelligence & Space [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	107		100			339	202
Raytheon Intelligence & Space [Member] | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	39		29			94	53
Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,902	4,184	3,706	3,506	0	11,680	7,212	11,396
Raytheon Missiles & Defense | Fixed-price Contract
Segment Reporting Information [Line Items]
Revenues	2,401		2,337			7,054	4,447
Raytheon Missiles & Defense | Cost-type Contract
Segment Reporting Information [Line Items]
Revenues	1,434		1,311			4,429	2,644
Raytheon Missiles & Defense | Product [Member]
Segment Reporting Information [Line Items]
Revenues	3,506		3,324			10,446	6,480
Raytheon Missiles & Defense | Service [Member]
Segment Reporting Information [Line Items]
Revenues	329		324			1,037	611
Raytheon Missiles & Defense | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	2,414		2,223			7,155	4,301
Raytheon Missiles & Defense | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	778		812			2,449	1,578
Raytheon Missiles & Defense | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	642		589			1,877	1,154
Raytheon Missiles & Defense | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	1		24			2	58
Raytheon Missiles & Defense | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,414		2,224			7,156	4,311
Raytheon Missiles & Defense | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	335		355			1,061	701
Raytheon Missiles & Defense | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	772		703			2,267	1,408
Raytheon Missiles & Defense | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	297		337			949	628
Raytheon Missiles & Defense | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	17		29			50	43
Other Segments
Segment Reporting Information [Line Items]
Revenues	0		0			0	0
Other Segments | Product [Member]
Segment Reporting Information [Line Items]
Revenues	(1)		157			15	288
Other Segments | Service [Member]
Segment Reporting Information [Line Items]
Revenues	0		22			0	40
Other Segments | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	4		72			15	126
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	0		2			0	2
Other Segments | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	(5)		105			0	200
Other Segments | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	4		109			15	156
Other Segments | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	0		13			0	26
Other Segments | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	0		10			0	18
Other Segments | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	(5)		38			0	104
Other Segments | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	0		9			0	24
Operating Segments
Segment Reporting Information [Line Items]
Revenues	16,959	16,956	15,223	14,582	11,791	49,532	41,596	58,552
Operating Segments | Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	4,227		3,963			12,438	13,864
Operating Segments | Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	4,725		3,491			13,035	12,328
Operating Segments | Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,427		3,466			10,373	6,557
Operating Segments | Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,835		3,648			11,483	7,091
Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Revenues	(1)		179			15	328
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(746)	$ (537)	(476)	$ (521)	$ (431)	(2,188)	(1,428)	$ (1,965)
Intersegment Eliminations | Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	365		311			1,069	1,050
Intersegment Eliminations | Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	0		3			0	6
Intersegment Eliminations | Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	313		283			937	579
Intersegment Eliminations | Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	67		58			197	121
Intersegment Eliminations | Other Segments
Segment Reporting Information [Line Items]
Revenues	$ (745)		$ (655)			$ (2,203)	$ (1,756)