Segment Financial Data (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended		12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 15,880	$ 16,419	$ 14,747	$ 14,061	$ 11,360	$ 31,131	$ 25,421	$ 56,587
Product [Member]
Segment Reporting Information [Line Items]
Revenues	12,179			10,768		23,843	18,932
Service [Member]
Segment Reporting Information [Line Items]
Revenues	3,701			3,293		7,288	6,489
U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	7,670			7,328		15,418	9,856
Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	1,497			1,342		2,792	1,668
Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	1,313			1,104		2,493	1,467
Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	5,400			4,287		10,428	12,430
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	9,871			9,161		19,601	14,658
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	2,002			1,734		3,774	3,759
Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	1,167			1,071		2,159	1,386
Europe [Member]
Segment Reporting Information [Line Items]
Revenues	2,316			1,758		4,463	4,520
Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	524			337		1,134	1,098
Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	4,545	4,374	4,274	4,202	6,438	8,915	10,640	19,288
Collins Aerospace Systems [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenues	3,349			3,190		6,531	8,094
Collins Aerospace Systems [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	824			703		1,680	1,807
Collins Aerospace Systems [Member] | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	1,147			1,353		2,369	2,642
Collins Aerospace Systems [Member] | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	25			77		65	132
Collins Aerospace Systems [Member] | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	301			204		546	429
Collins Aerospace Systems [Member] | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	2,700			2,259		5,231	6,698
Collins Aerospace Systems [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,323			2,505		4,565	5,649
Collins Aerospace Systems [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	470			388		875	992
Collins Aerospace Systems [Member] | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	115			99		210	242
Collins Aerospace Systems [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	1,062			787		2,141	2,532
Collins Aerospace Systems [Member] | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	203			114		420	486
Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	4,280	4,465	3,494	3,487	5,353	8,310	8,840	16,799
Pratt & Whitney [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenues	2,582			1,888		5,005	5,143
Pratt & Whitney [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	1,698			1,602		3,305	3,694
Pratt & Whitney [Member] | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	1,191			1,283		2,453	2,522
Pratt & Whitney [Member] | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	397			281		639	552
Pratt & Whitney [Member] | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	127			122		266	260
Pratt & Whitney [Member] | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	2,565			1,804		4,952	5,503
Pratt & Whitney [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,139			1,892		4,298	4,247
Pratt & Whitney [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	971			787		1,764	2,208
Pratt & Whitney [Member] | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	85			122		189	294
Pratt & Whitney [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	807			512		1,433	1,529
Pratt & Whitney [Member] | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	278			177		626	559
Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,805	3,933	3,749	3,387	0	7,570	3,387	11,069
Raytheon Intelligence & Space [Member] | Fixed-price Contract
Segment Reporting Information [Line Items]
Revenues	1,556			1,271		3,027	1,271
Raytheon Intelligence & Space [Member] | Cost-type Contract
Segment Reporting Information [Line Items]
Revenues	1,945			1,820		3,919	1,820
Raytheon Intelligence & Space [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenues	2,675			2,409		5,351	2,409
Raytheon Intelligence & Space [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	826			682		1,595	682
Raytheon Intelligence & Space [Member] | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	2,944			2,560		5,844	2,560
Raytheon Intelligence & Space [Member] | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	209			218		417	218
Raytheon Intelligence & Space [Member] | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	217			213		446	213
Raytheon Intelligence & Space [Member] | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	131			100		239	100
Raytheon Intelligence & Space [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	3,020			2,628		5,985	2,628
Raytheon Intelligence & Space [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	205			200		409	200
Raytheon Intelligence & Space [Member] | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	132			137		265	137
Raytheon Intelligence & Space [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	118			102		232	102
Raytheon Intelligence & Space [Member] | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	26			24		55	24
Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,985	4,184	3,706	3,506	0	7,778	3,506	11,396
Raytheon Missiles & Defense | Fixed-price Contract
Segment Reporting Information [Line Items]
Revenues	2,402			2,110		4,653	2,110
Raytheon Missiles & Defense | Cost-type Contract
Segment Reporting Information [Line Items]
Revenues	1,516			1,333		2,995	1,333
Raytheon Missiles & Defense | Product [Member]
Segment Reporting Information [Line Items]
Revenues	3,565			3,156		6,940	3,156
Raytheon Missiles & Defense | Service [Member]
Segment Reporting Information [Line Items]
Revenues	353			287		708	287
Raytheon Missiles & Defense | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	2,384			2,078		4,741	2,078
Raytheon Missiles & Defense | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	866			766		1,671	766
Raytheon Missiles & Defense | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	668			565		1,235	565
Raytheon Missiles & Defense | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	0			34		1	34
Raytheon Missiles & Defense | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,385			2,087		4,742	2,087
Raytheon Missiles & Defense | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	356			346		726	346
Raytheon Missiles & Defense | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	835			705		1,495	705
Raytheon Missiles & Defense | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	325			291		652	291
Raytheon Missiles & Defense | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	17			14		33	14
Other Segments
Segment Reporting Information [Line Items]
Revenues	0			0		0	0
Other Segments | Product [Member]
Segment Reporting Information [Line Items]
Revenues	8			125		16	130
Other Segments | Service [Member]
Segment Reporting Information [Line Items]
Revenues	0			19		0	19
Other Segments | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	4			54		11	54
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			0		0	0
Other Segments | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	4			90		5	95
Other Segments | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	4			49		11	47
Other Segments | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	0			13		0	13
Other Segments | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	0			8		0	8
Other Segments | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	4			66		5	66
Other Segments | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	0			8		0	15
Operating Segments
Segment Reporting Information [Line Items]
Revenues	16,615	16,956	15,223	14,582	11,791	32,573	26,373	58,552
Operating Segments | Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	4,173			3,893		8,211	9,901
Operating Segments | Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	4,280			3,490		8,310	8,837
Operating Segments | Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,501			3,091		6,946	3,091
Operating Segments | Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,918			3,443		7,648	3,443
Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Revenues	8			144		16	149
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(735)	$ (537)	$ (476)	(521)	$ (431)	(1,442)	(952)	$ (1,965)
Intersegment Eliminations | Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	372			309		704	739
Intersegment Eliminations | Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	0			(3)		0	3
Intersegment Eliminations | Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	304			296		624	296
Intersegment Eliminations | Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	67			63		130	63
Intersegment Eliminations | Other Segments
Segment Reporting Information [Line Items]
Revenues	$ (743)			$ (665)		$ (1,458)	$ (1,101)