Segment Financial Data (Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 16,419	$ 14,747	$ 14,061	$ 11,360	$ 11,694	$ 11,373	$ 11,329	$ 10,953	$ 56,587	$ 45,349	$ 34,701
Operating Income (Loss)									$ (1,889)	$ 4,914	$ 2,877
Operating Profit Margin									(3.30%)	10.80%	8.30%
Net expenses related to LTAMDS included in corporate operating income									$ 130	$ 0	$ 0
Goodwill impairment			3,200						3,183	0	0
Total Assets	162,153				139,615				162,153	139,615
Capital Expenditures									1,795	1,868	1,467
Depreciation & Amortization									4,156	2,708	1,896
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total Assets	64				31,823				64	31,823
Operating Segments
Segment Reporting Information [Line Items]
Net sales									58,588	46,930	36,036
Operating Income (Loss)									$ 2,806	$ 6,309	$ 3,799
Operating Profit Margin									4.80%	13.40%	10.50%
Total Assets	152,391				105,219				$ 152,391	$ 105,219
Capital Expenditures									1,701	1,781	$ 1,381
Depreciation & Amortization									1,847	1,309	970
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									(2,001)	(1,581)	(1,335)
Operating Income (Loss)									(111)	(140)	(69)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Net sales									0	0	0
Operating Income (Loss)									(590)	(367)	(340)
Total Assets	9,698				2,573				9,698	2,573
Capital Expenditures									94	87	86
Depreciation & Amortization									155	165	161
Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Net sales									19,288	26,028	16,634
Operating Income (Loss)									$ 1,466	$ 4,508	$ 2,397
Operating Profit Margin									7.60%	17.30%	14.40%
Goodwill impairment			$ 3,200						$ 3,183
Total Assets	68,701				74,049				68,701	$ 74,049
Capital Expenditures									638	959	$ 515
Depreciation & Amortization									736	695	396
Collins Aerospace Systems [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net sales									17,910	24,431	15,285
Collins Aerospace Systems [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									1,378	1,597	1,349
Pratt and Whitney [Member]
Segment Reporting Information [Line Items]
Net sales									16,799	20,902	19,402
Operating Income (Loss)									$ (564)	$ 1,801	$ 1,402
Operating Profit Margin									(3.40%)	8.60%	7.20%
Goodwill impairment									$ 0
Total Assets	32,780				31,170				32,780	$ 31,170
Capital Expenditures									565	822	$ 866
Depreciation & Amortization									729	614	574
Pratt and Whitney [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net sales									16,790	20,905	19,404
Pratt and Whitney [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									9	(3)	(2)
Raytheon Intelligence & Space
Segment Reporting Information [Line Items]
Net sales									10,841	0	0
Operating Income (Loss)									$ 1,014	$ 0	$ 0
Operating Profit Margin									9.40%	0.00%	0.00%
Goodwill impairment									$ 0
Total Assets	20,911				0				20,911	$ 0
Capital Expenditures									214	0	$ 0
Depreciation & Amortization									152	0	0
Raytheon Intelligence & Space | Operating Segments
Segment Reporting Information [Line Items]
Net sales									9,879	0	0
Raytheon Intelligence & Space | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									962	0	0
Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Net sales									11,660	0	0
Operating Income (Loss)									$ 890	$ 0	$ 0
Operating Profit Margin									7.60%	0.00%	0.00%
Goodwill impairment									$ 0
Total Assets	$ 29,999				$ 0				29,999	$ 0
Capital Expenditures									284	0	$ 0
Depreciation & Amortization									230	0	0
Raytheon Missiles & Defense | Operating Segments
Segment Reporting Information [Line Items]
Net sales									11,481	0	0
Raytheon Missiles & Defense | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									179	0	0
FAS/CAS Operating Adjustment
Segment Reporting Information [Line Items]
Net sales									0	0	0
Operating Income (Loss)									1,106	0	0
Acquisition Accounting Adjustments
Segment Reporting Information [Line Items]
Net sales									0	0	0
Operating Income (Loss)									(5,100)	(888)	(513)
Depreciation & Amortization									$ 2,154	$ 1,234	$ 765