Segment Financial Data (Segment Operating Performance) (Details) - USD ($) $ in Millions	3 Months Ended						6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 14,061	$ 11,360	$ 11,694	$ 11,373	$ 11,329	$ 10,953	$ 25,421	$ 22,282	$ 45,349
Operating Income (Loss)	$ (3,760)	1,295	956	1,430	$ 1,386	1,142	$ (2,465)	$ 2,528	4,914
Operating Profit Margin	(26.70%)				12.20%		(9.70%)	11.30%
Net expenses related to LTAMDS included in corporate operating income	$ 35						$ 35
Operating Segments
Segment Reporting Information [Line Items]
Revenues	14,593	11,791	12,089	11,780	$ 11,730	11,331	26,384	$ 23,061	46,930
Operating Income (Loss)	$ (66)	1,721	1,363	1,779	$ 1,725	1,442	$ 1,655	$ 3,167	6,309
Operating Profit Margin	(0.50%)				14.70%		6.30%	13.70%
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	$ (532)	(431)	(395)	(407)	$ (401)	(378)	$ (963)	$ (779)	(1,581)
Operating Income (Loss)	(28)	(25)	(25)	(46)	(42)	(27)	(53)	(69)	(140)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Revenues	0				0		0	0
Operating Income (Loss)	(277)	(130)	(151)	(83)	(87)	(46)	(407)	(133)	(367)
Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	4,202	6,438	6,444	6,495	6,576	6,513	10,640	13,089	26,028
Operating Income (Loss)	$ (317)	1,246	1,009	1,259	$ 1,276	964	$ 929	$ 2,240	4,508
Operating Profit Margin	(7.50%)				19.40%		8.70%	17.10%
Collins Aerospace Systems [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 3,893				$ 6,174		$ 9,901	$ 12,302
Collins Aerospace Systems [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	309				402		739	787
Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	3,487	5,353	5,645	5,285	5,154	4,818	8,840	9,972	20,902
Operating Income (Loss)	$ (457)	475	354	520	$ 449	478	$ 18	$ 927	1,801
Operating Profit Margin	(13.10%)				8.70%		0.20%	9.30%
Pratt & Whitney [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 3,490				$ 5,153		$ 8,837	$ 9,974
Pratt & Whitney [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(3)				1		3	(2)
Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,314	0	0	0	0	0	3,314	0	0
Operating Income (Loss)	$ 311	0	0	0	$ 0	0	$ 311	$ 0	0
Operating Profit Margin	9.40%				0.00%		9.40%	0.00%
Raytheon Intelligence & Space [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 3,008				$ 0		$ 3,008	$ 0
Raytheon Intelligence & Space [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	306				0		306	0
Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,590	0	0	0	0	0	3,590	0	0
Operating Income (Loss)	$ 397	0	0	0	$ 0	0	$ 397	$ 0	0
Operating Profit Margin	11.10%				0.00%		11.10%	0.00%
Raytheon Missiles & Defense | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 3,526				$ 0		$ 3,526	$ 0
Raytheon Missiles & Defense | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	64				0		64	0
Acquisition accounting adjustment member | Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0				0		0	0
Operating Income (Loss)	(3,745)	(271)	(231)	(220)	(210)	(227)	(4,016)	(437)	(888)
FAS/CAS Operating Adjustment | Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0				0		0	0
Operating Income (Loss)	$ 356	$ 0	$ 0	$ 0	$ 0	$ 0	$ 356	$ 0	$ 0