Segment Financial Data (Revised historical 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 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
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
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
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
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
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