Segment Financial Data (Revised historical segment operating performance) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 14,747	$ 11,373	$ 40,168	$ 33,655
Operating Income (Loss)	434	1,430	(2,031)	3,958
Operating Segments
Segment Reporting Information [Line Items]
Revenues	15,236	11,780	41,620	34,841
Operating Income (Loss)	712	1,779	2,367	4,946
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(489)	(407)	(1,452)	(1,186)
Operating Income (Loss)	(51)	(46)	(104)	(115)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Operating Income (Loss)	(84)	(83)	(491)	(216)
Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	4,274	6,495	14,914	19,584
Operating Income (Loss)	526	1,259	1,455	3,499
Collins Aerospace Systems [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	3,963	6,084	13,864	18,386
Collins Aerospace Systems [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	311	411	1,050	1,198
Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	3,494	5,285	12,334	15,257
Operating Income (Loss)	(615)	520	(597)	1,447
Pratt & Whitney [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	3,491	5,286	12,328	15,260
Pratt & Whitney [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	3	(1)	6	(3)
Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,674	0	6,988	0
Operating Income (Loss)	348	0	659	0
Raytheon Intelligence & Space [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	3,379	0	6,387	0
Raytheon Intelligence & Space [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	295	0	601	0
Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,794	0	7,384	0
Operating Income (Loss)	453	0	850	0
Raytheon Missiles & Defense | Operating Segments
Segment Reporting Information [Line Items]
Revenues	3,735	0	7,261	0
Raytheon Missiles & Defense | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	$ 59	$ 0	$ 123	$ 0