Segment Financial Data (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 Profit Margin	2.90%	12.60%	(5.10%)	11.80%
Net expenses related to LTAMDS included in corporate operating income	$ 45		$ 80
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
Operating Profit Margin	4.70%	15.10%	5.70%	14.20%
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
Operating Profit Margin	12.30%	19.40%	9.80%	17.90%
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
Operating Profit Margin	(17.60%)	9.80%	(4.80%)	9.50%
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
Operating Profit Margin	9.50%	0.00%	9.40%	0.00%
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
Operating Profit Margin	11.90%	0.00%	11.50%	0.00%
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
Acquisition accounting adjustment member | Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Operating Income (Loss)	(523)	(220)	(4,539)	(657)
FAS/CAS Operating Adjustment | Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Operating Income (Loss)	$ 380	$ 0	$ 736	$ 0