Segment Financial Data (Revised Segment Financial Results) (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended		12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 16,213	$ 16,419	$ 14,747	$ 14,061	$ 11,360	$ 47,344	$ 40,168	$ 56,587
Operating profit (loss)	$ 1,343	142	$ 434	(3,760)	1,295	$ 3,638	$ (2,031)	(1,889)
Operating Profit Margin	8.30%		2.90%			7.70%	(5.10%)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 16,959	16,956	$ 15,223	14,582	11,791	$ 49,532	$ 41,596	58,552
Operating profit (loss)	$ 1,546	$ 438	$ 710	$ (67)	$ 1,721	$ 4,329	$ 2,364	$ 2,802
Operating Profit Margin	9.10%	2.60%	4.70%	(0.50%)	14.60%	8.70%	5.70%	4.80%
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	$ (746)	$ (537)	$ (476)	$ (521)	$ (431)	$ (2,188)	$ (1,428)	$ (1,965)
Operating profit (loss)	(27)	(6)	(49)	(27)	(25)	(98)	(101)	(107)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Revenues	0		0			0	0
Operating profit (loss)	(89)	(99)	(84)	(277)	(130)	(319)	(491)	(590)
Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	4,592	4,374	4,274	4,202	6,438	13,507	14,914	19,288
Operating profit (loss)	$ 478	$ 11	$ 526	$ (317)	$ 1,246	$ 1,298	$ 1,455	$ 1,466
Operating Profit Margin	10.40%	0.30%	12.30%	(7.50%)	19.40%	9.60%	9.80%	7.60%
Collins Aerospace Systems [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 4,227		$ 3,963			$ 12,438	$ 13,864
Collins Aerospace Systems [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	365		311			1,069	1,050
Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	4,725	$ 4,465	3,494	$ 3,487	$ 5,353	13,035	12,334	$ 16,799
Operating profit (loss)	$ 187	$ 33	$ (615)	$ (457)	$ 475	$ 319	$ (597)	$ (564)
Operating Profit Margin	4.00%	0.70%	(17.60%)	(13.10%)	8.90%	2.40%	(4.80%)	(3.40%)
Pratt & Whitney [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 4,725		$ 3,491			$ 13,035	$ 12,328
Pratt & Whitney [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	0		3			0	6
Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,740	$ 3,933	3,749	$ 3,387	$ 0	11,310	7,136	$ 11,069
Operating profit (loss)	$ 391	$ 361	$ 350	$ 309	0	$ 1,194	$ 659	$ 1,020
Operating Profit Margin	10.50%	9.20%	9.30%	9.10%		10.60%	9.20%	9.20%
Raytheon Intelligence & Space [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 3,427		$ 3,466			$ 10,373	$ 6,557
Raytheon Intelligence & Space [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	313		283			937	579
Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,902	$ 4,184	3,706	$ 3,506	0	11,680	7,212	$ 11,396
Operating profit (loss)	$ 490	$ 33	$ 449	$ 398	0	$ 1,518	$ 847	$ 880
Operating Profit Margin	12.60%	0.80%	12.10%	11.40%		13.00%	11.70%	7.70%
Raytheon Missiles & Defense | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 3,835		$ 3,648			$ 11,483	$ 7,091
Raytheon Missiles & Defense | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	67		58			197	121
FAS/CAS Operating Adjustment | Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0		0			0	0
Operating profit (loss)	499	$ 370	380	$ 356	0	1,347	736	$ 1,106
Acquisition accounting adjustment member | Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0		0			0	0
Operating profit (loss)	$ (586)	$ (561)	$ (523)	$ (3,745)	$ (271)	$ (1,621)	$ (4,539)	$ (5,100)