Segment Financial Data (Revised Segment Financial Results) (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended		12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 15,880	$ 16,419	$ 14,747	$ 14,061	$ 11,360	$ 31,131	$ 25,421	$ 56,587
Operating profit (loss)	$ 1,282	142	434	$ (3,760)	1,295	$ 2,295	$ (2,465)	(1,889)
Operating Profit Margin	8.10%			(26.70%)		7.40%	(9.70%)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 16,615	16,956	15,223	$ 14,582	11,791	$ 32,573	$ 26,373	58,552
Operating profit (loss)	$ 1,565	$ 438	$ 710	$ (67)	$ 1,721	$ 2,783	$ 1,654	$ 2,802
Operating Profit Margin	9.40%	2.60%	4.70%	(0.50%)	14.60%	8.50%	6.30%	4.80%
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	$ (735)	$ (537)	$ (476)	$ (521)	$ (431)	$ (1,442)	$ (952)	$ (1,965)
Operating profit (loss)	(40)	(6)	(49)	(27)	(25)	(71)	(52)	(107)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Revenues	0			0		0	0
Operating profit (loss)	(149)	(99)	(84)	(277)	(130)	(230)	(407)	(590)
Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	4,545	4,374	4,274	4,202	6,438	8,915	10,640	19,288
Operating profit (loss)	$ 506	$ 11	$ 526	$ (317)	$ 1,246	$ 820	$ 929	$ 1,466
Operating Profit Margin	11.10%	0.30%	12.30%	(7.50%)	19.40%	9.20%	8.70%	7.60%
Collins Aerospace Systems [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 4,173			$ 3,893		$ 8,211	$ 9,901
Collins Aerospace Systems [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	372			309		704	739
Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	4,280	$ 4,465	$ 3,494	3,487	$ 5,353	8,310	8,840	$ 16,799
Operating profit (loss)	$ 112	$ 33	$ (615)	$ (457)	$ 475	$ 132	$ 18	$ (564)
Operating Profit Margin	2.60%	0.70%	(17.60%)	(13.10%)	8.90%	1.60%	0.20%	(3.40%)
Pratt & Whitney [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 4,280			$ 3,490		$ 8,310	$ 8,837
Pratt & Whitney [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	0			(3)		0	3
Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,805	$ 3,933	$ 3,749	3,387	$ 0	7,570	3,387	$ 11,069
Operating profit (loss)	$ 415	$ 361	$ 350	$ 309	0	$ 803	$ 309	$ 1,020
Operating Profit Margin	10.90%	9.20%	9.30%	9.10%		10.60%	9.10%	9.20%
Raytheon Intelligence & Space [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 3,501			$ 3,091		$ 6,946	$ 3,091
Raytheon Intelligence & Space [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	304			296		624	296
Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,985	$ 4,184	$ 3,706	3,506	0	7,778	3,506	$ 11,396
Operating profit (loss)	$ 532	$ 33	$ 449	$ 398	0	$ 1,028	$ 398	$ 880
Operating Profit Margin	13.40%	0.80%	12.10%	11.40%		13.20%	11.40%	7.70%
Raytheon Missiles & Defense | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 3,918			$ 3,443		$ 7,648	$ 3,443
Raytheon Missiles & Defense | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	67			63		130	63
FAS/CAS Operating Adjustment | Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0			0		0	0
Operating profit (loss)	425	$ 370	$ 380	356	0	848	356	$ 1,106
Acquisition accounting adjustment member | Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0			0		0	0
Operating profit (loss)	$ (519)	$ (561)	$ (523)	$ (3,745)	$ (271)	$ (1,035)	$ (4,016)	$ (5,100)