Segment Financial Data (Segment Operating Performance) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 15,251	$ 11,360
Operating profit	$ 1,013	$ 1,295
Operating Profit Margin	6.60%	11.40%
Net expenses related to LTAMDS included in corporate operating income	$ 58	$ 0
Operating Segments
Segment Reporting Information [Line Items]
Revenues	15,958	11,791
Operating profit	$ 1,218	$ 1,721
Operating Profit Margin	7.60%	14.60%
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	$ (707)	$ (431)
Operating profit	(31)	(25)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Revenues	0	0
Operating profit	(81)	(130)
Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	4,370	6,438
Operating profit	$ 314	$ 1,246
Operating Profit Margin	7.20%	19.40%
Collins Aerospace Systems [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 4,038	$ 6,008
Collins Aerospace Systems [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	332	430
Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	4,030	5,353
Operating profit	$ 20	$ 475
Operating Profit Margin	0.50%	8.90%
Pratt & Whitney [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 4,030	$ 5,347
Pratt & Whitney [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	0	6
Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,765	0
Operating profit	$ 388	$ 0
Operating Profit Margin	10.30%	0.00%
Raytheon Intelligence & Space [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 3,445	$ 0
Raytheon Intelligence & Space [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	320	0
Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,793	0
Operating profit	$ 496	$ 0
Operating Profit Margin	13.10%	0.00%
Raytheon Missiles & Defense | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 3,730	$ 0
Raytheon Missiles & Defense | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	63	0
FAS/CAS Operating Adjustment | Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0	0
Operating profit	423	0
Acquisition accounting adjustment member | Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0	0
Operating profit	$ (516)	$ (271)