Acquisition, Dispositions, Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill [Line Items]
Goodwill - Beginning Balance				$ 36,609
Goodwill Resulting from Business Combinations				19,903
Goodwill impairment	$ 0		$ 0	(3,183)	$ 0
Goodwill - Foreign Currency Translation and Other				195
Goodwill - Ending Balance	53,524			53,524
Collins Aerospace Systems [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance				35,025
Goodwill Resulting from Business Combinations				(890)
Goodwill impairment		$ (3,200)		(3,183)
Goodwill - Foreign Currency Translation and Other				190
Goodwill - Ending Balance	31,142			31,142
Fair Value in Excess of Net Book Value, Amount	$ 1,400			$ 1,400
Fair Value in Excess of Net Book Value, Percent	19.00%			19.00%
Goodwill impairment impact of 25bps increase in discount rate	$ 1,200			$ 1,200
Goodwill impairment impact of 25bps decrease in discount rate	1,300			1,300
Goodwill impairment impact of 10% decrease in cash flows	2,500			2,500
Goodwill impairment impact of 10% increase in cash flows	(2,100)			(2,100)
Pratt & Whitney [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance				1,563
Goodwill Resulting from Business Combinations				0
Goodwill impairment				0
Goodwill - Foreign Currency Translation and Other				0
Goodwill - Ending Balance	1,563			1,563
Raytheon Intelligence & Space [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance				0
Goodwill Resulting from Business Combinations				8,781
Goodwill impairment				0
Goodwill - Foreign Currency Translation and Other				2
Goodwill - Ending Balance	8,783			8,783
Raytheon Missiles & Defense
Goodwill [Line Items]
Goodwill - Beginning Balance				0
Goodwill Resulting from Business Combinations				11,540
Goodwill impairment				0
Goodwill - Foreign Currency Translation and Other				2
Goodwill - Ending Balance	11,542			11,542
Total Segments [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance				36,588
Goodwill Resulting from Business Combinations				19,431
Goodwill impairment				(3,183)
Goodwill - Foreign Currency Translation and Other				194
Goodwill - Ending Balance	53,030			53,030
Eliminations and other [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance				21
Goodwill Resulting from Business Combinations				472
Goodwill impairment				0
Goodwill - Foreign Currency Translation and Other				1
Goodwill - Ending Balance	$ 494			$ 494