Earnings Per Share (EPS) (EPS from Continuing Operations) (Details) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic EPS attributable to Raytheon Company common stockholders:
Distributed earnings									$ 3.76	$ 3.46	$ 3.18
Undistributed earnings									8.17	6.70	3.77
Total	$ 3.17	$ 3.08	$ 2.92	$ 2.77	$ 2.93	$ 2.25	$ 2.78	$ 2.20	11.93	10.16	6.95
Diluted EPS attributable to Raytheon Company common stockholders:
Distributed earnings									3.76	3.45	3.18
Undistributed earnings									8.16	6.70	3.76
Total	$ 3.16	$ 3.08	$ 2.92	$ 2.77	$ 2.93	$ 2.25	$ 2.78	$ 2.20	$ 11.92	$ 10.15	$ 6.94