Proposed Merger with United Technologies Corporation (UTC) (Narrative) (Details) $ in Millions	Dec. 31, 2019 USD ($) shares
Business Combinations [Abstract]
Agreed Upon Number Shares of Common Stock of UTC which each share of Raytheon Common Stock will be Converted Into | shares	2.3348
Estimated percent of UTC's outstanding shares of common stock to be held by Raytheon stockholders	43.00%
Estimated percent of UTC's outstanding shares of common stock to be held by UTC stockholders	57.00%
Percent of the common stock of the entity holding the Otis business to be distributed to UTC stockholders after the separation	100.00%
Percent of the common stock of the entity holding the Carrier business to be distributed to UTC stockholders after the separation	100.00%
Maximum allowed incurrence or issuance of new debt under the Merger Agreement	$ 1,000
Maximum allowed acquisitions or divestitures in aggregate under the Merger Agreement	500
Termination fee payable to UTC by Raytheon under specified circumstances	1,785
Termination fee payable to Raytheon by UTC under specified circumstances	$ 2,365