Business Combinations (Raytheon Merger Proforma Information) (Details) - Raytheon Company [Member] $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue	$ 64,087
Business Acquisition, Pro Forma Net Income (Loss)	$ (2,167)
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic | $ / shares	$ (1.43)
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Diluted | $ / shares	$ (1.43)
Pro Forma Nonrecurring Adjustment, Amortization of acquired Raytheon Company intangible assets, net	$ (270)
Pro Forma Nonrecurring Adjustment, Amortization of inventory and fixed asset fair value adjustment	(9)
Pro Forma Nonrecurring Adjustment, Utilization of contractual customer obligation	8
Pro Forma Nonrecurring Adjustment, Deferred revenue fair value adjustment	(4)
Pro Forma Nonrecurring Adjustment, Adjustment to net periodic pension cost	239
Pro Forma Nonrecurring Adjustment, RTC/Raytheon fees for advisory, legal, accounting services	134
Pro Forma Nonrecurring Adjustment, Interest expense related to debt distributions and Raytheon Merger, net	9
Pro Forma Nonrecurring Adjustment, Elimination of deferred commission amortization	5
Pro Forma Nonrecurring Adjustments, Net	$ 112