Business Combinations (Raytheon Merger Proforma Information) (Details) - Raytheon Company [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue	$ 64,087	$ 74,238
Business Acquisition, Pro Forma Net Income (Loss)	$ (2,167)	$ 6,544
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic	$ (1.43)	$ 4.34
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Diluted	$ (1.43)	$ 4.31
Pro Forma Nonrecurring Adjustment, Amortization of acquired Raytheon Company intangible assets, net	$ (270)	$ (1,048)
Pro Forma Nonrecurring Adjustment, Amortization of inventory and fixed asset fair value adjustment	(9)	(38)
Pro Forma Nonrecurring Adjustment, Utilization of contractual customer obligation	8	57
Pro Forma Nonrecurring Adjustment, Deferred revenue fair value adjustment	(4)	(33)
Pro Forma Nonrecurring Adjustment, Adjustment to net periodic pension cost	239	832
Pro Forma Nonrecurring Adjustment, RTC/Raytheon fees for advisory, legal, accounting services	134	(134)
Pro Forma Nonrecurring Adjustment, Interest expense related to debt distributions and Raytheon Merger, net	9	36
Pro Forma Nonrecurring Adjustment, Elimination of deferred commission amortization	5	20
Pro Forma Nonrecurring Adjustments, Net	$ 112	$ (308)