Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Pro Forma) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
		Mar. 31, 2020		Mar. 31, 2019
Otis and Carrier
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Acquisition, Pro Forma Net Income		$ 25,301		$ 25,035
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax		$ 709		$ 1,942
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic		$ 0.47		$ 1.29
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Diluted		$ 0.47		$ 1.28
Pro Forma Nonrecurring Adjustment, related to Otis and Carrier Separation		$ 949	[1]	$ (634)
Raytheon Company [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Acquisition, Pro Forma Net Income		18,451		17,623
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax		$ 1,760		$ 1,599
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic		$ 1.17		$ 1.06
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Diluted		$ 1.16		$ 1.06
Pro Forma Nonrecurring Adjustment, RTC/Raytheon fees for advisory, legal, accounting services	[2]	$ 34		$ 0
Pro Forma Nonrecurring Adjustment, Deferred revenue fair value adjustment	[3]	(4)		(9)
Pro Forma Nonrecurring Adjustment, Interest expense related to debt distributions and Raytheon Merger, net	[4]	106		131
Pro Forma Nonrecurring Adjustment, Elimination of deferred commission amortization	[5]	5		3
Pro Forma Nonrecurring Adjustments, Net		$ 1,055		$ (529)

[1] Reflects the impact of the Separation Transactions and Distributions.

[2] Reflects the elimination of transaction-related fees incurred by RTC and Raytheon Company in connection with the Raytheon Merger and assumes all of the fees were incurred during the first quarter of 2019

[3] Reflects the difference between prepayments related to extended arrangements and the preliminary fair value of the assumed performance obligations as they are satisfied.

[4] Reflects a reduction in interest expense as result of RTC's paydown of debt to meet its targeted indebtedness, in connection with the Raytheon Merger.

[5] Reflects the elimination of amortization recognized on deferred commissions that are eliminated in purchase accounting.