Business Combinations (Details) - USD ($) $ in Millions		1 Months Ended					3 Months Ended			12 Months Ended
	Apr. 03, 2020	Dec. 31, 2021	Nov. 30, 2021	Jan. 31, 2021	Dec. 31, 2020	May 31, 2020	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Acquisition Cost Of Acquired Entities and Interest in Affiliates										$ 66	$ 1,100	$ 35,100
Payments to Acquire Businesses, Net of Cash Acquired			$ 1,100
Goodwill, Acquired During Period			800							31
Finite-lived Intangible Assets Acquired			$ 300
Defined benefit plan, benefit obligation, (increase) decrease due to remeasurement	$ 2,400
Customer Contractual Obligation		$ 929								818	929
Proceeds from Divestiture of Businesses and Interests in Affiliates		900								94	1,879	2,556
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		251
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, After Tax		135
Disposal Group, Not Discontinued Operation, Gain (Loss) on Non-Service Pension (Income) Expense		$ 12
Goodwill, Impairment Loss									$ 3,200	0	0	3,183
Amortization of Intangible Assets										1,957	2,439	2,125
Collins Aerospace Military Global Positioning System G P S And Space Based Precision Optics Businesses [Member]
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses and Interests in Affiliates								$ 2,300
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal								580
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, After Tax								253
Costs related to the divestitures required for regulatory approval								20
Collins Aerospace Military Global Positioning System G P S And Space Based Precision Optics Businesses [Member] | Other Income (Expense) [Member]
Business Acquisition [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal								608
Collins Aerospace Military Global Positioning System G P S And Space Based Precision Optics Businesses [Member] | Nonoperating Income (Expense)
Business Acquisition [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal								$ 8
Airborne tactical radios business [Member]
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses and Interests in Affiliates						$ 231
Gain on disposal recorded as an adjustment to fair value of net asset acquired						$ 199
Forcepoint [Member]
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses and Interests in Affiliates				$ 1,100
Collins Aerospace Systems [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period										$ (36)
Goodwill, Impairment Loss									$ 3,200			3,200
Impairment of Intangible Assets (Excluding Goodwill)												57
Raytheon Company [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period	$ 21,600
Agreed Upon Number Shares of Common Stock of UTC which each share of Raytheon Common Stock will be Converted Into	2.3348
Goodwill, Purchase Accounting Adjustments							$ 61
Fair value adjustments to fixed assets	$ 1,100
Fair value adjustment to future pension and postretirement benefit obligations	3,600
Customer Contractual Obligation	$ 222
Business Combination, Acquisition Related Costs											$ 17	$ 142
Blue Canyon [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired					$ 425
Goodwill, Acquired During Period					281
Finite-lived Intangible Assets Acquired					$ 149