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Basis of Presentation and Summary of Accounting Principles (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Apr. 03, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basis of Presentation [Line Items]
Net pre-tax restructuring costs (benefit)			$ 777
Goodwill impairment		$ 3,200	3,183	$ 0	$ 0
Estimated credit losses			387
Asset Impairment Charges			111	0	0
Restricted Cash And Cash Equivalents			30	24
Unbilled			20,336	5,211
Contractual Obligation			1,243	1,408
Contract with Customer, Performance Obligation Satisfied in Previous Period			(407)	(106)	72
Capitalized Contract Cost, Net			$ 1,981	1,519
Collaborators interests existing programs low end			13.00%
Collaborators interests existing programs high end			49.00%
Partner share individual program maximum			31.00%
Revenue, Remaining Performance Obligation, Amount			$ 150,100
Revenue, Remaining Performance Obligations, to be recognized within 12 months			30.00%
Retained earnings			$ 49,423	61,594
Contractual Obligation, Consumed in Current Year			295	345	$ 252
Contractual Obligation, Due in Next Fiscal Year			223
Contractual Obligation, Due in Second Year			119
Contractual Obligation, Due in Third Year			96
Contractual Obligation, Due in Fourth Year			115
Contractual Obligation, Due in Fifth Year			130
Contractual Obligation, Due after Fifth Year			560
Accounts Receivable [Member]
Basis of Presentation [Line Items]
Unbilled			228	$ 265
Cumulative Effect, Period of Adoption, Adjustment [Member] \| Accounting Standards Update 2016-13 [Member]
Basis of Presentation [Line Items]
Retained earnings			59
Carrier [Member]
Basis of Presentation [Line Items]
Shares of common stock distributed in the Distribution	866,158,910
Otis [Member]
Basis of Presentation [Line Items]
Shares of common stock distributed in the Distribution	433,079,455
Collins Aerospace Systems [Member]
Basis of Presentation [Line Items]
Net pre-tax restructuring costs (benefit)			360
Goodwill impairment		$ 3,200	3,183
Contract asset and inventory write-offs			146
Collins Aerospace Systems [Member] \| Patents & trademarks [Member]
Basis of Presentation [Line Items]
Asset Impairment Charges			57
Pratt and Whitney [Member]
Basis of Presentation [Line Items]
Net pre-tax restructuring costs (benefit)			183
Goodwill impairment			0
Unfavorable EAC adjustment on a commercial engine aftermarket contract			334
Unfavorable EAC adjustment related to the restructuring of a customer contract			129
Asset Impairment Charges			89
Unfavorable EAC adjustments on commercial aftermarket contracts			75
Unfavorable EAC adjustment related to military contracts			44
Reserves relating to a commercial financing arrangement			$ 43