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Cover - USD ($)
12 Months Ended
Dec. 31, 2020
Jan. 29, 2021
Jun. 30, 2020
Document Information [Line Items]      
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Central Index Key 0000101829    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 001-00812    
Entity Registrant Name RAYTHEON TECHNOLOGIES CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 06-0570975    
Entity Address, Address Line One 870 Winter Street    
Entity Address, City or Town Waltham    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02451    
City Area Code (781)    
Local Phone Number 522-3000    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 93,495,749,819
Entity Common Stock, Shares Outstanding   1,519,478,134  
Documents Incorporated by Reference Portions of the Registrant’s Definitive Proxy Statement for its 2021 Annual Meeting of Shareowners are incorporated by reference in Part II and III of this Form 10-K.    
Common Stock [Member]      
Document Information [Line Items]      
Title of 12(b) Security Common Stock ($1 par value)    
Trading Symbol RTX    
Security Exchange Name NYSE    
Notes 2.150% Due 2030 [Member]      
Document Information [Line Items]      
Title of 12(b) Security 2.150% Notes due 2030    
Trading Symbol RTX 30    
Security Exchange Name NYSE