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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 08, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-40392    
Entity Registrant Name DT Midstream, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 38-2663964    
Entity Address, Address Line One 500 Woodward Ave., Suite 2900    
Entity Address, City or Town Detroit    
Entity Address, State or Province MI    
Entity Address, Postal Zip Code 48226-1279    
City Area Code 313    
Local Phone Number 402-8532    
Title of 12(b) Security Common stock, par value $0.01    
Trading Symbol DTM    
Security Exchange Name NYSE    
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    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 4.8
Entity Common Stock, Shares Outstanding   96,979,556  
Documents Incorporated by Reference Certain information in DT Midstream's definitive Proxy Statement for our 2024 Annual Meeting of Common Shareholders to be held May 10, 2024, which will be filed with the Securities and Exchange Commission pursuant to Regulation 14A, not later than 120 days after the end of the registrant’s fiscal year covered by this report on Form 10-K, is incorporated herein by reference to Part III (Items 10, 11, 12, 13, and 14) of this Form 10-K.    
Entity Central Index Key 0001842022    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false