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Cover Page - USD ($)
shares in Millions, $ in Billions
 12 Months Ended
Dec. 31, 2023
Jan. 26, 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 1-1023    
Entity Registrant Name S&P Global Inc.    
Entity Incorporation, State or Country Code NY    
Entity Tax Identification Number 13-1026995    
Entity Address, Address Line One 55 Water Street    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10041    
City Area Code 212    
Local Phone Number 438-1000    
Title of 12(b) Security Common Stock — $1 par value    
Trading Symbol SPGI    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
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 false    
Entity Shell Company false    
Entity Public Float     $ 127.5
Entity Common Stock, Share outstanding   314.1  
Documents Incorporated by Reference
Part III incorporates information by reference from the definitive proxy statement for the 2024 annual meeting of shareholders.
    
Entity Central Index Key 0000064040    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY