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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Jan. 31, 2024
Jun. 30, 2023
Entity Information [Line Items]      
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 001-07511    
Entity Registrant Name STATE STREET CORPORATION    
Entity Incorporation, State or Country Code MA    
Entity Tax Identification Number 04-2456637    
Entity Address, Address Line One One Congress Street    
Entity Address, City or Town Boston,    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02114    
City Area Code (617)    
Local Phone Number 786-3000    
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    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 23,520
Entity Common Stock, Shares Outstanding   301,943,571  
Documents Incorporated by Reference
Portions of the following documents are incorporated by reference into Parts of this Report on Form 10-K, to the extent noted in such Parts, as indicated below:
(1) The registrant’s definitive Proxy Statement for the 2024 Annual Meeting of Shareholders to be filed pursuant to Regulation 14A on or before April 29, 2024 (Part III).
    
Entity Central Index Key 0000093751    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Stock      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, $1 par value per share    
Trading Symbol STT    
Security Exchange Name NYSE    
Series D Preferred Stock, Depository Share      
Entity Information [Line Items]      
Title of 12(b) Security Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, without par value per share    
Trading Symbol STT.PRD    
Security Exchange Name NYSE    
Series G Preferred Stock, Depository Share      
Entity Information [Line Items]      
Title of 12(b) Security Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series G, without par value per share    
Trading Symbol STT.PRG    
Security Exchange Name NYSE