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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Jan. 30, 2026
Jun. 30, 2025
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
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     $ 30,310
Entity Common Stock, Shares Outstanding   278,728,211  
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 2026 Annual Meeting of Shareholders to be filed pursuant to Regulation 14A on or before April 30, 2026 (Part III).
    
Entity Central Index Key 0000093751    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Stock, $1 par value per share      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, $1 par value per share    
Trading Symbol STT    
Security Exchange Name NYSE    
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series G, without par value per 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