v3.25.2
Cover Page - shares
 6 Months Ended
Jun. 30, 2025
Jul. 29, 2025
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   283,695,342
Entity Central Index Key 0000093751  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
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 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