| Document and Entity Information | Aug. 14, 2024 |
| Class of Stock [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 14, 2024 |
| Entity Registrant Name | STATE STREET CORP |
| Entity Incorporation State Country Code | MA |
| Entity File Number | 001-07511 |
| Entity Tax Identification Number | 04-2456637 |
| Entity Address Address Line 1 | 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0000093751 |
| Common Stock [Member] | |
| Class of Stock [Line Items] | |
| Security 12b Title | Common stock, $1 par value per share |
| Trading Symbol | STT |
| Security Exchange Name | NYSE |
| Depositary Shares, each representing a 1/4,000th ownership interest in a share of Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series G, without par value per share [Member] | |
| Class of Stock [Line Items] | |
| Security 12b Title | Depositary Shares, each representing a 1/4,000th ownership interest in a share of Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock |
| Trading Symbol | STT.PRG |
| Security Exchange Name | NYSE |
