| Document and Entity Information | Nov. 20, 2024 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | STATE STREET CORP |
| Amendment Flag | false |
| Entity Central Index Key | 0000093751 |
| Document Type | 8-K |
| Document Period End Date | Nov. 20, 2024 |
| Entity Incorporation State Country Code | MA |
| Entity File Number | 001-07511 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common stock, $1 par value per share |
| Trading Symbol | STT |
| Security Exchange Name | NYSE |
| Series G Preferred Stock Depository Share [Member] | |
| Document And Entity Information [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 |
