v3.26.1
Schedule H, Line 4i – Schedule of Assets (Held At End of Year) (Details) - EBP 002
 12 Months Ended
Dec. 31, 2025
USD ($)
shares
EBP, Schedule of Asset Held for Investment [Line Items]  
Entity tax identification number 04-2456637
Plan number 002
Total Investments $ 7,399,813,922
*Notes Receivable - Participant Loans 45,876,094
Self-Managed Brokerage Accounts  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total Investments $ 652,527,264
Minimum  
EBP, Schedule of Asset Held for Investment [Line Items]  
Participant loan, interest rate 4.25%
Maximum  
EBP, Schedule of Asset Held for Investment [Line Items]  
Participant loan, interest rate 9.75%
Investment, Identifier [Axis]: State Street Corporation Common Stock | State Street Corporation ESOP Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 1,459,282
Total Investments $ 188,261,971
Investment, Identifier [Axis]: State Street Emerging Markets Index Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 9,609,816
Total Investments $ 158,292,889
Investment, Identifier [Axis]: State Street Russell Small/Mid Cap Index Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 6,500,061
Total Investments $ 755,112,030
Investment, Identifier [Axis]: State Street S&P 500 Index Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 1,282,237
Total Investments $ 2,410,242,133
Investment, Identifier [Axis]: State Street Short Term Investment Fund | State Street Corporation ESOP Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 1,347,661
Total Investments $ 1,347,661
Investment, Identifier [Axis]: State Street Target Retirement 2025 Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 4,137,537
Total Investments $ 156,014,106
Investment, Identifier [Axis]: State Street Target Retirement 2030 Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 7,288,456
Total Investments $ 338,745,550
Investment, Identifier [Axis]: State Street Target Retirement 2035 Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 9,903,640
Total Investments $ 423,697,544
Investment, Identifier [Axis]: State Street Target Retirement 2040 Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 7,515,285
Total Investments $ 389,306,788
Investment, Identifier [Axis]: State Street Target Retirement 2045 Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 7,363,700
Total Investments $ 348,295,663
Investment, Identifier [Axis]: State Street Target Retirement 2050 Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 6,879,884
Total Investments $ 270,964,245
Investment, Identifier [Axis]: State Street Target Retirement 2055 Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 3,313,702
Total Investments $ 130,480,317
Investment, Identifier [Axis]: State Street Target Retirement 2060 Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 2,080,553
Total Investments $ 54,995,270
Investment, Identifier [Axis]: State Street Target Retirement 2065 Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 915,954
Total Investments $ 20,784,835
Investment, Identifier [Axis]: State Street Target Retirement 2070 Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 96,594
Total Investments $ 1,135,657
Investment, Identifier [Axis]: State Street Target Retirement Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 2,902,209
Total Investments $ 83,200,537
Investment, Identifier [Axis]: State Street U.S. Bond Index Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 7,782,340
Total Investments $ 246,139,847
Investment, Identifier [Axis]: State Street World Developed ex US Index Securities Lending Series Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 21,580,010
Total Investments $ 427,456,835
Investment, Identifier [Axis]: State Street World Government Bond Ex-U.S. Index Non-Lending Fund | State Street Common and Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 1,850,767
Total Investments $ 18,231,904
Investment, Identifier [Axis]: Vanguard Prime Money Market Fund | Self Managed Brokerage Accounts  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 324,581,201
Total Investments $ 324,580,876