Account rollover limit EBP, Involuntary Rollover Limit EBP, Involuntary Rollover Limit Statistical Measurement [Domain] Statistical Measurement [Domain] Transactions and Agreements with Parties-in-Interest EBP, Related Party and Party-in-Interest Transactions [Text Block] Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Document Information [Line Items] Document Information [Line Items] Maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Contributions EBP, Contribution [Policy Text Block] EBP, Description of Plan and Accounting Change [Abstract] Rollovers EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Investment Type [Axis] Investment Type [Axis] Maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Number of Shares/Units (in shares) EBP, Investment, Number of Shares Income Tax Status EBP, Tax Status [Text Block] EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Interest and dividend income EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] *Notes Receivable - Participant Loans EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Account cash-out limit EBP, Involuntary Cash-out Limit EBP, Involuntary Cash-out Limit Fair Value Measurement EBP, Investment, Fair Value and NAV [Text Block] Maximum ESOP account percentage EBP, Participant Contribution, Investment Limitation, Maximum Percentage Of Account Balance EBP, Participant Contribution, Investment Limitation, Maximum Percentage Of Account Balance EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Minimum borrowing, amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Administrative expenses payable EBP, Accrued Expense EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Vanguard Prime Money Market Fund Money Market Fund Money Market Funds [Member] EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] Benefits paid EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Primary residence borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term Vesting percentage EBP, Employer Contribution Vesting Percentage Company contribution and/ or investment earning percentage vesting to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions, upon completion of minimum service period or attainment of maximum vesting age Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Payment of Benefits EBP, Payment to Participant [Policy Text Block] Net assets available for benefits Net assets available for benefits at beginning of year Net assets available for benefits at end of year EBP, Net Asset Available for Benefit EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Total assets at fair value EBP, Asset EBP 002 EBP 002 [Member] EBP 002 Retirement-eligible installment payments, years of service EBP, Retirement Installment Payment, Years Of Service EBP, Retirement Installment Payment, Years Of Service Vesting period EBP, Employer Contribution Vesting Service Period Minimum Vesting service period for company contribution and/ or investment earning to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions. Automatic deferral rate EBP, Participant Contribution, Automatic, Deferral Rate State Street Corporation Common Stock Company Stock EBP, Employer, Common Stock [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Tax Status [Abstract] Net increase EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Cover [Abstract] Maximum Maximum [Member] Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] Assets EBP, Asset [Abstract] General loan borrowing term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term Maximum tax-deferred contributions and/or Roth after-tax contributions EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Minimum Minimum [Member] Common stock dividends received EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment EBP, Schedule of Asset Held for Investment [Abstract] Entity [Domain] Entity [Domain] Investment, Identifier [Axis] Investment, Identifier [Axis] EBP, Investment, Fair Value and NAV [Abstract] State Street Short Term Investment Fund EBP, Common Collective Trust, Short-Term Investment Funds [Member] EBP, Common Collective Trust, Short-Term Investment Funds Matching percentage EBP, Employer Contribution, Matching Percentage Basis of Accounting EBP, Basis of Accounting [Policy Text Block] Primary residence variable rate EBP, Note Receivable From Participant, Account, Primary Residence, Basis Spread on Variable Rate EBP, Note Receivable From Participant, Account, Primary Residence, Basis Spread on Variable Rate EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Investments at fair value: EBP, Investment, Fair Value [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] State Street Common and Collective Trust Funds EBP, Common Collective Trust, Excluding Short-Term Investment Funds [Member] EBP, Common Collective Trust, Excluding Short-Term Investment Funds EBP, Description of Plan [Table] EBP, Description of Plan [Table] Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] Interest / dividends receivable Dividends receivable EBP, Investment Income, Receivable Amendment Flag Amendment Flag Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Common and Collective Trust Funds Common Collective Trust [Member] Schedule of Assets Measured at Fair Value EBP, Investment, Fair Value and NAV [Table Text Block] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Total Investments EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Statement of Change in Net Asset Available for Benefit [Abstract] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Statement of Net Asset Available for Benefit [Abstract] Description of the Plan EBP, Description of Plan [Text Block] Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] Notes Receivable - Participant Loans EBP, Note Receivable from Participant [Policy Text Block] Total additions, including net investment income EBP, Change in Net Asset Available for Benefit, Increase EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items] Entity Central Index Key Entity Central Index Key Participant loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate Total investments at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Legal Entity [Axis] Legal Entity [Axis] Entity tax identification number Entity Tax Identification Number Net investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Plan number EBP, Plan Number Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Automatic increase EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate Annual increase in percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) until the contribution reaches maximum threshold. Use of Estimates EBP, Use of Estimate [Policy Text Block] Statistical Measurement [Axis] Statistical Measurement [Axis] Deductions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Retirement-eligible installment payments, retirement age EBP, Retirement Installment Payment, Minimum Age At Retirement EBP, Retirement Installment Payment, Minimum Age At Retirement Notes receivable - participant loans EBP, Note Receivable from Participant Level 2 Fair Value, Inputs, Level 2 [Member] Schedule H, Line 4i – Schedule of Assets (Held At End of Year) EBP, Schedule of Asset Held for Investment [Table Text Block] Additions EBP, Change in Net Asset Available for Benefit, Increase [Abstract] Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Investments [Domain] Investments [Domain] General loan variable rate EBP, Note Receivable From Participant, General Loan, Interest Rate, Basis Spread on Variable Rate EBP, Note Receivable From Participant, General Loan, Interest Rate, Basis Spread on Variable Rate Self-Managed Brokerage Accounts Self-Managed Brokerage Accounts EBP, Self-Directed Brokerage Account [Member] Document Information [Table] Document Information [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Risk and Uncertainty [Abstract] Level 1 Fair Value, Inputs, Level 1 [Member] Entity Registrant Name Entity Registrant Name Minimum annual compensation to total compensation, percentagetax-deferred contributions and/or Roth after-tax contributions EBP, Participant Contribution, Minimum Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, Minimum Contribution to Eligible Compensation, Percentage EBP, Tax Status [Table] EBP, Tax Status [Table] Liabilities EBP, Liability [Abstract] Employee’s contributions matching percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage Risks and Uncertainties EBP, Risk and Uncertainty [Text Block]