v3.26.1
Regulatory Capital (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Retained earnings $ 32,660 $ 31,392
Capital ratio: required common equity tier 1 capital 8.00% 8.00%
Capital ratio: required tier 1 capital 0.095 0.095
Capital ratio: required total capital 0.115 0.115
Tier 1 leverage capital ratio, minimum 0.040 0.040
Leverage ratio minimum 0.05  
Basel III Advanced Approaches    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common stock and related surplus $ 11,214 $ 11,209
Retained earnings 32,660 31,392
Accumulated other comprehensive income (loss) (1,178) (1,043)
Treasury stock, at cost (17,987) (17,276)
Total 24,709 24,282
Goodwill and other intangible assets, net of associated deferred tax liabilities (8,764) (8,921)
Other adjustments (520) (549)
Common equity tier 1 capital 15,425 14,812
Preferred stock 3,559 3,559
Tier 1 capital 18,984 18,371
Qualifying subordinated long-term debt 1,691 1,872
Adjusted allowance for credit losses 22 18
Total capital 20,697 20,261
Credit risk 66,805 60,594
Operational risk 46,950 51,638
Market risk 2,738 2,125
Total risk-weighted assets 116,493 114,357
Adjusted quarterly average assets $ 357,537 $ 332,978
Common equity tier 1 capital 13.20% 13.00%
Tier 1 capital 0.163 0.161
Total capital 0.178 0.177
Tier 1 leverage capital ratio, actual 0.053 0.055
Basel III Standardized Approach    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common stock and related surplus $ 11,214 $ 11,209
Retained earnings 32,660 31,392
Accumulated other comprehensive income (loss) (1,178) (1,043)
Treasury stock, at cost (17,987) (17,276)
Total 24,709 24,282
Goodwill and other intangible assets, net of associated deferred tax liabilities (8,764) (8,921)
Other adjustments (520) (549)
Common equity tier 1 capital 15,425 14,812
Preferred stock 3,559 3,559
Tier 1 capital 18,984 18,371
Qualifying subordinated long-term debt 1,691 1,872
Adjusted allowance for credit losses 175 203
Total capital 20,850 20,446
Credit risk 140,668 125,138
Market risk 2,738 2,125
Total risk-weighted assets 143,406 127,263
Adjusted quarterly average assets $ 357,537 $ 332,978
Common equity tier 1 capital 10.80% 11.60%
Tier 1 capital 0.132 0.144
Total capital 0.145 0.161
Tier 1 leverage capital ratio, actual 0.053 0.055
State Street Bank | Basel III Advanced Approaches    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common stock and related surplus $ 13,333 $ 13,333
Retained earnings 16,773 16,401
Accumulated other comprehensive income (loss) (934) (815)
Treasury stock, at cost 0 0
Total 29,172 28,919
Goodwill and other intangible assets, net of associated deferred tax liabilities (8,168) (8,342)
Other adjustments (381) (419)
Common equity tier 1 capital 20,623 20,158
Preferred stock 0 0
Tier 1 capital 20,623 20,158
Qualifying subordinated long-term debt 521 524
Adjusted allowance for credit losses 23 18
Total capital 21,167 20,700
Credit risk 62,446 56,438
Operational risk 46,575 50,025
Market risk 2,738 2,125
Total risk-weighted assets 111,759 108,588
Adjusted quarterly average assets $ 352,636 $ 328,034
Common equity tier 1 capital 18.50% 18.60%
Tier 1 capital 0.185 0.186
Total capital 0.189 0.191
Tier 1 leverage capital ratio, actual 0.058 0.061
State Street Bank | Basel III Standardized Approach    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common stock and related surplus $ 13,333 $ 13,333
Retained earnings 16,773 16,401
Accumulated other comprehensive income (loss) (934) (815)
Treasury stock, at cost 0 0
Total 29,172 28,919
Goodwill and other intangible assets, net of associated deferred tax liabilities (8,168) (8,342)
Other adjustments (381) (419)
Common equity tier 1 capital 20,623 20,158
Preferred stock 0 0
Tier 1 capital 20,623 20,158
Qualifying subordinated long-term debt 521 524
Adjusted allowance for credit losses 175 203
Total capital 21,319 20,885
Credit risk 137,393 121,747
Market risk 2,738 2,125
Total risk-weighted assets 140,131 123,872
Adjusted quarterly average assets $ 352,636 $ 328,034
Common equity tier 1 capital 14.70% 16.30%
Tier 1 capital 0.147 0.163
Total capital 0.152 0.169
Tier 1 leverage capital ratio, actual 0.058 0.061