v3.25.3
Regulatory Capital (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Retained earnings $ 30,938 $ 29,582
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 $ 11,208 $ 11,226
Retained earnings 30,938 29,582
Accumulated other comprehensive income (loss) (1,172) (2,100)
Treasury stock, at cost (16,891) (16,198)
Total 24,083 22,510
Goodwill and other intangible assets, net of associated deferred tax liabilities (8,401) (8,320)
Other adjustments (526) (391)
Common equity tier 1 capital 15,156 13,799
Preferred stock 3,559 2,816
Tier 1 capital 18,715 16,615
Qualifying subordinated long-term debt 1,876 1,861
Allowance for credit losses 17 0
Total capital 20,608 18,476
Credit risk 62,768 63,252
Operational risk 51,063 49,350
Market risk 1,900 2,000
Total risk-weighted assets 115,731 114,602
Adjusted quarterly average assets $ 331,553 $ 318,470
Common equity tier 1 capital 13.10% 12.00%
Tier 1 capital 0.162 0.145
Total capital 0.178 0.161
Tier 1 leverage capital ratio, actual 0.056 0.052
Basel III Standardized Approach    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common stock and related surplus $ 11,208 $ 11,226
Retained earnings 30,938 29,582
Accumulated other comprehensive income (loss) (1,172) (2,100)
Treasury stock, at cost (16,891) (16,198)
Total 24,083 22,510
Goodwill and other intangible assets, net of associated deferred tax liabilities (8,401) (8,320)
Other adjustments (526) (391)
Common equity tier 1 capital 15,156 13,799
Preferred stock 3,559 2,816
Tier 1 capital 18,715 16,615
Qualifying subordinated long-term debt 1,876 1,861
Allowance for credit losses 201 183
Total capital 20,792 18,659
Credit risk 132,268 124,281
Market risk 1,900 2,000
Total risk-weighted assets 134,168 126,281
Adjusted quarterly average assets $ 331,553 $ 318,470
Common equity tier 1 capital 11.30% 10.90%
Tier 1 capital 0.139 0.132
Total capital 0.155 0.148
Tier 1 leverage capital ratio, actual 0.056 0.052
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 16,509 15,977
Accumulated other comprehensive income (loss) (946) (1,805)
Treasury stock, at cost 0 0
Total 28,896 27,505
Goodwill and other intangible assets, net of associated deferred tax liabilities (8,128) (8,054)
Other adjustments (416) (278)
Common equity tier 1 capital 20,352 19,173
Preferred stock 0 0
Tier 1 capital 20,352 19,173
Qualifying subordinated long-term debt 526 530
Allowance for credit losses 18 0
Total capital 20,896 19,703
Credit risk 58,880 57,883
Operational risk 49,438 47,538
Market risk 1,900 2,000
Total risk-weighted assets 110,218 107,421
Adjusted quarterly average assets $ 327,014 $ 314,754
Common equity tier 1 capital 18.50% 17.80%
Tier 1 capital 0.185 0.178
Total capital 0.190 0.183
Tier 1 leverage capital ratio, actual 0.062 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 16,509 15,977
Accumulated other comprehensive income (loss) (946) (1,805)
Treasury stock, at cost 0 0
Total 28,896 27,505
Goodwill and other intangible assets, net of associated deferred tax liabilities (8,128) (8,054)
Other adjustments (416) (278)
Common equity tier 1 capital 20,352 19,173
Preferred stock 0 0
Tier 1 capital 20,352 19,173
Qualifying subordinated long-term debt 526 530
Allowance for credit losses 201 183
Total capital 21,079 19,886
Credit risk 129,216 121,785
Market risk 1,900 2,000
Total risk-weighted assets 131,116 123,785
Adjusted quarterly average assets $ 327,014 $ 314,754
Common equity tier 1 capital 15.50% 15.50%
Tier 1 capital 0.155 0.155
Total capital 0.161 0.161
Tier 1 leverage capital ratio, actual 0.062 0.061