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Regulatory Capital (Tables)
 9 Months Ended
Sep. 30, 2024
Banking and Thrift, Other Disclosure [Abstract]  
Schedule of Regulatory Capital
The following table presents the regulatory capital structure, total RWA, related regulatory capital ratios and the minimum required regulatory capital ratios for us and State Street Bank as of the dates indicated.
State Street CorporationState Street Bank
(Dollars in millions)Basel III Advanced Approaches September 30, 2024Basel III Standardized Approach September 30, 2024Basel III Advanced Approaches December 31, 2023Basel III Standardized Approach December 31, 2023Basel III Advanced Approaches September 30, 2024Basel III Standardized Approach September 30, 2024Basel III Advanced Approaches December 31, 2023Basel III Standardized Approach December 31, 2023
 Common shareholders' equity:
Common stock and related surplus$11,227 $11,227 $11,245 $11,245 $13,333 $13,333 $13,033 $13,033 
Retained earnings29,073 29,073 27,957 27,957 15,373 15,373 14,454 14,454 
Accumulated other comprehensive income (loss)(1,625)(1,625)(2,354)(2,354)(1,390)(1,390)(2,097)(2,097)
Treasury stock, at cost(15,663)(15,663)(15,025)(15,025)— — — — 
Total23,012 23,012 21,823 21,823 27,316 27,316 25,390 25,390 
Regulatory capital adjustments:
Goodwill and other intangible assets, net of associated deferred tax liabilities(8,531)(8,531)(8,470)(8,470)(8,258)(8,258)(8,208)(8,208)
Other adjustments(1)
(410)(410)(382)(382)(302)(302)(298)(298)
 Common equity tier 1 capital14,071 14,071 12,971 12,971 18,756 18,756 16,884 16,884 
Preferred stock2,816 2,816 1,976 1,976 — — — — 
 Tier 1 capital16,887 16,887 14,947 14,947 18,756 18,756 16,884 16,884 
Qualifying subordinated long-term debt1,867 1,867 1,870 1,870 532 532 536 536 
Allowance for credit losses— 171 — 150 1 171 — 150 
 Total capital$18,754 $18,925 $16,817 $16,967 $19,289 $19,459 $17,420 $17,570 
 Risk-weighted assets:
Credit risk(2)
$61,857 $118,987 $61,210 $109,228 $56,595 $116,847 $54,942 $107,067 
Operational risk(3)
48,788  NA43,768 NA46,863  NA42,297 NA
Market risk2,150 2,150 2,475 2,475 2,150 2,150 2,475 2,475 
Total risk-weighted assets$112,795 $121,137 $107,453 $111,703 $105,608 $118,997 $99,714 $109,542 
Adjusted quarterly average assets$305,699 $305,699 $269,807 $269,807 $302,212 $302,212 $266,818 $266,818 
Capital Ratios:
2024 Minimum Requirements(4)
2023 Minimum Requirements(4)
Common equity tier 1 capital8.0 %8.0 %12.5 %11.6 %12.1 %11.6 %17.8 %15.8 %16.9 %15.4 %
Tier 1 capital9.5 9.5 15.0 13.9 13.9 13.4 17.8 15.8 16.9 15.4 
Total capital11.5 11.5 16.6 15.6 15.7 15.2 18.3 16.4 17.5 16.0 
Tier 1 leverage(5)
4.0 4.0 5.5 5.5 5.5 5.5 6.2 6.2 6.3 6.3 
(1) Other adjustments within CET1 capital primarily include disallowed deferred tax assets, cash flow hedges that are not recognized at fair value on the balance sheet, and the overfunded portion of our defined benefit pension plan obligation net of associated deferred tax liabilities.
(2) Under the advanced approaches, credit risk RWA includes a CVA which reflects the risk of potential fair value adjustments for credit risk reflected in our valuation of over-the-counter derivative contracts. We used a simple CVA approach in conformity with the Basel III advanced approaches.
(3) Under the current advanced approaches rules and regulatory guidance concerning operational risk models, RWA attributable to operational risk can vary substantially from period-to-period, without direct correlation to the effects of a particular loss event on our results of operations and financial condition and impacting dates and periods that may differ from the dates and periods as of and during which the loss event is reflected in our financial statements, with the timing and categorization dependent on the processes for model updates and, if applicable, model revalidation and regulatory review and related supervisory processes. An individual loss event can have a significant effect on the output of our operational RWA under the advanced approaches depending on the severity of the loss event and its categorization among the seven Basel-defined UOMs.
(4) Minimum requirements include a CCB of 2.5% and a SCB of 2.5% for the advanced approaches and the standardized approach, respectively, a G-SIB surcharge of 1.0% and a countercyclical buffer of 0%. On June 26, 2024, we were notified by the Federal Reserve of the results from the 2024 supervisory stress test. Our SCB calculated under the 2024 supervisory stress test was well below the 2.5% minimum, resulting in an SCB at that floor, which will continue to remain in effect from October 1, 2024, through September 30, 2025.
(5) State Street Bank is required to maintain a minimum Tier 1 leverage ratio of 5% as it is the insured depository institution subsidiary of State Street Corporation, a U.S. G-SIB.
NA Not applicable