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Regulatory Capital (Tables)
 12 Months Ended
Dec. 31, 2021
Banking and Thrift, Other Disclosures [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 Corporation
State Street Bank
(Dollars in millions)Basel III Advanced Approaches December 31, 2021Basel III Standardized Approach December 31, 2021Basel III Advanced Approaches December 31, 2020Basel III Standardized Approach December 31, 2020Basel III Advanced Approaches December 31, 2021Basel III Standardized Approach December 31, 2021Basel III Advanced Approaches December 31, 2020Basel III Standardized Approach December 31, 2020
 Common shareholders' equity:
Common stock and related surplus$11,291 $11,291 $10,709 $10,709 $13,047 $13,047 $12,893 $12,893 
Retained earnings25,238 25,238 23,442 23,442 15,700 15,700 12,939 12,939 
Accumulated other comprehensive income (loss)(1,133)(1,133)187 187 (926)(926)371 371 
Treasury stock, at cost(10,009)(10,009)(10,609)(10,609)— — — — 
Total25,387 25,387 23,729 23,729 27,821 27,821 26,203 26,203 
Regulatory capital adjustments:
Goodwill and other intangible assets, net of associated deferred tax liabilities(8,935)(8,935)(9,019)(9,019)(8,667)(8,667)(8,745)(8,745)
Other adjustments(1)
(505)(505)(333)(333)(309)(309)(152)(152)
 Common equity tier 1 capital15,947 15,947 14,377 14,377 18,845 18,845 17,306 17,306 
Preferred stock1,976 1,976 2,471 2,471 — — — — 
 Tier 1 capital17,923 17,923 16,848 16,848 18,845 18,845 17,306 17,306 
Qualifying subordinated long-term debt1,588 1,588 961 961 752 752 966 966 
Allowance for credit losses— 108 1 148 — 108 10 148 
 Total capital$19,511 $19,619 $17,810 $17,957 $19,597 $19,705 $18,282 $18,420 
 Risk-weighted assets:
Credit risk(2)
$63,735 $109,554 $63,367 $114,892 $57,405 $106,405 $58,960 $110,797 
Operational risk(3)
45,550  NA44,150 NA42,813 NA43,663 NA
Market risk2,113 2,113 2,188 2,188 2,113 2,113 2,188 2,188 
Total risk-weighted assets$111,398 $111,667 $109,705 $117,080 $102,331 $108,518 $104,811 $112,985 
Adjusted quarterly average assets$293,567 $293,567 $263,490 $263,490 $290,403 $290,403 $260,489 $260,489 
Capital Ratios:
2021 Minimum Requirements(4)
2020 Minimum Requirements(4)
Common equity tier 1 capital8.0 %8.0 %14.3 %14.3 %13.1 %12.3 %18.4 %17.4 %16.5 %15.3 %
Tier 1 capital9.5 9.5 16.1 16.1 15.4 14.4 18.4 17.4 16.5 15.3 
Total capital11.5 11.5 17.5 17.6 16.2 15.3 19.2 18.2 17.4 16.3 
Tier 1 leverage(5)
4.0 4.0 6.1 6.1 6.4 6.4 6.5 6.5 6.6 6.6 
(1) Other adjustments within CET1 capital primarily include the overfunded portion of our defined benefit pension plan obligation net of associated deferred tax liabilities, disallowed deferred tax assets, and other required credit risk based deductions.
(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 (OTC) 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%.
(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