State Street (STT) 10-Q 22 Oct 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Oct. 20, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-07511
Entity Registrant Name	STATE STREET CORPORATION
Entity Incorporation, State or Country Code	MA
Entity Tax Identification Number	04-2456637
Entity Address, Address Line One	One Lincoln Street
Entity Address, City or Town	Boston,
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02111
City Area Code	(617)
Local Phone Number	786-3000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		365,629,173
Amendment Flag	false
Entity Central Index Key	0000093751
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, $1 par value per share
Trading Symbol	STT
Security Exchange Name	NYSE
Series D Preferred Stock, Depository Share
Entity Information [Line Items]
Title of 12(b) Security	Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, without par value per share
Trading Symbol	STT.PRD
Security Exchange Name	NYSE
Series G Preferred Stock, Depository Share
Entity Information [Line Items]
Title of 12(b) Security	Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series G, without par value per share
Trading Symbol	STT.PRG
Security Exchange Name	NYSE

Consolidated Statement of Incom

Consolidated Statement of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fee revenue:
Servicing fees	$ 1,395	$ 1,301	$ 4,165	$ 3,860
Management fees	526	479	1,523	1,387
Foreign exchange trading services	279	270	911	1,039
Securities finance	106	84	314	268
Software and processing fees	198	172	588	529
Total fee revenue	2,504	2,306	7,501	7,083
Net interest income:
Interest income	487	520	1,425	2,062
Interest expense	0	42	4	361
Net interest income	487	478	1,421	1,701
Other income:
Gains (losses) from sales of available-for-sale securities, net	(1)	0	(1)	2
Other income	0	0	53	0
Total other income (loss)	(1)	0	52	2
Total revenue	2,990	2,784	8,974	8,786
Provision for credit losses	(2)	0	(26)	88
Expenses:
Compensation and employee benefits	1,054	1,062	3,373	3,321
Information systems and communications	406	395	1,225	1,156
Transaction processing services	253	234	786	721
Occupancy	102	109	311	327
Acquisition and restructuring costs	18	15	39	38
Amortization of other intangible assets	62	59	183	175
Other	221	229	642	702
Total expenses	2,116	2,103	6,559	6,440
Income before income tax expense	876	681	2,441	2,258
Income tax expense	162	126	445	375
Net income	714	555	1,996	1,883
Net income available to common shareholders	693	517	1,910	1,759
Net income available to common shareholders	$ 693	$ 517	$ 1,910	$ 1,759
Earnings per common share:
Basic (in USD per share)	$ 1.99	$ 1.47	$ 5.49	$ 4.99
Diluted (in USD per share)	$ 1.96	$ 1.45	$ 5.40	$ 4.93
Average common shares outstanding (in thousands):
Basic (in shares)	347,718	352,586	348,106	352,829
Diluted (in shares)	353,494	357,168	353,376	356,971
Cash dividends declared (in USD per share)	$ 0.57	$ 0.52	$ 1.61	$ 1.56

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 714	$ 555	$ 1,996	$ 1,883
Other comprehensive income (loss), net of related taxes:
Foreign currency translation, net of related taxes of $18 and ($14), respectively	(156)	283	(307)	135
Net unrealized gains (losses) on available-for-sale securities, net of reclassification adjustment and net of related taxes of ($39) and $4, respectively	(107)	2	(567)	463
Net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, net of related taxes of $4 and $2, respectively	13	4	9	0
Net unrealized gains (losses) on cash flow hedges, net of related taxes of ($4) and $8, respectively	(12)	29	(16)	152
Net unrealized gains (losses) on retirement plans, net of related taxes of $1 and zero, respectively	2	1	12	15
Other comprehensive income (loss)	(260)	319	(869)	765
Total comprehensive income	$ 454	$ 874	$ 1,127	$ 2,648

Consolidated Statement of Com_2

Consolidated Statement of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Foreign currency translation, taxes	$ 18	$ (14)	$ 63	$ (20)
Change in net unrealized gains (losses) on available-for-sale securities, taxes	(39)	4	(214)	171
Change in net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, taxes	4	2	3	0
Change in net unrealized gains (losses) on cash flow hedges, taxes	(4)	8	(8)	55
Change in unrealized gains (losses) on retirement plans, taxes	$ 1	$ 0	$ 5	$ 5

Consolidated Statement of Condi

Consolidated Statement of Condition - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets:
Cash and due from banks	$ 4,606	$ 3,467
Interest-bearing deposits with banks	107,553	116,960
Securities purchased under resale agreements	2,847	3,106
Trading account assets	720	815
Investment securities available-for-sale	70,279	59,048
Investment securities held-to-maturity purchased under money market liquidity facility (less allowance for credit losses of $0 and $1) (fair value of $0 and $3,304)	0	3,299
Investment securities held-to-maturity (less allowance for credit losses of $2 and $2) (fair value of $43,728 and $50,003)	43,346	48,929
Loans (less allowance for credit losses on loans of $95 and $122)	32,702	27,803
Premises and equipment (net of accumulated depreciation of $5,235 and $4,825)	2,191	2,154
Accrued interest and fees receivable	3,407	3,105
Goodwill	7,650	7,683
Other intangible assets	1,887	1,827
Other assets	45,951	36,510
Total assets	323,139	314,706
Deposits:
Non-interest-bearing	64,885	49,439
Interest-bearing - U.S.	108,909	102,331
Interest-bearing - non-U.S.	85,579	88,028
Total deposits	259,373	239,798
Securities sold under repurchase agreements	637	3,413
Short-term borrowings under money market liquidity facility	0	3,302
Other short-term borrowings	549	685
Accrued expenses and other liabilities	22,288	27,503
Long-term debt	12,978	13,805
Total liabilities	295,825	288,506
Commitments, guarantees and contingencies (Notes 9 and 10)
Shareholders’ equity:
Common stock, $1 par, 750,000,000 shares authorized: 503,879,642 and 503,879,642 shares issued, and 357,389,416 and 379,946,724 shares outstanding	504	504
Surplus	10,763	10,205
Retained earnings	24,785	23,442
Accumulated other comprehensive income (loss)	(682)	187
Treasury stock, at cost (138,250,469 and 150,723,363 shares)	(10,032)	(10,609)
Total shareholders’ equity	27,314	26,200
Total liabilities and shareholders' equity	323,139	314,706
Series D Preferred Stock
Shareholders’ equity:
Preferred stock, no par: 3,500,000 shares authorized; Series C, 5,000 shares issued and outstanding, Series D, 7,500 shares issued and outstanding, Series E, 7,500 shares issued and outstanding, Series F, 7,500 shares issued and outstanding, Series G, 5,000 shares issued and outstanding, and Series H, 5,000 shares issued and outstanding	742	742
Series F Preferred Stock
Shareholders’ equity:
Preferred stock, no par: 3,500,000 shares authorized; Series C, 5,000 shares issued and outstanding, Series D, 7,500 shares issued and outstanding, Series E, 7,500 shares issued and outstanding, Series F, 7,500 shares issued and outstanding, Series G, 5,000 shares issued and outstanding, and Series H, 5,000 shares issued and outstanding	247	742
Series G Preferred Stock
Shareholders’ equity:
Preferred stock, no par: 3,500,000 shares authorized; Series C, 5,000 shares issued and outstanding, Series D, 7,500 shares issued and outstanding, Series E, 7,500 shares issued and outstanding, Series F, 7,500 shares issued and outstanding, Series G, 5,000 shares issued and outstanding, and Series H, 5,000 shares issued and outstanding	493	493
Series H Preferred Stock
Shareholders’ equity:
Preferred stock, no par: 3,500,000 shares authorized; Series C, 5,000 shares issued and outstanding, Series D, 7,500 shares issued and outstanding, Series E, 7,500 shares issued and outstanding, Series F, 7,500 shares issued and outstanding, Series G, 5,000 shares issued and outstanding, and Series H, 5,000 shares issued and outstanding	$ 494	$ 494

Consolidated Statement of Con_2

Consolidated Statement of Condition (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets, Current [Abstract]
Allowance for credit losses on all HTM investment securities	$ 0	$ 1
Investment securities held-to-maturity under money market liquidity facility, fair value	0	3,304
Allowance for credit losses on HTM investment securities excluding MMF	2	2
Investment securities held-to-maturity	43,728	50,003
Allowance for credit loss	95	122
Accumulated depreciation	$ 5,235	$ 4,825
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, no par value (in USD per share)	$ 0	$ 0
Preferred stock authorized (in shares)	3,500,000	3,500,000
Common stock, par value (usd per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares issued (in shares)	503,879,642	503,879,642
Common stock, shares outstanding (in shares)	365,629,173	353,156,279
Treasury stock, shares (in shares)	138,250,469	150,723,363
Series D Preferred Stock
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares issued (in shares)	7,500	7,500
Preferred stock, shares outstanding (in shares)	7,500	7,500
Series F Preferred Stock
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares issued (in shares)	2,500	2,500
Preferred stock, shares outstanding (in shares)	2,500	2,500
Series G Preferred Stock
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares issued (in shares)	5,000	5,000
Preferred stock, shares outstanding (in shares)	5,000	5,000
Series H Preferred Stock
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares issued (in shares)	5,000	5,000
Preferred stock, shares outstanding (in shares)	5,000	5,000

Consolidated Statement of Chang

Consolidated Statement of Changes In Shareholders' Equity - USD ($) shares in Thousands, $ in Millions		Total		Preferred Stock	Common Stock	Surplus	Retained Earnings		Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance at Dec. 31, 2019		$ 24,431		$ 2,962	$ 504	$ 10,132	$ 21,918		$ (876)	$ (10,209)
Beginning balance (shares) at Dec. 31, 2019					503,880					146,490
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		634					634
Other comprehensive income (loss)		(44)							(44)
Preferred stock redeemed		(500)		(491)			(9)
Cash dividends declared:
Common stock dividends		(183)					(183)
Preferred stock cash dividend		(44)					(44)
Common stock acquired (shares)										6,464
Common stock acquired		(500)								$ (500)
Common stock awards exercised		68				23				$ 45
Common stock awards exercised (shares)										(1,017)
Other		(1)	[1]			0	(1)	[1]		$ 0
Other (shares)	[1]									(1)
Ending balance at Mar. 31, 2020		23,861		2,471	$ 504	10,155	22,315		(920)	$ (10,664)
Ending balance (shares) at Mar. 31, 2020					503,880					151,936
Beginning balance at Dec. 31, 2019		24,431		2,962	$ 504	10,132	21,918		(876)	$ (10,209)
Beginning balance (shares) at Dec. 31, 2019					503,880					146,490
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,883
Other comprehensive income (loss)		765
Cash dividends declared:
Common stock dividends		(550)
Preferred stock cash dividend		(114)
Ending balance at Sep. 30, 2020		25,558		2,471	$ 504	10,192	23,128		(111)	$ (10,626)
Ending balance (shares) at Sep. 30, 2020					503,880					151,082
Cash dividends declared:
Retained earnings | Accounting Standards Update 2016-13		3
Beginning balance at Mar. 31, 2020		23,861		2,471	$ 504	10,155	22,315		(920)	$ (10,664)
Beginning balance (shares) at Mar. 31, 2020					503,880					151,936
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		694					694
Other comprehensive income (loss)		490							490
Cash dividends declared:
Common stock dividends		(183)					(183)
Preferred stock cash dividend		(32)					(32)
Common stock acquired (shares)
Common stock acquired		0
Common stock awards exercised		44				24				$ 20
Common stock awards exercised (shares)										(443)
Other		(1)								$ (1)
Other (shares)										(3)
Ending balance at Jun. 30, 2020		24,873		2,471	$ 504	10,179	22,794		(430)	$ (10,645)
Ending balance (shares) at Jun. 30, 2020					503,880					151,496
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		555					555
Other comprehensive income (loss)		319							319
Cash dividends declared:
Common stock dividends		(184)					(184)
Preferred stock cash dividend		(38)					(38)
Common stock awards exercised		32				13				$ 19
Common stock awards exercised (shares)										(417)
Other		1					1			$ 0
Other (shares)										(3)
Ending balance at Sep. 30, 2020		25,558		2,471	$ 504	10,192	23,128		(111)	$ (10,626)
Ending balance (shares) at Sep. 30, 2020					503,880					151,082
Cash dividends declared:
Retained earnings		(23,442)
Beginning balance at Dec. 31, 2020		26,200		2,471	$ 504	10,205	23,442		187	$ (10,609)
Beginning balance (shares) at Dec. 31, 2020					503,880					150,723
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		519					519
Other comprehensive income (loss)		(605)							(605)
Preferred stock redeemed		(500)		(495)			(5)
Cash dividends declared:
Common stock dividends		(182)					(182)
Preferred stock cash dividend		(25)					(25)
Common stock acquired (shares)										6,233
Common stock acquired		(475)								$ (475)
Common stock awards exercised		71				22				$ 49
Common stock awards exercised (shares)										(1,111)
Other		2					2
Other (shares)										(2)
Ending balance at Mar. 31, 2021		25,005		1,976	$ 504	10,227	23,751		(418)	$ (11,035)
Ending balance (shares) at Mar. 31, 2021					503,880					155,847
Beginning balance at Dec. 31, 2020		26,200		2,471	$ 504	10,205	23,442		187	$ (10,609)
Beginning balance (shares) at Dec. 31, 2020					503,880					150,723
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,996
Other comprehensive income (loss)		(869)
Cash dividends declared:
Common stock dividends		(570)
Preferred stock cash dividend		(79)
Ending balance at Sep. 30, 2021		27,314		1,976	$ 504	10,763	24,785		(682)	$ (10,032)
Ending balance (shares) at Sep. 30, 2021					503,880					138,250
Beginning balance at Mar. 31, 2021		25,005		1,976	$ 504	10,227	23,751		(418)	$ (11,035)
Beginning balance (shares) at Mar. 31, 2021					503,880					155,847
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		763					763
Other comprehensive income (loss)		(4)							(4)
Cash dividends declared:
Common stock dividends		(179)					(179)
Preferred stock cash dividend		(34)					(34)
Common stock acquired (shares)										5,017
Common stock acquired		(425)								$ (425)
Common stock awards exercised		42				19				$ 23
Common stock awards exercised (shares)										(487)
Other		(1)					(1)
Ending balance at Jun. 30, 2021		25,167		1,976	$ 504	10,246	24,300		(422)	$ (11,437)
Ending balance (shares) at Jun. 30, 2021					503,880					160,377
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		714					714
Other comprehensive income (loss)		(260)							(260)
Cash dividends declared:
Common stock dividends		(209)					(209)
Preferred stock cash dividend		(20)					(20)
Common stock awards exercised		28				8				$ 20
Common stock awards exercised (shares)										(399)
Common stock issued		1,900				516				$ 1,384
Common stock issued (in shares)										(21,724)
Other		(6)				(7)				$ 1
Other (shares)										(4)
Ending balance at Sep. 30, 2021		27,314		$ 1,976	$ 504	$ 10,763	$ 24,785		$ (682)	$ (10,032)
Ending balance (shares) at Sep. 30, 2021					503,880					138,250
Cash dividends declared:
Retained earnings		$ (24,785)
[1]	Includes the impact of transitioning to ASC 326: Measurement of Credit Losses on Financial Instruments, consisting of a decrease in retained earnings of $3 million in the first quarter of 2020.

Consolidated Statement of Cha_2

Consolidated Statement of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in USD per share)	$ 0.57	$ 0.52	$ 0.52	$ 0.52	$ 0.52	$ 0.52	$ 1.61	$ 1.56

Consolidated Statement of Cash

Consolidated Statement of Cash Flows - USD ($) $ in Millions	1 Months Ended	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Operating Activities:
Net income		$ 714	$ 519	$ 555	$ 634	$ 1,996	$ 1,883
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax (benefit)						(52)	(35)
Amortization of other intangible assets		62		59		183	175	$ 234
Other non-cash adjustments for depreciation, amortization and accretion, net						1,015	(793)
Losses (gains) related to investment securities, net						1	(2)
Provision for credit losses						(26)	88
Change in trading account assets, net						94	74
Change in accrued interest and fees receivable, net						(302)	(60)
Change in collateral deposits, net						(7,723)	1,369
Change in unrealized losses (gains) on foreign exchange derivatives, net						(8,131)	(2,934)
Change in other assets, net						279	(430)
Change in accrued expenses and other liabilities, net						1,468	526
Other, net						261	295
Net cash (used in) provided by operating activities						(10,937)	156
Investing Activities:
Net (increase) decrease in interest-bearing deposits with banks						9,407	(7,002)
Net (increase) decrease in securities purchased under resale agreements						259	(3,012)
Proceeds from sales of available-for-sale securities						9,252	2,245
Proceeds from maturities of available-for-sale securities						16,281	16,257
Purchases of available-for-sale securities						(39,972)	(30,344)
Purchases of held-to-maturity securities under the MMLF program						0	(29,242)
Proceeds from maturities of held-to-maturity securities under the MMLF program						3,299	24,457
Proceeds from maturities of held-to-maturity securities						12,564	10,863
Purchases of held-to-maturity securities						(5,984)	(8,994)
Sale of loans						64	242
Net (increase) in loans						(4,873)	(967)
Business acquisitions, net of cash acquired						(346)	0
Divestitures						13	0
Purchases of equity investments and other long-term assets						(122)	(1,237)
Purchases of premises and equipment, net						(556)	(424)
Other, net						236	1,036
Net cash provided by (used in) investing activities						(478)	(26,122)
Financing Activities:
Net (decrease) increase in time deposits						(1,643)	(35,146)
Net increase (decrease) in all other deposits						21,227	50,786
Net (decrease) increase in securities sold under repurchase agreements						(2,776)	1,328
Net (decrease) increase in short-term borrowings under money market liquidity facility						(3,302)	4,819
Net (decrease) increase in other short-term borrowings						(137)	4,999
Proceeds from issuance of long-term debt, net of issuance costs						844	2,497
Payments for long-term debt and obligations under finance leases						(1,530)	(24)
Payments for redemption of preferred stock						(500)	(500)
Proceeds from issuance of common stock, net of issuance costs	$ 1,900					1,900	0
Repurchases of common stock						(900)	(515)
Repurchases of common stock for employee tax withholding						(6)	(66)
Payments for cash dividends						(623)	(666)
Net cash (used in) provided by financing activities						12,554	27,512
Net increase						1,139	1,546
Cash and due from banks at beginning of period			$ 3,467		$ 3,302	3,467	3,302	3,302
Cash and due from banks at end of period	$ 4,606	$ 4,606		$ 4,848		$ 4,606	$ 4,848	$ 3,467

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accounting and financial reporting policies of State Street Corporation conform to U.S. GAAP. State Street Corporation, the Parent Company, is a financial holding company headquartered in Boston, Massachusetts. Unless otherwise indicated or unless the context requires otherwise, all references in these notes to consolidated financial statements to “State Street,” “we,” “us,” “our” or similar references mean State Street Corporation and its subsidiaries on a consolidated basis, including our principal banking subsidiary, State Street Bank. The accompanying consolidated financial statements should be read in conjunction with the financial and risk factor information included in our 2020 Form 10-K, which we previously filed with the SEC. The consolidated financial statements accompanying these condensed notes are unaudited. In the opinion of management, all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair statement of the consolidated results of operations in these financial statements, have been made. Certain previously reported amounts presented in this Form 10-Q have been reclassified to conform to current-period presentation. Events occurring subsequent to the date of our consolidated statement of condition were evaluated for potential recognition or disclosure in our consolidated financial statements through the date we filed this Form 10-Q with the SEC. The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions in the application of certain of our significant accounting policies that may materially affect the reported amounts of assets, liabilities, equity, revenue and expenses. As a result of unanticipated events or circumstances, actual results could differ from those estimates. These accounting estimates reflect the best judgment of management, but actual results could differ. Our consolidated statement of condition as of December 31, 2020 included in the accompanying consolidated financial statements was derived from the audited financial statements as of that date, but does not include all notes required by U.S. GAAP for a complete set of consolidated financial statements. In September 2021, we announced that we had entered into a definitive agreement to acquire the BBH Investor Services business for $3.5 billion in cash. Recent Accounting Developments We did not adopt any new accounting standards in the third quarter of 2021 that had a material impact to our financial statements. Additionally, we continue to evaluate accounting standards that were recently issued but not yet adopted as of September 30, 2021; none are expected to have a material impact to our financial statements.

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Fair Value Measurements We carry trading account assets and liabilities, AFS debt securities, certain equity securities and various types of derivative financial instruments, at fair value in our consolidated statement of condition on a recurring basis. Changes in the fair values of these financial assets and liabilities are recorded either as components of our consolidated statement of income or as components of AOCI within shareholders' equity in our consolidated statement of condition. We measure fair value for the above-described financial assets and liabilities in conformity with U.S. GAAP that governs the measurement of the fair value of financial instruments. Management believes that its valuation techniques and underlying assumptions used to measure fair value conform to the provisions of U.S. GAAP. We categorize the financial assets and liabilities that we carry at fair value based on a prescribed three-level valuation hierarchy. For information about our valuation techniques for financial assets and financial liabilities measured at fair value and the fair value hierarchy, refer to pages 135 to 142 in Note 2 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. The following tables present information with respect to our financial assets and liabilities carried at fair value in our consolidated statement of condition on a recurring basis as of the dates indicated: Fair Value Measurements on a Recurring Basis As of September 30, 2021 (In millions) Quoted Market Prices in Active Markets (Level 1) Pricing Methods with Significant Observable Market Inputs (Level 2) Pricing Methods with Significant Unobservable Market Inputs (Level 3) Impact of Netting (1) Total Net Carrying Value in Consolidated Statement of Condition Assets: Trading account assets: U.S. government securities $ 40 $ — $ — $ 40 Non-U.S. government securities — 135 — 135 Other — 545 — 545 Total trading account assets 40 680 — 720 Available-for-sale investment securities: U.S. Treasury and federal agencies: Direct obligations 14,339 — — 14,339 Mortgage-backed securities — 16,223 — 16,223 Total U.S. Treasury and federal agencies 14,339 16,223 — 30,562 Non-U.S. debt securities: Mortgage-backed securities — 2,141 — 2,141 Asset-backed securities — 2,365 — 2,365 Non-U.S. sovereign, supranational and non-U.S. agency — 22,854 — 22,854 Other — 3,306 — 3,306 Total non-U.S. debt securities — 30,666 — 30,666 Asset-backed securities: Student loans — 231 — 231 Collateralized loan obligations — 4,296 — 4,296 Non-agency CMBS and RMBS (2) — 59 — 59 Other — 92 — 92 Total asset-backed securities — 4,678 — 4,678 State and political subdivisions — 1,396 — 1,396 Other U.S. debt securities — 2,977 — 2,977 Total available-for-sale investment securities 14,339 55,940 — 70,279 Other assets: Derivative instruments: Foreign exchange contracts — 16,451 2 $ (8,892) 7,561 Interest rate contracts 4 — — — 4 Total derivative instruments 4 16,451 2 (8,892) 7,565 Other — 652 — — 652 Total assets carried at fair value $ 14,383 $ 73,723 $ 2 $ (8,892) $ 79,216 Liabilities: Accrued expenses and other liabilities: Derivative instruments: Foreign exchange contracts $ 2 $ 15,733 $ — $ (11,619) $ 4,116 Interest rate contracts — 27 — (4) 23 Other derivative contracts — 176 — — 176 Total derivative instruments 2 15,936 — (11,623) 4,315 Total liabilities carried at fair value $ 2 $ 15,936 $ — $ (11,623) $ 4,315 (1) Represents counterparty netting against level 2 financial assets and liabilities where a legally enforceable master netting agreement exists between us and the counterparty. Netting also reflects asset and liability reductions of $1.23 billion and $3.96 billion, respectively, for cash collateral received from and provided to derivative counterparties. (2) Consists entirely of non-agency CMBS. Fair Value Measurements on a Recurring Basis As of December 31, 2020 (In millions) Quoted Market Pricing Methods Pricing Methods Impact of Netting (1) Total Net Assets: Trading account assets: U.S. government securities $ 40 $ — $ — $ 40 Non-U.S. government securities — 239 — 239 Other 17 519 — 536 Total trading account assets 57 758 — 815 Available-for-sale investment securities: U.S. Treasury and federal agencies: Direct obligations 6,575 — — 6,575 Mortgage-backed securities — 14,305 — 14,305 Total U.S. Treasury and federal agencies 6,575 14,305 — 20,880 Non-U.S. debt securities: Mortgage-backed securities — 1,996 — 1,996 Asset-backed securities — 2,291 — 2,291 Non-U.S. sovereign, supranational and non-U.S. agency — 22,087 — 22,087 Other — 3,355 — 3,355 Total non-U.S. debt securities — 29,729 — 29,729 Asset-backed securities: Student loans — 314 — 314 Collateralized loan obligations — 2,952 14 2,966 Non-agency CMBS and RMBS (2) — 78 — 78 Other — 90 — 90 Total asset-backed securities — 3,434 14 3,448 State and political subdivisions — 1,548 — 1,548 Other U.S. debt securities — 3,443 — 3,443 Total available-for-sale investment securities 6,575 52,459 14 59,048 Other assets: Derivative instruments: Foreign exchange contracts — 25,941 2 $ (20,140) 5,803 Interest rate contracts 1 — — — 1 Total derivative instruments 1 25,941 2 (20,140) 5,804 Other — 525 — — 525 Total assets carried at fair value $ 6,633 $ 79,683 $ 16 $ (20,140) $ 66,192 Liabilities: Accrued expenses and other liabilities: Trading account liabilities: Other $ 4 $ — $ — $ — $ 4 Derivative instruments: Foreign exchange contracts 1 25,925 1 (15,558) 10,369 Interest rate contracts — 42 — — 42 Other derivative contracts — 157 — — 157 Total derivative instruments 1 26,124 1 (15,558) 10,568 Total liabilities carried at fair value $ 5 $ 26,124 $ 1 $ (15,558) $ 10,572 (1) Represents counterparty netting against level 2 financial assets and liabilities where a legally enforceable master netting agreement exists between us and the counterparty. Netting also reflects asset and liability reductions of $5.87 billion and $1.29 billion, respectively, for cash collateral received from and provided to derivative counterparties. (2) Consists entirely of non-agency CMBS. The following tables present activity related to our level 3 financial assets during the three and nine months ended September 30, 2021 and 2020, respectively. Transfers into and out of level 3 are reported as of the beginning of the period presented. During the three months ended September 30, 2021, there were no transfers into and out of level 3. During the nine months ended September 30, 2021, transfers into level 3 were primarily related to a U.S. corporate bond, for which fair value was measured using information obtained from third party sources, including non-binding broker/dealer quotes. During the nine months ended September 30, 2021, transfers out of level 3 were primarily related to collateralized loan obligations and a U.S. corporate bond, for which fair value was measured using prices for which observable market information became available. During the three and nine months ended September 30, 2020, transfers into level 3 were primarily related to collateralized loan obligations. During the three and nine months ended September 30, 2020, there were no transfers out of level 3. Fair Value Measurements Using Significant Unobservable Inputs Three Months Ended September 30, 2021 Fair Value as of June 30, 2021 Total Realized and Unrealized Gains (Losses) (1) Purchases Sales Settlements Transfers into Level 3 Transfers out of Level 3 Fair Value as of September 30, 2021 (1) Change in Unrealized Gains (Losses) Related to Financial Instruments (In millions) Recorded in Revenue (1) Recorded in Other Comprehensive Income (1) Assets: Other assets: Derivative instruments: Foreign exchange contracts $ 2 $ — $ — $ 1 $ — $ (1) $ — $ — $ 2 $ — Total derivative instruments 2 — — 1 — (1) — — 2 — Total assets carried at fair value $ 2 $ — $ — $ 1 $ — $ (1) $ — $ — $ 2 $ — (1) Total realized and unrealized gains (losses) on derivative instruments are included within foreign exchange trading services. Fair Value Measurements Using Significant Unobservable Inputs Nine Months Ended September 30, 2021 Fair Value as of Total Realized and Unrealized Gains (Losses) (1) Purchases Sales Settlements Transfers into Level 3 Transfers out of Level 3 Fair Value as of September 30, 2021 (1) Change in Unrealized Gains (Losses) Related to Financial Instruments (In millions) Recorded in Revenue (1) Recorded in Other Comprehensive Income (1) Assets: Available-for-sale Investment securities: Asset-backed securities: Collateralized loan obligations $ 14 $ — $ — $ 106 $ — $ — $ — $ (120) $ — Total asset-backed securities 14 — — 106 — — — (120) — Other U.S. debt securities — — — — — — 15 (15) — Total available-for-sale investment securities 14 — — 106 — — 15 (135) — Other assets: Derivative instruments: Foreign exchange contracts 2 (3) — 4 — (1) — — 2 $ (1) Total derivative instruments 2 (3) — 4 — (1) — — 2 (1) Total assets carried at fair value $ 16 $ (3) $ — $ 110 $ — $ (1) $ 15 $ (135) $ 2 $ (1) (1) Total realized and unrealized gains (losses) on AFS investment securities are included within gains (losses) related to investment securities, net. Total realized and unrealized gains (losses) on derivative instruments are included within foreign exchange trading services. Fair Value Measurements Using Significant Unobservable Inputs Three Months Ended September 30, 2020 Fair Value Total Realized and Unrealized Gains (Losses) (1) Purchases Sales Settlements Transfers Transfers Fair Value as of September 30, 2020 (1) Change in Unrealized Gains (Losses) Related to Financial Instruments (In millions) Recorded (1) Recorded (1) Assets: Available-for-sale Investment securities: Asset-backed securities: Collateralized loan obligations $ 1,869 $ — $ 14 $ 663 $ (34) $ (24) $ 50 $ — $ 2,538 Total asset-backed securities 1,869 — 14 663 (34) (24) 50 — 2,538 Non-U.S. debt securities: Asset-backed securities 876 — 45 — — (3) — — 918 Other 45 — 2 — — — — — 47 Total non-U.S. debt securities 921 — 47 — — (3) — — 965 Total available-for-sale investment securities 2,790 — 61 663 (34) (27) 50 — 3,503 Other assets: Derivative instruments: Foreign exchange contracts 2 (2) — 9 — (3) — — 6 $ (4) Total derivative instruments 2 (2) — 9 — (3) — — 6 (4) Total assets carried at fair value $ 2,792 $ (2) $ 61 $ 672 $ (34) $ (30) $ 50 $ — $ 3,509 $ (4) ( 1) Total realized and unrealized gains (losses) on AFS investment securities are included within gains (losses) related to investment securities, net. Total realized and unrealized gains (losses) on derivative instruments are included within foreign exchange trading services. Fair Value Measurements Using Significant Unobservable Inputs Nine Months Ended September 30, 2020 Fair Value Total Realized and Unrealized Gains (Losses) (1) Purchases Sales Settlements Transfers Transfers Fair Value as of September 30, 2020 (1) Change in Unrealized Gains (Losses) Related to Financial Instruments (In millions) Recorded (1) Recorded (1) Assets: Available-for-sale Investment securities: Asset-backed securities: Collateralized loan obligations $ 1,820 $ — $ (10) $ 850 $ (95) $ (77) $ 50 $ — $ 2,538 Total asset-backed securities 1,820 — (10) 850 (95) (77) 50 — 2,538 Non-U.S. debt securities: Asset-backed securities 887 — 35 1 — (5) — — 918 Other 45 — 2 — — — — — 47 Total non-U.S. debt securities 932 — 37 1 — (5) — — 965 Total available-for-sale investment securities 2,752 — 27 851 (95) (82) 50 — 3,503 Other assets: Derivative instruments: Foreign exchange contracts 4 (7) — 10 — (1) — — 6 $ (4) Total derivative instruments 4 (7) — 10 — (1) — — 6 (4) Total assets carried at fair value $ 2,756 $ (7) $ 27 $ 861 $ (95) $ (83) $ 50 $ — $ 3,509 $ (4) ( 1) Total realized and unrealized gains (losses) on AFS investment securities are included within gains (losses) related to investment securities, net. Total realized and unrealized gains (losses) on derivative instruments are included within foreign exchange trading services. The following table presents quantitative information, as of the dates indicated, about the valuation techniques and significant unobservable inputs used in the valuation of our level 3 financial assets and liabilities measured at fair value on a recurring basis for which we use internally-developed pricing models. The significant unobservable inputs for our level 3 financial assets and liabilities whose fair value is measured using pricing information from non-binding broker/dealer quotes are not included in the table, as the specific inputs applied are not provided by the broker/dealer. Quantitative Information about Level 3 Fair Value Measurements Fair Value Range Weighted-Average (Dollars in millions) As of September 30, 2021 As of December 31, 2020 Valuation Technique Significant Unobservable Input (1) As of September 30, 2021 As of September 30, 2021 As of December 31, 2020 Significant unobservable inputs readily available to State Street: Assets: Derivative Instruments, foreign exchange contracts $ 2 $ 2 Option model Volatility 5.0% - 12.6% 7.6 % 7.9 % Total $ 2 $ 2 Liabilities: Derivative instruments, foreign exchange contracts $ — $ 1 Option model Volatility 6.9% - 8.0% 7.4 % 7.7 % Total $ — $ 1 (1) Significant changes in these unobservable inputs may result in significant changes in fair value measurement of the derivative instrument. Fair Value Estimates Estimates of fair value for financial instruments not carried at fair value in our consolidated statement of condition are generally subjective in nature, and are determined as of a specific point in time based on the characteristics of the financial instruments and relevant market information. The following tables present the reported amounts and estimated fair values of the financial assets and liabilities not carried at fair value, as they would be categorized within the fair value hierarchy, as of the dates indicated: Fair Value Hierarchy (In millions) Reported Amount Estimated Fair Value Quoted Market Prices in Active Markets (Level 1) Pricing Methods with Significant Observable Market Inputs (Level 2) Pricing Methods with Significant Unobservable Market Inputs (Level 3) September 30, 2021 Financial Assets: Cash and due from banks $ 4,606 4,606 $ 4,606 $ — $ — Interest-bearing deposits with banks 107,553 107,553 — 107,553 — Securities purchased under resale agreements 2,847 2,847 — 2,847 — Investment securities held-to-maturity 43,346 43,728 2,708 41,020 — Net loans (1) 32,702 32,806 — 30,292 2,514 Financial Liabilities: Deposits: Non-interest-bearing $ 64,885 $ 64,885 $ — $ 64,885 $ — Interest-bearing - U.S. 108,909 108,909 — 108,909 — Interest-bearing - non-U.S. 85,579 85,579 — 85,579 — Securities sold under repurchase agreements 637 637 — 637 — Other short-term borrowings 549 549 — 549 — Long-term debt 12,978 13,151 — 13,069 82 (1) Includes $61 million of loans classified as held-for-sale that were measured at fair value in level 2 as of September 30, 2021. Fair Value Hierarchy (In millions) Reported Amount Estimated Fair Value Quoted Market Prices in Active Markets (Level 1) Pricing Methods with Significant Observable Market Inputs (Level 2) Pricing Methods with Significant Unobservable Market Inputs (Level 3) December 31, 2020 Financial Assets: Cash and due from banks $ 3,467 $ 3,467 $ 3,467 $ — $ — Interest-bearing deposits with banks 116,960 116,960 — 116,960 — Securities purchased under resale agreements 3,106 3,106 — 3,106 — HTM securities purchased under the MMLF 3,299 3,304 — 3,304 — Investment securities held-to-maturity 48,929 50,003 6,115 43,888 — Net loans 27,803 27,884 — 25,668 2,216 Other (1) 4,753 4,753 — 4,753 — Financial Liabilities: Deposits: Non-interest-bearing $ 49,439 $ 49,439 $ — $ 49,439 $ — Interest-bearing - U.S. 102,331 102,331 — 102,331 — Interest-bearing - non-U.S. 88,028 88,028 — 88,028 — Securities sold under repurchase agreements 3,413 3,413 — 3,413 — Short-term borrowings under the MMLF 3,302 3,302 — 3,302 — Other short-term borrowings 685 685 — 685 — Long-term debt 13,805 14,162 — 14,049 113 Other (1) 4,753 4,753 — 4,753 — (1) Represents a portion of underlying client assets related to our enhanced custody business, which clients have allowed us to transfer and re-pledge.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Investment securities held by us are classified as either trading account assets, AFS, HTM or equity securities held at fair value at the time of purchase and reassessed periodically, based on management’s intent. For additional information on our accounting for investment securities, refer to page 143 in Note 3 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. Trading assets are carried at fair value. Both realized and unrealized gains and losses on trading assets are recorded in foreign exchange trading services revenue in our consolidated statement of income. AFS securities are carried at fair value, with any allowance for credit losses recorded through the consolidated statement of income and after-tax net unrealized gains and losses are recorded in AOCI. Gains or losses realized on sales of AFS investment securities are computed using the specific identification method and are recorded in gains (losses) related to investment securities, net, in our consolidated statement of income. HTM investment securities are carried at cost, adjusted for amortization of premiums and accretion of discounts, with any allowance for credit losses recorded through the consolidated statement of income. As of September 30, 2021, we recognized an allowance for credit losses on HTM investment securities of $2 million. The following table presents the amortized cost, fair value and associated unrealized gains and losses of AFS and HTM investment securities as of the dates indicated: September 30, 2021 December 31, 2020 Amortized Cost Gross Unrealized Fair Value Amortized Cost Gross Unrealized Fair Value (In millions) Gains Losses Gains Losses Available-for-sale: U.S. Treasury and federal agencies: Direct obligations $ 14,372 $ 30 $ 63 $ 14,339 $ 6,453 $ 123 $ 1 $ 6,575 Mortgage-backed securities 16,051 215 43 16,223 13,891 421 7 14,305 Total U.S. Treasury and federal agencies 30,423 245 106 30,562 20,344 544 8 20,880 Non-U.S. debt securities: Mortgage-backed securities 2,130 12 1 2,141 1,994 4 2 1,996 Asset-backed securities 2,365 2 2 2,365 2,294 1 4 2,291 Non-U.S. sovereign, supranational and non-U.S. agency 22,747 150 43 22,854 21,769 321 3 22,087 Other (1) 3,294 29 17 3,306 3,297 58 — 3,355 Total non-U.S. debt securities 30,536 193 63 30,666 29,354 384 9 29,729 Asset-backed securities: Student loans (2) 228 3 — 231 313 2 1 314 Collateralized loan obligations (3) 4,293 4 1 4,296 2,969 3 6 2,966 Non-agency CMBS and RMBS (4) 58 1 — 59 76 2 — 78 Other 90 2 — 92 90 — — 90 Total asset-backed securities 4,669 10 1 4,678 3,448 7 7 3,448 State and political subdivisions (5) 1,336 63 3 1,396 1,470 80 2 1,548 Other U.S. debt securities (6) 2,943 39 5 2,977 3,371 72 — 3,443 Total available-for-sale securities (7) $ 69,907 $ 550 $ 178 $ 70,279 $ 57,987 $ 1,087 $ 26 $ 59,048 Held-to-maturity: U.S. Treasury and federal agencies: Direct obligations $ 2,709 $ 22 $ — $ 2,731 $ 6,057 $ 83 $ — $ 6,140 Mortgage-backed securities 33,525 525 309 33,741 36,901 955 67 37,789 Total U.S. Treasury and federal agencies 36,234 547 309 36,472 42,958 1,038 67 43,929 Non-U.S. debt securities: Mortgage-backed securities 209 65 2 272 303 68 4 367 Non-U.S. sovereign, supranational and non-U.S. agency 1,508 — 3 1,505 342 — — 342 Total non-U.S. debt securities 1,717 65 5 1,777 645 68 4 709 Asset-backed securities: Student loans (2) 5,017 64 13 5,068 4,774 33 25 4,782 Non-agency CMBS and RMBS (8) 380 31 — 411 554 30 1 583 Total asset-backed securities 5,397 95 13 5,479 5,328 63 26 5,365 Total (7)(9) 43,348 707 327 43,728 48,931 1,169 97 50,003 Held-to-maturity under money market mutual fund liquidity facility — — — — 3,300 4 — 3,304 Total held-to-maturity securities (7) $ 43,348 $ 707 $ 327 $ 43,728 $ 52,231 $ 1,173 $ 97 $ 53,307 (1) As of September 30, 2021 and December 31, 2020, the fair value includes non-U.S. corporate bonds of $1.76 billion and $1.88 billion, respectively, and non-U.S. collateralized loan obligations of $0.88 billion and $0.96 billion, respectively. (2) Primarily comprised of securities guaranteed by the federal government with respect to at least 97% of defaulted principal and accrued interest on the underlying loans. (3) Excludes collateralized loan obligations in loan form. Refer to Note 4 for additional information. (4) Consists entirely of non-agency CMBS as of both September 30, 2021 and December 31, 2020. (5) As of September 30, 2021 and December 31, 2020, the fair value of state and political subdivisions includes securities in trusts of $0.61 billion and $0.70 billion, respectively. Additional information about these trusts is provided in Note 11. (6) As of September 30, 2021 and December 31, 2020, the fair value of U.S. corporate bonds was $2.98 billion and $3.44 billion, respectively. (7) An immaterial amount of accrued interest related to HTM and AFS investment securities was excluded from the amortized cost basis for the period ended September 30, 2021. (8) As of September 30, 2021 and December 31, 2020, the total amortized cost included $315 million and $464 million, respectively, of non-agency CMBS and $65 million and $90 million of non-agency RMBS, respectively. (9) As of September 30, 2021, we recognized an allowance for credit losses of $2 million on HTM investment securities. Aggregate investment securities with carrying values of approximately $77.85 billion and $70.57 billion as of September 30, 2021 and December 31, 2020, respectively, were designated as pledged for public and trust deposits, short-term borrowings and for other purposes as provided by law. The following tables present the aggregate fair values of AFS investment securities that have been in a continuous unrealized loss position for less than 12 months, and those that have been in a continuous unrealized loss position for 12 months or longer, as of the dates indicated: As of September 30, 2021 Less than 12 months 12 months or longer Total (In millions) Fair Gross Fair Gross Fair Gross Available-for-sale: U.S. Treasury and federal agencies: Direct obligations $ 11,538 $ 63 $ — $ — $ 11,538 $ 63 Mortgage-backed securities 3,847 41 162 2 4,009 43 Total U.S. Treasury and federal agencies 15,385 104 162 2 15,547 106 Non-U.S. debt securities: Mortgage-backed securities 394 1 33 — 427 1 Asset-backed securities 646 1 464 1 1,110 2 Non-U.S. sovereign, supranational and non-U.S. agency 5,631 42 39 1 5,670 43 Other 1,291 17 67 — 1,358 17 Total non-U.S. debt securities 7,962 61 603 2 8,565 63 Asset-backed securities: Collateralized loan obligations 2,516 1 62 — 2,578 1 Total asset-backed securities 2,516 1 62 — 2,578 1 State and political subdivisions 83 — 45 3 128 3 Other U.S. debt securities 573 5 — — 573 5 Total $ 26,519 $ 171 $ 872 $ 7 $ 27,391 $ 178 As of December 31, 2020 Less than 12 months 12 months or longer Total (In millions) Fair Gross Fair Gross Fair Gross Available-for-sale: U.S. Treasury and federal agencies: Direct obligations $ 1,636 $ 1 $ — $ — $ 1,636 $ 1 Mortgage-backed securities 1,394 7 63 — 1,457 7 Total U.S. Treasury and federal agencies 3,030 8 63 — 3,093 8 Asset-backed securities: Student loans 31 — 197 1 228 1 Collateralized loan obligations 1,498 4 369 2 1,867 6 Total asset-backed securities 1,529 4 566 3 2,095 7 Non-U.S. debt securities: Mortgage-backed securities 600 1 120 1 720 2 Asset-backed securities 1,015 3 446 1 1,461 4 Non-U.S. sovereign, supranational and non-U.S. agency 489 — — — 489 — Other 715 3 80 — 795 3 Total non-U.S. debt securities 2,819 7 646 2 3,465 9 State and political subdivisions 95 — 76 2 171 2 Other U.S. debt securities 17 — — — 17 — Total $ 7,490 $ 19 $ 1,351 $ 7 $ 8,841 $ 26 The following table presents the amortized cost and the fair value of contractual maturities of debt investment securities as of September 30, 2021. The maturities of certain ABS, MBS and collateralized mortgage obligations are based on expected principal payments. Actual maturities may differ from these expected maturities since certain borrowers have the right to prepay obligations with or without prepayment penalties. As of September 30, 2021 (In millions) Under 1 Year 1 to 5 Years 6 to 10 Years Over 10 Years Total Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale: U.S. Treasury and federal agencies: Direct obligations $ 2,112 $ 2,114 $ 11,214 $ 11,169 $ 1,046 $ 1,056 $ — $ — $ 14,372 $ 14,339 Mortgage-backed securities 83 87 845 855 6,227 6,248 8,896 9,033 16,051 16,223 Total U.S. Treasury and federal agencies 2,195 2,201 12,059 12,024 7,273 7,304 8,896 9,033 30,423 30,562 Non-U.S. debt securities: Mortgage-backed securities 212 213 540 543 40 40 1,338 1,345 2,130 2,141 Asset-backed securities 271 271 1,286 1,287 415 415 393 392 2,365 2,365 Non-U.S. sovereign, supranational and non-U.S. agency 5,828 5,835 13,987 14,081 2,917 2,923 15 15 22,747 22,854 Other 786 790 2,077 2,089 375 371 56 56 3,294 3,306 Total non-U.S. debt securities 7,097 7,109 17,890 18,000 3,747 3,749 1,802 1,808 30,536 30,666 Asset-backed securities: Student loans 129 131 — — — — 99 100 228 231 Collateralized loan obligations 29 30 760 761 1,656 1,656 1,848 1,849 4,293 4,296 Non-agency CMBS and RMBS — — — — — — 58 59 58 59 Other — — — — 90 92 — — 90 92 Total asset-backed securities 158 161 760 761 1,746 1,748 2,005 2,008 4,669 4,678 State and political subdivisions 159 160 544 563 528 567 105 106 1,336 1,396 Other U.S. debt securities 718 723 2,183 2,209 42 45 — — 2,943 2,977 Total $ 10,327 $ 10,354 $ 33,436 $ 33,557 $ 13,336 $ 13,413 $ 12,808 $ 12,955 $ 69,907 $ 70,279 Held-to-maturity: U.S. Treasury and federal agencies: Direct obligations $ 2,387 $ 2,403 $ 304 $ 309 $ — $ — $ 18 $ 19 $ 2,709 $ 2,731 Mortgage-backed securities 171 177 285 290 4,528 4,509 28,541 28,765 33,525 33,741 Total U.S. Treasury and federal agencies 2,558 2,580 589 599 4,528 4,509 28,559 28,784 36,234 36,472 Non-U.S. debt securities: Mortgage-backed securities 38 37 18 18 — — 153 217 209 272 Non-U.S. sovereign, supranational and non-U.S. agency 275 275 1,232 1,229 1 1 — — 1,508 1,505 Total non-U.S. debt securities 313 312 1,250 1,247 1 1 153 217 1,717 1,777 Asset-backed securities: Student loans 349 343 110 109 1,071 1,088 3,487 3,528 5,017 5,068 Non-agency CMBS and RMBS 127 140 158 160 2 2 93 109 380 411 Total asset-backed securities 476 483 268 269 1,073 1,090 3,580 3,637 5,397 5,479 Total $ 3,347 $ 3,375 $ 2,107 $ 2,115 $ 5,602 $ 5,600 $ 32,292 $ 32,638 $ 43,348 $ 43,728 Allowance for Credit Losses on Debt Securities and Impairment of AFS Securities We conduct quarterly reviews of HTM and AFS securities on a collective (pool) basis when similar risk characteristics exist to determine whether an allowance for credit losses should be recognized. We review individual AFS securities periodically to assess if additional impairment is required. For additional information about the Current Expected Credit Loss methodology and the review of investment securities for expected credit losses or impairment, refer to pages 148 to 149 in Note 3 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. We monitor the credit quality of the HTM and AFS investment securities using a variety of methods, including both external and internal credit ratings. As of September 30, 2021, 99% of our HTM and AFS investment portfolio is publicly rated investment grade. Our allowance for credit losses on our HTM securities is approximately $2 million as of September 30, 2021. In the third quarter of 2021, we recorded no provision for credit losses and no charge-offs on HTM securities. We have elected to not record an allowance on accrued interest for HTM and AFS securities. Accrued interest on these securities is reversed against interest income when payment on a security is delinquent for greater than 90 days from the date of payment.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Loans and Allowance for Credit Losses	Loans and Allowance for Credit Losses We segregate our loans into two segments: commercial and financial loans and commercial real estate loans. We further classify commercial and financial loans as fund finance loans, leveraged loans, overdrafts and other. These classifications reflect their risk characteristics, their initial measurement attributes and the methods we use to monitor and assess credit risk. For additional information on our loans, including our internal risk-rating system used to assess our risk of credit loss for each loan, refer to pages 149 to 154 in Note 4 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. The following table presents our recorded investment in loans, by segment, as of the dates indicated: (In millions) September 30, 2021 December 31, 2020 Domestic (1) : Commercial and financial: Fund Finance (2) $ 12,367 $ 11,531 Leveraged loans 3,407 2,923 Overdrafts 2,352 1,894 Other (3) 2,140 2,688 Commercial real estate 2,384 2,096 Total domestic 22,650 21,132 Foreign (1) : Commercial and financial: Fund Finance (2) 7,368 4,432 Leveraged loans 1,317 1,242 Overdrafts 1,462 1,088 Other (3) — 31 Total foreign 10,147 6,793 Total loans (2) 32,797 27,925 Allowance for credit losses (95) (122) Loans, net of allowance $ 32,702 $ 27,803 (1) Domestic and foreign categorization is based on the borrower’s country of domicile. (2) Fund finance loans include primarily $6,282 million loans to real money funds, $9,752 million private equity capital call finance loans, $993 million loans to business development companies and $2,412 million collateralized loan obligations in loan form as of September 30, 2021, compared to $6,391 million loans to real money funds, $8,380 million private equity capital call finance loans and $821 million loans to business development companies as of December 31, 2020. (3) Includes $1,532 million securities finance loans, $589 million loans to municipalities and $19 million other loans as of September 30, 2021 and $1,911 million securities finance loans, $754 million loans to municipalities and $54 million other loans as of December 31, 2020. The commercial and financial segment is composed of primarily fund finance loans, purchased leveraged loans, overdrafts and other loans. Fund finance loans are composed of revolving credit lines providing liquidity and leverage to mutual fund and private equity fund clients, as well as collateralized loan obligations in loan form. Certain loans are pledged as collateral for access to the Federal Reserve's discount window. As of September 30, 2021 and December 31, 2020, the loans pledged as collateral totaled $9.00 billion and $8.07 billion, respectively. As of September 30, 2021 and December 31, 2020, we had no loans on non-accrual status. We purchased $832 million collateralized loan obligations in loan form, which were all rated AAA, in the third quarter of 2021. We sold $84 million of leveraged loans in the third quarter of 2021, of which $46 million remained unsettled and was held for sale as of September 30, 2021. Additionally, we have one loan for $15 million which has been classified as doubtful and is pending settlement. In certain circumstances, we restructure troubled loans by granting concessions to borrowers experiencing financial difficulty. Once restructured, the loans are generally considered impaired until their maturity, regardless of whether the borrowers perform under the modified terms of the loans. There were no loans modified in troubled debt restructurings during the third quarter of 2021. Allowance for Credit Losses We recognize an allowance for credit losses in accordance with ASC 326 for financial assets held at amortized cost and off-balance sheet commitments. The allowance for credit losses is reviewed on a regular basis, and any provision for credit losses is recorded to reflect the amount necessary to maintain the allowance for expected credit losses at a level which represents what management does not expect to recover due to expected credit losses. For additional discussion on the allowance for credit losses for investment securities, please refer to Note 3, to the consolidated financial statements in this Form 10-Q. When the allowance is recorded, a provision for credit loss expense is recognized in net income. The allowance for credit losses for financial assets (excluding investment securities, as discussed in Note 3) represents the portion of the amortized cost basis, including accrued interest for financial assets held at amortized cost, which management does not expect to recover due to expected credit losses and is presented on the statement of condition as an offset to the amortized cost basis. The accrued interest balance is presented separately on the statement of condition within accrued interest and fees receivable. The allowance for off-balance sheet commitments is presented within other liabilities. The allowance for credit losses may be determined using various methods, including discounted cash flow methods, loss-rate methods, probability-of-default methods, and other quantitative or qualitative methods as determined by us. The method used to estimate expected credit losses may vary depending on the type of financial asset, our ability to predict the timing of cash flows, and the information available to us. We measure expected credit losses of financial assets on a collective (pool) basis when similar risk characteristic exist. Each reporting period, we assess whether the assets in the pool continue to display similar risk characteristics. For a financial asset that does not share risk characteristics with other assets, expected credit losses are measured separately using one or more of the methods noted above. As of September 30, 2021, we had nine loans for $232 million in the commercial and financial segment that no longer met the similar risk characteristics of their collective pool. We recorded an allowance for credit losses of $13 million as of September 30, 2021 on these loans. Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. In future periods, factors and forecasts then prevailing may result in significant changes in the allowance for credit losses in those future periods. We estimate credit losses over the contractual life of the financial asset, while factoring in prepayment activity, where supported by data, over a three year reasonable and supportable forecast period. We utilize a baseline, upside and downside scenario which are applied based on a probability weighting, in order to better reflect management’s expectation of expected credit losses given existing market conditions and the changes in the economic environment. The multiple scenarios are based on a three year horizon (or less depending on contractual maturity) and then revert linearly over a two year period to a ten-year historical average thereafter. The contractual term excludes expected extensions, renewals and modifications, but includes prepayment assumptions where applicable. As part of our allowance methodology, we establish qualitative reserves to address any risks inherent in our portfolio that are not addressed through our quantitative reserve assessment. These factors may relate to, among other things, legislation changes or new regulation, credit concentration, loan markets, scenario weighting and overall model limitations. The qualitative adjustments are applied to our portfolio of financial instruments under the existing governance structure and are inherently judgmental. For additional information on the allowance for credit losses, refer to pages 150 to 151 in Note 4 to the consolidated financial statements included under item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. Credit Quality Credit quality for financial assets held at amortized cost are continuously monitored by management and is reflected within the allowance for credit losses. We use an internal risk-rating system to assess our risk of credit loss for each loan. This risk-rating process incorporates the use of risk-rating tools in conjunction with management judgment. Qualitative and quantitative inputs are captured in a systematic manner, and following a formal review and approval process, an internal credit rating based on our credit scale is assigned. When computing allowance levels, credit loss assumptions are estimated using a model that categorizes asset pools based on loss history, delinquency status and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. In future periods evaluations of the overall asset portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and credit loss expense in those future periods. Credit quality is assessed and monitored by evaluating various attributes in order to enable the earliest possible detection of any concerns with the customer’s credit rating. The results of those evaluations are utilized in underwriting new loans and transactions with counterparties and in our process for estimation of expected credit losses. In assessing the risk rating assigned to each individual loan, among the factors considered are the borrower's debt capacity, collateral coverage, payment history and delinquency experience, financial flexibility and earnings strength, the expected amounts and source of repayment, the level and nature of contingencies, if any, and the industry and geography in which the borrower operates. These factors are based on an evaluation of historical and current information, and involve subjective assessment and interpretation. Credit counterparties are evaluated and risk-rated on an individual basis at least annually. Management considers the ratings to be current as of September 30, 2021. Our internal risk rating methodology assigns risk ratings to counterparties ranging from Investment Grade, Speculative, Special Mention, Substandard, Doubtful and Loss. • Investment Grade: Counterparties with strong credit quality and low expected credit risk and probability of default. Approximately 82% of our loans were rated as investment grade as of September 30, 2021 with external credit ratings, or equivalent, of "BBB-" or better. • Speculative: Counterparties that have the ability to repay but face significant uncertainties, such as adverse business, financial circumstances that could affect credit risk or economic downturns. Loans to counterparties rated as speculative account for approximately 17% of our loans as of September 30, 2021, and are concentrated in leveraged loans. Approximately 88% of those leveraged loans have an external credit rating, or equivalent, of "BB" or "B" as of September 30, 2021. • Special Mention: Counterparties with potential weaknesses that, if uncorrected, may result in deterioration of repayment prospects. • Substandard: Counterparties with well-defined weakness that jeopardizes repayment with the possibility we will sustain some loss. • Doubtful: Counterparties with well-defined weakness which make collection or liquidation in full highly questionable and improbable. • Loss: Counterparties which are uncollectible or have little value. The following tables present our recorded loans to counterparties by risk rating, as noted above, as of the dates indicated: September 30, 2021 Commercial and Financial Commercial Real Estate Total Loans (In millions) Investment grade $ 24,936 $ 1,963 $ 26,899 Speculative 5,180 383 5,563 Special mention 118 38 156 Substandard 164 — 164 Doubtful 15 — 15 Total (1) $ 30,413 $ 2,384 $ 32,797 December 31, 2020 Commercial and Financial Commercial Real Estate Total Loans (In millions) Investment grade $ 20,859 $ 1,724 $ 22,583 Speculative 4,852 372 5,224 Special mention 67 — 67 Substandard 34 — 34 Doubtful 17 — 17 Total (1) $ 25,829 $ 2,096 $ 27,925 (1) Loans Include $3,814 million and $2,982 million of overdrafts as of September 30, 2021 and December 31, 2020 respectively. Overdrafts are short-term in nature and do not present a significant credit risk to us. For additional information about credit quality, refer to pages 151 to 154 in Note 4 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. The following table presents the amortized cost basis, by year of origination and credit quality indicator, as of September 30, 2021. For origination years before the fifth annual period, we present the aggregate amortized cost basis of loans. For purchased loans, the date of issuance is used to determine the year of origination, not the date of acquisition. For modified, extended or renewed lending arrangements, we evaluate whether a credit event has occurred which would consider the loan to be a new arrangement. (In millions) 2021 2020 2019 2018 2017 Prior Revolving Loans Total (1) Domestic loans: Commercial and financial: Risk Rating: Investment grade $ 2,696 $ 14 $ 376 $ 2 $ 135 $ — $ 13,120 $ 16,343 Speculative 974 473 719 519 455 67 457 3,664 Special mention — — 70 29 19 — — 118 Substandard — 5 71 56 9 — — 141 Total commercial and financing $ 3,670 $ 492 $ 1,236 $ 606 $ 618 $ 67 $ 13,577 $ 20,266 Commercial real estate: Risk Rating: Investment grade $ 321 $ 129 $ 383 657 $ 276 $ 197 $ — $ 1,963 Speculative 120 49 166 20 — 28 — 383 Special mention — — — 38 — — — 38 Total commercial real estate $ 441 $ 178 $ 549 $ 715 $ 276 $ 225 $ — $ 2,384 Non-U.S. loans: Commercial and financial: Risk Rating: Investment grade $ 3,655 $ — $ — $ — $ — $ — $ 4,938 $ 8,593 Speculative 433 197 294 254 146 31 161 1,516 Substandard — — — 23 — — — 23 Doubtful — — — — 15 — — 15 Total commercial and financing $ 4,088 $ 197 $ 294 $ 277 $ 161 $ 31 $ 5,099 $ 10,147 Total loans $ 8,199 $ 867 $ 2,079 $ 1,598 $ 1,055 $ 323 $ 18,676 $ 32,797 (1) Any reserve associated with accrued interest is not material. As of September 30, 2021, accrued interest receivable of $82 million included in the amortized cost basis of loans has been excluded from the amortized cost basis within this table. The following table presents the amortized cost basis, by year of origination and credit quality indicator as of December 31, 2020: (In millions) 2020 2019 2018 2017 2016 Prior Revolving Loans Total (1) Domestic loans: Commercial and financial: Risk Rating: Investment grade $ 1,894 $ 388 $ 4 $ 167 $ 200 $ — $ 12,836 $ 15,489 Speculative 432 942 822 610 43 — 597 3,446 Special mention — 28 — 39 — — — 67 Substandard — 5 — — 29 — — 34 Total commercial and financing $ 2,326 $ 1,363 $ 826 $ 816 $ 272 $ — $ 13,433 $ 19,036 Commercial real estate: Risk Rating: Investment grade $ 178 $ 383 $ 688 $ 277 $ 197 $ — $ — $ 1,723 Speculative 120 166 58 — — 29 — 373 Total commercial real estate $ 298 $ 549 $ 746 $ 277 $ 197 $ 29 $ — $ 2,096 Non-U.S. loans: Commercial and financial: Risk Rating: Investment grade $ 1,028 $ — $ — $ — $ — $ — $ 4,343 $ 5,371 Speculative 283 401 346 162 26 66 121 1,405 Doubtful — — — 17 — — — 17 Total commercial and financing $ 1,311 $ 401 $ 346 $ 179 $ 26 $ 66 $ 4,464 $ 6,793 Total loans $ 3,935 $ 2,313 $ 1,918 $ 1,272 $ 495 $ 95 $ 17,897 $ 27,925 (1) Any reserve associated with accrued interest is not material. As of December 31, 2020, accrued interest receivable of $72 million included in the amortized cost basis of loans has been excluded from the amortized cost basis within this table. The following tables present the activity in the allowance for credit losses by portfolio and class for the periods indicated: Three Months Ended September 30, 2021 Commercial and Financial (In millions) Leveraged Loans Other Loans (1) Commercial Real Estate Held-to-Maturity Securities Off-Balance Sheet Commitments All Other Total Allowance for credit losses: Beginning balance $ 74 $ 12 $ 14 $ 2 $ 19 $ — $ 121 Charge-offs (1) — — — — — (1) Provision (4) — 1 — 1 — (2) Other (2) (1) — — — — — (1) Ending balance $ 68 $ 12 $ 15 $ 2 $ 20 $ — $ 117 (1) Includes $11 million allowance for credit losses on Fund Finance loans and $1 million on other loans. (2) The amount includes primarily foreign currency translation. Nine Months Ended September 30, 2021 Commercial and Financial (In millions) Leveraged Loans Other Loans (1) Commercial Real Estate Held-to-Maturity Securities Off-Balance Sheet Commitments All Other Total Allowance for credit losses: Beginning balance $ 97 $ 17 $ 8 $ 3 $ 22 $ 1 $ 148 Charge-offs (2) — — — — — (2) Provision (24) (5) 7 (1) (2) (1) (26) Other (2) (3) — — — — — (3) Ending balance $ 68 $ 12 $ 15 $ 2 $ 20 $ — $ 117 (1) Includes $11 million allowance for credit losses on Fund Finance loans and $1 million on other loans. (2) The amount includes primarily foreign currency translation. . Three Months Ended September 30, 2020 Commercial and Financial (In millions) Leveraged Loans Other Loans (1) Commercial Real Estate Held-to-Maturity Securities Off-Balance Sheet Commitments All Other Total Allowance for credit losses: Beginning balance $ 113 $ 20 $ 8 $ 3 $ 18 $ 1 $ 163 Charge-offs (2) (14) — — — — — (14) Provision 3 — — — (3) — — Foreign currency translation 4 — — — — — 4 Ending balance $ 106 $ 20 $ 8 $ 3 $ 15 $ 1 $ 153 (1) Includes $15 million allowance for credit losses on Fund Finance loans and $5 million on other loans. (2) Related to the sale of leveraged loans in the third quarter of 2020. Nine Months Ended September 30, 2020 Commercial and Financial (In millions) Leveraged Loans Other Loans Commercial Real Estate Held-to-Maturity Securities Off-Balance Sheet Commitments All Other Total Allowance for credit losses: Beginning balance $ 61 $ 10 $ 2 $ — $ 19 $ 1 $ 93 Charge-offs (1) (33) — — — — — (33) Provision 73 10 6 3 (4) — 88 Foreign currency translation 5 — — — — — 5 Ending balance $ 106 $ 20 $ 8 $ 3 $ 15 $ 1 $ 153 (1) Primarily related to the sale of leveraged loans in the third and third quarters of 2020. Loans are reviewed on a regular basis, and any provisions for credit losses that are recorded reflect management's estimate of the amount necessary to maintain the allowance for loan losses at a level considered appropriate to absorb estimated credit losses in the loan portfolio. In the third quarter of 2021, we reduced the allowance for credit losses by $4 million, principally through a $2 million reserve release in the provision for credit losses, compared to a decrease in the allowance for credit losses of $10 million in the third quarter of 2020. The reduction in the allowance reflects improvements in credit quality and stable economic outlook. Allowance estimates remain subject to continued model and economic uncertainty and management may use qualitative adjustments in the allowance estimates. If future data and forecasts deviate relative to the forecasts utilized to determine our allowance for credit losses as of September 30, 2021, or if credit risk migration is higher or lower than forecasted for reasons independent of the economic forecast, our allowance for credit losses will also change.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The following table presents changes in the carrying amount of goodwill during the periods indicated: (In millions) Investment Servicing (1) Investment Total Goodwill: Ending balance December 31, 2019 $ 7,289 $ 267 $ 7,556 Foreign currency translation 124 3 127 Ending balance December 31, 2020 7,413 270 7,683 Acquisitions (2) 66 — 66 Divestitures (3) (17) — (17) Foreign currency translation (80) (2) (82) Ending balance September 30, 2021 $ 7,382 $ 268 $ 7,650 (1) Investment Servicing includes our acquisition of CRD. (2) Investment Servicing includes our acquisitions of the depositary bank and fund administrator activities of Fideuram Bank Luxembourg, a subsidiary of Intesa Sanpaolo, in the first quarter of 2021, with a total purchase price of approximately EUR 220 million or approximately $258 million, and our acquisition of Mercatus, Inc.in the third quarter of 2021, with a total purchase price of approximately $88 million. We accounted for these acquisitions as business combinations and, in accordance with ASC Topic 805, Business Combinations, we have recorded assets acquired and liabilities assumed at their respective fair values as of the acquisition date. The purchase price accounting reflected is provisional and is based upon estimates and assumptions that are subject to change within the measurement period (up to one year from the acquisition date pursuant to ASC 805). The measurement period remains open for both transactions pending the completion of valuation procedures related to the acquired assets and assumed liabilities, primarily identifiable intangible assets. (3) In the second quarter of 2021, we sold a majority share of our WMS business. The following table presents changes in the net carrying amount of other intangible assets during the periods indicated: (In millions) Investment Servicing (1) Investment Total Other intangible assets: Ending balance December 31, 2019 $ 1,908 $ 122 $ 2,030 Amortization (206) (28) (234) Foreign currency translation 31 — 31 Ending balance December 31, 2020 1,733 94 1,827 Acquisitions (2) 263 — 263 Amortization (165) (18) (183) Foreign currency translation (20) — (20) Ending balance September 30, 2021 $ 1,811 $ 76 $ 1,887 (1) Investment Servicing includes our acquisition of CRD. (2) Investment Servicing includes our acquisitions of the depositary bank and fund administrator activities of Fideuram Bank Luxembourg, a subsidiary of Intesa Sanpaolo, in the first quarter of 2021, with a total purchase price of approximately EUR 220 million or approximately $258 million, and our acquisition of Mercatus, Inc. in the third quarter of 2021, with a total purchase price of approximately $88 million. We accounted for these acquisitions as business combinations and, in accordance with ASC Topic 805, Business Combinations, we have recorded assets acquired and liabilities assumed at their respective fair values as of the acquisition date. The purchase price accounting reflected is provisional and is based upon estimates and assumptions that are subject to change within the measurement period (up to one year from the acquisition date pursuant to ASC 805). The measurement period remains open for both transactions pending the completion of valuation procedures related to the acquired assets and assumed liabilities, primarily identifiable intangible assets. The following table presents the gross carrying amount, accumulated amortization and net carrying amount of other intangible assets by type as of the dates indicated: September 30, 2021 Gross Accumulated Net (In millions) Other intangible assets: Client relationships $ 2,803 $ (1,464) $ 1,339 Technology 404 (133) 271 Core deposits 700 (444) 256 Other 103 (82) 21 Total $ 4,010 $ (2,123) $ 1,887 December 31, 2020 Gross Accumulated Net (In millions) Other intangible assets: Client relationships $ 2,704 $ (1,450) $ 1,254 Technology 393 (113) 280 Core deposits 690 (425) 265 Other 107 (79) 28 Total $ 3,894 $ (2,067) $ 1,827

Other Assets

Other Assets	9 Months Ended
	Sep. 30, 2021
Other Assets [Abstract]
Other Assets	Other Assets The following table presents the components of other assets as of the dates indicated: (In millions) September 30, 2021 December 31, 2020 Securities borrowed (1) $ 26,643 $ 18,330 Derivative instruments, net 7,565 5,804 Bank-owned life insurance 3,548 3,479 Investments in joint ventures and other unconsolidated entities 3,140 3,095 Collateral, net 1,348 2,616 Receivable for securities settlement 621 117 Right-of-use assets 612 720 Prepaid expenses 474 383 Accounts receivable 395 379 Income tax receivable 359 367 Deferred tax assets, net of valuation allowance (2) 196 233 Deposits with clearing organizations 62 58 Other (3) 988 929 Total $ 45,951 $ 36,510 (1) Refer to Note 8, for further information on the impact of collateral on our financial statement presentation of securities borrowing and securities lending transactions. (2) Deferred tax assets and liabilities recorded in our consolidated statement of condition are netted within the same tax jurisdiction. (3) Consists primarily of Advances of $532 million and $460 million as of September 30, 2021 and December 31, 2020, respectively.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments We use derivative financial instruments to support our clients' needs and to manage our interest rate and currency risks. These financial instruments consist of FX contracts such as forwards, futures and options contracts; interest rate contracts such as interest rate swaps (cross currency and single currency) and futures; and other derivative contracts. Derivative instruments used for risk management purposes that are highly effective in offsetting the risk being hedged are generally designated as hedging instruments in hedge accounting relationships, while others are economic hedges and not designated in hedge accounting relationships. For additional information on our use and accounting policies on derivative financial instruments, including derivatives not designated as hedging instruments, refer to pages 158 to 159 in Note 10 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. Derivatives Designated as Hedging Instruments For additional information on our derivatives designated as hedging instruments, including our risk management objectives and hedging documentation methodologies, refer to page 159 in Note 10 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. Fair Value Hedges Derivatives designated as fair value hedges are utilized to mitigate the risk of changes in the fair values of recognized assets and liabilities, including long-term debt and AFS securities. We use interest rate contracts in this manner to manage our exposure to changes in the fair value of hedged items caused by changes in interest rates. Changes in the fair value of the derivative and changes in fair value of the hedged item due to changes in the hedged risk are recognized in earnings in the same line item. If a hedge is terminated, but the hedged item was not derecognized, all remaining adjustments to the carrying amount of the hedged item are amortized over a period that is consistent with the amortization of other discounts or premiums associated with the hedged item . Cash Flow Hedges Derivatives designated as cash flow hedges are utilized to offset the variability of cash flows of recognized assets or liabilities or forecasted transactions. We have entered into FX contracts to hedge the change in cash flows attributable to FX movements in foreign currency denominated investment securities. Additionally, we have entered into interest rate swap agreements to hedge the forecasted cash flows associated with LIBOR indexed floating-rate loans. The interest rate swaps synthetically convert the loan interest receipts from a variable-rate to a fixed-rate, thereby mitigating the risk attributable to changes in the LIBOR benchmark rate. Changes in fair value of the derivatives designated as cash flow hedges are initially recorded in AOCI and then reclassified into earnings in the same period or periods during which the hedged forecasted transaction affects earnings and are presented in the same income statement line item as the earnings effect of the hedged item. If the hedge relationship is terminated, the change in fair value on the derivative recorded in AOCI is reclassified into earnings consistent with the timing of the hedged item. For hedge relationships that are discontinued because a forecasted transaction is not expected to occur according to the original hedge terms, any related derivative values recorded in AOCI are immediately recognized in earnings. The net gain associated with cash flow hedges expected to be reclassified from AOCI within 12 months of September 30, 2021, is approximately $70 million. The maximum length of time over which forecasted cash flows are hedged is 5 years. Net Investment Hedges Derivatives categorized as net investment hedges are entered into to protect the net investment in our foreign operations against adverse changes in exchange rates. We use FX forward contracts to convert the foreign currency risk to U.S. dollars to mitigate our exposure to fluctuations in FX rates. The changes in fair value of the FX forward contracts are recorded, net of taxes, in the foreign currency translation component of OCI. The following table presents the aggregate contractual, or notional, amounts of derivative financial instruments, including those entered into for trading and asset-and-liability management activities as of the dates indicated: (In millions) September 30, 2021 December 31, 2020 Derivatives not designated as hedging instruments: Interest rate contracts: Futures $ 3,572 $ 2,842 Foreign exchange contracts: Forward, swap and spot 2,372,570 2,640,989 Options purchased 724 946 Options written 221 661 Futures 2,077 1,980 Other: Stable value contracts (1) 32,704 32,359 Deferred value awards (2) 360 332 Derivatives designated as hedging instruments: Interest rate contracts: Swap agreements 13,714 7,449 Foreign exchange contracts: Forward and swap 6,877 5,221 (1) The notional value of the stable value contracts represents our maximum exposure. However, exposure to various stable value contracts is generally contractually limited to substantially lower amounts than the notional values. (2) Represents grants of deferred value awards to employees; refer to pages 158 to 159 in Note 10 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. Notional amounts are provided here as an indication of the volume of our derivative activity and serve as a reference to calculate the fair values of the derivative. The following table presents the fair value of derivative financial instruments, excluding the impact of master netting agreements, recorded in our consolidated statement of condition as of the dates indicated. The impact of master netting agreements is provided in Note 8. Derivative Assets (1) Derivative Liabilities (2) (In millions) September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Derivatives not designated as hedging instruments: Foreign exchange contracts $ 16,345 $ 25,939 $ 15,735 $ 25,811 Other derivative contracts — — 176 157 Total $ 16,345 $ 25,939 $ 15,911 $ 25,968 Derivatives designated as hedging instruments: Foreign exchange contracts $ 108 $ 4 $ — $ 116 Interest rate contracts 4 1 27 42 Total $ 112 $ 5 $ 27 $ 158 (1) Derivative assets are included within other assets in our consolidated statement of condition. (2) Derivative liabilities are included within other liabilities in our consolidated statement of condition. The following table presents the impact of our use of derivative financial instruments on our consolidated statement of income for the periods indicated: Location of Gain (Loss) on Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2021 2020 2021 2020 Derivatives not designated as hedging instruments: Foreign exchange contracts Foreign exchange trading services revenue $ 186 $ 164 $ 617 $ 712 Foreign exchange contracts Interest expense 16 20 53 39 Interest rate contracts Foreign exchange trading services revenue — — 1 3 Other derivative contracts Compensation and employee benefits (35) (39) (158) (151) Total $ 167 $ 145 $ 513 $ 603 The following table shows the carrying amount and associated cumulative basis adjustments related to the application of hedge accounting that is included in the carrying amount of hedged assets and liabilities in fair value hedging relationships: September 30, 2021 Cumulative Fair Value Hedging Adjustment Increasing (Decreasing) the carrying amount (In millions) Carrying Amount of Hedged Assets/Liabilities Active De-designated (1) Long-term debt $ 9,024 $ (14) $ 554 Available-for-sale securities 2,420 4 28 December 31, 2020 Cumulative Fair Value Hedging Adjustment Increasing (Decreasing) the carrying amount (In millions) Carrying Amount of Hedged Assets/Liabilities Active De-designated (1) Long-term debt $ 10,519 $ 3 $ 688 Available-for-sale securities 2,330 2 43 (1) Represents hedged items no longer designated in qualifying fair value hedging relationships for which an associated basis adjustment exists at the balance sheet date. As of September 30, 2021 and December 31, 2020, the total notional amount of the interest rate swaps of fair value hedges was $6.81 billion and $2.60 billion, respectively. The following tables present the impact of our use of derivative financial instruments on our consolidated statement of income for the periods indicated: Three Months Ended September 30, Three Months Ended September 30, 2021 2020 2021 2020 (In millions) Location of Gain (Loss) on Derivative in Consolidated Statement of Income Amount of Gain Hedged Item in Fair Value Hedging Relationship Location of Gain (Loss) on Hedged Item in Consolidated Statement of Income Amount of Gain Derivatives designated as fair value hedges: Interest rate contracts Net interest income $ 15 $ 5 Available-for-sale securities (1) Net interest income $ (17) $ (6) Interest rate contracts Net interest income (7) (19) Long-term debt Net interest income 8 17 Total $ 8 $ (14) $ (9) $ 11 Nine Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (In millions) Location of Gain (Loss) on Derivative in Consolidated Statement of Income Amount of Gain Hedged Item in Fair Value Hedging Relationship Location of Gain (Loss) on Hedged Item in Consolidated Statement of Income Amount of Gain Derivatives designated as fair value hedges: Interest rate contracts Net interest income $ 9 $ (3) Available-for-sale securities (2) Net interest income $ (12) $ — Interest rate contracts Net interest income (26) 564 Long-term debt Net interest income 26 (557) Total $ (17) $ 561 $ 14 $ (557) (1) In the three months ended September 30, 2021, approximately $13 million of net unrealized gains on AFS investment securities designated in fair value hedges was recognized in OCI compared to $4 million of net unrealized gains in the same period in 2020. (2) In the nine months ended September 30, 2021, approximately $9 million of net unrealized gains on AFS investment securities designated in fair value hedges was recognized in OCI compared to no net unrealized gains or losses in the same period in 2020. Three Months Ended September 30, Three Months Ended September 30, 2021 2020 Location of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income 2021 2020 (In millions) Amount of Gain or (Loss) Recognized in Other Comprehensive Income on Derivative Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income Derivatives designated as cash flow hedges: Interest rate contracts (1) $ (3) $ — Net interest income $ 22 $ 18 Foreign exchange contracts 12 (30) Net interest income 2 6 Total derivatives designated as cash flow hedges $ 9 $ (30) $ 24 $ 24 Derivatives designated as net investment hedges: Foreign exchange contracts $ 111 $ (122) Gains (Losses) related to investment securities, net $ — $ — Total derivatives designated as net investment hedges 111 (122) — — Total $ 120 $ (152) $ 24 $ 24 Nine Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (In millions) Amount of Gain or (Loss) Recognized in Other Comprehensive Income on Derivative Location of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income Derivatives designated as cash flow hedges: Interest rate contracts $ (9) 179 Net interest income $ 62 $ 32 Foreign exchange contracts 55 $ (11) Net interest income 8 20 Total derivatives designated as cash flow hedges $ 46 $ 168 $ 70 $ 52 Derivatives designated as net investment hedges: Foreign exchange contracts $ 222 $ (100) Gains (losses) related to investment securities, net $ — $ — Total derivatives designated as net investment hedges 222 (100) — — Total $ 268 $ 68 $ 70 $ 52 (1) As of September 30, 2021, the maximum maturity date of the underlying hedged items is approximately 5.0 years. Derivatives Netting and Credit Contingencies Netting Derivatives receivable and payable as well as cash collateral from the same counterparty are netted in the consolidated statement of condition for those counterparties with whom we have legally binding master netting agreements in place. In addition to cash collateral received and transferred presented on a net basis, we also receive and transfer collateral in the form of securities, which mitigate credit risk but are not eligible for netting. Additional information on netting is provided in Note 8. Credit Contingencies Certain of our derivatives are subject to master netting agreements with our derivative counterparties containing credit risk-related contingent features, which requires us to maintain an investment grade credit rating with the various credit rating agencies. If our rating falls below investment grade, we would be in violation of the provisions, and counterparties to the derivatives could request immediate payment or demand full overnight collateralization on derivatives instruments in net liability positions. The aggregate fair value of all derivatives with credit contingent features and in a liability position as of September 30, 2021 totaled approximately $4.76 billion, against which we provided $3.90 billion of collateral in the normal course of business. If our credit related contingent features underlying these agreements were triggered as of September 30, 2021, the maximum additional collateral we would be required to post to our counterparties is approximately $0.86 billion.

Offsetting Arrangements

Offsetting Arrangements	9 Months Ended
	Sep. 30, 2021
Offsetting [Abstract]
Offsetting Arrangements	Offsetting Arrangements For additional information on our offsetting arrangements, refer to page 163 in Note 11 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. As of September 30, 2021 and December 31, 2020, the value of securities received as collateral from third parties where we are permitted to transfer or re-pledge the securities totaled $1.97 billion and $6.48 billion, respectively, and the fair value of the portion that had been transferred or re-pledged as of the same dates was zero and $3.88 billion, respectively . The following tables present information about the offsetting of assets related to derivative contracts and secured financing transactions, as of the dates indicated: Assets: September 30, 2021 Gross Amounts of Recognized Assets (1)(2) Gross Amounts Offset in Statement of Condition (3) Net Amounts of Assets Presented in Statement of Condition Gross Amounts Not Offset in Statement of Condition (In millions) Cash and Securities Received (4) Net Amount (5) Derivatives: Foreign exchange contracts $ 16,453 $ (7,667) $ 8,786 $ — $ 8,786 Interest rate contracts (6) 4 — 4 — 4 Cash collateral and securities netting NA (1,225) (1,225) (1,086) (2,311) Total derivatives 16,457 (8,892) 7,565 (1,086) 6,479 Other financial instruments: Resale agreements and securities borrowing (7)(8) 87,099 (57,609) 29,490 (29,242) 248 Total derivatives and other financial instruments $ 103,556 $ (66,501) $ 37,055 $ (30,328) $ 6,727 Assets: December 31, 2020 Gross Amounts of Recognized Assets (1)(2) Gross Amounts Offset in Statement of Condition (3) Net Amounts of Assets Presented in Statement of Condition Gross Amounts Not Offset in Statement of Condition (In millions) Cash and Securities Received (4) Net Amount (5) Derivatives: Foreign exchange contracts $ 25,943 $ (14,271) $ 11,672 $ — $ 11,672 Interest rate contracts (6) 1 — 1 — 1 Cash collateral and securities netting NA (5,869) (5,869) (1,105) (6,974) Total derivatives 25,944 (20,140) 5,804 (1,105) 4,699 Other financial instruments: Resale agreements and securities borrowing (7)(8) 174,461 (153,025) 21,436 (20,568) 868 Total derivatives and other financial instruments $ 200,405 $ (173,165) $ 27,240 $ (21,673) $ 5,567 (1) Amounts include all transactions regardless of whether or not they are subject to an enforceable netting arrangement. (2) Refer to Note 1 and Note 2 for additional information about the measurement basis of derivative instruments. (3) Amounts subject to netting arrangements which have been determined to be legally enforceable and eligible for netting in the consolidated statement of condition. (4) Includes securities in connection with our securities borrowing transactions. (5) Includes amounts secured by collateral not determined to be subject to enforceable netting arrangements. (6) Variation margin payments presented as settlements rather than collateral. (7) Included in the $29.49 billion as of September 30, 2021 were $2.85 billion of resale agreements and $26.64 billion of collateral provided related to securities borrowing. Included in the $21.44 billion as of December 31, 2020 were $3.11 billion of resale agreements and $18.33 billion of collateral provided related to securities borrowing. Resale agreements and collateral provided related to securities borrowing were recorded in securities purchased under resale agreements and other assets, respectively, in our consolidated statement of condition. Refer to Note 9 for additional information with respect to principal securities finance transactions. (8) Offsetting of resale agreements primarily relates to our involvement in FICC, where we settle transactions on a net basis for payment and delivery through the Fedwire system. NA Not applicable The following tables present information about the offsetting of liabilities related to derivative contracts and secured financing transactions, as of the dates indicated: Liabilities: September 30, 2021 Gross Amounts of Recognized Liabilities (1)(2) Gross Amounts Offset in Statement of Condition (3) Net Amounts of Liabilities Presented in Statement of Condition Gross Amounts Not Offset in Statement of Condition (In millions) Cash and Securities Received (4) Net Amount (5) Derivatives: Foreign exchange contracts $ 15,735 $ (7,663) $ 8,072 $ — $ 8,072 Interest rate contracts (6) 27 (4) 23 — 23 Other derivative contracts 176 — 176 — 176 Cash collateral and securities netting NA (3,956) (3,956) (1,269) (5,225) Total derivatives 15,938 (11,623) 4,315 (1,269) 3,046 Other financial instruments: Repurchase agreements and securities lending (7)(8) 66,016 (57,609) 8,407 (7,802) 605 Total derivatives and other financial instruments $ 81,954 $ (69,232) $ 12,722 $ (9,071) $ 3,651 Liabilities: December 31, 2020 Gross Amounts of Recognized Liabilities (1)(2) Gross Amounts Offset in Statement of Condition (3) Net Amounts of Liabilities Presented in Statement of Condition Gross Amounts Not Offset in Statement of Condition (In millions) Cash and Securities Received (4) Net Amount (5) Derivatives: Foreign exchange contracts $ 25,927 $ (14,271) $ 11,656 $ — $ 11,656 Interest rate contracts (6) 42 — 42 — 42 Other derivative contracts 157 — 157 — 157 Cash collateral and securities netting NA (1,287) (1,287) (1,732) (3,019) Total derivatives 26,126 (15,558) 10,568 (1,732) 8,836 Other financial instruments: Repurchase agreements and securities lending (7)(8) 165,793 (153,025) 12,768 (12,448) 320 Total derivatives and other financial instruments $ 191,919 $ (168,583) $ 23,336 $ (14,180) $ 9,156 (1) Amounts include all transactions regardless of whether or not they are subject to an enforceable netting arrangement. (2) Refer to Note 1 and Note 2 for additional information about the measurement basis of derivative instruments. (3) Amounts subject to netting arrangements which have been determined to be legally enforceable and eligible for netting in the consolidated statement of condition. (4) Includes securities provided in connection with our securities lending transactions. (5) Includes amounts secured by collateral not determined to be subject to enforceable netting arrangements. (6) Variation margin payments presented as settlements rather than collateral. (7) Included in the $8.41 billion as of September 30, 2021 were $0.64 billion of repurchase agreements and $7.77 billion of collateral received related to securities lending transactions. Included in the $12.77 billion as of December 31, 2020 were $3.41 billion of repurchase agreements and $9.36 billion of collateral received related to securities lending transactions. Repurchase agreements and collateral received related to securities lending were recorded in securities sold under repurchase agreements and accrued expenses and other liabilities, respectively, in our consolidated statement of condition. Refer to Note 9 for additional information with respect to principal securities finance transactions. (8) Offsetting of repurchase agreements primarily relates to our involvement in FICC, where we settle transactions on a net basis for payment and delivery through the Fedwire system. NA Not applicable The securities transferred under resale and repurchase agreements typically are U.S. Treasury, agency and agency MBS. In our principal securities borrowing and lending arrangements, the securities transferred are predominantly equity securities and some corporate debt securities. The fair value of the securities transferred may increase in value to an amount greater than the amount received under our repurchase and securities lending arrangements, which exposes us to counterparty risk. We require the review of the price of the underlying securities in relation to the carrying value of the repurchase agreements and securities lending arrangements on a daily basis and when appropriate, adjust the cash or security to be obtained or returned to counterparties that is reflective of the required collateral levels. The following table summarizes our repurchase agreements and securities lending transactions by category of collateral pledged and remaining maturity of these agreements as of the periods indicated: As of September 30, 2021 As of December 31, 2020 (In millions) Overnight and Continuous Up to 30 Days 30-90 days Greater than 90 Days Total Overnight and Continuous Up to 30 Days 30-90 days Greater than 90 Days Total Repurchase agreements: U.S. Treasury and agency securities $ 53,915 $ — $ — $ — $ 53,915 $ 152,140 $ — $ — $ — $ 152,140 Total 53,915 — — — 53,915 152,140 — — — 152,140 Securities lending transactions: US Treasury and agency securities 2 — — — 2 — — — — — Corporate debt securities 149 — — — 149 110 — — — 110 Equity securities 9,876 54 3 2,016 11,949 7,578 56 1,156 8,790 Other (1) 1 — — — 1 4,753 — — — 4,753 Total 10,028 54 3 2,016 12,101 12,441 56 — 1,156 13,653 Gross amount of recognized liabilities for repurchase agreements and securities lending $ 63,943 $ 54 $ 3 $ 2,016 $ 66,016 $ 164,581 $ 56 $ — $ 1,156 $ 165,793 (1) Represents a security interest in underlying client assets related to our enhanced custody business, which assets clients have allowed us to transfer and re-pledge.

Commitments and Guarantees

Commitments and Guarantees	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Guarantees	Commitments and Guarantees For additional information on the nature of the obligations and related business activities for our commitments and guarantees, refer to page 166 in Note 12 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. The following table presents the aggregate gross contractual amounts of our off-balance sheet commitments and off-balance sheet guarantees as of the dates indicated: (In millions) September 30, 2021 December 31, 2020 Commitments: Unfunded credit facilities $ 34,471 $ 34,213 Guarantees (1) : Indemnified securities financing $ 402,369 $ 440,875 Standby letters of credit 3,333 3,330 (1) The potential losses associated with these guarantees equal the gross contractual amounts and do not consider the value of any collateral or reflect any participations to independent third parties. Approximately 73% of our unfunded commitments to extend credit expire within one year as of both September 30, 2021 and December 31, 2020. Indemnified Securities Financing For additional information on our indemnified securities financing, refer to page 166 in Note 12 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. The following table summarizes the aggregate fair values of indemnified securities financing and related collateral, as well as collateral invested in indemnified repurchase agreements, as of the dates indicated: (In millions) September 30, 2021 December 31, 2020 Fair value of indemnified securities financing $ 402,369 $ 440,875 Fair value of cash and securities held by us, as agent, as collateral for indemnified securities financing 422,882 463,273 Fair value of collateral for indemnified securities financing invested in indemnified repurchase agreements 67,833 54,432 Fair value of cash and securities held by us or our agents as collateral for investments in indemnified repurchase agreements 73,176 58,092 In certain cases, we participate in securities finance transactions as a principal. As a principal, we borrow securities from the lending client and then lend such securities to the subsequent borrower, either our client or a broker/dealer. Our right to receive and obligation to return collateral in connection with our securities lending transactions are recorded in other assets and other liabilities, respectively, in our consolidated statement of condition. As of September 30, 2021 and December 31, 2020, we had approximately $26.64 billion and $18.33 billion, respectively, of collateral provided and approximately $7.77 billion and $9.36 billion, respectively, of collateral received from clients in connection with our participation in principal securities finance transactions. FICC Guarantee As a sponsoring member in the FICC member program, we provide a guarantee to FICC in the event a customer fails to perform its obligations under a transaction. In order to minimize the risk associated with this guarantee, sponsored members acting as buyers generally grant a security interest in the subject securities received under and held on their behalf by State Street. For additional information on our repurchase and reverse repurchase agreements, please refer to Note 8 to the consolidated financial statements in this Form 10-Q.

Contingencies

Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Legal and Regulatory Matters In the ordinary course of business, we and our subsidiaries are involved in disputes, litigation, and governmental or regulatory inquiries and investigations, both pending and threatened. These matters, if resolved adversely against us or settled, may result in monetary awards or payments, fines and penalties or require changes in our business practices. The resolution or settlement of these matters is inherently difficult to predict. Based on our assessment of these pending matters, we do not believe that the amount of any judgment, settlement or other action arising from any pending matter is likely to have a material adverse effect on our consolidated financial condition. However, an adverse outcome or development in certain of the matters described below could have a material adverse effect on our consolidated results of operations for the period in which such matter is resolved, or an accrual is determined to be required, on our consolidated financial condition, or on our reputation. We evaluate our needs for accruals of loss contingencies related to legal and regulatory proceedings on a case-by-case basis. When we have a liability that we deem probable, and we deem the amount of such liability can be reasonably estimated as of the date of our consolidated financial statements, we accrue our estimate of the amount of loss. We also consider a loss probable and establish an accrual when we make, or intend to make, an offer of settlement. Once established, an accrual is subject to subsequent adjustment as a result of additional information. The resolution of legal and regulatory proceedings and the amount of reasonably estimable loss (or range thereof) are inherently difficult to predict, especially in the early stages of proceedings. Even if a loss is probable, an amount (or range) of loss might not be reasonably estimated until the later stages of the proceeding due to many factors such as the presence of complex or novel legal theories, the discretion of governmental authorities in seeking sanctions or negotiating resolutions in civil and criminal matters, the pace and timing of discovery and other assessments of facts and the procedural posture of the matter (collectively, "factors influencing reasonable estimates"). As of September 30, 2021, our aggregate accruals for loss contingencies for legal, regulatory and related matters totaled approximately $19 million, including potential fines by government agencies and civil litigation with respect to the matters specifically discussed below. To the extent that we have established accruals in our consolidated statement of condition for probable loss contingencies, such accruals may not be sufficient to cover our ultimate financial exposure associated with any settlements or judgments. Any such ultimate financial exposure, or proceedings to which we may become subject in the future, could have a material adverse effect on our businesses, on our future consolidated financial statements or on our reputation. As of September 30, 2021, for those matters for which we have accrued probable loss contingencies (including the Invoicing Matter described below) and for other matters for which loss is reasonably possible (but not probable) in future periods, and for which we are able to estimate a range of reasonably possible loss, our estimate of the aggregate reasonably possible loss (in excess of any accrued amounts) ranges up to approximately $45 million. Our estimate with respect to the aggregate reasonably possible loss is based upon currently available information and is subject to significant judgment and a variety of assumptions and known and unknown uncertainties, which may change quickly and significantly from time to time, particularly if and as we engage with applicable governmental agencies or plaintiffs in connection with a proceeding. Also, the matters underlying the reasonably possible loss will change from time to time. As a result, actual results may vary significantly from the current estimate. In certain pending matters, it is not currently feasible to reasonably estimate the amount or a range of reasonably possible loss, and such losses, which may be significant, are not included in the estimate of reasonably possible loss discussed above. This is due to, among other factors, the factors influencing reasonable estimates described above. An adverse outcome in one or more of the matters for which we have not estimated the amount or a range of reasonably possible loss, individually or in the aggregate, could have a material adverse effect on our businesses, on our future consolidated financial statements or on our reputation. Given that our actual losses from any legal or regulatory proceeding for which we have provided an estimate of the reasonably possible loss could significantly exceed such estimate, and given that we cannot estimate reasonably possible loss for all legal and regulatory proceedings as to which we may be subject now or in the future, no conclusion as to our ultimate exposure from current pending or potential legal or regulatory proceedings should be drawn from the current estimate of reasonably possible loss. The following discussion provides information with respect to significant legal, governmental and regulatory matters. Invoicing Matter In 2015, we determined that we had incorrectly invoiced clients for certain expenses. We have reimbursed most of our affected customers for those expenses, and we have implemented enhancements to our billing processes. In connection with our enhancements to our billing processes, we continue to review historical billing practices and may from time to time identify additional remediation. In 2017, we identified an additional area of incorrect expense billing associated with mailing services in our retirement services business. We currently expect the cumulative total of our payments to customers for these invoicing errors, including the error in the retirement services business, to be at least $360 million, all of which has been paid or is accrued. However, we may identify additional remediation costs. In March 2017, a purported class action was commenced against us alleging that our invoicing practices violated duties owed to retirement plan customers under the Employee Retirement Income Security Act. We have agreed, subject to court approval, to resolve this matter and pay a cost that is within our established accruals for loss contingencies. In addition, we have received a purported class action demand letter alleging that our invoicing practices were unfair and deceptive under Massachusetts law. A class of customers, or particular customers, may assert that we have not paid to them all amounts incorrectly invoiced, and may seek double or treble damages under Massachusetts law. We have agreed with the office of the United States Attorney for the District of Massachusetts to resolve potential criminal claims arising from these matters by entering into a deferred prosecution agreement and paying a $115 million penalty in May 2021. In June 2019, we reached an agreement with the SEC to settle its claims that we violated the recordkeeping provisions of Section 34(b) of the Investment Company Act of 1940 and caused violations of Section 31(a) of the Investment Company Act and Rules 31a-1(a) and 31a-1(b) thereunder in connection with our overcharges of customers which are registered investment companies. In reaching this settlement, we neither admitted nor denied the claims contained in the SEC’s order, and agreed to pay a civil monetary penalty of $40 million. Also in June 2019, we reached an agreement with the Massachusetts Attorney General’s office to resolve its claims related to this matter. In reaching this settlement, we neither admitted nor denied the claims in the order, and agreed to pay a civil monetary penalty of $5.5 million. The SEC and Massachusetts Attorney General’s office settlements both recognize that the payment of $48.8 million in disgorgement and interest is satisfied by our direct reimbursements of our customers. We paid fines to resolve claims of the Securities Divisions of the Secretaries of the State of Massachusetts and New Hampshire. The costs associated with the settlements discussed above were within our related previously established accruals for loss contingencies. We have not resolved certain claims that may be made by the U.S. Department of Labor. We do not know whether any such claims will be brought, and there can be no assurance that any settlement of any such claims will be reached on financial terms acceptable to us or at all. The aggregate amount of penalties that may potentially be imposed upon us in connection with the resolution of any such matters is not currently known. Shareholder Litigation A shareholder of ours filed a derivative complaint against certain of the Company’s past and present officers and directors to recover alleged losses incurred by the Company relating to the invoicing matter and to the Ohio public retirement plans matter. The Suffolk Superior Court Department of the Trial Court of the Commonwealth of Massachusetts, without objection, approved a settlement of the claim in which we agreed to take, or to continue to take, specified steps to improve our ongoing governance and compliance policies, and to pay a fee to plaintiff's counsel. Gomes, et al. v. State Street Corp. Eight participants in our Salary Savings Program filed a purported class action complaint in May 2021 on behalf of participants and beneficiaries who participated in the Program and invested in our proprietary investment fund options between May 2015 and the present. The complaint names the Plan Sponsor as well as the committees overseeing the Plan and their respective members as defendants, and alleges breach of fiduciary duty and violations of other duties owed to retirement plan participants under the Employee Retirement Income and Security Act. We and the other named defendants deny the alleged claims and are proceeding with a defense of the matter. Edmar Financial Company, LLC et al v. Currenex, Inc. et al In August 2021, two former Currenex clients filed a putative civil class action lawsuit in the Southern District of New York alleging antitrust violations, fraud and a civil Racketeer Influenced and Corrupt Organization Act violation against Currenex, State Street and others. Income Taxes In determining our provision for income taxes, we make certain judgments and interpretations with respect to tax laws in jurisdictions in which we have business operations. Because of the complex nature of these laws, in the normal course of our business, we are subject to challenges from U.S. and non-U.S. income tax authorities regarding the amount of income taxes due. These challenges may result in adjustments to the timing or amount of taxable income or deductions or the allocation of taxable income among tax jurisdictions. We recognize a tax benefit when it is more likely than not that our position will result in a tax deduction or credit. Unrecognized tax benefits of approximately $295 million as of September 30, 2021 decreased from $308 million as of December 31, 2020. We are presently under audit by a number of tax authorities, and the Internal Revenue Service is currently reviewing our U.S. income tax returns, including amended returns, for tax years 2014-2018. The earliest tax year open to examination in jurisdictions where we have material operations is 2013. Management believes that we have sufficiently accrued liabilities as of September 30, 2021 for potential tax exposures.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	Variable Interest Entities For additional information on our accounting policy and our use of variable interest entities (VIEs), refer to pages 169 to 170 in Note 14 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, "Variable Interest Entities", in our 2020 Form 10-K. Tax-Exempt Investment Program In the normal course of our business, we structure and sell certificated interests in pools of tax-exempt investment grade assets, principally to our mutual fund clients. We structure these pools as partnership trusts, and the assets and liabilities of the trusts are recorded in our consolidated statement of condition as AFS investment securities and other short-term borrowings. As of September 30, 2021 and December 31, 2020, we carried AFS investment securities, composed of securities related to state and political subdivisions, with a fair value of $0.61 billion and $0.70 billion, respectively, and other short-term borrowings of $0.43 billion and $0.62 billion, respectively, in our consolidated statement of condition in connection with these trusts. The interest income and interest expense generated by the investments and certificated interests, respectively, are recorded as components of NII when earned or incurred. The trusts had a weighted-average life of approximately 2.2 years as of September 30, 2021, compared to approximately 2.7 years as of December 31, 2020. Interests in Investment Funds As of September 30, 2021, we had no consolidated funds. As of December 31, 2020, the aggregate assets and liabilities of our consolidated sponsored investment funds totaled $17 million and $4 million, respectively. As of December 31, 2020, our maximum total exposure associated with the consolidated sponsored investment funds totaled $13 million, and represented the value of our economic ownership interest in the funds. As of September 30, 2021 and December 31, 2020, we managed certain funds, considered VIEs, in which we held a variable interest but for which we were not deemed to be the primary beneficiary. Our potential maximum loss exposure related to these unconsolidated funds totaled $11 million and $22 million as of September 30, 2021 and December 31, 2020, respectively, and represented the carrying value of our investments, which are recorded in other assets in our consolidated statement of condition. The amount of loss we may recognize during any period is limited to the carrying amount of our investments in the unconsolidated funds.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Shareholders' Equity	Shareholders' Equity Preferred Stock The following table summarizes selected terms of each of the series of the preferred stock issued and outstanding as of September 30, 2021: Preferred Stock (1) : Issuance Date Depositary Shares Issued Amount outstanding (in millions) Ownership Interest Per Depositary Share Liquidation Preference Per Share Liquidation Preference Per Depositary Share Per Annum Dividend Rate Dividend Payment Frequency Carrying Value as of September 30, 2021 Redemption Date (2) Series D February 2014 30,000,000 $ 750 1/4,000th $ 100,000 $ 25 5.90% to but excluding March 15, 2024, then a floating rate equal to the three-month LIBOR plus 3.108% Quarterly $ 742 March 15, 2024 Series F (3) May 2015 250,000 250 1/100th 100,000 1,000 5.25% to but excluding September 15, 2020, then a floating rate equal to the three-month LIBOR plus 3.597%, or 3.7130% effective September 15, 2021 Quarterly 247 September 15, 2020 Series G April 2016 20,000,000 500 1/4,000th 100,000 25 5.35% to but excluding March 15, 2026, then a floating rate equal to the three-month LIBOR plus 3.709% Quarterly 493 March 15, 2026 Series H September 2018 500,000 500 1/100th 100,000 1,000 5.625% to but excluding December 15, 2023, then a floating rate equal to the three-month LIBOR plus 2.539% Semi-annually 494 December 15, 2023 (1) The preferred stock and corresponding depositary shares may be redeemed at our option in whole, but not in part, prior to the redemption date upon the occurrence of a regulatory capital treatment event, as defined in the certificate of designation, at a redemption price equal to the liquidation price per share and liquidation price per depositary share plus any declared and unpaid dividends, without accumulation of any undeclared dividends. (2) On the redemption date, or any dividend payment date thereafter, the preferred stock and corresponding depositary shares may be redeemed by us, in whole or in part, at the liquidation price per share and liquidation price per depositary share plus any declared and unpaid dividends, without accumulation of any undeclared dividends. (3) Series F preferred stock is redeemable on September 15, 2020 and on each succeeding dividend payment date. We did not elect redemption on September 15, 2020, December 15, 2020, June 15, 2021 or September 15, 2021. On March 15, 2021, we redeemed an aggregate of $500 million, or 5,000 of the 7,500 outstanding shares of our non-cumulative perpetual preferred stock, Series F, for cash at a redemption price of $100,000 per share (equivalent to $1,000 per depositary share) plus all declared and unpaid dividends. The following table presents the dividends declared for each of the series of preferred stock issued and outstanding for the periods indicated: Three Months Ended September 30, 2021 2020 (Dollars in millions, except per share amounts) Dividends Declared per Share Dividends Declared per Depositary Share Total Dividends Declared per Share Dividends Declared per Depositary Share Total Preferred Stock: Series D $ 1,475 $ 0.37 $ 11 $ 1,475 $ 0.37 $ 11 Series F 950 9.50 2 2,625 26.25 20 Series G 1,338 0.33 7 1,338 0.33 7 Series H — — — — — — Total $ 20 $ 38 Nine Months Ended September 30, 2021 2020 (Dollars in millions, except per share amounts) Dividends Declared per Share Dividends Declared per Depositary Share Total Dividends Declared per Share Dividends Declared per Depositary Share Total Preferred Stock: Series C $ — $ — $ — $ 1,313 $ 0.33 $ 6 Series D 4,425 1.11 33 4,425 1.11 33 Series F 2,869 28.69 11 5,250 52.50 40 Series G 4,014 0.99 21 4,014 0.99 21 Series H 2,813 28.13 14 2,813 28.13 14 Total $ 79 $ 114 In October 2021, we declared dividends on our series D, F, G and H preferred stock of approximately $1,475, $939, $1,338 and $2,813, respectively, per share, or approximately $0.37, $9.39, $0.33 and $28.13, respectively, per depositary share. These dividends total approximately $11 million, $2 million, $7 million and $14 million on our series D, F, G and H preferred stock, respectively, which will be paid in December 2021. Common Stock In September 2021, we completed a public offering of approximately 21.7 million shares of our common stock. The offering price was $87.60 per share and net proceeds totaled approximately $1.9 billion. We expect to use these net proceeds to finance our proposed acquisition of the BBH Investor Services business. In June 2019, our Board approved a common share repurchase program authorizing the repurchase of up to $2.0 billion of our common stock from July 1, 2019 through June 30, 2020 (the 2019 Program). We repurchased $500 million of our common stock in each of the third and fourth quarters of 2019 and the first quarter of 2020 under the 2019 Program. On March 16, 2020, we, along with the other U.S. G-SIBs, suspended common share repurchases and maintained this suspension through the fourth quarter of 2020 in response to the COVID-19 pandemic. This suspension was consistent with limitations imposed by the Federal Reserve beginning in the second quarter of 2020. As a result, we had no repurchases of our common stock in the second, third or fourth quarters of 2020. In December 2020, the Federal Reserve issued results of 2020 resubmission stress tests and authorized us to continue to pay common stock dividends at current levels and to resume repurchasing common shares in the first quarter of 2021. In January 2021, our Board authorized a share repurchase program for the repurchase of up to $475 million of our common stock through March 31, 2021. In April 2021, our Board authorized a share repurchase program for the repurchase of up to $425 million of our common stock through June 30, 2021, consistent with the limit set by the Federal Reserve. In July 2021, our Board authorized a share repurchase program for the repurchase of up to $3.0 billion of our common stock through the end of 2022. In connection with our proposed acquisition of the BBH Investor Services business, we did not purchase any common stock during the third quarter of 2021 under the common share repurchase plan approved by our Board in July 2021, and we do not intend to repurchase any common stock during the fourth quarter of 2021 and the first quarter of 2022. We intend to resume our common share repurchases during the second quarter of 2022. The tables below present the activity under our common share repurchase program for the periods indicated: Three Months Ended September 30, 2021 Nine Months Ended September 30, 2021 Shares Acquired Average Cost per Share Total Acquired Shares Acquired (In millions) Average Cost per Share Total Acquired (In millions) — $ — $ — 11.2 $ 80.00 $ 900 Three Months Ended September 30, 2020 Nine Months Ended September 30, 2020 Shares Acquired Average Cost per Share Total Acquired Shares Acquired (In millions) Average Cost per Share Total Acquired (In millions) 2019 Program — $ — $ — 6.5 $ 77.35 $ 500 The table below presents the dividends declared on common stock for the periods indicated: Three Months Ended September 30, 2021 2020 Dividends Declared per Share Total (In millions) Dividends Declared per Share Total (In millions) Common Stock $ 0.57 $ 209 $ 0.52 $ 184 Nine Months Ended September 30, 2021 2020 Dividends Declared per Share Total (In millions) Dividends Declared per Share Total (In millions) Common Stock $ 1.61 $ 570 $ 1.56 $ 550 Accumulated Other Comprehensive Income (Loss) The following table presents the after-tax components of AOCI for the periods indicated: Nine Months Ended September 30, (In millions) 2021 2020 Net unrealized gains (losses) on cash flow hedges $ 41 $ 82 Net unrealized gains (losses) on available-for-sale securities portfolio 353 976 Net unrealized gains (losses) related to reclassified available-for-sale securities (39) (68) Net unrealized gains (losses) on available-for-sale securities 314 908 Net unrealized (losses) on available-for-sale securities designated in fair value hedges (24) (36) Net unrealized gains (losses) on hedges of net investments in non-U.S. subsidiaries 18 (54) Other-than-temporary impairment on held-to-maturity securities related to factors other than credit (2) (2) Net unrealized (losses) on retirement plans (166) (172) Foreign currency translation (863) (837) Total $ (682) $ (111) The following table presents changes in AOCI by component, net of related taxes, for the periods indicated: (In millions) Net Unrealized Gains (Losses) on Cash Flow Hedges Net Unrealized Gains (Losses) on Available-for-Sale Securities Net Unrealized Gains (Losses) on Hedges of Net Investments in Non-U.S. Subsidiaries Other-Than-Temporary Impairment on Held-to-Maturity Securities Net Unrealized Losses on Retirement Plans Foreign Currency Translation Total Balance as of December 31, 2020 $ 57 $ 848 $ (204) $ (2) $ (178) $ (334) $ 187 Other comprehensive income (loss) before reclassifications 35 (558) 222 — — (529) (830) Amounts reclassified into (out of) accumulated other comprehensive loss (51) — — — 12 — (39) Other comprehensive income (loss) (16) (558) 222 — 12 (529) (869) Balance as of September 30, 2021 $ 41 $ 290 $ 18 $ (2) $ (166) $ (863) $ (682) (In millions) Net Unrealized Gains (Losses) on Cash Flow Hedges Net Unrealized Gains (Losses) on Available-for-Sale Securities Net Unrealized Gains (Losses) on Hedges of Net Investments in Non-U.S. Subsidiaries Other-Than-Temporary Impairment on Held-to-Maturity Securities Net Unrealized Losses on Retirement Plans Foreign Currency Translation Total Balance as of December 31, 2019 $ (70) $ 409 $ 46 $ (2) $ (187) $ (1,072) $ (876) Other comprehensive income (loss) before reclassifications 189 462 (100) — — 235 786 Amounts reclassified into (out of) accumulated other comprehensive loss (37) 1 — — 15 — (21) Other comprehensive income (loss) 152 463 (100) — 15 235 765 Balance as of September 30, 2020 $ 82 $ 872 $ (54) $ (2) $ (172) $ (837) $ (111) The following table presents after-tax reclassifications into earnings for the periods indicated: Three Months Ended September 30, 2021 2020 (In millions) Amounts Reclassified (into) Affected Line Item in Consolidated Statement of Income Cash flow hedges: (Gain) reclassified from accumulated other comprehensive income into income, net of related taxes of $6 and $7, respectively $ (18) $ (17) Net interest income reclassified from other comprehensive income Retirement plans: Amortization of actuarial losses, net of related taxes of $1 and $1, respectively 2 1 Compensation and employee benefits expenses Total reclassifications into (out of) Accumulated other comprehensive loss $ (16) $ (16) Nine Months Ended September 30, 2021 2020 (In millions) Amounts Reclassified (into) Affected Line Item in Consolidated Statement of Income Available-for-sale securities: Net realized gains (losses) from sales of available-for-sale securities, net of related taxes of $0 and $1, respectively $ — $ 1 Net gains (losses) from sales of available-for-sale securities Cash flow hedges: (Gain) reclassified from accumulated other comprehensive income into income, net of related taxes of $19 and $14, respectively (51) (37) Net interest income reclassified from other comprehensive income Retirement plans: Amortization of actuarial losses, net of related taxes of $5 and $5, respectively 12 15 Compensation and employee benefits expenses Total reclassifications into (out of) Accumulated other comprehensive loss $ (39) $ (21)

Regulatory Capital

Regulatory Capital	9 Months Ended
	Sep. 30, 2021
Banking and Thrift, Other Disclosures [Abstract]
Regulatory Capital	Regulatory Capital For additional information on our regulatory capital, including the regulatory capital requirements administered by federal banking agencies, and to which we are subject, refer to page 174 in Note 16 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. As of September 30, 2021, we and State Street Bank exceeded all regulatory capital adequacy requirements to which we were subject to. As of September 30, 2021, State Street Bank was categorized as “well capitalized” under the applicable regulatory capital adequacy framework, and exceeded all “well capitalized” ratio guidelines to which it was subject. Management believes that no conditions or events have occurred since September 30, 2021 that have changed the capital categorization of State Street Bank. 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 September 30, 2021 Basel III Standardized Approach September 30, 2021 Basel III Advanced Approaches December 31, 2020 Basel III Standardized Approach December 31, 2020 Basel III Advanced Approaches September 30, 2021 Basel III Standardized Approach September 30, 2021 Basel III Advanced Approaches December 31, 2020 Basel III Standardized Approach December 31, 2020 Common shareholders' equity: Common stock and related surplus $ 11,267 $ 11,267 $ 10,709 $ 10,709 $ 12,887 $ 12,887 $ 12,893 $ 12,893 Retained earnings 24,785 24,785 23,442 23,442 14,919 14,919 12,939 12,939 Accumulated other comprehensive income (loss) (682) (682) 187 187 (465) (465) 371 371 Treasury stock, at cost (10,032) (10,032) (10,609) (10,609) — — — — Total 25,338 25,338 23,729 23,729 27,341 27,341 26,203 26,203 Regulatory capital adjustments: Goodwill and other intangible assets, net of associated deferred tax liabilities (9,040) (9,040) (9,019) (9,019) (8,770) (8,770) (8,745) (8,745) Other adjustments (1) (467) (467) (333) (333) (281) (281) (152) (152) Common equity tier 1 capital 15,831 15,831 14,377 14,377 18,290 18,290 17,306 17,306 Preferred stock 1,976 1,976 2,471 2,471 — — — — Tier 1 capital 17,807 17,807 16,848 16,848 18,290 18,290 17,306 17,306 Qualifying subordinated long-term debt 1,590 1,590 961 961 754 754 966 966 Allowance for credit losses — 117 1 148 — 117 10 148 Total capital $ 19,397 $ 19,514 $ 17,810 $ 17,957 $ 19,044 $ 19,161 $ 18,282 $ 18,420 Risk-weighted assets: Credit risk (2) $ 66,503 $ 114,604 $ 63,367 $ 114,892 $ 59,635 $ 111,464 $ 58,960 $ 110,797 Operational risk (3) 45,750 NA 44,150 NA 43,113 NA 43,663 NA Market risk 2,625 2,625 2,188 2,188 2,625 2,625 2,188 2,188 Total risk-weighted assets $ 114,878 $ 117,229 $ 109,705 $ 117,080 $ 105,373 $ 114,089 $ 104,811 $ 112,985 Adjusted quarterly average assets $ 281,952 $ 281,952 $ 263,490 $ 263,490 $ 278,705 $ 278,705 $ 260,489 $ 260,489 Capital Ratios: 2021 Minimum Requirements (4) 2020 Minimum Requirements (4) Common equity tier 1 capital 8.0 % 8.0 % 13.8 % 13.5 % 13.1 % 12.3 % 17.4 % 16.0 % 16.5 % 15.3 % Tier 1 capital 9.5 9.5 15.5 15.2 15.4 14.4 17.4 16.0 16.5 15.3 Total capital 11.5 11.5 16.9 16.6 16.2 15.3 18.1 16.8 17.4 16.3 Tier 1 leverage (5) 4.0 4.0 6.3 6.3 6.4 6.4 6.6 6.6 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) Includes a CVA which reflects the risk of potential fair value adjustments for credit risk reflected in our valuation of 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. 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%. State Street Bank is required to maintain a minimum Tier 1 leverage ratio of 5.0% as it is the insured depository institution subsidiary of State Street Corporation, a U.S. G-SIB. NA Not applicable

Net Interest Income

Net Interest Income	9 Months Ended
	Sep. 30, 2021
Banking and Thrift, Interest [Abstract]
Net Interest Income	Net Interest Income The following table presents the components of interest income and interest expense, and related NII, for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2021 2020 2021 2020 Interest income: Interest-bearing deposits with banks $ — $ (6) $ (13) $ 79 Investment securities: Investment securities available-for-sale 150 169 435 609 Investment securities held-to-maturity 158 171 501 631 Investment securities purchased under money market liquidity facility — 25 4 103 Total investment securities 308 365 940 1,343 Securities purchased under resale agreements 6 20 19 109 Loans 168 138 466 479 Other interest-earning assets 5 3 13 52 Total interest income 487 520 1,425 2,062 Interest expense: Interest-bearing deposits (62) (61) (196) (47) Short-term borrowings under money market liquidity facility — 23 4 87 Securities sold under repurchase agreements — — — 3 Other short-term borrowings — 2 1 17 Long-term debt 51 69 165 252 Other interest-bearing liabilities 11 9 30 49 Total interest expense — 42 4 361 Net interest income $ 487 $ 478 $ 1,421 $ 1,701

Expenses

Expenses	9 Months Ended
	Sep. 30, 2021
Other Expenses [Abstract]
Expenses	Expenses The following table presents the components of other expenses for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2021 2020 2021 2020 Professional services $ 91 $ 89 $ 246 $ 261 Regulatory fees and assessments 16 16 53 45 Sales advertising public relations 13 20 46 50 Securities processing 8 10 22 40 Insurance 3 2 9 10 Bank operations 3 2 7 15 Other 87 90 259 281 Total other expenses $ 221 $ 229 $ 642 $ 702 Acquisition Costs We recorded approximately $11 million and $33 million of acquisition costs in the three and nine months ended September 30, 2021, respectively, compared to $15 million and $38 million in the same periods in 2020, respectively, related to our acquisition of CRD. In addition, we recorded approximately $7 million of acquisition costs in the third quarter of 2021 related to our proposed acquisition of the BBH Investor Services business. Restructuring and Repositioning Charges The following table presents aggregate activity for repositioning charges for the periods indicated: (In millions) Employee Real Estate Asset and Other Write-offs Total Accrual Balance at December 31, 2019 $ 190 $ 7 $ 1 $ 198 Payments and Other Adjustments (33) (1) — (34) Accrual Balance at March 31, 2020 157 6 1 164 Payments and Other Adjustments (25) (1) — (26) Accrual Balance at June 30, 2020 132 5 1 138 Payments and Other Adjustments (10) 1 (1) (10) Accrual Balance at September 30, 2020 $ 122 $ 6 $ — $ 128 Accrual Balance at December 31, 2020 $ 190 $ 6 $ — $ 196 Accruals for Beacon (1) — — (1) Accruals for Repositioning Charges — 2 — 2 Payments and Other Adjustments (9) (2) — (11) Accrual Balance at March 31, 2021 180 6 — 186 Payments and Other Adjustments (34) — — (34) Accrual Balance at June 30, 2021 146 6 — 152 Payments and Other Adjustments (23) — — (23) Accrual Balance at September 30, 2021 $ 123 $ 6 $ — $ 129

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share For additional information on our earnings per share calculation methodologies, refer to pages 181 to 182 in Note 23 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. The following table presents the computation of basic and diluted earnings per common share for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, (Dollars in millions, except per share amounts) 2021 2020 2021 2020 Net income $ 714 $ 555 $ 1,996 $ 1,883 Less: Preferred stock dividends (21) (38) (85) (123) Dividends and undistributed earnings allocated to participating securities (1) — — (1) (1) Net income available to common shareholders $ 693 $ 517 $ 1,910 $ 1,759 Average common shares outstanding (In thousands): Basic average common shares 347,718 352,586 348,106 352,829 Effect of dilutive securities: equity-based awards 5,776 4,582 5,270 4,142 Diluted average common shares 353,494 357,168 353,376 356,971 Anti-dilutive securities (2) 97 1,309 119 1,351 Earnings per common share: Basic $ 1.99 $ 1.47 $ 5.49 $ 4.99 Diluted (3) 1.96 1.45 5.40 4.93 (1) Represents the portion of net income available to common equity allocated to participating securities, composed of unvested and fully vested SERP (Supplemental executive retirement plans) shares and fully vested deferred director stock awards, which are equity-based awards that contain non-forfeitable rights to dividends, and are considered to participate with the common stock in undistributed earnings. (2) Represents equity-based awards outstanding but not included in the computation of diluted average common shares, because their effect was anti-dilutive. Additional information about equity-based awards is provided on pages 176 and 177 in Note 18 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. (3) Calculations reflect allocation of earnings to participating securities using the two-class method, as this computation is more dilutive than the treasury stock method.

Line of Business Information

Line of Business Information	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Line of Business Information	Line of Business Information Our operations are organized into two lines of business: Investment Servicing and Investment Management, which are defined based on products and services provided. The results of operations for these lines of business are not necessarily comparable with those of other companies, including companies in the financial services industry. For information about our two lines of business, as well as revenues, expenses and capital allocation methodologies associated with them, refer to pages 182 to 183 in Note 24 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. The following table is a summary of our line of business results for the periods indicated. The "Other" columns represent costs incurred that are not allocated to a specific line of business, certain employee costs, including certain severance and restructuring costs, acquisition costs and certain provisions for legal contingencies. Three Months Ended September 30, Investment Investment Other Total (Dollars in millions) 2021 2020 2021 2020 2021 2020 2021 2020 Servicing fees $ 1,395 $ 1,301 $ — $ — $ — $ — $ 1,395 $ 1,301 Management fees — — 526 479 — — 526 479 Foreign exchange trading services 266 252 13 18 — — 279 270 Securities finance 103 81 3 3 — — 106 84 Software and processing fees (1) 204 162 (6) 10 — — 198 172 Total fee revenue 1,968 1,796 536 510 — — 2,504 2,306 Net interest income 491 482 (4) (4) — — 487 478 Total other income (1) — — — — — (1) — Total revenue 2,458 2,278 532 506 — — 2,990 2,784 Provision for credit losses (2) — — — — — (2) — Total expenses 1,755 1,739 339 358 22 6 2,116 2,103 Income before income tax expense $ 705 $ 539 $ 193 $ 148 $ (22) $ (6) $ 876 $ 681 Pre-tax margin 29 % 24 % 36 % 29 % 29 % 24 % Nine Months Ended September 30, Investment Investment Other Total (Dollars in millions) 2021 2020 2021 2020 2021 2020 2021 2020 Servicing fees $ 4,165 $ 3,860 $ — $ — $ — $ — $ 4,165 $ 3,860 Management fees — — 1,523 1,387 — — 1,523 1,387 Foreign exchange trading services 869 998 42 41 — — 911 1,039 Securities finance 304 258 10 10 — — 314 268 Software and processing fees (1) 585 528 3 1 — — 588 529 Total fee revenue 5,923 5,644 1,578 1,439 — — 7,501 7,083 Net interest income 1,432 1,716 (11) (15) — — 1,421 1,701 Total other income (1) 2 — — 53 — 52 2 Total revenue 7,354 7,362 1,567 1,424 53 — 8,974 8,786 Provision for credit losses (26) 88 — — — — (26) 88 Total expenses 5,389 5,315 1,082 1,096 88 29 6,559 6,440 Income before income tax expense $ 1,991 $ 1,959 $ 485 $ 328 $ (35) $ (29) 2,441 $ 2,258 Pre-tax margin 27 % 27 % 31 % 23 % 27 % 26 % (1) Investment Management includes other revenue items that are primarily driven by equity market movements.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers For additional information on the nature of services and our revenue from contracts with customers, including revenues associated with both our Investment Servicing and Investment Management lines of business, refer to pages 184 to 186 in Note 25 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. Revenue by category In the following tables, revenue is disaggregated by our two lines of business and by revenue stream for which the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. Three Months Ended September 30, 2021 Investment Servicing Investment Management Other Total (Dollars in millions) Topic 606 revenue All other revenue Total Topic 606 revenue All other revenue Total Topic 606 revenue All other revenue Total 2021 Servicing fees $ 1,395 $ — 1,395 $ — $ — $ — $ — $ — $ — $ 1,395 Management fees — — — 526 — 526 — — — 526 Foreign exchange trading services 82 184 266 13 — 13 — — — 279 Securities finance 60 43 103 — 3 3 — — — 106 Software and processing fees 126 78 204 — (6) (6) — — — 198 Total fee revenue 1,663 305 1,968 539 (3) 536 — — — 2,504 Net interest income — 491 491 — (4) (4) — — — 487 Total other income — (1) (1) — — — — — — (1) Total revenue $ 1,663 $ 795 $ 2,458 $ 539 $ (7) $ 532 $ — $ — $ — $ 2,990 Nine Months Ended September 30, 2021 Investment Servicing Investment Management Other Total (Dollars in millions) Topic 606 revenue All other revenue Total Topic 606 revenue All other revenue Total Topic 606 revenue All other revenue Total 2021 Servicing fees $ 4,165 $ — $ 4,165 $ — $ — $ — $ — $ — $ — $ 4,165 Management fees — — — 1,523 — 1,523 — — — 1,523 Foreign exchange trading services 260 609 869 42 — 42 — — — 911 Securities finance 181 123 304 — 10 10 — — — 314 Software and processing fees 390 195 585 — 3 3 — — — 588 Total fee revenue 4,996 927 5,923 1,565 13 1,578 — — — 7,501 Net interest income — 1,432 1,432 — (11) (11) — — — 1,421 Total other income — (1) (1) — — — — 53 53 52 Total revenue $ 4,996 $ 2,358 $ 7,354 $ 1,565 $ 2 $ 1,567 $ — $ 53 $ 53 $ 8,974 Three Months Ended September 30, 2020 Investment Servicing Investment Management Total (Dollars in millions) Topic 606 revenue All other revenue Total Topic 606 revenue All other revenue Total 2020 Servicing fees $ 1,301 $ — $ 1,301 $ — $ — $ — $ 1,301 Management fees — — — 479 — 479 479 Foreign exchange trading services 90 162 252 18 — 18 270 Securities finance 42 39 81 — 3 3 84 Software and processing fees 108 54 162 — 10 10 172 Total fee revenue 1,541 255 1,796 497 13 510 2,306 Net interest income — 482 482 — (4) (4) 478 Total revenue $ 1,541 $ 737 $ 2,278 $ 497 $ 9 $ 506 $ 2,784 Nine Months Ended September 30, 2020 Investment Servicing Investment Management Total (Dollars in millions) Topic 606 revenue All other revenue Total Topic 606 revenue All other revenue Total 2020 Servicing fees $ 3,860 $ — $ 3,860 $ — $ — $ — $ 3,860 Management fees — — — 1,387 — 1,387 1,387 Foreign exchange trading services 285 713 998 41 — 41 1,039 Securities finance 162 96 258 — 10 10 268 Software and processing fees 366 162 528 — 1 1 529 Total fee revenue 4,673 971 5,644 1,428 11 1,439 7,083 Net interest income — 1,716 1,716 — (15) (15) 1,701 Total other income — 2 2 — — — 2 Total revenue $ 4,673 $ 2,689 $ 7,362 $ 1,428 $ (4) $ 1,424 $ 8,786 Contract balances and contract costs A s of September 30, 2021 and December 31, 2020, net receivables of $2.87 billion and $2.68 billion, respectively, are included in accrued interest and fees receivable, representing amounts billed or currently billable related to revenue from contracts with customers. As performance obligations are satisfied, we have an unconditional right to payment and billing is generally performed monthly or quarterly; therefore, we do not have significant contract assets or liabilities. No adjustments are made to the promised amount of consideration for the effects of a significant financing component as the period between when we transfer a promised service to a customer and when the customer pays for that service is expected to be one year or less.

Non-U.S. Activities

Non-U.S. Activities	9 Months Ended
	Sep. 30, 2021
Segments, Geographical Areas [Abstract]
Non-U.S. Activities	Non-U.S. Activities We define our non-U.S. activities as those revenue-producing business activities that arise from clients which are generally serviced or managed outside the U.S. Due to the integrated nature of our business, precise segregation of our U.S. and non-U.S. activities is not possible. Subjective estimates, assumptions and other judgments are applied to quantify the financial results and assets related to our non-U.S. activities, including our application of funds transfer pricing, our asset and liability management policies and our allocation of certain indirect corporate expenses. Management periodically reviews and updates its processes for quantifying the financial results and assets related to our non-U.S. activities. The following table presents our U.S. and non-U.S. financial results for the periods indicated: Three Months Ended September 30, 2021 2020 (In millions) Non-U.S. (1) U.S. Total Non-U.S. (1) U.S. Total Total revenue $ 1,331 $ 1,659 $ 2,990 $ 1,268 $ 1,516 $ 2,784 Income before income tax expense 387 489 876 325 356 681 Nine Months Ended September 30, 2021 2020 (In millions) Non-U.S. (1) U.S. Total Non-U.S. (1) U.S. Total Total revenue $ 3,987 $ 4,987 $ 8,974 $ 3,894 $ 4,892 $ 8,786 Income before income tax expense 1,095 1,346 2,441 1,002 1,256 2,258 (1) Geographic mix is generally based on the domicile of the entity servicing the funds and is not necessarily representative of the underlying asset mix. Non-U.S. assets were $96.28 billion and $92.33 billion as of September 30, 2021 and 2020, respectively.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accounting and financial reporting policies of State Street Corporation conform to U.S. GAAP. State Street Corporation, the Parent Company, is a financial holding company headquartered in Boston, Massachusetts. Unless otherwise indicated or unless the context requires otherwise, all references in these notes to consolidated financial statements to “State Street,” “we,” “us,” “our” or similar references mean State Street Corporation and its subsidiaries on a consolidated basis, including our principal banking subsidiary, State Street Bank.
Consolidation	The consolidated financial statements accompanying these condensed notes are unaudited. In the opinion of management, all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair statement of the consolidated results of operations in these financial statements, have been made. Certain previously reported amounts presented in this Form 10-Q have been reclassified to conform to current-period presentation. Events occurring subsequent to the date of our consolidated statement of condition were evaluated for potential recognition or disclosure in our consolidated financial statements through the date we filed this Form 10-Q with the SEC.
Use of Estimates	The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions in the application of certain of our significant accounting policies that may materially affect the reported amounts of assets, liabilities, equity, revenue and expenses. As a result of unanticipated events or circumstances, actual results could differ from those estimates. These accounting estimates reflect the best judgment of management, but actual results could differ. Our consolidated statement of condition as of December 31, 2020 included in the accompanying consolidated financial statements was derived from the audited financial statements as of that date, but does not include all notes required by U.S. GAAP for a complete set of consolidated financial statements. In September 2021, we announced that we had entered into a definitive agreement to acquire the BBH Investor Services business for $3.5 billion in cash.
Recent Accounting Developments	Recent Accounting Developments We did not adopt any new accounting standards in the third quarter of 2021 that had a material impact to our financial statements. Additionally, we continue to evaluate accounting standards that were recently issued but not yet adopted as of September 30, 2021; none are expected to have a material impact to our financial statements.
Fair Value Measurements	Fair Value Measurements We carry trading account assets and liabilities, AFS debt securities, certain equity securities and various types of derivative financial instruments, at fair value in our consolidated statement of condition on a recurring basis. Changes in the fair values of these financial assets and liabilities are recorded either as components of our consolidated statement of income or as components of AOCI within shareholders' equity in our consolidated statement of condition. We measure fair value for the above-described financial assets and liabilities in conformity with U.S. GAAP that governs the measurement of the fair value of financial instruments. Management believes that its valuation techniques and underlying assumptions used to measure fair value conform to the provisions of U.S. GAAP. We categorize the financial assets and liabilities that we carry at fair value based on a prescribed three-level valuation hierarchy. For information about our valuation techniques for financial assets and financial liabilities measured at fair value and the fair value hierarchy, refer to pages 135 to 142 in Note 2 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K.

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables present information with respect to our financial assets and liabilities carried at fair value in our consolidated statement of condition on a recurring basis as of the dates indicated: Fair Value Measurements on a Recurring Basis As of September 30, 2021 (In millions) Quoted Market Prices in Active Markets (Level 1) Pricing Methods with Significant Observable Market Inputs (Level 2) Pricing Methods with Significant Unobservable Market Inputs (Level 3) Impact of Netting (1) Total Net Carrying Value in Consolidated Statement of Condition Assets: Trading account assets: U.S. government securities $ 40 $ — $ — $ 40 Non-U.S. government securities — 135 — 135 Other — 545 — 545 Total trading account assets 40 680 — 720 Available-for-sale investment securities: U.S. Treasury and federal agencies: Direct obligations 14,339 — — 14,339 Mortgage-backed securities — 16,223 — 16,223 Total U.S. Treasury and federal agencies 14,339 16,223 — 30,562 Non-U.S. debt securities: Mortgage-backed securities — 2,141 — 2,141 Asset-backed securities — 2,365 — 2,365 Non-U.S. sovereign, supranational and non-U.S. agency — 22,854 — 22,854 Other — 3,306 — 3,306 Total non-U.S. debt securities — 30,666 — 30,666 Asset-backed securities: Student loans — 231 — 231 Collateralized loan obligations — 4,296 — 4,296 Non-agency CMBS and RMBS (2) — 59 — 59 Other — 92 — 92 Total asset-backed securities — 4,678 — 4,678 State and political subdivisions — 1,396 — 1,396 Other U.S. debt securities — 2,977 — 2,977 Total available-for-sale investment securities 14,339 55,940 — 70,279 Other assets: Derivative instruments: Foreign exchange contracts — 16,451 2 $ (8,892) 7,561 Interest rate contracts 4 — — — 4 Total derivative instruments 4 16,451 2 (8,892) 7,565 Other — 652 — — 652 Total assets carried at fair value $ 14,383 $ 73,723 $ 2 $ (8,892) $ 79,216 Liabilities: Accrued expenses and other liabilities: Derivative instruments: Foreign exchange contracts $ 2 $ 15,733 $ — $ (11,619) $ 4,116 Interest rate contracts — 27 — (4) 23 Other derivative contracts — 176 — — 176 Total derivative instruments 2 15,936 — (11,623) 4,315 Total liabilities carried at fair value $ 2 $ 15,936 $ — $ (11,623) $ 4,315 (1) Represents counterparty netting against level 2 financial assets and liabilities where a legally enforceable master netting agreement exists between us and the counterparty. Netting also reflects asset and liability reductions of $1.23 billion and $3.96 billion, respectively, for cash collateral received from and provided to derivative counterparties. (2) Consists entirely of non-agency CMBS. Fair Value Measurements on a Recurring Basis As of December 31, 2020 (In millions) Quoted Market Pricing Methods Pricing Methods Impact of Netting (1) Total Net Assets: Trading account assets: U.S. government securities $ 40 $ — $ — $ 40 Non-U.S. government securities — 239 — 239 Other 17 519 — 536 Total trading account assets 57 758 — 815 Available-for-sale investment securities: U.S. Treasury and federal agencies: Direct obligations 6,575 — — 6,575 Mortgage-backed securities — 14,305 — 14,305 Total U.S. Treasury and federal agencies 6,575 14,305 — 20,880 Non-U.S. debt securities: Mortgage-backed securities — 1,996 — 1,996 Asset-backed securities — 2,291 — 2,291 Non-U.S. sovereign, supranational and non-U.S. agency — 22,087 — 22,087 Other — 3,355 — 3,355 Total non-U.S. debt securities — 29,729 — 29,729 Asset-backed securities: Student loans — 314 — 314 Collateralized loan obligations — 2,952 14 2,966 Non-agency CMBS and RMBS (2) — 78 — 78 Other — 90 — 90 Total asset-backed securities — 3,434 14 3,448 State and political subdivisions — 1,548 — 1,548 Other U.S. debt securities — 3,443 — 3,443 Total available-for-sale investment securities 6,575 52,459 14 59,048 Other assets: Derivative instruments: Foreign exchange contracts — 25,941 2 $ (20,140) 5,803 Interest rate contracts 1 — — — 1 Total derivative instruments 1 25,941 2 (20,140) 5,804 Other — 525 — — 525 Total assets carried at fair value $ 6,633 $ 79,683 $ 16 $ (20,140) $ 66,192 Liabilities: Accrued expenses and other liabilities: Trading account liabilities: Other $ 4 $ — $ — $ — $ 4 Derivative instruments: Foreign exchange contracts 1 25,925 1 (15,558) 10,369 Interest rate contracts — 42 — — 42 Other derivative contracts — 157 — — 157 Total derivative instruments 1 26,124 1 (15,558) 10,568 Total liabilities carried at fair value $ 5 $ 26,124 $ 1 $ (15,558) $ 10,572 (1) Represents counterparty netting against level 2 financial assets and liabilities where a legally enforceable master netting agreement exists between us and the counterparty. Netting also reflects asset and liability reductions of $5.87 billion and $1.29 billion, respectively, for cash collateral received from and provided to derivative counterparties. (2) Consists entirely of non-agency CMBS.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following tables present activity related to our level 3 financial assets during the three and nine months ended September 30, 2021 and 2020, respectively. Transfers into and out of level 3 are reported as of the beginning of the period presented. During the three months ended September 30, 2021, there were no transfers into and out of level 3. During the nine months ended September 30, 2021, transfers into level 3 were primarily related to a U.S. corporate bond, for which fair value was measured using information obtained from third party sources, including non-binding broker/dealer quotes. During the nine months ended September 30, 2021, transfers out of level 3 were primarily related to collateralized loan obligations and a U.S. corporate bond, for which fair value was measured using prices for which observable market information became available. During the three and nine months ended September 30, 2020, transfers into level 3 were primarily related to collateralized loan obligations. During the three and nine months ended September 30, 2020, there were no transfers out of level 3. Fair Value Measurements Using Significant Unobservable Inputs Three Months Ended September 30, 2021 Fair Value as of June 30, 2021 Total Realized and Unrealized Gains (Losses) (1) Purchases Sales Settlements Transfers into Level 3 Transfers out of Level 3 Fair Value as of September 30, 2021 (1) Change in Unrealized Gains (Losses) Related to Financial Instruments (In millions) Recorded in Revenue (1) Recorded in Other Comprehensive Income (1) Assets: Other assets: Derivative instruments: Foreign exchange contracts $ 2 $ — $ — $ 1 $ — $ (1) $ — $ — $ 2 $ — Total derivative instruments 2 — — 1 — (1) — — 2 — Total assets carried at fair value $ 2 $ — $ — $ 1 $ — $ (1) $ — $ — $ 2 $ — (1) Total realized and unrealized gains (losses) on derivative instruments are included within foreign exchange trading services. Fair Value Measurements Using Significant Unobservable Inputs Nine Months Ended September 30, 2021 Fair Value as of Total Realized and Unrealized Gains (Losses) (1) Purchases Sales Settlements Transfers into Level 3 Transfers out of Level 3 Fair Value as of September 30, 2021 (1) Change in Unrealized Gains (Losses) Related to Financial Instruments (In millions) Recorded in Revenue (1) Recorded in Other Comprehensive Income (1) Assets: Available-for-sale Investment securities: Asset-backed securities: Collateralized loan obligations $ 14 $ — $ — $ 106 $ — $ — $ — $ (120) $ — Total asset-backed securities 14 — — 106 — — — (120) — Other U.S. debt securities — — — — — — 15 (15) — Total available-for-sale investment securities 14 — — 106 — — 15 (135) — Other assets: Derivative instruments: Foreign exchange contracts 2 (3) — 4 — (1) — — 2 $ (1) Total derivative instruments 2 (3) — 4 — (1) — — 2 (1) Total assets carried at fair value $ 16 $ (3) $ — $ 110 $ — $ (1) $ 15 $ (135) $ 2 $ (1) (1) Total realized and unrealized gains (losses) on AFS investment securities are included within gains (losses) related to investment securities, net. Total realized and unrealized gains (losses) on derivative instruments are included within foreign exchange trading services. Fair Value Measurements Using Significant Unobservable Inputs Three Months Ended September 30, 2020 Fair Value Total Realized and Unrealized Gains (Losses) (1) Purchases Sales Settlements Transfers Transfers Fair Value as of September 30, 2020 (1) Change in Unrealized Gains (Losses) Related to Financial Instruments (In millions) Recorded (1) Recorded (1) Assets: Available-for-sale Investment securities: Asset-backed securities: Collateralized loan obligations $ 1,869 $ — $ 14 $ 663 $ (34) $ (24) $ 50 $ — $ 2,538 Total asset-backed securities 1,869 — 14 663 (34) (24) 50 — 2,538 Non-U.S. debt securities: Asset-backed securities 876 — 45 — — (3) — — 918 Other 45 — 2 — — — — — 47 Total non-U.S. debt securities 921 — 47 — — (3) — — 965 Total available-for-sale investment securities 2,790 — 61 663 (34) (27) 50 — 3,503 Other assets: Derivative instruments: Foreign exchange contracts 2 (2) — 9 — (3) — — 6 $ (4) Total derivative instruments 2 (2) — 9 — (3) — — 6 (4) Total assets carried at fair value $ 2,792 $ (2) $ 61 $ 672 $ (34) $ (30) $ 50 $ — $ 3,509 $ (4) ( 1) Total realized and unrealized gains (losses) on AFS investment securities are included within gains (losses) related to investment securities, net. Total realized and unrealized gains (losses) on derivative instruments are included within foreign exchange trading services. Fair Value Measurements Using Significant Unobservable Inputs Nine Months Ended September 30, 2020 Fair Value Total Realized and Unrealized Gains (Losses) (1) Purchases Sales Settlements Transfers Transfers Fair Value as of September 30, 2020 (1) Change in Unrealized Gains (Losses) Related to Financial Instruments (In millions) Recorded (1) Recorded (1) Assets: Available-for-sale Investment securities: Asset-backed securities: Collateralized loan obligations $ 1,820 $ — $ (10) $ 850 $ (95) $ (77) $ 50 $ — $ 2,538 Total asset-backed securities 1,820 — (10) 850 (95) (77) 50 — 2,538 Non-U.S. debt securities: Asset-backed securities 887 — 35 1 — (5) — — 918 Other 45 — 2 — — — — — 47 Total non-U.S. debt securities 932 — 37 1 — (5) — — 965 Total available-for-sale investment securities 2,752 — 27 851 (95) (82) 50 — 3,503 Other assets: Derivative instruments: Foreign exchange contracts 4 (7) — 10 — (1) — — 6 $ (4) Total derivative instruments 4 (7) — 10 — (1) — — 6 (4) Total assets carried at fair value $ 2,756 $ (7) $ 27 $ 861 $ (95) $ (83) $ 50 $ — $ 3,509 $ (4) ( 1) Total realized and unrealized gains (losses) on AFS investment securities are included within gains (losses) related to investment securities, net. Total realized and unrealized gains (losses) on derivative instruments are included within foreign exchange trading services.
Fair Value Inputs, Quantitative Information	The following table presents quantitative information, as of the dates indicated, about the valuation techniques and significant unobservable inputs used in the valuation of our level 3 financial assets and liabilities measured at fair value on a recurring basis for which we use internally-developed pricing models. The significant unobservable inputs for our level 3 financial assets and liabilities whose fair value is measured using pricing information from non-binding broker/dealer quotes are not included in the table, as the specific inputs applied are not provided by the broker/dealer. Quantitative Information about Level 3 Fair Value Measurements Fair Value Range Weighted-Average (Dollars in millions) As of September 30, 2021 As of December 31, 2020 Valuation Technique Significant Unobservable Input (1) As of September 30, 2021 As of September 30, 2021 As of December 31, 2020 Significant unobservable inputs readily available to State Street: Assets: Derivative Instruments, foreign exchange contracts $ 2 $ 2 Option model Volatility 5.0% - 12.6% 7.6 % 7.9 % Total $ 2 $ 2 Liabilities: Derivative instruments, foreign exchange contracts $ — $ 1 Option model Volatility 6.9% - 8.0% 7.4 % 7.7 % Total $ — $ 1 (1) Significant changes in these unobservable inputs may result in significant changes in fair value measurement of the derivative instrument.
Carrying Value and Estimated Fair Value of Financial Instruments by Fair Value Hierarchy	The following tables present the reported amounts and estimated fair values of the financial assets and liabilities not carried at fair value, as they would be categorized within the fair value hierarchy, as of the dates indicated: Fair Value Hierarchy (In millions) Reported Amount Estimated Fair Value Quoted Market Prices in Active Markets (Level 1) Pricing Methods with Significant Observable Market Inputs (Level 2) Pricing Methods with Significant Unobservable Market Inputs (Level 3) September 30, 2021 Financial Assets: Cash and due from banks $ 4,606 4,606 $ 4,606 $ — $ — Interest-bearing deposits with banks 107,553 107,553 — 107,553 — Securities purchased under resale agreements 2,847 2,847 — 2,847 — Investment securities held-to-maturity 43,346 43,728 2,708 41,020 — Net loans (1) 32,702 32,806 — 30,292 2,514 Financial Liabilities: Deposits: Non-interest-bearing $ 64,885 $ 64,885 $ — $ 64,885 $ — Interest-bearing - U.S. 108,909 108,909 — 108,909 — Interest-bearing - non-U.S. 85,579 85,579 — 85,579 — Securities sold under repurchase agreements 637 637 — 637 — Other short-term borrowings 549 549 — 549 — Long-term debt 12,978 13,151 — 13,069 82 (1) Includes $61 million of loans classified as held-for-sale that were measured at fair value in level 2 as of September 30, 2021. Fair Value Hierarchy (In millions) Reported Amount Estimated Fair Value Quoted Market Prices in Active Markets (Level 1) Pricing Methods with Significant Observable Market Inputs (Level 2) Pricing Methods with Significant Unobservable Market Inputs (Level 3) December 31, 2020 Financial Assets: Cash and due from banks $ 3,467 $ 3,467 $ 3,467 $ — $ — Interest-bearing deposits with banks 116,960 116,960 — 116,960 — Securities purchased under resale agreements 3,106 3,106 — 3,106 — HTM securities purchased under the MMLF 3,299 3,304 — 3,304 — Investment securities held-to-maturity 48,929 50,003 6,115 43,888 — Net loans 27,803 27,884 — 25,668 2,216 Other (1) 4,753 4,753 — 4,753 — Financial Liabilities: Deposits: Non-interest-bearing $ 49,439 $ 49,439 $ — $ 49,439 $ — Interest-bearing - U.S. 102,331 102,331 — 102,331 — Interest-bearing - non-U.S. 88,028 88,028 — 88,028 — Securities sold under repurchase agreements 3,413 3,413 — 3,413 — Short-term borrowings under the MMLF 3,302 3,302 — 3,302 — Other short-term borrowings 685 685 — 685 — Long-term debt 13,805 14,162 — 14,049 113 Other (1) 4,753 4,753 — 4,753 — (1) Represents a portion of underlying client assets related to our enhanced custody business, which clients have allowed us to transfer and re-pledge.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Schedule of Marketable Securities	The following table presents the amortized cost, fair value and associated unrealized gains and losses of AFS and HTM investment securities as of the dates indicated: September 30, 2021 December 31, 2020 Amortized Cost Gross Unrealized Fair Value Amortized Cost Gross Unrealized Fair Value (In millions) Gains Losses Gains Losses Available-for-sale: U.S. Treasury and federal agencies: Direct obligations $ 14,372 $ 30 $ 63 $ 14,339 $ 6,453 $ 123 $ 1 $ 6,575 Mortgage-backed securities 16,051 215 43 16,223 13,891 421 7 14,305 Total U.S. Treasury and federal agencies 30,423 245 106 30,562 20,344 544 8 20,880 Non-U.S. debt securities: Mortgage-backed securities 2,130 12 1 2,141 1,994 4 2 1,996 Asset-backed securities 2,365 2 2 2,365 2,294 1 4 2,291 Non-U.S. sovereign, supranational and non-U.S. agency 22,747 150 43 22,854 21,769 321 3 22,087 Other (1) 3,294 29 17 3,306 3,297 58 — 3,355 Total non-U.S. debt securities 30,536 193 63 30,666 29,354 384 9 29,729 Asset-backed securities: Student loans (2) 228 3 — 231 313 2 1 314 Collateralized loan obligations (3) 4,293 4 1 4,296 2,969 3 6 2,966 Non-agency CMBS and RMBS (4) 58 1 — 59 76 2 — 78 Other 90 2 — 92 90 — — 90 Total asset-backed securities 4,669 10 1 4,678 3,448 7 7 3,448 State and political subdivisions (5) 1,336 63 3 1,396 1,470 80 2 1,548 Other U.S. debt securities (6) 2,943 39 5 2,977 3,371 72 — 3,443 Total available-for-sale securities (7) $ 69,907 $ 550 $ 178 $ 70,279 $ 57,987 $ 1,087 $ 26 $ 59,048 Held-to-maturity: U.S. Treasury and federal agencies: Direct obligations $ 2,709 $ 22 $ — $ 2,731 $ 6,057 $ 83 $ — $ 6,140 Mortgage-backed securities 33,525 525 309 33,741 36,901 955 67 37,789 Total U.S. Treasury and federal agencies 36,234 547 309 36,472 42,958 1,038 67 43,929 Non-U.S. debt securities: Mortgage-backed securities 209 65 2 272 303 68 4 367 Non-U.S. sovereign, supranational and non-U.S. agency 1,508 — 3 1,505 342 — — 342 Total non-U.S. debt securities 1,717 65 5 1,777 645 68 4 709 Asset-backed securities: Student loans (2) 5,017 64 13 5,068 4,774 33 25 4,782 Non-agency CMBS and RMBS (8) 380 31 — 411 554 30 1 583 Total asset-backed securities 5,397 95 13 5,479 5,328 63 26 5,365 Total (7)(9) 43,348 707 327 43,728 48,931 1,169 97 50,003 Held-to-maturity under money market mutual fund liquidity facility — — — — 3,300 4 — 3,304 Total held-to-maturity securities (7) $ 43,348 $ 707 $ 327 $ 43,728 $ 52,231 $ 1,173 $ 97 $ 53,307 (1) As of September 30, 2021 and December 31, 2020, the fair value includes non-U.S. corporate bonds of $1.76 billion and $1.88 billion, respectively, and non-U.S. collateralized loan obligations of $0.88 billion and $0.96 billion, respectively. (2) Primarily comprised of securities guaranteed by the federal government with respect to at least 97% of defaulted principal and accrued interest on the underlying loans. (3) Excludes collateralized loan obligations in loan form. Refer to Note 4 for additional information. (4) Consists entirely of non-agency CMBS as of both September 30, 2021 and December 31, 2020. (5) As of September 30, 2021 and December 31, 2020, the fair value of state and political subdivisions includes securities in trusts of $0.61 billion and $0.70 billion, respectively. Additional information about these trusts is provided in Note 11. (6) As of September 30, 2021 and December 31, 2020, the fair value of U.S. corporate bonds was $2.98 billion and $3.44 billion, respectively. (7) An immaterial amount of accrued interest related to HTM and AFS investment securities was excluded from the amortized cost basis for the period ended September 30, 2021. (8) As of September 30, 2021 and December 31, 2020, the total amortized cost included $315 million and $464 million, respectively, of non-agency CMBS and $65 million and $90 million of non-agency RMBS, respectively. (9) As of September 30, 2021, we recognized an allowance for credit losses of $2 million on HTM investment securities.
Schedule of Gross Pre-tax Unrealized Losses on Investment Securities	The following tables present the aggregate fair values of AFS investment securities that have been in a continuous unrealized loss position for less than 12 months, and those that have been in a continuous unrealized loss position for 12 months or longer, as of the dates indicated: As of September 30, 2021 Less than 12 months 12 months or longer Total (In millions) Fair Gross Fair Gross Fair Gross Available-for-sale: U.S. Treasury and federal agencies: Direct obligations $ 11,538 $ 63 $ — $ — $ 11,538 $ 63 Mortgage-backed securities 3,847 41 162 2 4,009 43 Total U.S. Treasury and federal agencies 15,385 104 162 2 15,547 106 Non-U.S. debt securities: Mortgage-backed securities 394 1 33 — 427 1 Asset-backed securities 646 1 464 1 1,110 2 Non-U.S. sovereign, supranational and non-U.S. agency 5,631 42 39 1 5,670 43 Other 1,291 17 67 — 1,358 17 Total non-U.S. debt securities 7,962 61 603 2 8,565 63 Asset-backed securities: Collateralized loan obligations 2,516 1 62 — 2,578 1 Total asset-backed securities 2,516 1 62 — 2,578 1 State and political subdivisions 83 — 45 3 128 3 Other U.S. debt securities 573 5 — — 573 5 Total $ 26,519 $ 171 $ 872 $ 7 $ 27,391 $ 178 As of December 31, 2020 Less than 12 months 12 months or longer Total (In millions) Fair Gross Fair Gross Fair Gross Available-for-sale: U.S. Treasury and federal agencies: Direct obligations $ 1,636 $ 1 $ — $ — $ 1,636 $ 1 Mortgage-backed securities 1,394 7 63 — 1,457 7 Total U.S. Treasury and federal agencies 3,030 8 63 — 3,093 8 Asset-backed securities: Student loans 31 — 197 1 228 1 Collateralized loan obligations 1,498 4 369 2 1,867 6 Total asset-backed securities 1,529 4 566 3 2,095 7 Non-U.S. debt securities: Mortgage-backed securities 600 1 120 1 720 2 Asset-backed securities 1,015 3 446 1 1,461 4 Non-U.S. sovereign, supranational and non-U.S. agency 489 — — — 489 — Other 715 3 80 — 795 3 Total non-U.S. debt securities 2,819 7 646 2 3,465 9 State and political subdivisions 95 — 76 2 171 2 Other U.S. debt securities 17 — — — 17 — Total $ 7,490 $ 19 $ 1,351 $ 7 $ 8,841 $ 26
Investments Classified by Contractual Maturity Date	The following table presents the amortized cost and the fair value of contractual maturities of debt investment securities as of September 30, 2021. The maturities of certain ABS, MBS and collateralized mortgage obligations are based on expected principal payments. Actual maturities may differ from these expected maturities since certain borrowers have the right to prepay obligations with or without prepayment penalties. As of September 30, 2021 (In millions) Under 1 Year 1 to 5 Years 6 to 10 Years Over 10 Years Total Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale: U.S. Treasury and federal agencies: Direct obligations $ 2,112 $ 2,114 $ 11,214 $ 11,169 $ 1,046 $ 1,056 $ — $ — $ 14,372 $ 14,339 Mortgage-backed securities 83 87 845 855 6,227 6,248 8,896 9,033 16,051 16,223 Total U.S. Treasury and federal agencies 2,195 2,201 12,059 12,024 7,273 7,304 8,896 9,033 30,423 30,562 Non-U.S. debt securities: Mortgage-backed securities 212 213 540 543 40 40 1,338 1,345 2,130 2,141 Asset-backed securities 271 271 1,286 1,287 415 415 393 392 2,365 2,365 Non-U.S. sovereign, supranational and non-U.S. agency 5,828 5,835 13,987 14,081 2,917 2,923 15 15 22,747 22,854 Other 786 790 2,077 2,089 375 371 56 56 3,294 3,306 Total non-U.S. debt securities 7,097 7,109 17,890 18,000 3,747 3,749 1,802 1,808 30,536 30,666 Asset-backed securities: Student loans 129 131 — — — — 99 100 228 231 Collateralized loan obligations 29 30 760 761 1,656 1,656 1,848 1,849 4,293 4,296 Non-agency CMBS and RMBS — — — — — — 58 59 58 59 Other — — — — 90 92 — — 90 92 Total asset-backed securities 158 161 760 761 1,746 1,748 2,005 2,008 4,669 4,678 State and political subdivisions 159 160 544 563 528 567 105 106 1,336 1,396 Other U.S. debt securities 718 723 2,183 2,209 42 45 — — 2,943 2,977 Total $ 10,327 $ 10,354 $ 33,436 $ 33,557 $ 13,336 $ 13,413 $ 12,808 $ 12,955 $ 69,907 $ 70,279 Held-to-maturity: U.S. Treasury and federal agencies: Direct obligations $ 2,387 $ 2,403 $ 304 $ 309 $ — $ — $ 18 $ 19 $ 2,709 $ 2,731 Mortgage-backed securities 171 177 285 290 4,528 4,509 28,541 28,765 33,525 33,741 Total U.S. Treasury and federal agencies 2,558 2,580 589 599 4,528 4,509 28,559 28,784 36,234 36,472 Non-U.S. debt securities: Mortgage-backed securities 38 37 18 18 — — 153 217 209 272 Non-U.S. sovereign, supranational and non-U.S. agency 275 275 1,232 1,229 1 1 — — 1,508 1,505 Total non-U.S. debt securities 313 312 1,250 1,247 1 1 153 217 1,717 1,777 Asset-backed securities: Student loans 349 343 110 109 1,071 1,088 3,487 3,528 5,017 5,068 Non-agency CMBS and RMBS 127 140 158 160 2 2 93 109 380 411 Total asset-backed securities 476 483 268 269 1,073 1,090 3,580 3,637 5,397 5,479 Total $ 3,347 $ 3,375 $ 2,107 $ 2,115 $ 5,602 $ 5,600 $ 32,292 $ 32,638 $ 43,348 $ 43,728

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Net Loans	The following table presents our recorded investment in loans, by segment, as of the dates indicated: (In millions) September 30, 2021 December 31, 2020 Domestic (1) : Commercial and financial: Fund Finance (2) $ 12,367 $ 11,531 Leveraged loans 3,407 2,923 Overdrafts 2,352 1,894 Other (3) 2,140 2,688 Commercial real estate 2,384 2,096 Total domestic 22,650 21,132 Foreign (1) : Commercial and financial: Fund Finance (2) 7,368 4,432 Leveraged loans 1,317 1,242 Overdrafts 1,462 1,088 Other (3) — 31 Total foreign 10,147 6,793 Total loans (2) 32,797 27,925 Allowance for credit losses (95) (122) Loans, net of allowance $ 32,702 $ 27,803 (1) Domestic and foreign categorization is based on the borrower’s country of domicile. (2) Fund finance loans include primarily $6,282 million loans to real money funds, $9,752 million private equity capital call finance loans, $993 million loans to business development companies and $2,412 million collateralized loan obligations in loan form as of September 30, 2021, compared to $6,391 million loans to real money funds, $8,380 million private equity capital call finance loans and $821 million loans to business development companies as of December 31, 2020. (3) Includes $1,532 million securities finance loans, $589 million loans to municipalities and $19 million other loans as of September 30, 2021 and $1,911 million securities finance loans, $754 million loans to municipalities and $54 million other loans as of December 31, 2020.
Recorded Investment in Each Class of Total Loans and Leases by Credit Quality Indicator	The following tables present our recorded loans to counterparties by risk rating, as noted above, as of the dates indicated: September 30, 2021 Commercial and Financial Commercial Real Estate Total Loans (In millions) Investment grade $ 24,936 $ 1,963 $ 26,899 Speculative 5,180 383 5,563 Special mention 118 38 156 Substandard 164 — 164 Doubtful 15 — 15 Total (1) $ 30,413 $ 2,384 $ 32,797 December 31, 2020 Commercial and Financial Commercial Real Estate Total Loans (In millions) Investment grade $ 20,859 $ 1,724 $ 22,583 Speculative 4,852 372 5,224 Special mention 67 — 67 Substandard 34 — 34 Doubtful 17 — 17 Total (1) $ 25,829 $ 2,096 $ 27,925 (1) Loans Include $3,814 million and $2,982 million of overdrafts as of September 30, 2021 and December 31, 2020 respectively. Overdrafts are short-term in nature and do not present a significant credit risk to us. The following table presents the amortized cost basis, by year of origination and credit quality indicator, as of September 30, 2021. For origination years before the fifth annual period, we present the aggregate amortized cost basis of loans. For purchased loans, the date of issuance is used to determine the year of origination, not the date of acquisition. For modified, extended or renewed lending arrangements, we evaluate whether a credit event has occurred which would consider the loan to be a new arrangement. (In millions) 2021 2020 2019 2018 2017 Prior Revolving Loans Total (1) Domestic loans: Commercial and financial: Risk Rating: Investment grade $ 2,696 $ 14 $ 376 $ 2 $ 135 $ — $ 13,120 $ 16,343 Speculative 974 473 719 519 455 67 457 3,664 Special mention — — 70 29 19 — — 118 Substandard — 5 71 56 9 — — 141 Total commercial and financing $ 3,670 $ 492 $ 1,236 $ 606 $ 618 $ 67 $ 13,577 $ 20,266 Commercial real estate: Risk Rating: Investment grade $ 321 $ 129 $ 383 657 $ 276 $ 197 $ — $ 1,963 Speculative 120 49 166 20 — 28 — 383 Special mention — — — 38 — — — 38 Total commercial real estate $ 441 $ 178 $ 549 $ 715 $ 276 $ 225 $ — $ 2,384 Non-U.S. loans: Commercial and financial: Risk Rating: Investment grade $ 3,655 $ — $ — $ — $ — $ — $ 4,938 $ 8,593 Speculative 433 197 294 254 146 31 161 1,516 Substandard — — — 23 — — — 23 Doubtful — — — — 15 — — 15 Total commercial and financing $ 4,088 $ 197 $ 294 $ 277 $ 161 $ 31 $ 5,099 $ 10,147 Total loans $ 8,199 $ 867 $ 2,079 $ 1,598 $ 1,055 $ 323 $ 18,676 $ 32,797 (1) Any reserve associated with accrued interest is not material. As of September 30, 2021, accrued interest receivable of $82 million included in the amortized cost basis of loans has been excluded from the amortized cost basis within this table. The following table presents the amortized cost basis, by year of origination and credit quality indicator as of December 31, 2020: (In millions) 2020 2019 2018 2017 2016 Prior Revolving Loans Total (1) Domestic loans: Commercial and financial: Risk Rating: Investment grade $ 1,894 $ 388 $ 4 $ 167 $ 200 $ — $ 12,836 $ 15,489 Speculative 432 942 822 610 43 — 597 3,446 Special mention — 28 — 39 — — — 67 Substandard — 5 — — 29 — — 34 Total commercial and financing $ 2,326 $ 1,363 $ 826 $ 816 $ 272 $ — $ 13,433 $ 19,036 Commercial real estate: Risk Rating: Investment grade $ 178 $ 383 $ 688 $ 277 $ 197 $ — $ — $ 1,723 Speculative 120 166 58 — — 29 — 373 Total commercial real estate $ 298 $ 549 $ 746 $ 277 $ 197 $ 29 $ — $ 2,096 Non-U.S. loans: Commercial and financial: Risk Rating: Investment grade $ 1,028 $ — $ — $ — $ — $ — $ 4,343 $ 5,371 Speculative 283 401 346 162 26 66 121 1,405 Doubtful — — — 17 — — — 17 Total commercial and financing $ 1,311 $ 401 $ 346 $ 179 $ 26 $ 66 $ 4,464 $ 6,793 Total loans $ 3,935 $ 2,313 $ 1,918 $ 1,272 $ 495 $ 95 $ 17,897 $ 27,925 (1) Any reserve associated with accrued interest is not material. As of December 31, 2020, accrued interest receivable of $72 million included in the amortized cost basis of loans has been excluded from the amortized cost basis within this table.
Schedule of Activity in the Allowance for Loan Losses	The following tables present the activity in the allowance for credit losses by portfolio and class for the periods indicated: Three Months Ended September 30, 2021 Commercial and Financial (In millions) Leveraged Loans Other Loans (1) Commercial Real Estate Held-to-Maturity Securities Off-Balance Sheet Commitments All Other Total Allowance for credit losses: Beginning balance $ 74 $ 12 $ 14 $ 2 $ 19 $ — $ 121 Charge-offs (1) — — — — — (1) Provision (4) — 1 — 1 — (2) Other (2) (1) — — — — — (1) Ending balance $ 68 $ 12 $ 15 $ 2 $ 20 $ — $ 117 (1) Includes $11 million allowance for credit losses on Fund Finance loans and $1 million on other loans. (2) The amount includes primarily foreign currency translation. Nine Months Ended September 30, 2021 Commercial and Financial (In millions) Leveraged Loans Other Loans (1) Commercial Real Estate Held-to-Maturity Securities Off-Balance Sheet Commitments All Other Total Allowance for credit losses: Beginning balance $ 97 $ 17 $ 8 $ 3 $ 22 $ 1 $ 148 Charge-offs (2) — — — — — (2) Provision (24) (5) 7 (1) (2) (1) (26) Other (2) (3) — — — — — (3) Ending balance $ 68 $ 12 $ 15 $ 2 $ 20 $ — $ 117 (1) Includes $11 million allowance for credit losses on Fund Finance loans and $1 million on other loans. (2) The amount includes primarily foreign currency translation. . Three Months Ended September 30, 2020 Commercial and Financial (In millions) Leveraged Loans Other Loans (1) Commercial Real Estate Held-to-Maturity Securities Off-Balance Sheet Commitments All Other Total Allowance for credit losses: Beginning balance $ 113 $ 20 $ 8 $ 3 $ 18 $ 1 $ 163 Charge-offs (2) (14) — — — — — (14) Provision 3 — — — (3) — — Foreign currency translation 4 — — — — — 4 Ending balance $ 106 $ 20 $ 8 $ 3 $ 15 $ 1 $ 153 (1) Includes $15 million allowance for credit losses on Fund Finance loans and $5 million on other loans. (2) Related to the sale of leveraged loans in the third quarter of 2020. Nine Months Ended September 30, 2020 Commercial and Financial (In millions) Leveraged Loans Other Loans Commercial Real Estate Held-to-Maturity Securities Off-Balance Sheet Commitments All Other Total Allowance for credit losses: Beginning balance $ 61 $ 10 $ 2 $ — $ 19 $ 1 $ 93 Charge-offs (1) (33) — — — — — (33) Provision 73 10 6 3 (4) — 88 Foreign currency translation 5 — — — — — 5 Ending balance $ 106 $ 20 $ 8 $ 3 $ 15 $ 1 $ 153 (1) Primarily related to the sale of leveraged loans in the third and third quarters of 2020.

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in the Carrying Amount of Goodwill	The following table presents changes in the carrying amount of goodwill during the periods indicated: (In millions) Investment Servicing (1) Investment Total Goodwill: Ending balance December 31, 2019 $ 7,289 $ 267 $ 7,556 Foreign currency translation 124 3 127 Ending balance December 31, 2020 7,413 270 7,683 Acquisitions (2) 66 — 66 Divestitures (3) (17) — (17) Foreign currency translation (80) (2) (82) Ending balance September 30, 2021 $ 7,382 $ 268 $ 7,650 (1) Investment Servicing includes our acquisition of CRD. (2) Investment Servicing includes our acquisitions of the depositary bank and fund administrator activities of Fideuram Bank Luxembourg, a subsidiary of Intesa Sanpaolo, in the first quarter of 2021, with a total purchase price of approximately EUR 220 million or approximately $258 million, and our acquisition of Mercatus, Inc.in the third quarter of 2021, with a total purchase price of approximately $88 million. We accounted for these acquisitions as business combinations and, in accordance with ASC Topic 805, Business Combinations, we have recorded assets acquired and liabilities assumed at their respective fair values as of the acquisition date. The purchase price accounting reflected is provisional and is based upon estimates and assumptions that are subject to change within the measurement period (up to one year from the acquisition date pursuant to ASC 805). The measurement period remains open for both transactions pending the completion of valuation procedures related to the acquired assets and assumed liabilities, primarily identifiable intangible assets. (3) In the second quarter of 2021, we sold a majority share of our WMS business.
Schedule of Finite-Lived Intangible Assets	The following table presents changes in the net carrying amount of other intangible assets during the periods indicated: (In millions) Investment Servicing (1) Investment Total Other intangible assets: Ending balance December 31, 2019 $ 1,908 $ 122 $ 2,030 Amortization (206) (28) (234) Foreign currency translation 31 — 31 Ending balance December 31, 2020 1,733 94 1,827 Acquisitions (2) 263 — 263 Amortization (165) (18) (183) Foreign currency translation (20) — (20) Ending balance September 30, 2021 $ 1,811 $ 76 $ 1,887 (1) Investment Servicing includes our acquisition of CRD.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The following table presents the gross carrying amount, accumulated amortization and net carrying amount of other intangible assets by type as of the dates indicated: September 30, 2021 Gross Accumulated Net (In millions) Other intangible assets: Client relationships $ 2,803 $ (1,464) $ 1,339 Technology 404 (133) 271 Core deposits 700 (444) 256 Other 103 (82) 21 Total $ 4,010 $ (2,123) $ 1,887 December 31, 2020 Gross Accumulated Net (In millions) Other intangible assets: Client relationships $ 2,704 $ (1,450) $ 1,254 Technology 393 (113) 280 Core deposits 690 (425) 265 Other 107 (79) 28 Total $ 3,894 $ (2,067) $ 1,827

Other Assets (Tables)

Other Assets (Tables)	9 Months Ended
	Sep. 30, 2021
Other Assets [Abstract]
Components of Other Assets	The following table presents the components of other assets as of the dates indicated: (In millions) September 30, 2021 December 31, 2020 Securities borrowed (1) $ 26,643 $ 18,330 Derivative instruments, net 7,565 5,804 Bank-owned life insurance 3,548 3,479 Investments in joint ventures and other unconsolidated entities 3,140 3,095 Collateral, net 1,348 2,616 Receivable for securities settlement 621 117 Right-of-use assets 612 720 Prepaid expenses 474 383 Accounts receivable 395 379 Income tax receivable 359 367 Deferred tax assets, net of valuation allowance (2) 196 233 Deposits with clearing organizations 62 58 Other (3) 988 929 Total $ 45,951 $ 36,510 (1) Refer to Note 8, for further information on the impact of collateral on our financial statement presentation of securities borrowing and securities lending transactions. (2) Deferred tax assets and liabilities recorded in our consolidated statement of condition are netted within the same tax jurisdiction. (3) Consists primarily of Advances of $532 million and $460 million as of September 30, 2021 and December 31, 2020, respectively.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions	The following table presents the aggregate contractual, or notional, amounts of derivative financial instruments, including those entered into for trading and asset-and-liability management activities as of the dates indicated: (In millions) September 30, 2021 December 31, 2020 Derivatives not designated as hedging instruments: Interest rate contracts: Futures $ 3,572 $ 2,842 Foreign exchange contracts: Forward, swap and spot 2,372,570 2,640,989 Options purchased 724 946 Options written 221 661 Futures 2,077 1,980 Other: Stable value contracts (1) 32,704 32,359 Deferred value awards (2) 360 332 Derivatives designated as hedging instruments: Interest rate contracts: Swap agreements 13,714 7,449 Foreign exchange contracts: Forward and swap 6,877 5,221 (1) The notional value of the stable value contracts represents our maximum exposure. However, exposure to various stable value contracts is generally contractually limited to substantially lower amounts than the notional values. (2) Represents grants of deferred value awards to employees; refer to pages 158 to 159 in Note 10 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K.
Schedule of Derivative Assets at Fair Value	The following table presents the fair value of derivative financial instruments, excluding the impact of master netting agreements, recorded in our consolidated statement of condition as of the dates indicated. The impact of master netting agreements is provided in Note 8. Derivative Assets (1) Derivative Liabilities (2) (In millions) September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Derivatives not designated as hedging instruments: Foreign exchange contracts $ 16,345 $ 25,939 $ 15,735 $ 25,811 Other derivative contracts — — 176 157 Total $ 16,345 $ 25,939 $ 15,911 $ 25,968 Derivatives designated as hedging instruments: Foreign exchange contracts $ 108 $ 4 $ — $ 116 Interest rate contracts 4 1 27 42 Total $ 112 $ 5 $ 27 $ 158 (1) Derivative assets are included within other assets in our consolidated statement of condition. (2) Derivative liabilities are included within other liabilities in our consolidated statement of condition.
Schedule of Derivative Liabilities at Fair Value	The following table presents the fair value of derivative financial instruments, excluding the impact of master netting agreements, recorded in our consolidated statement of condition as of the dates indicated. The impact of master netting agreements is provided in Note 8. Derivative Assets (1) Derivative Liabilities (2) (In millions) September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Derivatives not designated as hedging instruments: Foreign exchange contracts $ 16,345 $ 25,939 $ 15,735 $ 25,811 Other derivative contracts — — 176 157 Total $ 16,345 $ 25,939 $ 15,911 $ 25,968 Derivatives designated as hedging instruments: Foreign exchange contracts $ 108 $ 4 $ — $ 116 Interest rate contracts 4 1 27 42 Total $ 112 $ 5 $ 27 $ 158 (1) Derivative assets are included within other assets in our consolidated statement of condition. (2) Derivative liabilities are included within other liabilities in our consolidated statement of condition.
Schedule of Derivatives	The following table shows the carrying amount and associated cumulative basis adjustments related to the application of hedge accounting that is included in the carrying amount of hedged assets and liabilities in fair value hedging relationships: September 30, 2021 Cumulative Fair Value Hedging Adjustment Increasing (Decreasing) the carrying amount (In millions) Carrying Amount of Hedged Assets/Liabilities Active De-designated (1) Long-term debt $ 9,024 $ (14) $ 554 Available-for-sale securities 2,420 4 28 December 31, 2020 Cumulative Fair Value Hedging Adjustment Increasing (Decreasing) the carrying amount (In millions) Carrying Amount of Hedged Assets/Liabilities Active De-designated (1) Long-term debt $ 10,519 $ 3 $ 688 Available-for-sale securities 2,330 2 43 (1) Represents hedged items no longer designated in qualifying fair value hedging relationships for which an associated basis adjustment exists at the balance sheet date.
Impact of Derivative Financial Instruments On Statement of Income	The following table presents the impact of our use of derivative financial instruments on our consolidated statement of income for the periods indicated: Location of Gain (Loss) on Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2021 2020 2021 2020 Derivatives not designated as hedging instruments: Foreign exchange contracts Foreign exchange trading services revenue $ 186 $ 164 $ 617 $ 712 Foreign exchange contracts Interest expense 16 20 53 39 Interest rate contracts Foreign exchange trading services revenue — — 1 3 Other derivative contracts Compensation and employee benefits (35) (39) (158) (151) Total $ 167 $ 145 $ 513 $ 603 The following tables present the impact of our use of derivative financial instruments on our consolidated statement of income for the periods indicated: Three Months Ended September 30, Three Months Ended September 30, 2021 2020 2021 2020 (In millions) Location of Gain (Loss) on Derivative in Consolidated Statement of Income Amount of Gain Hedged Item in Fair Value Hedging Relationship Location of Gain (Loss) on Hedged Item in Consolidated Statement of Income Amount of Gain Derivatives designated as fair value hedges: Interest rate contracts Net interest income $ 15 $ 5 Available-for-sale securities (1) Net interest income $ (17) $ (6) Interest rate contracts Net interest income (7) (19) Long-term debt Net interest income 8 17 Total $ 8 $ (14) $ (9) $ 11 Nine Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (In millions) Location of Gain (Loss) on Derivative in Consolidated Statement of Income Amount of Gain Hedged Item in Fair Value Hedging Relationship Location of Gain (Loss) on Hedged Item in Consolidated Statement of Income Amount of Gain Derivatives designated as fair value hedges: Interest rate contracts Net interest income $ 9 $ (3) Available-for-sale securities (2) Net interest income $ (12) $ — Interest rate contracts Net interest income (26) 564 Long-term debt Net interest income 26 (557) Total $ (17) $ 561 $ 14 $ (557) (1) In the three months ended September 30, 2021, approximately $13 million of net unrealized gains on AFS investment securities designated in fair value hedges was recognized in OCI compared to $4 million of net unrealized gains in the same period in 2020. (2) In the nine months ended September 30, 2021, approximately $9 million of net unrealized gains on AFS investment securities designated in fair value hedges was recognized in OCI compared to no net unrealized gains or losses in the same period in 2020. Three Months Ended September 30, Three Months Ended September 30, 2021 2020 Location of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income 2021 2020 (In millions) Amount of Gain or (Loss) Recognized in Other Comprehensive Income on Derivative Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income Derivatives designated as cash flow hedges: Interest rate contracts (1) $ (3) $ — Net interest income $ 22 $ 18 Foreign exchange contracts 12 (30) Net interest income 2 6 Total derivatives designated as cash flow hedges $ 9 $ (30) $ 24 $ 24 Derivatives designated as net investment hedges: Foreign exchange contracts $ 111 $ (122) Gains (Losses) related to investment securities, net $ — $ — Total derivatives designated as net investment hedges 111 (122) — — Total $ 120 $ (152) $ 24 $ 24 Nine Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (In millions) Amount of Gain or (Loss) Recognized in Other Comprehensive Income on Derivative Location of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income Derivatives designated as cash flow hedges: Interest rate contracts $ (9) 179 Net interest income $ 62 $ 32 Foreign exchange contracts 55 $ (11) Net interest income 8 20 Total derivatives designated as cash flow hedges $ 46 $ 168 $ 70 $ 52 Derivatives designated as net investment hedges: Foreign exchange contracts $ 222 $ (100) Gains (losses) related to investment securities, net $ — $ — Total derivatives designated as net investment hedges 222 (100) — — Total $ 268 $ 68 $ 70 $ 52 (1) As of September 30, 2021, the maximum maturity date of the underlying hedged items is approximately 5.0 years.

Offsetting Arrangements (Tables

Offsetting Arrangements (Tables)	9 Months Ended
	Sep. 30, 2021
Offsetting [Abstract]
Offsetting Assets	The following tables present information about the offsetting of assets related to derivative contracts and secured financing transactions, as of the dates indicated: Assets: September 30, 2021 Gross Amounts of Recognized Assets (1)(2) Gross Amounts Offset in Statement of Condition (3) Net Amounts of Assets Presented in Statement of Condition Gross Amounts Not Offset in Statement of Condition (In millions) Cash and Securities Received (4) Net Amount (5) Derivatives: Foreign exchange contracts $ 16,453 $ (7,667) $ 8,786 $ — $ 8,786 Interest rate contracts (6) 4 — 4 — 4 Cash collateral and securities netting NA (1,225) (1,225) (1,086) (2,311) Total derivatives 16,457 (8,892) 7,565 (1,086) 6,479 Other financial instruments: Resale agreements and securities borrowing (7)(8) 87,099 (57,609) 29,490 (29,242) 248 Total derivatives and other financial instruments $ 103,556 $ (66,501) $ 37,055 $ (30,328) $ 6,727 Assets: December 31, 2020 Gross Amounts of Recognized Assets (1)(2) Gross Amounts Offset in Statement of Condition (3) Net Amounts of Assets Presented in Statement of Condition Gross Amounts Not Offset in Statement of Condition (In millions) Cash and Securities Received (4) Net Amount (5) Derivatives: Foreign exchange contracts $ 25,943 $ (14,271) $ 11,672 $ — $ 11,672 Interest rate contracts (6) 1 — 1 — 1 Cash collateral and securities netting NA (5,869) (5,869) (1,105) (6,974) Total derivatives 25,944 (20,140) 5,804 (1,105) 4,699 Other financial instruments: Resale agreements and securities borrowing (7)(8) 174,461 (153,025) 21,436 (20,568) 868 Total derivatives and other financial instruments $ 200,405 $ (173,165) $ 27,240 $ (21,673) $ 5,567 (1) Amounts include all transactions regardless of whether or not they are subject to an enforceable netting arrangement. (2) Refer to Note 1 and Note 2 for additional information about the measurement basis of derivative instruments. (3) Amounts subject to netting arrangements which have been determined to be legally enforceable and eligible for netting in the consolidated statement of condition. (4) Includes securities in connection with our securities borrowing transactions. (5) Includes amounts secured by collateral not determined to be subject to enforceable netting arrangements. (6) Variation margin payments presented as settlements rather than collateral. (7) Included in the $29.49 billion as of September 30, 2021 were $2.85 billion of resale agreements and $26.64 billion of collateral provided related to securities borrowing. Included in the $21.44 billion as of December 31, 2020 were $3.11 billion of resale agreements and $18.33 billion of collateral provided related to securities borrowing. Resale agreements and collateral provided related to securities borrowing were recorded in securities purchased under resale agreements and other assets, respectively, in our consolidated statement of condition. Refer to Note 9 for additional information with respect to principal securities finance transactions. (8) Offsetting of resale agreements primarily relates to our involvement in FICC, where we settle transactions on a net basis for payment and delivery through the Fedwire system. NA Not applicable
Offsetting Liabilities	The following tables present information about the offsetting of liabilities related to derivative contracts and secured financing transactions, as of the dates indicated: Liabilities: September 30, 2021 Gross Amounts of Recognized Liabilities (1)(2) Gross Amounts Offset in Statement of Condition (3) Net Amounts of Liabilities Presented in Statement of Condition Gross Amounts Not Offset in Statement of Condition (In millions) Cash and Securities Received (4) Net Amount (5) Derivatives: Foreign exchange contracts $ 15,735 $ (7,663) $ 8,072 $ — $ 8,072 Interest rate contracts (6) 27 (4) 23 — 23 Other derivative contracts 176 — 176 — 176 Cash collateral and securities netting NA (3,956) (3,956) (1,269) (5,225) Total derivatives 15,938 (11,623) 4,315 (1,269) 3,046 Other financial instruments: Repurchase agreements and securities lending (7)(8) 66,016 (57,609) 8,407 (7,802) 605 Total derivatives and other financial instruments $ 81,954 $ (69,232) $ 12,722 $ (9,071) $ 3,651 Liabilities: December 31, 2020 Gross Amounts of Recognized Liabilities (1)(2) Gross Amounts Offset in Statement of Condition (3) Net Amounts of Liabilities Presented in Statement of Condition Gross Amounts Not Offset in Statement of Condition (In millions) Cash and Securities Received (4) Net Amount (5) Derivatives: Foreign exchange contracts $ 25,927 $ (14,271) $ 11,656 $ — $ 11,656 Interest rate contracts (6) 42 — 42 — 42 Other derivative contracts 157 — 157 — 157 Cash collateral and securities netting NA (1,287) (1,287) (1,732) (3,019) Total derivatives 26,126 (15,558) 10,568 (1,732) 8,836 Other financial instruments: Repurchase agreements and securities lending (7)(8) 165,793 (153,025) 12,768 (12,448) 320 Total derivatives and other financial instruments $ 191,919 $ (168,583) $ 23,336 $ (14,180) $ 9,156 (1) Amounts include all transactions regardless of whether or not they are subject to an enforceable netting arrangement. (2) Refer to Note 1 and Note 2 for additional information about the measurement basis of derivative instruments. (3) Amounts subject to netting arrangements which have been determined to be legally enforceable and eligible for netting in the consolidated statement of condition. (4) Includes securities provided in connection with our securities lending transactions. (5) Includes amounts secured by collateral not determined to be subject to enforceable netting arrangements. (6) Variation margin payments presented as settlements rather than collateral. (7) Included in the $8.41 billion as of September 30, 2021 were $0.64 billion of repurchase agreements and $7.77 billion of collateral received related to securities lending transactions. Included in the $12.77 billion as of December 31, 2020 were $3.41 billion of repurchase agreements and $9.36 billion of collateral received related to securities lending transactions. Repurchase agreements and collateral received related to securities lending were recorded in securities sold under repurchase agreements and accrued expenses and other liabilities, respectively, in our consolidated statement of condition. Refer to Note 9 for additional information with respect to principal securities finance transactions. (8) Offsetting of repurchase agreements primarily relates to our involvement in FICC, where we settle transactions on a net basis for payment and delivery through the Fedwire system. NA Not applicable
Securities Sold and Securities Loaned Under Repurchase Agreements	The following table summarizes our repurchase agreements and securities lending transactions by category of collateral pledged and remaining maturity of these agreements as of the periods indicated: As of September 30, 2021 As of December 31, 2020 (In millions) Overnight and Continuous Up to 30 Days 30-90 days Greater than 90 Days Total Overnight and Continuous Up to 30 Days 30-90 days Greater than 90 Days Total Repurchase agreements: U.S. Treasury and agency securities $ 53,915 $ — $ — $ — $ 53,915 $ 152,140 $ — $ — $ — $ 152,140 Total 53,915 — — — 53,915 152,140 — — — 152,140 Securities lending transactions: US Treasury and agency securities 2 — — — 2 — — — — — Corporate debt securities 149 — — — 149 110 — — — 110 Equity securities 9,876 54 3 2,016 11,949 7,578 56 1,156 8,790 Other (1) 1 — — — 1 4,753 — — — 4,753 Total 10,028 54 3 2,016 12,101 12,441 56 — 1,156 13,653 Gross amount of recognized liabilities for repurchase agreements and securities lending $ 63,943 $ 54 $ 3 $ 2,016 $ 66,016 $ 164,581 $ 56 $ — $ 1,156 $ 165,793 (1) Represents a security interest in underlying client assets related to our enhanced custody business, which assets clients have allowed us to transfer and re-pledge.

Commitments and Guarantees (Tab

Commitments and Guarantees (Tables)	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of Guarantor Obligations	The following table presents the aggregate gross contractual amounts of our off-balance sheet commitments and off-balance sheet guarantees as of the dates indicated: (In millions) September 30, 2021 December 31, 2020 Commitments: Unfunded credit facilities $ 34,471 $ 34,213 Guarantees (1) : Indemnified securities financing $ 402,369 $ 440,875 Standby letters of credit 3,333 3,330 (1) The potential losses associated with these guarantees equal the gross contractual amounts and do not consider the value of any collateral or reflect any participations to independent third parties.
Schedule of Repurchase Agreements	The following table summarizes the aggregate fair values of indemnified securities financing and related collateral, as well as collateral invested in indemnified repurchase agreements, as of the dates indicated: (In millions) September 30, 2021 December 31, 2020 Fair value of indemnified securities financing $ 402,369 $ 440,875 Fair value of cash and securities held by us, as agent, as collateral for indemnified securities financing 422,882 463,273 Fair value of collateral for indemnified securities financing invested in indemnified repurchase agreements 67,833 54,432 Fair value of cash and securities held by us or our agents as collateral for investments in indemnified repurchase agreements 73,176 58,092

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Schedule of Preferred Shares	The following table summarizes selected terms of each of the series of the preferred stock issued and outstanding as of September 30, 2021: Preferred Stock (1) : Issuance Date Depositary Shares Issued Amount outstanding (in millions) Ownership Interest Per Depositary Share Liquidation Preference Per Share Liquidation Preference Per Depositary Share Per Annum Dividend Rate Dividend Payment Frequency Carrying Value as of September 30, 2021 Redemption Date (2) Series D February 2014 30,000,000 $ 750 1/4,000th $ 100,000 $ 25 5.90% to but excluding March 15, 2024, then a floating rate equal to the three-month LIBOR plus 3.108% Quarterly $ 742 March 15, 2024 Series F (3) May 2015 250,000 250 1/100th 100,000 1,000 5.25% to but excluding September 15, 2020, then a floating rate equal to the three-month LIBOR plus 3.597%, or 3.7130% effective September 15, 2021 Quarterly 247 September 15, 2020 Series G April 2016 20,000,000 500 1/4,000th 100,000 25 5.35% to but excluding March 15, 2026, then a floating rate equal to the three-month LIBOR plus 3.709% Quarterly 493 March 15, 2026 Series H September 2018 500,000 500 1/100th 100,000 1,000 5.625% to but excluding December 15, 2023, then a floating rate equal to the three-month LIBOR plus 2.539% Semi-annually 494 December 15, 2023 (1) The preferred stock and corresponding depositary shares may be redeemed at our option in whole, but not in part, prior to the redemption date upon the occurrence of a regulatory capital treatment event, as defined in the certificate of designation, at a redemption price equal to the liquidation price per share and liquidation price per depositary share plus any declared and unpaid dividends, without accumulation of any undeclared dividends. (2) On the redemption date, or any dividend payment date thereafter, the preferred stock and corresponding depositary shares may be redeemed by us, in whole or in part, at the liquidation price per share and liquidation price per depositary share plus any declared and unpaid dividends, without accumulation of any undeclared dividends. (3) Series F preferred stock is redeemable on September 15, 2020 and on each succeeding dividend payment date. We did not elect redemption on September 15, 2020, December 15, 2020, June 15, 2021 or September 15, 2021.
Dividends Declared	The following table presents the dividends declared for each of the series of preferred stock issued and outstanding for the periods indicated: Three Months Ended September 30, 2021 2020 (Dollars in millions, except per share amounts) Dividends Declared per Share Dividends Declared per Depositary Share Total Dividends Declared per Share Dividends Declared per Depositary Share Total Preferred Stock: Series D $ 1,475 $ 0.37 $ 11 $ 1,475 $ 0.37 $ 11 Series F 950 9.50 2 2,625 26.25 20 Series G 1,338 0.33 7 1,338 0.33 7 Series H — — — — — — Total $ 20 $ 38 Nine Months Ended September 30, 2021 2020 (Dollars in millions, except per share amounts) Dividends Declared per Share Dividends Declared per Depositary Share Total Dividends Declared per Share Dividends Declared per Depositary Share Total Preferred Stock: Series C $ — $ — $ — $ 1,313 $ 0.33 $ 6 Series D 4,425 1.11 33 4,425 1.11 33 Series F 2,869 28.69 11 5,250 52.50 40 Series G 4,014 0.99 21 4,014 0.99 21 Series H 2,813 28.13 14 2,813 28.13 14 Total $ 79 $ 114 The table below presents the dividends declared on common stock for the periods indicated: Three Months Ended September 30, 2021 2020 Dividends Declared per Share Total (In millions) Dividends Declared per Share Total (In millions) Common Stock $ 0.57 $ 209 $ 0.52 $ 184 Nine Months Ended September 30, 2021 2020 Dividends Declared per Share Total (In millions) Dividends Declared per Share Total (In millions) Common Stock $ 1.61 $ 570 $ 1.56 $ 550
Stock Repurchase Program	The tables below present the activity under our common share repurchase program for the periods indicated: Three Months Ended September 30, 2021 Nine Months Ended September 30, 2021 Shares Acquired Average Cost per Share Total Acquired Shares Acquired (In millions) Average Cost per Share Total Acquired (In millions) — $ — $ — 11.2 $ 80.00 $ 900 Three Months Ended September 30, 2020 Nine Months Ended September 30, 2020 Shares Acquired Average Cost per Share Total Acquired Shares Acquired (In millions) Average Cost per Share Total Acquired (In millions) 2019 Program — $ — $ — 6.5 $ 77.35 $ 500
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents the after-tax components of AOCI for the periods indicated: Nine Months Ended September 30, (In millions) 2021 2020 Net unrealized gains (losses) on cash flow hedges $ 41 $ 82 Net unrealized gains (losses) on available-for-sale securities portfolio 353 976 Net unrealized gains (losses) related to reclassified available-for-sale securities (39) (68) Net unrealized gains (losses) on available-for-sale securities 314 908 Net unrealized (losses) on available-for-sale securities designated in fair value hedges (24) (36) Net unrealized gains (losses) on hedges of net investments in non-U.S. subsidiaries 18 (54) Other-than-temporary impairment on held-to-maturity securities related to factors other than credit (2) (2) Net unrealized (losses) on retirement plans (166) (172) Foreign currency translation (863) (837) Total $ (682) $ (111) The following table presents changes in AOCI by component, net of related taxes, for the periods indicated: (In millions) Net Unrealized Gains (Losses) on Cash Flow Hedges Net Unrealized Gains (Losses) on Available-for-Sale Securities Net Unrealized Gains (Losses) on Hedges of Net Investments in Non-U.S. Subsidiaries Other-Than-Temporary Impairment on Held-to-Maturity Securities Net Unrealized Losses on Retirement Plans Foreign Currency Translation Total Balance as of December 31, 2020 $ 57 $ 848 $ (204) $ (2) $ (178) $ (334) $ 187 Other comprehensive income (loss) before reclassifications 35 (558) 222 — — (529) (830) Amounts reclassified into (out of) accumulated other comprehensive loss (51) — — — 12 — (39) Other comprehensive income (loss) (16) (558) 222 — 12 (529) (869) Balance as of September 30, 2021 $ 41 $ 290 $ 18 $ (2) $ (166) $ (863) $ (682) (In millions) Net Unrealized Gains (Losses) on Cash Flow Hedges Net Unrealized Gains (Losses) on Available-for-Sale Securities Net Unrealized Gains (Losses) on Hedges of Net Investments in Non-U.S. Subsidiaries Other-Than-Temporary Impairment on Held-to-Maturity Securities Net Unrealized Losses on Retirement Plans Foreign Currency Translation Total Balance as of December 31, 2019 $ (70) $ 409 $ 46 $ (2) $ (187) $ (1,072) $ (876) Other comprehensive income (loss) before reclassifications 189 462 (100) — — 235 786 Amounts reclassified into (out of) accumulated other comprehensive loss (37) 1 — — 15 — (21) Other comprehensive income (loss) 152 463 (100) — 15 235 765 Balance as of September 30, 2020 $ 82 $ 872 $ (54) $ (2) $ (172) $ (837) $ (111)
Schedule of Reclassifications Out of AOCI	The following table presents after-tax reclassifications into earnings for the periods indicated: Three Months Ended September 30, 2021 2020 (In millions) Amounts Reclassified (into) Affected Line Item in Consolidated Statement of Income Cash flow hedges: (Gain) reclassified from accumulated other comprehensive income into income, net of related taxes of $6 and $7, respectively $ (18) $ (17) Net interest income reclassified from other comprehensive income Retirement plans: Amortization of actuarial losses, net of related taxes of $1 and $1, respectively 2 1 Compensation and employee benefits expenses Total reclassifications into (out of) Accumulated other comprehensive loss $ (16) $ (16) Nine Months Ended September 30, 2021 2020 (In millions) Amounts Reclassified (into) Affected Line Item in Consolidated Statement of Income Available-for-sale securities: Net realized gains (losses) from sales of available-for-sale securities, net of related taxes of $0 and $1, respectively $ — $ 1 Net gains (losses) from sales of available-for-sale securities Cash flow hedges: (Gain) reclassified from accumulated other comprehensive income into income, net of related taxes of $19 and $14, respectively (51) (37) Net interest income reclassified from other comprehensive income Retirement plans: Amortization of actuarial losses, net of related taxes of $5 and $5, respectively 12 15 Compensation and employee benefits expenses Total reclassifications into (out of) Accumulated other comprehensive loss $ (39) $ (21)

Regulatory Capital (Tables)

Regulatory Capital (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2021 Basel III Standardized Approach September 30, 2021 Basel III Advanced Approaches December 31, 2020 Basel III Standardized Approach December 31, 2020 Basel III Advanced Approaches September 30, 2021 Basel III Standardized Approach September 30, 2021 Basel III Advanced Approaches December 31, 2020 Basel III Standardized Approach December 31, 2020 Common shareholders' equity: Common stock and related surplus $ 11,267 $ 11,267 $ 10,709 $ 10,709 $ 12,887 $ 12,887 $ 12,893 $ 12,893 Retained earnings 24,785 24,785 23,442 23,442 14,919 14,919 12,939 12,939 Accumulated other comprehensive income (loss) (682) (682) 187 187 (465) (465) 371 371 Treasury stock, at cost (10,032) (10,032) (10,609) (10,609) — — — — Total 25,338 25,338 23,729 23,729 27,341 27,341 26,203 26,203 Regulatory capital adjustments: Goodwill and other intangible assets, net of associated deferred tax liabilities (9,040) (9,040) (9,019) (9,019) (8,770) (8,770) (8,745) (8,745) Other adjustments (1) (467) (467) (333) (333) (281) (281) (152) (152) Common equity tier 1 capital 15,831 15,831 14,377 14,377 18,290 18,290 17,306 17,306 Preferred stock 1,976 1,976 2,471 2,471 — — — — Tier 1 capital 17,807 17,807 16,848 16,848 18,290 18,290 17,306 17,306 Qualifying subordinated long-term debt 1,590 1,590 961 961 754 754 966 966 Allowance for credit losses — 117 1 148 — 117 10 148 Total capital $ 19,397 $ 19,514 $ 17,810 $ 17,957 $ 19,044 $ 19,161 $ 18,282 $ 18,420 Risk-weighted assets: Credit risk (2) $ 66,503 $ 114,604 $ 63,367 $ 114,892 $ 59,635 $ 111,464 $ 58,960 $ 110,797 Operational risk (3) 45,750 NA 44,150 NA 43,113 NA 43,663 NA Market risk 2,625 2,625 2,188 2,188 2,625 2,625 2,188 2,188 Total risk-weighted assets $ 114,878 $ 117,229 $ 109,705 $ 117,080 $ 105,373 $ 114,089 $ 104,811 $ 112,985 Adjusted quarterly average assets $ 281,952 $ 281,952 $ 263,490 $ 263,490 $ 278,705 $ 278,705 $ 260,489 $ 260,489 Capital Ratios: 2021 Minimum Requirements (4) 2020 Minimum Requirements (4) Common equity tier 1 capital 8.0 % 8.0 % 13.8 % 13.5 % 13.1 % 12.3 % 17.4 % 16.0 % 16.5 % 15.3 % Tier 1 capital 9.5 9.5 15.5 15.2 15.4 14.4 17.4 16.0 16.5 15.3 Total capital 11.5 11.5 16.9 16.6 16.2 15.3 18.1 16.8 17.4 16.3 Tier 1 leverage (5) 4.0 4.0 6.3 6.3 6.4 6.4 6.6 6.6 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) Includes a CVA which reflects the risk of potential fair value adjustments for credit risk reflected in our valuation of 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. 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%. State Street Bank is required to maintain a minimum Tier 1 leverage ratio of 5.0% as it is the insured depository institution subsidiary of State Street Corporation, a U.S. G-SIB. NA Not applicable

Net Interest Income (Tables)

Net Interest Income (Tables)	9 Months Ended
	Sep. 30, 2021
Banking and Thrift, Interest [Abstract]
Components of Interest Revenue and Interest Expense	The following table presents the components of interest income and interest expense, and related NII, for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2021 2020 2021 2020 Interest income: Interest-bearing deposits with banks $ — $ (6) $ (13) $ 79 Investment securities: Investment securities available-for-sale 150 169 435 609 Investment securities held-to-maturity 158 171 501 631 Investment securities purchased under money market liquidity facility — 25 4 103 Total investment securities 308 365 940 1,343 Securities purchased under resale agreements 6 20 19 109 Loans 168 138 466 479 Other interest-earning assets 5 3 13 52 Total interest income 487 520 1,425 2,062 Interest expense: Interest-bearing deposits (62) (61) (196) (47) Short-term borrowings under money market liquidity facility — 23 4 87 Securities sold under repurchase agreements — — — 3 Other short-term borrowings — 2 1 17 Long-term debt 51 69 165 252 Other interest-bearing liabilities 11 9 30 49 Total interest expense — 42 4 361 Net interest income $ 487 $ 478 $ 1,421 $ 1,701

Expenses (Tables)

Expenses (Tables)	9 Months Ended
	Sep. 30, 2021
Other Expenses [Abstract]
Schedule of Expenses	The following table presents the components of other expenses for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2021 2020 2021 2020 Professional services $ 91 $ 89 $ 246 $ 261 Regulatory fees and assessments 16 16 53 45 Sales advertising public relations 13 20 46 50 Securities processing 8 10 22 40 Insurance 3 2 9 10 Bank operations 3 2 7 15 Other 87 90 259 281 Total other expenses $ 221 $ 229 $ 642 $ 702
Restructuring and Related Costs	The following table presents aggregate activity for repositioning charges for the periods indicated: (In millions) Employee Real Estate Asset and Other Write-offs Total Accrual Balance at December 31, 2019 $ 190 $ 7 $ 1 $ 198 Payments and Other Adjustments (33) (1) — (34) Accrual Balance at March 31, 2020 157 6 1 164 Payments and Other Adjustments (25) (1) — (26) Accrual Balance at June 30, 2020 132 5 1 138 Payments and Other Adjustments (10) 1 (1) (10) Accrual Balance at September 30, 2020 $ 122 $ 6 $ — $ 128 Accrual Balance at December 31, 2020 $ 190 $ 6 $ — $ 196 Accruals for Beacon (1) — — (1) Accruals for Repositioning Charges — 2 — 2 Payments and Other Adjustments (9) (2) — (11) Accrual Balance at March 31, 2021 180 6 — 186 Payments and Other Adjustments (34) — — (34) Accrual Balance at June 30, 2021 146 6 — 152 Payments and Other Adjustments (23) — — (23) Accrual Balance at September 30, 2021 $ 123 $ 6 $ — $ 129

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following table presents the computation of basic and diluted earnings per common share for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, (Dollars in millions, except per share amounts) 2021 2020 2021 2020 Net income $ 714 $ 555 $ 1,996 $ 1,883 Less: Preferred stock dividends (21) (38) (85) (123) Dividends and undistributed earnings allocated to participating securities (1) — — (1) (1) Net income available to common shareholders $ 693 $ 517 $ 1,910 $ 1,759 Average common shares outstanding (In thousands): Basic average common shares 347,718 352,586 348,106 352,829 Effect of dilutive securities: equity-based awards 5,776 4,582 5,270 4,142 Diluted average common shares 353,494 357,168 353,376 356,971 Anti-dilutive securities (2) 97 1,309 119 1,351 Earnings per common share: Basic $ 1.99 $ 1.47 $ 5.49 $ 4.99 Diluted (3) 1.96 1.45 5.40 4.93 (1) Represents the portion of net income available to common equity allocated to participating securities, composed of unvested and fully vested SERP (Supplemental executive retirement plans) shares and fully vested deferred director stock awards, which are equity-based awards that contain non-forfeitable rights to dividends, and are considered to participate with the common stock in undistributed earnings. (2) Represents equity-based awards outstanding but not included in the computation of diluted average common shares, because their effect was anti-dilutive. Additional information about equity-based awards is provided on pages 176 and 177 in Note 18 to the consolidated financial statements included under Item 8, Financial Statements and Supplementary Data, in our 2020 Form 10-K. (3) Calculations reflect allocation of earnings to participating securities using the two-class method, as this computation is more dilutive than the treasury stock method.

Line of Business Information (T

Line of Business Information (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Summary of Line of Business Results	The following table is a summary of our line of business results for the periods indicated. The "Other" columns represent costs incurred that are not allocated to a specific line of business, certain employee costs, including certain severance and restructuring costs, acquisition costs and certain provisions for legal contingencies. Three Months Ended September 30, Investment Investment Other Total (Dollars in millions) 2021 2020 2021 2020 2021 2020 2021 2020 Servicing fees $ 1,395 $ 1,301 $ — $ — $ — $ — $ 1,395 $ 1,301 Management fees — — 526 479 — — 526 479 Foreign exchange trading services 266 252 13 18 — — 279 270 Securities finance 103 81 3 3 — — 106 84 Software and processing fees (1) 204 162 (6) 10 — — 198 172 Total fee revenue 1,968 1,796 536 510 — — 2,504 2,306 Net interest income 491 482 (4) (4) — — 487 478 Total other income (1) — — — — — (1) — Total revenue 2,458 2,278 532 506 — — 2,990 2,784 Provision for credit losses (2) — — — — — (2) — Total expenses 1,755 1,739 339 358 22 6 2,116 2,103 Income before income tax expense $ 705 $ 539 $ 193 $ 148 $ (22) $ (6) $ 876 $ 681 Pre-tax margin 29 % 24 % 36 % 29 % 29 % 24 % Nine Months Ended September 30, Investment Investment Other Total (Dollars in millions) 2021 2020 2021 2020 2021 2020 2021 2020 Servicing fees $ 4,165 $ 3,860 $ — $ — $ — $ — $ 4,165 $ 3,860 Management fees — — 1,523 1,387 — — 1,523 1,387 Foreign exchange trading services 869 998 42 41 — — 911 1,039 Securities finance 304 258 10 10 — — 314 268 Software and processing fees (1) 585 528 3 1 — — 588 529 Total fee revenue 5,923 5,644 1,578 1,439 — — 7,501 7,083 Net interest income 1,432 1,716 (11) (15) — — 1,421 1,701 Total other income (1) 2 — — 53 — 52 2 Total revenue 7,354 7,362 1,567 1,424 53 — 8,974 8,786 Provision for credit losses (26) 88 — — — — (26) 88 Total expenses 5,389 5,315 1,082 1,096 88 29 6,559 6,440 Income before income tax expense $ 1,991 $ 1,959 $ 485 $ 328 $ (35) $ (29) 2,441 $ 2,258 Pre-tax margin 27 % 27 % 31 % 23 % 27 % 26 % (1) Investment Management includes other revenue items that are primarily driven by equity market movements.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	In the following tables, revenue is disaggregated by our two lines of business and by revenue stream for which the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. Three Months Ended September 30, 2021 Investment Servicing Investment Management Other Total (Dollars in millions) Topic 606 revenue All other revenue Total Topic 606 revenue All other revenue Total Topic 606 revenue All other revenue Total 2021 Servicing fees $ 1,395 $ — 1,395 $ — $ — $ — $ — $ — $ — $ 1,395 Management fees — — — 526 — 526 — — — 526 Foreign exchange trading services 82 184 266 13 — 13 — — — 279 Securities finance 60 43 103 — 3 3 — — — 106 Software and processing fees 126 78 204 — (6) (6) — — — 198 Total fee revenue 1,663 305 1,968 539 (3) 536 — — — 2,504 Net interest income — 491 491 — (4) (4) — — — 487 Total other income — (1) (1) — — — — — — (1) Total revenue $ 1,663 $ 795 $ 2,458 $ 539 $ (7) $ 532 $ — $ — $ — $ 2,990 Nine Months Ended September 30, 2021 Investment Servicing Investment Management Other Total (Dollars in millions) Topic 606 revenue All other revenue Total Topic 606 revenue All other revenue Total Topic 606 revenue All other revenue Total 2021 Servicing fees $ 4,165 $ — $ 4,165 $ — $ — $ — $ — $ — $ — $ 4,165 Management fees — — — 1,523 — 1,523 — — — 1,523 Foreign exchange trading services 260 609 869 42 — 42 — — — 911 Securities finance 181 123 304 — 10 10 — — — 314 Software and processing fees 390 195 585 — 3 3 — — — 588 Total fee revenue 4,996 927 5,923 1,565 13 1,578 — — — 7,501 Net interest income — 1,432 1,432 — (11) (11) — — — 1,421 Total other income — (1) (1) — — — — 53 53 52 Total revenue $ 4,996 $ 2,358 $ 7,354 $ 1,565 $ 2 $ 1,567 $ — $ 53 $ 53 $ 8,974 Three Months Ended September 30, 2020 Investment Servicing Investment Management Total (Dollars in millions) Topic 606 revenue All other revenue Total Topic 606 revenue All other revenue Total 2020 Servicing fees $ 1,301 $ — $ 1,301 $ — $ — $ — $ 1,301 Management fees — — — 479 — 479 479 Foreign exchange trading services 90 162 252 18 — 18 270 Securities finance 42 39 81 — 3 3 84 Software and processing fees 108 54 162 — 10 10 172 Total fee revenue 1,541 255 1,796 497 13 510 2,306 Net interest income — 482 482 — (4) (4) 478 Total revenue $ 1,541 $ 737 $ 2,278 $ 497 $ 9 $ 506 $ 2,784 Nine Months Ended September 30, 2020 Investment Servicing Investment Management Total (Dollars in millions) Topic 606 revenue All other revenue Total Topic 606 revenue All other revenue Total 2020 Servicing fees $ 3,860 $ — $ 3,860 $ — $ — $ — $ 3,860 Management fees — — — 1,387 — 1,387 1,387 Foreign exchange trading services 285 713 998 41 — 41 1,039 Securities finance 162 96 258 — 10 10 268 Software and processing fees 366 162 528 — 1 1 529 Total fee revenue 4,673 971 5,644 1,428 11 1,439 7,083 Net interest income — 1,716 1,716 — (15) (15) 1,701 Total other income — 2 2 — — — 2 Total revenue $ 4,673 $ 2,689 $ 7,362 $ 1,428 $ (4) $ 1,424 $ 8,786

Non-U.S. Activities (Tables)

Non-U.S. Activities (Tables)	9 Months Ended
	Sep. 30, 2021
Segments, Geographical Areas [Abstract]
Schedule of Results from Non-U.S. Operations	The following table presents our U.S. and non-U.S. financial results for the periods indicated: Three Months Ended September 30, 2021 2020 (In millions) Non-U.S. (1) U.S. Total Non-U.S. (1) U.S. Total Total revenue $ 1,331 $ 1,659 $ 2,990 $ 1,268 $ 1,516 $ 2,784 Income before income tax expense 387 489 876 325 356 681 Nine Months Ended September 30, 2021 2020 (In millions) Non-U.S. (1) U.S. Total Non-U.S. (1) U.S. Total Total revenue $ 3,987 $ 4,987 $ 8,974 $ 3,894 $ 4,892 $ 8,786 Income before income tax expense 1,095 1,346 2,441 1,002 1,256 2,258 (1) Geographic mix is generally based on the domicile of the entity servicing the funds and is not necessarily representative of the underlying asset mix.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) $ in Billions	1 Months Ended
	Sep. 30, 2021USD ($)
BBH Investor Services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Payments for acquisition	$ 3.5

Fair Value - Schedule of Fair V

Fair Value - Schedule of Fair Value Measurements on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	$ 720	$ 815
Investment securities available-for-sale	70,279	59,048
Derivative assets	7,565	5,804
Derivative asset, collateral, cash offset	1,225	5,869
Derivative liability, collateral, cash offset	3,956	1,287
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	720	815
Investment securities available-for-sale	70,279	59,048
Derivative asset, Impact of Netting	(8,892)	(20,140)
Derivative assets	7,565	5,804
Other	652	525
Other assets - impact of netting	0	0
Total, derivative asset	79,216	66,192
Derivative liability, Impact of Netting	(11,623)	(15,558)
Derivative liabilities	4,315	10,568
Total liabilities carried at fair value	4,315	10,572
Recurring | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, Impact of Netting	(8,892)	(20,140)
Derivative assets	7,561	5,803
Derivative liability, Impact of Netting	(11,619)	(15,558)
Derivative liabilities	4,116	10,369
Recurring | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, Impact of Netting	0	0
Derivative assets	4	1
Derivative liability, Impact of Netting	(4)	0
Derivative liabilities	23	42
Recurring | Other derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, Impact of Netting	0	0
Derivative liabilities	176	157
Recurring | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	40	40
Recurring | Non-U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	135	239
Recurring | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	545	536
Investment securities available-for-sale	2,977	3,443
Recurring | US Treasury and federal agencies, direct obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	14,339	6,575
Recurring | US Treasury and federal agencies, mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	16,223	14,305
Recurring | Total U.S. Treasury and federal agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	30,562	20,880
Recurring | Non-U.S. debt securities, mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	2,141	1,996
Recurring | Non-U.S. debt securities, asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	2,365	2,291
Recurring | Non-U.S. sovereign, supranational and non-U.S. agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	22,854	22,087
Recurring | Non-U.S. debt securities, other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	3,306	3,355
Recurring | Total non-U.S. debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	30,666	29,729
Recurring | Asset-backed securities, student loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	231	314
Recurring | Asset-backed securities, collateralized loan obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	4,296	2,966
Recurring | Non-agency CMBS and RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	59	78
Recurring | Asset-backed securities, other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	92	90
Recurring | Total asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	4,678	3,448
Recurring | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	1,396	1,548
Quoted Market Prices in Active Markets (Level 1) | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	40	57
Investment securities available-for-sale	14,339	6,575
Derivative asset	4	1
Other	0	0
Total, derivative asset	14,383	6,633
Derivative liability	2	1
Total liabilities carried at fair value	2	5
Quoted Market Prices in Active Markets (Level 1) | Recurring | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	2	1
Quoted Market Prices in Active Markets (Level 1) | Recurring | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	4	1
Derivative liability	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Other derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	40	40
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	0	17
Investment securities available-for-sale	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | US Treasury and federal agencies, direct obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	14,339	6,575
Quoted Market Prices in Active Markets (Level 1) | Recurring | US Treasury and federal agencies, mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Total U.S. Treasury and federal agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	14,339	6,575
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-U.S. debt securities, mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-U.S. debt securities, asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-U.S. sovereign, supranational and non-U.S. agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-U.S. debt securities, other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Total non-U.S. debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Asset-backed securities, student loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Asset-backed securities, collateralized loan obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-agency CMBS and RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Asset-backed securities, other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Total asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Quoted Market Prices in Active Markets (Level 1) | Recurring | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	680	758
Investment securities available-for-sale	55,940	52,459
Derivative asset	16,451	25,941
Other	652	525
Total, derivative asset	73,723	79,683
Derivative liability	15,936	26,124
Total liabilities carried at fair value	15,936	26,124
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	16,451	25,941
Derivative liability	15,733	25,925
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	27	42
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Other derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	176	157
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	0	0
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Non-U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	135	239
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	545	519
Investment securities available-for-sale	2,977	3,443
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | US Treasury and federal agencies, direct obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | US Treasury and federal agencies, mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	16,223	14,305
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Total U.S. Treasury and federal agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	16,223	14,305
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Non-U.S. debt securities, mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	2,141	1,996
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Non-U.S. debt securities, asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	2,365	2,291
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Non-U.S. sovereign, supranational and non-U.S. agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	22,854	22,087
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Non-U.S. debt securities, other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	3,306	3,355
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Total non-U.S. debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	30,666	29,729
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Asset-backed securities, student loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	231	314
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Asset-backed securities, collateralized loan obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	4,296	2,952
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Non-agency CMBS and RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	59	78
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Asset-backed securities, other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	92	90
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | Total asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	4,678	3,434
Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	1,396	1,548
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	0	0
Investment securities available-for-sale	0	14
Derivative asset	2	2
Other	0	0
Total, derivative asset	2	16
Derivative liability	0	1
Total liabilities carried at fair value	0	1
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	2	2
Derivative liability	0	1
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Other derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	0	0
Investment securities available-for-sale	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | US Treasury and federal agencies, direct obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | US Treasury and federal agencies, mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Total U.S. Treasury and federal agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-U.S. debt securities, mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-U.S. debt securities, asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-U.S. sovereign, supranational and non-U.S. agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-U.S. debt securities, other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Total non-U.S. debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Asset-backed securities, student loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Asset-backed securities, collateralized loan obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	14
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-agency CMBS and RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Asset-backed securities, other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Total asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	14
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	$ 0	0
Other | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading liability		4
Trading liability, Impact of Netting		0
Other | Quoted Market Prices in Active Markets (Level 1) | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading liability		4
Other | Pricing Methods with Significant Observable Market Inputs (Level 2)  | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading liability		0
Other | Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading liability		$ 0

Fair Value - Schedule of Fair_2

Fair Value - Schedule of Fair Value Measurements, Assets, Using Significant Unobservable Inputs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	$ 2	$ 2,792	$ 16	$ 2,756
Total realized and unrealized gain (losses) recorded in revenue	0	(2)	(3)	(7)
Total realized and unrealized gain (losses) recorded in other comprehensive income	0	61	0	27
Purchases	1	672	110	861
Sales	0	(34)	0	(95)
Settlements	(1)	(30)	(1)	(83)
Transfers into Level 3	0	50	15	50
Transfers out of Level 3	0	0	(135)	0
Fair value, end of period	2	3,509	2	3,509
Change in unrealized gains (losses) related to financial instruments held	0	(4)	(1)	(4)
Derivative instruments, assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	2	2	2	4
Total realized and unrealized gain (losses) recorded in revenue	0	(2)	(3)	(7)
Total realized and unrealized gain (losses) recorded in other comprehensive income	0	0	0	0
Purchases	1	9	4	10
Sales	0	0	0	0
Settlements	(1)	(3)	(1)	(1)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair value, end of period	2	6	2	6
Change in unrealized gains (losses) related to financial instruments held	0	(4)	(1)	(4)
Foreign exchange contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	2	2	2	4
Total realized and unrealized gain (losses) recorded in revenue	0	(2)	(3)	(7)
Total realized and unrealized gain (losses) recorded in other comprehensive income	0	0	0	0
Purchases	1	9	4	10
Sales	0	0	0	0
Settlements	(1)	(3)	(1)	(1)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair value, end of period	2	6	2	6
Change in unrealized gains (losses) related to financial instruments held	0	(4)	(1)	(4)
Asset-backed securities, collateralized loan obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period		1,869	14	1,820
Total realized and unrealized gain (losses) recorded in revenue		0	0	0
Total realized and unrealized gain (losses) recorded in other comprehensive income		14	0	(10)
Purchases		663	106	850
Sales		(34)	0	(95)
Settlements		(24)	0	(77)
Transfers into Level 3		50	0	50
Transfers out of Level 3		0	(120)	0
Fair value, end of period	0	2,538	0	2,538
Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period		1,869	14	1,820
Total realized and unrealized gain (losses) recorded in revenue		0	0	0
Total realized and unrealized gain (losses) recorded in other comprehensive income		14	0	(10)
Purchases		663	106	850
Sales		(34)	0	(95)
Settlements		(24)	0	(77)
Transfers into Level 3		50	0	50
Transfers out of Level 3		0	(120)	0
Fair value, end of period	0	2,538	0	2,538
Other U.S. debt securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period			0
Total realized and unrealized gain (losses) recorded in revenue			0
Total realized and unrealized gain (losses) recorded in other comprehensive income			0
Purchases			0
Sales			0
Settlements			0
Transfers into Level 3			15
Transfers out of Level 3			(15)
Fair value, end of period	0		0
Non-U.S. debt securities, asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period		876		887
Total realized and unrealized gain (losses) recorded in revenue		0		0
Total realized and unrealized gain (losses) recorded in other comprehensive income		45		35
Purchases		0		1
Sales		0		0
Settlements		(3)		(5)
Transfers into Level 3		0		0
Transfers out of Level 3		0		0
Fair value, end of period		918		918
Non-U.S. debt securities, other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period		45		45
Total realized and unrealized gain (losses) recorded in revenue		0		0
Total realized and unrealized gain (losses) recorded in other comprehensive income		2		2
Purchases		0		0
Sales		0		0
Settlements		0		0
Transfers into Level 3		0		0
Transfers out of Level 3		0		0
Fair value, end of period		47		47
Total non-U.S. debt securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period		921		932
Total realized and unrealized gain (losses) recorded in revenue		0		0
Total realized and unrealized gain (losses) recorded in other comprehensive income		47		37
Purchases		0		1
Sales		0		0
Settlements		(3)		(5)
Transfers into Level 3		0		0
Transfers out of Level 3		0		0
Fair value, end of period		965		965
Investment securities available-for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period		2,790	14	2,752
Total realized and unrealized gain (losses) recorded in revenue		0	0	0
Total realized and unrealized gain (losses) recorded in other comprehensive income		61	0	27
Purchases		663	106	851
Sales		(34)	0	(95)
Settlements		(27)	0	(82)
Transfers into Level 3		50	15	50
Transfers out of Level 3		0	(135)	0
Fair value, end of period	$ 0	$ 3,503	$ 0	$ 3,503

Fair Value - Fair Value Inputs,

Fair Value - Fair Value Inputs, Assets and Liabilities, Quantitative Information (Details) - Pricing Methods with Significant Unobservable Market Inputs (Level 3) $ in Millions	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Volatility | Option model | Derivative instruments, liabilities | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative liability, measurement input	0.069
Volatility | Option model | Derivative instruments, liabilities | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative liability, measurement input	0.080
Volatility | Option model | Derivative instruments, liabilities | Weighted average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative liability, measurement input	0.074	0.077
Volatility | Option model | Derivative instruments, assets | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative asset, measurement input	0.050
Volatility | Option model | Derivative instruments, assets | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative asset, measurement input	0.126
Volatility | Option model | Derivative instruments, assets | Weighted average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative asset, measurement input	0.076	0.079
Significant Unobservable Inputs Readily Available
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Total, derivative asset	$ 2	$ 2
Total liabilities carried at fair value	0	1
Significant Unobservable Inputs Readily Available | Derivative instruments, liabilities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative instruments, foreign exchange contracts, derivative asset	0	1
Significant Unobservable Inputs Readily Available | Derivative instruments, assets
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative instruments, foreign exchange contracts, derivative asset	$ 2	$ 2

Fair Value - Carrying Value and

Fair Value - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financial Assets:
Cash and due from banks	$ 4,606	$ 3,467
Interest-bearing deposits with banks	107,553	116,960
Securities purchased under resale agreements	2,847	3,106
Investment securities held-to-maturity	43,728	50,003
Financial Liabilities:
Non-interest-bearing	64,885	49,439
Interest-bearing - U.S.	108,909	102,331
Interest-bearing - non-U.S.	85,579	88,028
Securities sold under repurchase agreements	637	3,413
Other short-term borrowings	549	685
Pricing Methods with Significant Observable Market Inputs (Level 2)
Financial Assets:
Net loans (excluding leases)	61
Reported Amount
Financial Assets:
Cash and due from banks	4,606	3,467
Interest-bearing deposits with banks	107,553	116,960
Securities purchased under resale agreements	2,847	3,106
Investment securities held-to-maturity	43,346	48,929
Net loans (excluding leases)	32,702	27,803
Other		4,753
Financial Liabilities:
Non-interest-bearing	64,885	49,439
Interest-bearing - U.S.	108,909	102,331
Interest-bearing - non-U.S.	85,579	88,028
Securities sold under repurchase agreements	637	3,413
Other short-term borrowings	549	685
Long-term debt	12,978	13,805
Other		4,753
Reported Amount  | HTM securities purchased under the MMLF program
Financial Assets:
Investment securities held-to-maturity		3,299
Reported Amount  | Short-term borrowings under the MMLF program
Financial Liabilities:
Other short-term borrowings		3,302
Estimated Fair Value
Financial Assets:
Cash and due from banks	4,606	3,467
Interest-bearing deposits with banks	107,553	116,960
Securities purchased under resale agreements	2,847	3,106
Investment securities held-to-maturity	43,728	50,003
Net loans (excluding leases)	32,806	27,884
Other		4,753
Financial Liabilities:
Non-interest-bearing	64,885	49,439
Interest-bearing - U.S.	108,909	102,331
Interest-bearing - non-U.S.	85,579	88,028
Securities sold under repurchase agreements	637	3,413
Other short-term borrowings	549	685
Long-term debt	13,151	14,162
Other		4,753
Estimated Fair Value | HTM securities purchased under the MMLF program
Financial Assets:
Investment securities held-to-maturity		3,304
Estimated Fair Value | Short-term borrowings under the MMLF program
Financial Liabilities:
Other short-term borrowings		3,302
Estimated Fair Value | Quoted Market Prices in Active Markets (Level 1)
Financial Assets:
Cash and due from banks	4,606	3,467
Interest-bearing deposits with banks	0	0
Securities purchased under resale agreements	0	0
Investment securities held-to-maturity	2,708	6,115
Net loans (excluding leases)	0	0
Other		0
Financial Liabilities:
Non-interest-bearing	0	0
Interest-bearing - U.S.	0	0
Interest-bearing - non-U.S.	0	0
Securities sold under repurchase agreements	0	0
Other short-term borrowings	0	0
Long-term debt	0	0
Other		0
Estimated Fair Value | Quoted Market Prices in Active Markets (Level 1) | HTM securities purchased under the MMLF program
Financial Assets:
Investment securities held-to-maturity		0
Estimated Fair Value | Quoted Market Prices in Active Markets (Level 1) | Short-term borrowings under the MMLF program
Financial Liabilities:
Other short-term borrowings		0
Estimated Fair Value | Pricing Methods with Significant Observable Market Inputs (Level 2)
Financial Assets:
Cash and due from banks	0	0
Interest-bearing deposits with banks	107,553	116,960
Securities purchased under resale agreements	2,847	3,106
Investment securities held-to-maturity	41,020	43,888
Net loans (excluding leases)	30,292	25,668
Other		4,753
Financial Liabilities:
Non-interest-bearing	64,885	49,439
Interest-bearing - U.S.	108,909	102,331
Interest-bearing - non-U.S.	85,579	88,028
Securities sold under repurchase agreements	637	3,413
Other short-term borrowings	549	685
Long-term debt	13,069	14,049
Other		4,753
Estimated Fair Value | Pricing Methods with Significant Observable Market Inputs (Level 2)  | HTM securities purchased under the MMLF program
Financial Assets:
Investment securities held-to-maturity		3,304
Estimated Fair Value | Pricing Methods with Significant Observable Market Inputs (Level 2)  | Short-term borrowings under the MMLF program
Financial Liabilities:
Other short-term borrowings		3,302
Estimated Fair Value | Pricing Methods with Significant Unobservable Market Inputs (Level 3)
Financial Assets:
Cash and due from banks	0	0
Interest-bearing deposits with banks	0	0
Securities purchased under resale agreements	0	0
Investment securities held-to-maturity	0	0
Net loans (excluding leases)	2,514	2,216
Other		0
Financial Liabilities:
Non-interest-bearing	0	0
Interest-bearing - U.S.	0	0
Interest-bearing - non-U.S.	0	0
Securities sold under repurchase agreements	0	0
Other short-term borrowings	0	0
Long-term debt	$ 82	113
Other		0
Estimated Fair Value | Pricing Methods with Significant Unobservable Market Inputs (Level 3) | HTM securities purchased under the MMLF program
Financial Assets:
Investment securities held-to-maturity		0
Estimated Fair Value | Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Short-term borrowings under the MMLF program
Financial Liabilities:
Other short-term borrowings		$ 0

Investment Securities - Narrati

Investment Securities - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)security	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Debt securities, held-to-maturity, allowance for credit loss	$ 2,000,000		$ 2,000,000
Pledged securities not separately reported	$ 77,850,000,000		$ 77,850,000,000		$ 70,570,000,000
Percentage of investment portfolio considered investment grade	99.00%		99.00%
Credit loss expense (reversal)	$ (2,000,000)
HTM securities writeoff	0
Gross pre-tax unrealized losses			$ 505,000,000
Number of securities in loss position | security			722
Held-to-Maturity Securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Credit loss expense (reversal)	$ 0	$ 0	$ (1,000,000)	$ 3,000,000

Investment Securities - Schedul

Investment Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	$ 69,907	$ 57,987
Available for sale, gross unrealized gains	550	1,087
Available for sale, gross unrealized losses	178	26
Available-for-sale, fair value	70,279	59,048
Held to maturity, amortized cost	43,346	48,929
Investment securities held-to-maturity	43,728	50,003
Debt securities, held-to-maturity, allowance for credit loss	2
US Treasury and federal agencies, direct obligations
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	14,372	6,453
Available for sale, gross unrealized gains	30	123
Available for sale, gross unrealized losses	63	1
Available-for-sale, fair value	14,339	6,575
Held to maturity, amortized cost	2,709	6,057
Held to maturity, gross unrealized gains	22	83
Held to maturity, gross unrealized losses	0	0
Investment securities held-to-maturity	2,731	6,140
US Treasury and federal agencies, mortgage-backed securities
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	16,051	13,891
Available for sale, gross unrealized gains	215	421
Available for sale, gross unrealized losses	43	7
Available-for-sale, fair value	16,223	14,305
Held to maturity, amortized cost	33,525	36,901
Held to maturity, gross unrealized gains	525	955
Held to maturity, gross unrealized losses	309	67
Investment securities held-to-maturity	33,741	37,789
Total U.S. Treasury and federal agencies
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	30,423	20,344
Available for sale, gross unrealized gains	245	544
Available for sale, gross unrealized losses	106	8
Available-for-sale, fair value	30,562	20,880
Held to maturity, amortized cost	36,234	42,958
Held to maturity, gross unrealized gains	547	1,038
Held to maturity, gross unrealized losses	309	67
Investment securities held-to-maturity	36,472	43,929
Non-U.S. debt securities, mortgage-backed securities
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	2,130	1,994
Available for sale, gross unrealized gains	12	4
Available for sale, gross unrealized losses	1	2
Available-for-sale, fair value	2,141	1,996
Held to maturity, amortized cost	209	303
Held to maturity, gross unrealized gains	65	68
Held to maturity, gross unrealized losses	2	4
Investment securities held-to-maturity	272	367
Non-U.S. debt securities, asset-backed securities
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	2,365	2,294
Available for sale, gross unrealized gains	2	1
Available for sale, gross unrealized losses	2	4
Available-for-sale, fair value	2,365	2,291
Non-U.S. sovereign, supranational and non-U.S. agency
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	22,747	21,769
Available for sale, gross unrealized gains	150	321
Available for sale, gross unrealized losses	43	3
Available-for-sale, fair value	22,854	22,087
Held to maturity, amortized cost	1,508	342
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	3	0
Investment securities held-to-maturity	1,505	342
Non-U.S. debt securities, other
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	3,294	3,297
Available for sale, gross unrealized gains	29	58
Available for sale, gross unrealized losses	17	0
Available-for-sale, fair value	3,306	3,355
Total non-U.S. debt securities
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	30,536	29,354
Available for sale, gross unrealized gains	193	384
Available for sale, gross unrealized losses	63	9
Available-for-sale, fair value	30,666	29,729
Held to maturity, amortized cost	1,717	645
Held to maturity, gross unrealized gains	65	68
Held to maturity, gross unrealized losses	5	4
Investment securities held-to-maturity	1,777	709
Asset-backed securities, student loans
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	228	313
Available for sale, gross unrealized gains	3	2
Available for sale, gross unrealized losses	0	1
Available-for-sale, fair value	231	314
Held to maturity, amortized cost	5,017	4,774
Held to maturity, gross unrealized gains	64	33
Held to maturity, gross unrealized losses	13	25
Investment securities held-to-maturity	5,068	4,782
Asset-backed securities, collateralized loan obligations
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	4,293	2,969
Available for sale, gross unrealized gains	4	3
Available for sale, gross unrealized losses	1	6
Available-for-sale, fair value	4,296	2,966
Non-agency CMBS and RMBS
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	58	76
Available for sale, gross unrealized gains	1	2
Available for sale, gross unrealized losses	0	0
Available-for-sale, fair value	59	78
Held to maturity, amortized cost	380	554
Held to maturity, gross unrealized gains	31	30
Held to maturity, gross unrealized losses	0	1
Investment securities held-to-maturity	411	583
Asset-backed securities, other
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	90	90
Available for sale, gross unrealized gains	2	0
Available for sale, gross unrealized losses	0	0
Available-for-sale, fair value	92	90
Total asset-backed securities
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	4,669	3,448
Available for sale, gross unrealized gains	10	7
Available for sale, gross unrealized losses	1	7
Available-for-sale, fair value	4,678	3,448
Held to maturity, amortized cost	5,397	5,328
Held to maturity, gross unrealized gains	95	63
Held to maturity, gross unrealized losses	13	26
Investment securities held-to-maturity	5,479	5,365
State and political subdivisions
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	1,336	1,470
Available for sale, gross unrealized gains	63	80
Available for sale, gross unrealized losses	3	2
Available-for-sale, fair value	1,396	1,548
Other U.S. debt securities
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	2,943	3,371
Available for sale, gross unrealized gains	39	72
Available for sale, gross unrealized losses	5	0
Available-for-sale, fair value	2,977	3,443
Total Before MMLF
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Held to maturity, amortized cost	43,348	48,931
Held to maturity, gross unrealized gains	707	1,169
Held to maturity, gross unrealized losses	327	97
Investment securities held-to-maturity	43,728	50,003
Held-to-maturity under money market mutual fund liquidity facility
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Held to maturity, amortized cost	0	3,300
Held to maturity, gross unrealized gains	0	4
Held to maturity, gross unrealized losses	0	0
Investment securities held-to-maturity	0	3,304
Including MMLF
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Held to maturity, amortized cost	43,348	52,231
Held to maturity, gross unrealized gains	707	1,173
Held to maturity, gross unrealized losses	327	97
Investment securities held-to-maturity	43,728	53,307
Non-U.S. debt securities, corporate bonds
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	1,760	1,880
Non-US Collateralized Loan Obiligations [Member]
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	$ 880	960
Federal family education loan program
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Federal government credit support guarantee, percentage minimum	97.00%
State and political subdivisions, securities in trusts
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Investment securities related to state and political subdivisions	$ 610	700
US debt securities, corporate bonds
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost	2,980	3,440
Non-agency CMBS
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Held to maturity, amortized cost	315	464
Non-agency RMBS
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Held to maturity, amortized cost	$ 65	$ 90

Investment Securities - Sched_2

Investment Securities - Schedule of Gross Pre-Tax Unrealized Losses on Investment Securities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	$ 26,519	$ 7,490
Available for sale, gross unrealized losses less than 12 months	171	19
Available for sale, fair value 12 months or longer	872	1,351
Available for sale, gross unrealized losses 12 months or longer	7	7
Available for sale, fair value total	27,391	8,841
Available for sale, gross unrealized losses total	178	26
US Treasury and federal agencies, direct obligations
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	11,538	1,636
Available for sale, gross unrealized losses less than 12 months	63	1
Available for sale, fair value 12 months or longer	0	0
Available for sale, gross unrealized losses 12 months or longer	0	0
Available for sale, fair value total	11,538	1,636
Available for sale, gross unrealized losses total	63	1
US Treasury and federal agencies, mortgage-backed securities
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	3,847	1,394
Available for sale, gross unrealized losses less than 12 months	41	7
Available for sale, fair value 12 months or longer	162	63
Available for sale, gross unrealized losses 12 months or longer	2	0
Available for sale, fair value total	4,009	1,457
Available for sale, gross unrealized losses total	43	7
Total U.S. Treasury and federal agencies
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	15,385	3,030
Available for sale, gross unrealized losses less than 12 months	104	8
Available for sale, fair value 12 months or longer	162	63
Available for sale, gross unrealized losses 12 months or longer	2	0
Available for sale, fair value total	15,547	3,093
Available for sale, gross unrealized losses total	106	8
Non-U.S. debt securities, mortgage-backed securities
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	394	600
Available for sale, gross unrealized losses less than 12 months	1	1
Available for sale, fair value 12 months or longer	33	120
Available for sale, gross unrealized losses 12 months or longer	0	1
Available for sale, fair value total	427	720
Available for sale, gross unrealized losses total	1	2
Non-U.S. debt securities, asset-backed securities
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	646	1,015
Available for sale, gross unrealized losses less than 12 months	1	3
Available for sale, fair value 12 months or longer	464	446
Available for sale, gross unrealized losses 12 months or longer	1	1
Available for sale, fair value total	1,110	1,461
Available for sale, gross unrealized losses total	2	4
Non-U.S. sovereign, supranational and non-U.S. agency
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	5,631	489
Available for sale, gross unrealized losses less than 12 months	42	0
Available for sale, fair value 12 months or longer	39	0
Available for sale, gross unrealized losses 12 months or longer	1	0
Available for sale, fair value total	5,670	489
Available for sale, gross unrealized losses total	43	0
Non-U.S. debt securities, other
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	1,291	715
Available for sale, gross unrealized losses less than 12 months	17	3
Available for sale, fair value 12 months or longer	67	80
Available for sale, gross unrealized losses 12 months or longer	0	0
Available for sale, fair value total	1,358	795
Available for sale, gross unrealized losses total	17	3
Total non-U.S. debt securities
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	7,962	2,819
Available for sale, gross unrealized losses less than 12 months	61	7
Available for sale, fair value 12 months or longer	603	646
Available for sale, gross unrealized losses 12 months or longer	2	2
Available for sale, fair value total	8,565	3,465
Available for sale, gross unrealized losses total	63	9
Asset-backed securities, student loans
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months		31
Available for sale, gross unrealized losses less than 12 months		0
Available for sale, fair value 12 months or longer		197
Available for sale, gross unrealized losses 12 months or longer		1
Available for sale, fair value total		228
Available for sale, gross unrealized losses total		1
Asset-backed securities, collateralized loan obligations
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	2,516	1,498
Available for sale, gross unrealized losses less than 12 months	1	4
Available for sale, fair value 12 months or longer	62	369
Available for sale, gross unrealized losses 12 months or longer	0	2
Available for sale, fair value total	2,578	1,867
Available for sale, gross unrealized losses total	1	6
Asset-backed securities
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	2,516	1,529
Available for sale, gross unrealized losses less than 12 months	1	4
Available for sale, fair value 12 months or longer	62	566
Available for sale, gross unrealized losses 12 months or longer	0	3
Available for sale, fair value total	2,578	2,095
Available for sale, gross unrealized losses total	1	7
State and political subdivisions
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	83	95
Available for sale, gross unrealized losses less than 12 months	0	0
Available for sale, fair value 12 months or longer	45	76
Available for sale, gross unrealized losses 12 months or longer	3	2
Available for sale, fair value total	128	171
Available for sale, gross unrealized losses total	3	2
Other U.S. debt securities
Gross Pre-Tax Unrealized Losses On Investment Securities [Line Items]
Available for sale, fair value less than 12 months	573	17
Available for sale, gross unrealized losses less than 12 months	5	0
Available for sale, fair value 12 months or longer	0	0
Available for sale, gross unrealized losses 12 months or longer	0	0
Available for sale, fair value total	573	17
Available for sale, gross unrealized losses total	$ 5	$ 0

Investment Securities - Sched_3

Investment Securities - Schedule of Contractual Maturities of Debt Securities (Details) $ in Millions	Sep. 30, 2021USD ($)
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	$ 10,327
Available for sale, under 1 year, fair value	10,354
Available for sale, 1 to 5 years, amortized cost	33,436
Available for sale, 1 to 5 years, fair value	33,557
Available for sale, 6 to 10 years, amortized cost	13,336
Available for sale, 6 to 10 years, fair value	13,413
Available for sale, over 10 years, amortized cost	12,808
Available for sale, over 10 years, fair value	12,955
Available for sale, amortized cost	69,907
Available for sale, fair value	70,279
US Treasury and federal agencies, direct obligations
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	2,112
Available for sale, under 1 year, fair value	2,114
Available for sale, 1 to 5 years, amortized cost	11,214
Available for sale, 1 to 5 years, fair value	11,169
Available for sale, 6 to 10 years, amortized cost	1,046
Available for sale, 6 to 10 years, fair value	1,056
Available for sale, over 10 years, amortized cost	0
Available for sale, over 10 years, fair value	0
Available for sale, amortized cost	14,372
Available for sale, fair value	14,339
Held to maturity, under 1 year, amortized cost	2,387
Held to maturity, under 1 year, fair value	2,403
Held to maturity, 1 to 5 years, amortized cost	304
Held to maturity, 1 to 5 years, fair value	309
Held to maturity, 6 to 10 years, amortized cost	0
Held to maturity, 6 to 10 years, fair value	0
Held to maturity, over 10 years, amortized cost	18
Held to maturity, over 10 years, fair value	19
Held to maturity, amortized cost	2,709
Held to maturity, fair value	2,731
US Treasury and federal agencies, mortgage-backed securities
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	83
Available for sale, under 1 year, fair value	87
Available for sale, 1 to 5 years, amortized cost	845
Available for sale, 1 to 5 years, fair value	855
Available for sale, 6 to 10 years, amortized cost	6,227
Available for sale, 6 to 10 years, fair value	6,248
Available for sale, over 10 years, amortized cost	8,896
Available for sale, over 10 years, fair value	9,033
Available for sale, amortized cost	16,051
Available for sale, fair value	16,223
Held to maturity, under 1 year, amortized cost	171
Held to maturity, under 1 year, fair value	177
Held to maturity, 1 to 5 years, amortized cost	285
Held to maturity, 1 to 5 years, fair value	290
Held to maturity, 6 to 10 years, amortized cost	4,528
Held to maturity, 6 to 10 years, fair value	4,509
Held to maturity, over 10 years, amortized cost	28,541
Held to maturity, over 10 years, fair value	28,765
Held to maturity, amortized cost	33,525
Held to maturity, fair value	33,741
Total U.S. Treasury and federal agencies
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	2,195
Available for sale, under 1 year, fair value	2,201
Available for sale, 1 to 5 years, amortized cost	12,059
Available for sale, 1 to 5 years, fair value	12,024
Available for sale, 6 to 10 years, amortized cost	7,273
Available for sale, 6 to 10 years, fair value	7,304
Available for sale, over 10 years, amortized cost	8,896
Available for sale, over 10 years, fair value	9,033
Available for sale, amortized cost	30,423
Available for sale, fair value	30,562
Held to maturity, under 1 year, amortized cost	2,558
Held to maturity, under 1 year, fair value	2,580
Held to maturity, 1 to 5 years, amortized cost	589
Held to maturity, 1 to 5 years, fair value	599
Held to maturity, 6 to 10 years, amortized cost	4,528
Held to maturity, 6 to 10 years, fair value	4,509
Held to maturity, over 10 years, amortized cost	28,559
Held to maturity, over 10 years, fair value	28,784
Held to maturity, amortized cost	36,234
Held to maturity, fair value	36,472
Non-U.S. debt securities, mortgage-backed securities
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	212
Available for sale, under 1 year, fair value	213
Available for sale, 1 to 5 years, amortized cost	540
Available for sale, 1 to 5 years, fair value	543
Available for sale, 6 to 10 years, amortized cost	40
Available for sale, 6 to 10 years, fair value	40
Available for sale, over 10 years, amortized cost	1,338
Available for sale, over 10 years, fair value	1,345
Available for sale, amortized cost	2,130
Available for sale, fair value	2,141
Held to maturity, under 1 year, amortized cost	38
Held to maturity, under 1 year, fair value	37
Held to maturity, 1 to 5 years, amortized cost	18
Held to maturity, 1 to 5 years, fair value	18
Held to maturity, 6 to 10 years, amortized cost	0
Held to maturity, 6 to 10 years, fair value	0
Held to maturity, over 10 years, amortized cost	153
Held to maturity, over 10 years, fair value	217
Held to maturity, amortized cost	209
Held to maturity, fair value	272
Non-U.S. debt securities, asset-backed securities
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	271
Available for sale, under 1 year, fair value	271
Available for sale, 1 to 5 years, amortized cost	1,286
Available for sale, 1 to 5 years, fair value	1,287
Available for sale, 6 to 10 years, amortized cost	415
Available for sale, 6 to 10 years, fair value	415
Available for sale, over 10 years, amortized cost	393
Available for sale, over 10 years, fair value	392
Available for sale, amortized cost	2,365
Available for sale, fair value	2,365
Non-U.S. sovereign, supranational and non-U.S. agency
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	5,828
Available for sale, under 1 year, fair value	5,835
Available for sale, 1 to 5 years, amortized cost	13,987
Available for sale, 1 to 5 years, fair value	14,081
Available for sale, 6 to 10 years, amortized cost	2,917
Available for sale, 6 to 10 years, fair value	2,923
Available for sale, over 10 years, amortized cost	15
Available for sale, over 10 years, fair value	15
Available for sale, amortized cost	22,747
Available for sale, fair value	22,854
Held to maturity, under 1 year, amortized cost	275
Held to maturity, under 1 year, fair value	275
Held to maturity, 1 to 5 years, amortized cost	1,232
Held to maturity, 1 to 5 years, fair value	1,229
Held to maturity, 6 to 10 years, amortized cost	1
Held to maturity, 6 to 10 years, fair value	1
Held to maturity, over 10 years, amortized cost	0
Held to maturity, over 10 years, fair value	0
Held to maturity, amortized cost	1,508
Held to maturity, fair value	1,505
Non-U.S. debt securities, other
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	786
Available for sale, under 1 year, fair value	790
Available for sale, 1 to 5 years, amortized cost	2,077
Available for sale, 1 to 5 years, fair value	2,089
Available for sale, 6 to 10 years, amortized cost	375
Available for sale, 6 to 10 years, fair value	371
Available for sale, over 10 years, amortized cost	56
Available for sale, over 10 years, fair value	56
Available for sale, amortized cost	3,294
Available for sale, fair value	3,306
Total non-U.S. debt securities
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	7,097
Available for sale, under 1 year, fair value	7,109
Available for sale, 1 to 5 years, amortized cost	17,890
Available for sale, 1 to 5 years, fair value	18,000
Available for sale, 6 to 10 years, amortized cost	3,747
Available for sale, 6 to 10 years, fair value	3,749
Available for sale, over 10 years, amortized cost	1,802
Available for sale, over 10 years, fair value	1,808
Available for sale, amortized cost	30,536
Available for sale, fair value	30,666
Held to maturity, under 1 year, amortized cost	313
Held to maturity, under 1 year, fair value	312
Held to maturity, 1 to 5 years, amortized cost	1,250
Held to maturity, 1 to 5 years, fair value	1,247
Held to maturity, 6 to 10 years, amortized cost	1
Held to maturity, 6 to 10 years, fair value	1
Held to maturity, over 10 years, amortized cost	153
Held to maturity, over 10 years, fair value	217
Held to maturity, amortized cost	1,717
Held to maturity, fair value	1,777
Asset-backed securities, student loans
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	129
Available for sale, under 1 year, fair value	131
Available for sale, 1 to 5 years, amortized cost	0
Available for sale, 1 to 5 years, fair value	0
Available for sale, 6 to 10 years, amortized cost	0
Available for sale, 6 to 10 years, fair value	0
Available for sale, over 10 years, amortized cost	99
Available for sale, over 10 years, fair value	100
Available for sale, amortized cost	228
Available for sale, fair value	231
Held to maturity, under 1 year, amortized cost	349
Held to maturity, under 1 year, fair value	343
Held to maturity, 1 to 5 years, amortized cost	110
Held to maturity, 1 to 5 years, fair value	109
Held to maturity, 6 to 10 years, amortized cost	1,071
Held to maturity, 6 to 10 years, fair value	1,088
Held to maturity, over 10 years, amortized cost	3,487
Held to maturity, over 10 years, fair value	3,528
Held to maturity, amortized cost	5,017
Held to maturity, fair value	5,068
Asset-backed securities, collateralized loan obligations
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	29
Available for sale, under 1 year, fair value	30
Available for sale, 1 to 5 years, amortized cost	760
Available for sale, 1 to 5 years, fair value	761
Available for sale, 6 to 10 years, amortized cost	1,656
Available for sale, 6 to 10 years, fair value	1,656
Available for sale, over 10 years, amortized cost	1,848
Available for sale, over 10 years, fair value	1,849
Available for sale, amortized cost	4,293
Available for sale, fair value	4,296
Non-agency CMBS and RMBS
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	0
Available for sale, under 1 year, fair value	0
Available for sale, 1 to 5 years, amortized cost	0
Available for sale, 1 to 5 years, fair value	0
Available for sale, 6 to 10 years, amortized cost	0
Available for sale, 6 to 10 years, fair value	0
Available for sale, over 10 years, amortized cost	58
Available for sale, over 10 years, fair value	59
Available for sale, amortized cost	58
Available for sale, fair value	59
Held to maturity, under 1 year, amortized cost	127
Held to maturity, under 1 year, fair value	140
Held to maturity, 1 to 5 years, amortized cost	158
Held to maturity, 1 to 5 years, fair value	160
Held to maturity, 6 to 10 years, amortized cost	2
Held to maturity, 6 to 10 years, fair value	2
Held to maturity, over 10 years, amortized cost	93
Held to maturity, over 10 years, fair value	109
Held to maturity, amortized cost	380
Held to maturity, fair value	411
Asset-backed securities, other
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	0
Available for sale, under 1 year, fair value	0
Available for sale, 1 to 5 years, amortized cost	0
Available for sale, 1 to 5 years, fair value	0
Available for sale, 6 to 10 years, amortized cost	90
Available for sale, 6 to 10 years, fair value	92
Available for sale, over 10 years, amortized cost	0
Available for sale, over 10 years, fair value	0
Available for sale, amortized cost	90
Available for sale, fair value	92
Total asset-backed securities
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	158
Available for sale, under 1 year, fair value	161
Available for sale, 1 to 5 years, amortized cost	760
Available for sale, 1 to 5 years, fair value	761
Available for sale, 6 to 10 years, amortized cost	1,746
Available for sale, 6 to 10 years, fair value	1,748
Available for sale, over 10 years, amortized cost	2,005
Available for sale, over 10 years, fair value	2,008
Available for sale, amortized cost	4,669
Available for sale, fair value	4,678
Held to maturity, under 1 year, amortized cost	476
Held to maturity, under 1 year, fair value	483
Held to maturity, 1 to 5 years, amortized cost	268
Held to maturity, 1 to 5 years, fair value	269
Held to maturity, 6 to 10 years, amortized cost	1,073
Held to maturity, 6 to 10 years, fair value	1,090
Held to maturity, over 10 years, amortized cost	3,580
Held to maturity, over 10 years, fair value	3,637
Held to maturity, amortized cost	5,397
Held to maturity, fair value	5,479
State and political subdivisions
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	159
Available for sale, under 1 year, fair value	160
Available for sale, 1 to 5 years, amortized cost	544
Available for sale, 1 to 5 years, fair value	563
Available for sale, 6 to 10 years, amortized cost	528
Available for sale, 6 to 10 years, fair value	567
Available for sale, over 10 years, amortized cost	105
Available for sale, over 10 years, fair value	106
Available for sale, amortized cost	1,336
Available for sale, fair value	1,396
Other U.S. debt securities
Contractual Maturities Of Debt Investment Securities [Line Items]
Available for sale, under 1 year, amortized cost	718
Available for sale, under 1 year, fair value	723
Available for sale, 1 to 5 years, amortized cost	2,183
Available for sale, 1 to 5 years, fair value	2,209
Available for sale, 6 to 10 years, amortized cost	42
Available for sale, 6 to 10 years, fair value	45
Available for sale, over 10 years, amortized cost	0
Available for sale, over 10 years, fair value	0
Available for sale, amortized cost	2,943
Available for sale, fair value	2,977
Total
Contractual Maturities Of Debt Investment Securities [Line Items]
Held to maturity, under 1 year, amortized cost	3,347
Held to maturity, under 1 year, fair value	3,375
Held to maturity, 1 to 5 years, amortized cost	2,107
Held to maturity, 1 to 5 years, fair value	2,115
Held to maturity, 6 to 10 years, amortized cost	5,602
Held to maturity, 6 to 10 years, fair value	5,600
Held to maturity, over 10 years, amortized cost	32,292
Held to maturity, over 10 years, fair value	32,638
Held to maturity, amortized cost	43,348
Held to maturity, fair value	$ 43,728

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses - Net Loans (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 32,797	$ 27,925
Allowance for credit losses	(95)	(122)
Loans, net of allowance	32,702	27,803
Geographic Distribution, Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	22,650	21,132
Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	10,147	6,793
Fund Finance | Geographic Distribution, Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	12,367	11,531
Fund Finance | Geographic Distribution, Domestic | Real Money Funds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	6,282	6,391
Fund Finance | Geographic Distribution, Domestic | Private Equity Capital Call Finance Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	9,752	8,380
Fund Finance | Geographic Distribution, Domestic | Business Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	993	821
Fund Finance | Geographic Distribution, Domestic | Collateralized Loan Obligations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,412
Fund Finance | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	7,368	4,432
Leveraged loans | Geographic Distribution, Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	3,407	2,923
Leveraged loans | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,317	1,242
Overdrafts | Geographic Distribution, Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,352	1,894
Overdrafts | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,462	1,088
Other | Securities Finance Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,532	1,911
Other | Municipal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	589	754
Other | Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	19	54
Other | Geographic Distribution, Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,140	2,688
Other | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	0	31
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,384	2,096
Commercial real estate | Geographic Distribution, Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 2,384	$ 2,096

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)loanloanSegment	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)loan
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans and leases segments | loanSegment			2
Loans and leases pledged as collateral	$ 9,000		$ 9,000		$ 8,070
Number of loans on non-accrual status | loan	0		0		0
Sale of loans			$ 64	$ 242
Loss on sale of loans			$ (46)
Number of loans classified as doubtful and pending settlement | loan	1		1
Doubtful loans	$ 32,797		$ 32,797		$ 27,925
Loans modified in troubled debt restructurings | loan	0
Loans no longer meeting similar risk of collective pool | loan	9		9
Loans no longer meeting similar risk of collective pool, amount	$ 232		$ 232
Allowance for credit loss	$ 95		$ 95		122
Investment grade loans	82.00%		82.00%
Speculative grade loans	17.00%		17.00%
Speculative senior secured loans with BB or B rating	88.00%		88.00%
Allowance for credit loss, period increase (decrease)	$ (4)	$ 10
Provision for credit losses	(2)
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Doubtful loans	15		$ 15		17
Collateralized Loan Obligations
Financing Receivable, Credit Quality Indicator [Line Items]
Payments to acquire CLO loans	832
Leveraged Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Sale of loans	84
Commercial and Financial Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Doubtful loans	30,413		30,413		25,829
Allowance for credit loss	13		13
Commercial and Financial Segment | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Doubtful loans	$ 15		$ 15		$ 17

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses - Investments by Credit Quality (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	$ 32,797	$ 27,925
Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	26,899	22,583
Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	5,563	5,224
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	156	67
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	164	34
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	15	17
Commercial and Financial Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	30,413	25,829
Commercial and Financial Segment | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	24,936	20,859
Commercial and Financial Segment | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	5,180	4,852
Commercial and Financial Segment | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	118	67
Commercial and Financial Segment | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	164	34
Commercial and Financial Segment | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	15	17
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	2,384	2,096
Commercial Real Estate | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,963	1,724
Commercial Real Estate | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	383	372
Commercial Real Estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	38	0
Commercial Real Estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	0	0
Commercial Real Estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	0	0
Geographic Distribution, Domestic
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	22,650	21,132
Geographic Distribution, Domestic | Commercial and Financial Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	20,266	19,036
Geographic Distribution, Domestic | Commercial and Financial Segment | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	16,343	15,489
Geographic Distribution, Domestic | Commercial and Financial Segment | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	3,664	3,446
Geographic Distribution, Domestic | Commercial and Financial Segment | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	118	67
Geographic Distribution, Domestic | Commercial and Financial Segment | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	141	34
Geographic Distribution, Domestic | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	2,384	2,096
Geographic Distribution, Domestic | Commercial Real Estate | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,963	1,723
Geographic Distribution, Domestic | Commercial Real Estate | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	383	373
Geographic Distribution, Domestic | Commercial Real Estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	38
Geographic Distribution, Domestic | Loans to investment funds
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	12,367	11,531
Overdrafts	$ 3,814	$ 2,982

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses - Amortized Cost Basis (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	$ 8,199	$ 3,935
Financing receivable, originated, year two	867	2,313
Financing receivable, originated, year three	2,079	1,918
Financing receivable, originated, year four	1,598	1,272
Financing receivable, originated, year five	1,055	495
Financing receivable, originated more than five years before current fiscal year	323	95
Revolving Loans	18,676	17,897
Loans, gross	32,797	27,925
Interest income	82	72
Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	26,899	22,583
Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	5,563	5,224
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	156	67
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	164	34
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	15	17
Geographic Distribution, Domestic
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	22,650	21,132
Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	10,147	6,793
Commercial and Financial Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	30,413	25,829
Commercial and Financial Segment | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	24,936	20,859
Commercial and Financial Segment | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	5,180	4,852
Commercial and Financial Segment | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	118	67
Commercial and Financial Segment | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	164	34
Commercial and Financial Segment | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	15	17
Commercial and Financial Segment | Geographic Distribution, Domestic
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	3,670	2,326
Financing receivable, originated, year two	492	1,363
Financing receivable, originated, year three	1,236	826
Financing receivable, originated, year four	606	816
Financing receivable, originated, year five	618	272
Financing receivable, originated more than five years before current fiscal year	67	0
Revolving Loans	13,577	13,433
Loans, gross	20,266	19,036
Commercial and Financial Segment | Geographic Distribution, Domestic | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	2,696	1,894
Financing receivable, originated, year two	14	388
Financing receivable, originated, year three	376	4
Financing receivable, originated, year four	2	167
Financing receivable, originated, year five	135	200
Financing receivable, originated more than five years before current fiscal year	0	0
Revolving Loans	13,120	12,836
Loans, gross	16,343	15,489
Commercial and Financial Segment | Geographic Distribution, Domestic | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	974	432
Financing receivable, originated, year two	473	942
Financing receivable, originated, year three	719	822
Financing receivable, originated, year four	519	610
Financing receivable, originated, year five	455	43
Financing receivable, originated more than five years before current fiscal year	67	0
Revolving Loans	457	597
Loans, gross	3,664	3,446
Commercial and Financial Segment | Geographic Distribution, Domestic | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0	0
Financing receivable, originated, year two	0	28
Financing receivable, originated, year three	70	0
Financing receivable, originated, year four	29	39
Financing receivable, originated, year five	19	0
Financing receivable, originated more than five years before current fiscal year	0	0
Revolving Loans	0	0
Loans, gross	118	67
Commercial and Financial Segment | Geographic Distribution, Domestic | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0	0
Financing receivable, originated, year two	5	5
Financing receivable, originated, year three	71	0
Financing receivable, originated, year four	56	0
Financing receivable, originated, year five	9	29
Financing receivable, originated more than five years before current fiscal year	0	0
Revolving Loans	0	0
Loans, gross	141	34
Commercial and Financial Segment | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	4,088	1,311
Financing receivable, originated, year two	197	401
Financing receivable, originated, year three	294	346
Financing receivable, originated, year four	277	179
Financing receivable, originated, year five	161	26
Financing receivable, originated more than five years before current fiscal year	31	66
Revolving Loans	5,099	4,464
Loans, gross	10,147	6,793
Commercial and Financial Segment | Non-U.S. | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	3,655	1,028
Financing receivable, originated, year two	0	0
Financing receivable, originated, year three	0	0
Financing receivable, originated, year four	0	0
Financing receivable, originated, year five	0	0
Financing receivable, originated more than five years before current fiscal year	0	0
Revolving Loans	4,938	4,343
Loans, gross	8,593	5,371
Commercial and Financial Segment | Non-U.S. | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	433	283
Financing receivable, originated, year two	197	401
Financing receivable, originated, year three	294	346
Financing receivable, originated, year four	254	162
Financing receivable, originated, year five	146	26
Financing receivable, originated more than five years before current fiscal year	31	66
Revolving Loans	161	121
Loans, gross	1,516	1,405
Commercial and Financial Segment | Non-U.S. | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0
Financing receivable, originated, year two	0
Financing receivable, originated, year three	0
Financing receivable, originated, year four	23
Financing receivable, originated, year five	0
Financing receivable, originated more than five years before current fiscal year	0
Revolving Loans	0
Loans, gross	23
Commercial and Financial Segment | Non-U.S. | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0	0
Financing receivable, originated, year two	0	0
Financing receivable, originated, year three	0	0
Financing receivable, originated, year four	0	17
Financing receivable, originated, year five	15	0
Financing receivable, originated more than five years before current fiscal year	0	0
Revolving Loans	0	0
Loans, gross	15	17
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	2,384	2,096
Commercial real estate | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,963	1,724
Commercial real estate | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	383	372
Commercial real estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	38	0
Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	0	0
Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	0	0
Commercial real estate | Geographic Distribution, Domestic
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	441	298
Financing receivable, originated, year two	178	549
Financing receivable, originated, year three	549	746
Financing receivable, originated, year four	715	277
Financing receivable, originated, year five	276	197
Financing receivable, originated more than five years before current fiscal year	225	29
Revolving Loans	0	0
Loans, gross	2,384	2,096
Commercial real estate | Geographic Distribution, Domestic | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	321	178
Financing receivable, originated, year two	129	383
Financing receivable, originated, year three	383	688
Financing receivable, originated, year four	657	277
Financing receivable, originated, year five	276	197
Financing receivable, originated more than five years before current fiscal year	197	0
Revolving Loans	0	0
Loans, gross	1,963	1,723
Commercial real estate | Geographic Distribution, Domestic | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	120	120
Financing receivable, originated, year two	49	166
Financing receivable, originated, year three	166	58
Financing receivable, originated, year four	20	0
Financing receivable, originated, year five	0	0
Financing receivable, originated more than five years before current fiscal year	28	29
Revolving Loans	0	0
Loans, gross	383	$ 373
Commercial real estate | Geographic Distribution, Domestic | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0
Financing receivable, originated, year two	0
Financing receivable, originated, year three	0
Financing receivable, originated, year four	38
Financing receivable, originated, year five	0
Financing receivable, originated more than five years before current fiscal year	0
Revolving Loans	0
Loans, gross	$ 38

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses - Activity in the Allowance for Credit Losses for Loans Held for Investment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			$ 122
Provision	$ (2)
Ending balance	95		95
Leveraged Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	74	$ 113	97	$ 61
Charge-offs	(1)	(14)	(2)	(33)
Provision	(4)	3	(24)	73
Other	(1)		(3)
Foreign currency translation		4		5
Ending balance	68	106	68	106
Other Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12	20	17	10
Charge-offs	0	0	0	0
Provision	0	0	(5)	10
Other	0		0
Foreign currency translation		0		0
Ending balance	12	20	12	20
Other Loans | Fund Finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	11	15	11	15
Other Loans | Other Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	1	5	1	5
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14	8	8	2
Charge-offs	0	0	0	0
Provision	1	0	7	6
Other	0		0
Foreign currency translation		0		0
Ending balance	15	8	15	8
Held-to-Maturity Securities
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2	3	3	0
Charge-offs	0	0	0	0
Provision	0	0	(1)	3
Other	0		0
Foreign currency translation		0		0
Ending balance	2	3	2	3
Off-Balance Sheet Commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	19	18	22	19
Charge-offs	0	0	0	0
Provision	1	(3)	(2)	(4)
Other	0		0
Foreign currency translation		0		0
Ending balance	20	15	20	15
All Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0	1	1	1
Charge-offs	0	0	0	0
Provision	0	0	(1)	0
Other	0		0
Foreign currency translation		0		0
Ending balance	0	1	0	1
Total
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	121	163	148	93
Charge-offs	(1)	(14)	(2)	(33)
Provision	(2)	0	(26)	88
Other	(1)		(3)
Foreign currency translation		4		5
Ending balance	$ 117	$ 153	$ 117	$ 153

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Changes In The Carrying Amount Of Goodwill (Details) € in Millions, $ in Millions	3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Mar. 31, 2021EUR (€)	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Goodwill [Roll Forward]
Beginning balance		$ 7,683		$ 7,683	$ 7,556
Foreign currency translation				(82)	127
Acquisitions				66
Divestitures				(17)
Ending balance	$ 7,650			7,650	7,683
Investment Servicing
Goodwill [Roll Forward]
Beginning balance		7,413		7,413	7,289
Foreign currency translation				(80)	124
Acquisitions				66
Divestitures				(17)
Ending balance	7,382			7,382	7,413
Investment Servicing | Fideuram Bank Luxembour
Goodwill [Roll Forward]
Payment for acquisition		258	€ 220
Investment Servicing | Mercatus, Inc
Goodwill [Roll Forward]
Payment for acquisition	88
Investment Management
Goodwill [Roll Forward]
Beginning balance		$ 270		270	267
Foreign currency translation				(2)	3
Acquisitions				0
Divestitures				0
Ending balance	$ 268			$ 268	$ 270

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Changes In The Carrying Amount Of Other Intangible Assets (Details) € in Millions, $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Mar. 31, 2021EUR (€)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Finite-lived Intangible Assets [Roll Forward]
Beginning balance		$ 1,827			$ 1,827	$ 2,030	$ 2,030
Amortization	$ (62)			$ (59)	(183)	(175)	(234)
Foreign currency translation					(20)		31
Acquisitions					263
Ending balance	1,887				1,887		1,827
Investment Servicing
Finite-lived Intangible Assets [Roll Forward]
Beginning balance		1,733			1,733	1,908	1,908
Amortization					(165)		(206)
Foreign currency translation					(20)		31
Acquisitions					263
Ending balance	1,811				1,811		1,733
Investment Servicing | Fideuram Bank Luxembour
Finite-lived Intangible Assets [Roll Forward]
Payment for acquisition		258	€ 220
Investment Servicing | Mercatus, Inc
Finite-lived Intangible Assets [Roll Forward]
Payment for acquisition	88
Investment Management
Finite-lived Intangible Assets [Roll Forward]
Beginning balance		$ 94			94	$ 122	122
Amortization					(18)		(28)
Foreign currency translation					0		0
Acquisitions					0
Ending balance	$ 76				$ 76		$ 94

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Gross Carrying Amount, Accumulated Amortization And Net Carrying Amount Of Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,010	$ 3,894
Accumulated Amortization	(2,123)	(2,067)
Net Carrying Amount	1,887	1,827	$ 2,030
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,803	2,704
Accumulated Amortization	(1,464)	(1,450)
Net Carrying Amount	1,339	1,254
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	404	393
Accumulated Amortization	(133)	(113)
Net Carrying Amount	271	280
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	700	690
Accumulated Amortization	(444)	(425)
Net Carrying Amount	256	265
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	103	107
Accumulated Amortization	(82)	(79)
Net Carrying Amount	$ 21	$ 28

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Other Assets [Abstract]
Securities borrowed	$ 26,643	$ 18,330
Derivative instruments, net	7,565	5,804
Bank-owned life insurance	3,548	3,479
Investments in joint ventures and other unconsolidated entities	3,140	3,095
Collateral, net	1,348	2,616
Receivable for securities settlement	621	117
Right-of-use assets	612	720
Prepaid expenses	474	383
Accounts receivable	395	379
Income tax receivable	359	367
Deferred tax assets, net of valuation allowance	196	233
Deposits with clearing organizations	62	58
Other Assets	988	929
Total	45,951	36,510
Advances	$ 532	$ 460

Derivative Financial Instrume_3

Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Cash flow hedge gains to be reclassified within twelve months	$ 70
Maximum length of time hedged in cash flow hedge	5 years
Fair value of derivative liabilities	$ 15,938	$ 26,126
Interest rate swap | Fair Value Hedges
Derivative [Line Items]
Notional amount of derivative instruments	6,810	$ 2,600
Credit swap agreements
Derivative [Line Items]
Fair value of derivative liabilities	4,760
Cash collateral provided for derivative instruments	3,900
Maximum additional amount of payments related to termination events	$ 860

Derivative Financial Instrume_4

Derivative Financial Instruments - Schedule of Outstanding Hedges: (Notional Amount) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives not designated as hedging instruments | Interest rate contracts | Futures
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of derivative instruments	$ 3,572	$ 2,842
Derivatives not designated as hedging instruments | Foreign exchange contracts | Futures
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of derivative instruments	2,077	1,980
Derivatives not designated as hedging instruments | Foreign exchange contracts | Forward, swap and spot
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of derivative instruments	2,372,570	2,640,989
Derivatives not designated as hedging instruments | Foreign exchange contracts | Options purchased
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of derivative instruments	724	946
Derivatives not designated as hedging instruments | Foreign exchange contracts | Options written
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of derivative instruments	221	661
Derivatives not designated as hedging instruments | Other derivative contracts | Stable value contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of derivative instruments	32,704	32,359
Derivatives not designated as hedging instruments | Other derivative contracts | Deferred value awards
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of derivative instruments	360	332
Derivatives designated as hedging instruments | Interest rate contracts | Swap agreements
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of derivative instruments	13,714	7,449
Derivatives designated as hedging instruments | Foreign exchange contracts | Forward and swap
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of derivative instruments	$ 6,877	$ 5,221

Derivative Financial Instrume_5

Derivative Financial Instruments - Schedule of The Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	$ 16,457	$ 25,944
Fair value of derivative liabilities	15,938	26,126
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	16,453	25,943
Fair value of derivative liabilities	15,735	25,927
Interest rate contracts
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	4	1
Fair value of derivative liabilities	27	42
Derivatives not designated as hedging instruments | Other Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	16,345	25,939
Derivatives not designated as hedging instruments | Other Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	15,911	25,968
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	16,345	25,939
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	15,735	25,811
Derivatives not designated as hedging instruments | Other derivative contracts | Other Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	0	0
Derivatives not designated as hedging instruments | Other derivative contracts | Other Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	176	157
Derivatives designated as hedging instruments | Other Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	112	5
Derivatives designated as hedging instruments | Other Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	27	158
Derivatives designated as hedging instruments | Foreign exchange contracts | Other Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	108	4
Derivatives designated as hedging instruments | Foreign exchange contracts | Other Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	0	116
Derivatives designated as hedging instruments | Interest rate contracts | Other Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	4	1
Derivatives designated as hedging instruments | Interest rate contracts | Other Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	$ 27	$ 42

Derivative Financial Instrume_6

Derivative Financial Instruments - Impact of Derivatives on Consolidated Statement of Income (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	$ 167	$ 145	$ 513	$ 603
Foreign exchange contracts | Foreign exchange trading services
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	186	164	617	712
Foreign exchange contracts | Interest expense
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	16	20	53	39
Interest rate contracts | Foreign exchange trading services
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	0	0	1	3
Other derivative contracts | Compensation and employee benefits
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	$ (35)	$ (39)	$ (158)	$ (151)

Derivative Financial Instrume_7

Derivative Financial Instruments - Carrying Amount and Cumulative Basis Adjustments for Hedge Accounting (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Hedged Items Currently Designated | Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of Hedged Assets/Liabilities	$ 9,024	$ 10,519
Cumulative Hedge Accounting Basis Adjustments	(14)	3
Hedged Items Currently Designated | Investment securities available-for-sale
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of Hedged Assets/Liabilities	2,420	2,330
Cumulative Hedge Accounting Basis Adjustments	4	2
De-designated | Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative Hedge Accounting Basis Adjustments	554	688
De-designated | Investment securities available-for-sale
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative Hedge Accounting Basis Adjustments	$ 28	$ 43

Derivative Financial Instrume_8

Derivative Financial Instruments - Impact on Derivatives and Hedged Items on Consolidated Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	$ 8	$ (14)	$ (17)	$ 561
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income	(9)	11	14	(557)
Net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, net of related taxes	13	4	9	0
Investment securities available-for-sale | Net interest income | Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	15	5	9	(3)
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income	(17)	(6)	(12)	0
Long-term debt | Net interest income | Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	(7)	(19)	(26)	564
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income	$ 8	$ 17	$ 26	$ (557)

Derivative Financial Instrume_9

Derivative Financial Instruments - Schedule of Differences Between the Gains (Losses) on the Derivative and The Gains (Losses) on the Hedged Item (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Gain (loss) on derivative recognized in OCI, cash flow hedge	$ 9	$ (30)	$ 46	$ 168
Gain (loss) on derivative recognized in OCI, net investment hedge	111	(122)	222	(100)
Amount of Gain or (Loss) Recognized in Other Comprehensive Income on Derivative	120	(152)	268	68
Gain (loss) on hedges reclassified to income, cash flow hedge	24	24	70	52
Gain (loss) on hedges reclassified to income, net investment hedge	0	0	0	0
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	24	24	$ 70	52
Floating-rate loans
Derivative [Line Items]
Term of debt instrument			5 years
Interest rate contracts
Derivative [Line Items]
Gain (loss) on derivative recognized in OCI, cash flow hedge	(3)	0	$ (9)	179
Interest rate contracts | Net interest revenue
Derivative [Line Items]
Gain (loss) on hedges reclassified to income, cash flow hedge	22	18	62	32
Foreign exchange contracts
Derivative [Line Items]
Gain (loss) on derivative recognized in OCI, cash flow hedge	12	(30)	55	(11)
Gain (loss) on derivative recognized in OCI, net investment hedge	111	(122)	222	(100)
Foreign exchange contracts | Net interest revenue
Derivative [Line Items]
Gain (loss) on hedges reclassified to income, cash flow hedge	2	6	8	20
Foreign exchange contracts | Gains (Losses) related to investment securities, net
Derivative [Line Items]
Gain (loss) on hedges reclassified to income, net investment hedge	$ 0	$ 0	$ 0	$ 0

Offsetting Arrangements - Narra

Offsetting Arrangements - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting [Abstract]
Fair Value of securities received as collateral that can be resold or repledged	$ 1,970	$ 6,480
Fair Value of securities received as collateral that have been resold or repledged	$ 0	$ 3,880

Offsetting Arrangements - Asset

Offsetting Arrangements - Assets With Offsetting Arrangements (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Derivatives, Gross Amounts of Recognized Assets	$ 16,457	$ 25,944
Derivatives, Gross Amounts Offset in Statement of Condition	(8,892)	(20,140)
Derivatives, Net Amounts of Assets Presented in Statement of Condition	7,565	5,804
Derivatives, Net Amount	6,479	4,699
Derivatives, Cash collateral and securities netting, cash offset	(1,225)	(5,869)
Derivatives, Cash collateral and securities netting, Cash and Securities Received	(1,086)	(1,105)
Derivatives, Cash collateral and securities netting, Net Amount	(2,311)	(6,974)
Resale agreements and securities borrowing, Gross Amounts of Recognized Assets	87,099	174,461
Resale agreements and securities borrowing, Gross Amounts Offset in Statement of Condition	(57,609)	(153,025)
Resale agreements and securities borrowing, Net Amounts of Assets Presented in Statement of Condition	29,490	21,436
Resale agreements and securities borrowing, Cash and Securities Received	(29,242)	(20,568)
Resale agreements and securities borrowing, Net Amount	248	868
Total derivatives and other financial instruments, Gross Amounts of Recognized Assets	103,556	200,405
Total derivatives and other financial instruments, Gross Amounts Offset in Statement of Condition	(66,501)	(173,165)
Total derivatives and other financial instruments, Net Amounts of Assets Presented in Statement of Condition	37,055	27,240
Total derivatives and other financial instruments, Cash and Securities Received	(30,328)	(21,673)
Total derivatives and other financial instruments, Net Amount	6,727	5,567
Securities purchased under resale agreements	2,847	3,106
Cash collateral provided for securities borrowing	26,640	18,330
Foreign exchange contracts
Offsetting Assets [Line Items]
Derivatives, Gross Amounts of Recognized Assets	16,453	25,943
Derivatives, Gross Amounts Offset in Statement of Condition	(7,667)	(14,271)
Derivatives, Net Amounts of Assets Presented in Statement of Condition	8,786	11,672
Derivatives, Net Amount	8,786	11,672
Interest rate contracts
Offsetting Assets [Line Items]
Derivatives, Gross Amounts of Recognized Assets	4	1
Derivatives, Gross Amounts Offset in Statement of Condition	0	0
Derivatives, Net Amounts of Assets Presented in Statement of Condition	4	1
Derivatives, Net Amount	$ 4	$ 1

Offsetting Arrangements - Liabi

Offsetting Arrangements - Liabilities With Offsetting Arrangements (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	$ 15,938	$ 26,126
Derivatives, Gross amounts offset in statement of condition	(11,623)	(15,558)
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	4,315	10,568
Derivative, Net Amount	3,046	8,836
Derivative liability, collateral, cash offset	(3,956)	(1,287)
Derivatives, Cash and collateral securities netting, Cash and Securities Provided	(1,269)	(1,732)
Derivatives, Cash and collateral securities netting, Net	(5,225)	(3,019)
Resale agreements and securities lending, Gross Amounts of Recognized Liabilities	66,016	165,793
Resale agreements and securities lending, Gross Amounts Offset in Statement of Condition	(57,609)	(153,025)
Resale agreements and securities lending, Net Amounts of Liabilities Presented in Statement of Condition	8,407	12,768
Resale agreements and securities lending, Cash and Securities Provided	(7,802)	(12,448)
Resale agreements and securities lending, Net Amount	605	320
Total derivatives and other financial instruments, Gross Amounts of Recognized Liabilities	81,954	191,919
Total derivatives and other financial instruments, Gross Amounts Offset in Statement of Condition	(69,232)	(168,583)
Total derivatives and other financial instruments, Net Amounts of Liabilities Presented in Statement of Condition	12,722	23,336
Total derivatives and other financial instruments, Cash and Securities Provided	(9,071)	(14,180)
Total derivatives and other financial instruments, Net Amount	3,651	9,156
Securities sold under repurchase agreements	637	3,413
Foreign exchange contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	15,735	25,927
Derivatives, Gross amounts offset in statement of condition	(7,663)	(14,271)
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	8,072	11,656
Derivative, Net Amount	8,072	11,656
Interest rate contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	27	42
Derivatives, Gross amounts offset in statement of condition	(4)	0
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	23	42
Derivative, Net Amount	23	42
Other derivative contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	176	157
Derivatives, Gross amounts offset in statement of condition	0	0
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	176	157
Derivative, Net Amount	176	157
Accrued expenses and other liabilities
Offsetting Liabilities [Line Items]
Cash collateral received in connection to securities finance activities	$ 7,770	$ 9,360

Offsetting Arrangements - Repo,

Offsetting Arrangements - Repo, Sec Lending Transactions Maturity By Category (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 53,915	$ 152,140
Securities lending transactions	12,101	13,653
Gross amount of recognized liabilities for repurchase agreements and securities lending	66,016	165,793
U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	53,915	152,140
Securities lending transactions	2	0
Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	149	110
Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	11,949	8,790
Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	1	4,753
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	53,915	152,140
Securities lending transactions	10,028	12,441
Gross amount of recognized liabilities for repurchase agreements and securities lending	63,943	164,581
Overnight and Continuous | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	53,915	152,140
Securities lending transactions	2	0
Overnight and Continuous | Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	149	110
Overnight and Continuous | Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	9,876	7,578
Overnight and Continuous | Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	1	4,753
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Securities lending transactions	54	56
Gross amount of recognized liabilities for repurchase agreements and securities lending	54	56
Up to 30 Days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Securities lending transactions	0	0
Up to 30 Days | Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	0	0
Up to 30 Days | Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	54	56
Up to 30 Days | Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	0	0
30-90 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Securities lending transactions	3	0
Gross amount of recognized liabilities for repurchase agreements and securities lending	3	0
30-90 days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Securities lending transactions	0	0
30-90 days | Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	0	0
30-90 days | Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	3
30-90 days | Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	0	0
Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Securities lending transactions	2,016	1,156
Gross amount of recognized liabilities for repurchase agreements and securities lending	2,016	1,156
Greater than 90 Days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Securities lending transactions	0	0
Greater than 90 Days | Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	0	0
Greater than 90 Days | Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	2,016	1,156
Greater than 90 Days | Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	$ 0	$ 0

Commitments and Guarantees - Co

Commitments and Guarantees - Contractual Amounts of Credit-Related Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Unfunded credit facilities	$ 34,471	$ 34,213
Indemnified securities financing	402,369	440,875
Standby letters of credit	$ 3,333	$ 3,330
Unfunded commitments to extend credit, short term	73.00%	73.00%
Term of unfunded commitment	1 year	1 year

Commitments and Guarantees - Sc

Commitments and Guarantees - Schedule Of Repurchase Agreements (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Fair value of indemnified securities financing	$ 402,369	$ 440,875
Fair value of cash and securities held by us, as agent, as collateral for indemnified securities financing	422,882	463,273
Fair value of collateral for indemnified securities financing invested in indemnified repurchase agreements	67,833	54,432
Fair value of cash and securities held by us or our agents as collateral for investments in indemnified repurchase agreements	$ 73,176	$ 58,092

Commitments and Guarantees - Na

Commitments and Guarantees - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Cash collateral provided for securities lending	$ 26,640	$ 18,330
Accrued expenses and other liabilities
Loss Contingencies [Line Items]
Cash collateral received in connection to securities finance activities	$ 7,770	$ 9,360

Contingencies (Details)

Contingencies (Details) $ in Millions	1 Months Ended
	Aug. 31, 2021plaintiff	May 31, 2021USD ($)	Jun. 30, 2019USD ($)	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Loss Contingencies [Line Items]
Accrual of loss contingency				$ 19
Estimate of possible loss				45
Unrecognized tax benefits				295	$ 308
Invoicing Matter
Loss Contingencies [Line Items]
Payments for settlements			$ 48.8
Invoicing Matter | United States Attorney for the District of Massachusetts
Loss Contingencies [Line Items]
Amount awarded to other party		$ 115
Invoicing Matter | Massachusetts Attorney General
Loss Contingencies [Line Items]
Amount awarded to other party			5.5
Invoicing Matter | U.S. Securities and Exchange Commission
Loss Contingencies [Line Items]
Amount awarded to other party			$ 40
Edmar v Currenex
Loss Contingencies [Line Items]
Loss contingency, number of plaintiffs | plaintiff	2
Legal Reserve | Invoicing Matter
Loss Contingencies [Line Items]
Estimate of possible loss				$ 360

Variable Interest Entities (Det

Variable Interest Entities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Variable Interest Entity [Line Items]
Variable interest entity, other short-term borrowings	$ 430		$ 620
Weighted average life of trusts	2 years 2 months 12 days	2 years 8 months 12 days
Assets	$ 323,139		314,706
Liabilities	295,825		288,506
VIE - primary beneficiary
Variable Interest Entity [Line Items]
Assets	0		17
Liabilities	0		4
Potential maximum loss exposure of unconsolidated funds			13
VIE - not primary beneficiary
Variable Interest Entity [Line Items]
Potential maximum loss exposure of unconsolidated funds	11		22
State and political subdivisions, securities in trusts
Variable Interest Entity [Line Items]
Investment securities related to state and political subdivisions	$ 610		$ 700

Shareholders' Equity - Schedule

Shareholders' Equity - Schedule of Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions

Mar. 15, 2026

Mar. 15, 2024

Dec. 15, 2023

Sep. 30, 2021

Sep. 30, 2018

Apr. 30, 2016

May 31, 2015

Feb. 28, 2014

Sep. 14, 2021

Dec. 14, 2023

Sep. 14, 2020

Mar. 14, 2026

Mar. 14, 2024

Mar. 15, 2021

Dec. 31, 2020

Series D Preferred Stock, Depository Share

Class of Stock [Line Items]

Depositary shares issued (shares)

30,000,000

Amount outstanding (in shares)

750,000,000

Liquidation preference per share (USD per share)

$ 25

Series D Preferred Stock

Class of Stock [Line Items]

Ownership Interest Per Depositary Share

0.025%

Liquidation preference per share (USD per share)

$ 100,000

Preferred stock

$ 742

$ 742

Series D Preferred Stock | Forecast

Class of Stock [Line Items]

Per annum dividend rate

5.90%

Series F Preferred Stock, Depository Share

Class of Stock [Line Items]

Depositary shares issued (shares)

250,000

Amount outstanding (in shares)

250,000,000

Liquidation preference per share (USD per share)

$ 1,000

$ 1,000

Series F Preferred Stock

Class of Stock [Line Items]

Ownership Interest Per Depositary Share

1.00%

Liquidation preference per share (USD per share)

$ 100,000

$ 100,000

Per annum dividend rate

5.25%

Preferred stock

247

742

Series G Preferred Stock, Depository Share

Class of Stock [Line Items]

Depositary shares issued (shares)

20,000,000

Amount outstanding (in shares)

500,000,000

Liquidation preference per share (USD per share)

$ 25

Series G Preferred Stock

Class of Stock [Line Items]

Ownership Interest Per Depositary Share

0.025%

Liquidation preference per share (USD per share)

$ 100,000

Preferred stock

493

493

Series G Preferred Stock | Forecast

Class of Stock [Line Items]

Per annum dividend rate

5.35%

Series H Preferred Stock, Depository Share

Class of Stock [Line Items]

Depositary shares issued (shares)

500,000

Amount outstanding (in shares)

500,000,000

Liquidation preference per share (USD per share)

$ 1,000

Series H Preferred Stock

Class of Stock [Line Items]

Ownership Interest Per Depositary Share

1.00%

Liquidation preference per share (USD per share)

$ 100,000

Preferred stock

$ 494

$ 494

Series H Preferred Stock | Forecast

Class of Stock [Line Items]

Per annum dividend rate

5.625%

London Interbank Offered Rate (LIBOR) | Series D Preferred Stock | Forecast

Class of Stock [Line Items]

Per annum dividend rate, basis spread on variable rate

3.108%

London Interbank Offered Rate (LIBOR) | Series F Preferred Stock

Class of Stock [Line Items]

Per annum dividend rate, basis spread on variable rate

3.713%

3.597%

London Interbank Offered Rate (LIBOR) | Series G Preferred Stock | Forecast

Class of Stock [Line Items]

Per annum dividend rate, basis spread on variable rate

3.709%

London Interbank Offered Rate (LIBOR) | Series H Preferred Stock | Forecast

Class of Stock [Line Items]

Per annum dividend rate, basis spread on variable rate

2.539%

Shareholders' Equity - Preferre

Shareholders' Equity - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended						9 Months Ended
	Oct. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 15, 2021	Dec. 31, 2020	Sep. 30, 2018	Apr. 30, 2016	May 31, 2015	Feb. 28, 2014
Class of Stock [Line Items]
Preferred stock cash dividend		$ 20	$ 34	$ 25	$ 38	$ 32	$ 44	$ 79	$ 114
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)		7,500						7,500			7,500
Liquidation preference per share (USD per share)															$ 100,000
Preferred dividends declared (USD per share)		$ 1,475			$ 1,475			$ 4,425	$ 4,425
Preferred stock cash dividend		$ 11			$ 11			$ 33	$ 33
Series D Preferred Stock | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,475
Preferred stock cash dividend	$ 11
Series D Preferred Stock, Depository Share
Class of Stock [Line Items]
Liquidation preference per share (USD per share)															$ 25
Preferred dividends declared (USD per share)		$ 0.37			$ 0.37			$ 1.11	$ 1.11
Series D Preferred Stock, Depository Share | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 0.37
Series F Preferred Stock
Class of Stock [Line Items]
Redemption price										$ 500
Preferred shares to be redeemed (in shares)										5,000
Preferred stock, shares outstanding (in shares)		2,500						2,500		7,500	2,500
Liquidation preference per share (USD per share)										$ 100,000				$ 100,000
Preferred dividends declared (USD per share)		$ 950			$ 2,625			$ 2,869	$ 5,250
Preferred stock cash dividend		$ 2			$ 20			$ 11	$ 40
Series F Preferred Stock | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 939
Preferred stock cash dividend	$ 2
Series F Preferred Stock, Depository Share
Class of Stock [Line Items]
Liquidation preference per share (USD per share)										$ 1,000				$ 1,000
Preferred dividends declared (USD per share)		$ 9.50			$ 26.25			$ 28.69	$ 52.50
Series F Preferred Stock, Depository Share | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 9.39
Series G Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)		5,000						5,000			5,000
Liquidation preference per share (USD per share)													$ 100,000
Preferred dividends declared (USD per share)		$ 1,338			$ 1,338			$ 4,014	$ 4,014,000,000
Preferred stock cash dividend		$ 7			$ 7			$ 21	$ 21
Series G Preferred Stock | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,338
Preferred stock cash dividend	$ 7
Series G Preferred Stock, Depository Share
Class of Stock [Line Items]
Liquidation preference per share (USD per share)													$ 25
Preferred dividends declared (USD per share)		$ 0.33			$ 0.33			$ 0.99	$ 0.99
Series G Preferred Stock, Depository Share | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 0.33
Series H Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)		5,000						5,000			5,000
Liquidation preference per share (USD per share)												$ 100,000
Preferred dividends declared (USD per share)		$ 0			$ 0			$ 2,813	$ 2,813
Preferred stock cash dividend		$ 0			$ 0			$ 14	$ 14
Series H Preferred Stock | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 2,813
Preferred stock cash dividend	$ 14
Series H Preferred Stock, Depository Share
Class of Stock [Line Items]
Liquidation preference per share (USD per share)												$ 1,000
Preferred dividends declared (USD per share)		$ 0			$ 0			$ 28.13	$ 28.13
Series H Preferred Stock, Depository Share | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 28.13

Shareholders' Equity - Schedu_2

Shareholders' Equity - Schedule of Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Dividends Payable [Line Items]
Preferred stock cash dividend	$ 20	$ 34	$ 25	$ 38	$ 32	$ 44	$ 79	$ 114
Series C Preferred Stock
Dividends Payable [Line Items]
Preferred dividends declared (USD per share)							$ 0	$ 1,313
Preferred stock cash dividend							$ 0	$ 6
Series C Preferred Stock, Depository Share
Dividends Payable [Line Items]
Preferred dividends declared (USD per share)							$ 0	$ 0.33
Series D Preferred Stock
Dividends Payable [Line Items]
Preferred dividends declared (USD per share)	$ 1,475			$ 1,475			$ 4,425	$ 4,425
Preferred stock cash dividend	$ 11			$ 11			$ 33	$ 33
Series D Preferred Stock, Depository Share
Dividends Payable [Line Items]
Preferred dividends declared (USD per share)	$ 0.37			$ 0.37			$ 1.11	$ 1.11
Series F Preferred Stock
Dividends Payable [Line Items]
Preferred dividends declared (USD per share)	$ 950			$ 2,625			$ 2,869	$ 5,250
Preferred stock cash dividend	$ 2			$ 20			$ 11	$ 40
Series F Preferred Stock, Depository Share
Dividends Payable [Line Items]
Preferred dividends declared (USD per share)	$ 9.50			$ 26.25			$ 28.69	$ 52.50
Series G Preferred Stock
Dividends Payable [Line Items]
Preferred dividends declared (USD per share)	$ 1,338			$ 1,338			$ 4,014	$ 4,014,000,000
Preferred stock cash dividend	$ 7			$ 7			$ 21	$ 21
Series G Preferred Stock, Depository Share
Dividends Payable [Line Items]
Preferred dividends declared (USD per share)	$ 0.33			$ 0.33			$ 0.99	$ 0.99
Series H Preferred Stock
Dividends Payable [Line Items]
Preferred dividends declared (USD per share)	$ 0			$ 0			$ 2,813	$ 2,813
Preferred stock cash dividend	$ 0			$ 0			$ 14	$ 14
Series H Preferred Stock, Depository Share
Dividends Payable [Line Items]
Preferred dividends declared (USD per share)	$ 0			$ 0			$ 28.13	$ 28.13

Shareholders' Equity - Common S

Shareholders' Equity - Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended							9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2021	Sep. 30, 2020	Jul. 31, 2021	Apr. 30, 2021	Jan. 31, 2021	Jun. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Proceeds from issuance of common stock, net of issuance costs	$ 1,900,000,000								$ 1,900,000,000	$ 0
Amount of common stock authorized for repurchase											$ 3,000,000,000	$ 425,000,000	$ 475,000,000	$ 2,000,000,000
Common Stock
Equity, Class of Treasury Stock [Line Items]
Public offering, new shares (in shares)	21.7
Offering price (in dollars per share)	$ 87.60	$ 87.60							$ 87.60
2019 Program
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased		$ 0	$ 0	$ 0	$ 0	$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 900,000,000	$ 500,000,000

Shareholders' Equity - Schedu_3

Shareholders' Equity - Schedule of Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended									9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2021	Sep. 30, 2020
Equity, Class of Treasury Stock [Line Items]
Cash dividends declared (in USD per share)	$ 0.57	$ 0.52	$ 0.52		$ 0.52	$ 0.52	$ 0.52			$ 1.61	$ 1.56
Total (In millions)	$ 209	$ 179	$ 182		$ 184	$ 183	$ 183			$ 570	$ 550
2019 Program
Equity, Class of Treasury Stock [Line Items]
Shares Acquired (in shares)	0				0					11.2	6.5
Average Cost per Share (USD per share)	$ 0				$ 0					$ 80	$ 77.35
Total Acquired	$ 0			$ 0	$ 0	$ 0	$ 500	$ 500	$ 500	$ 900	$ 500

Shareholders' Equity - Schedu_4

Shareholders' Equity - Schedule of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Equity [Abstract]
Net unrealized gains (losses) on cash flow hedges	$ 41		$ 82
Net unrealized gains (losses) on available-for-sale securities portfolio	353		976
Net unrealized gains (losses) related to reclassified available-for-sale securities	(39)		(68)
Net unrealized gains (losses) on available-for-sale securities	314		908
Net unrealized (losses) on available-for-sale securities designated in fair value hedges	(24)		(36)
Net unrealized gains (losses) on hedges of net investments in non-U.S. subsidiaries	18		(54)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit	(2)		(2)
Net unrealized (losses) on retirement plans	(166)		(172)
Foreign currency translation	(863)		(837)
Total	$ (682)	$ 187	$ (111)

Shareholders' Equity - Accumula

Shareholders' Equity - Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 25,167	$ 25,005	$ 26,200	$ 24,873	$ 23,861	$ 24,431	$ 26,200	$ 24,431
Other comprehensive income (loss) before reclassifications							(830)	786
Amounts reclassified into (out of) accumulated other comprehensive loss							(39)	(21)
Other comprehensive income (loss)	(260)	(4)	(605)	319	490	(44)	(869)	765
Ending balance	27,314	25,167	25,005	25,558	24,873	23,861	27,314	25,558
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(422)	(418)	187	(430)	(920)	(876)	187	(876)
Other comprehensive income (loss)	(260)	(4)	(605)	319	490	(44)
Ending balance	(682)	$ (422)	(418)	(111)	$ (430)	(920)	(682)	(111)
Net Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			57			(70)	57	(70)
Other comprehensive income (loss) before reclassifications							35	189
Amounts reclassified into (out of) accumulated other comprehensive loss							(51)	(37)
Other comprehensive income (loss)							(16)	152
Ending balance	41			82			41	82
Net Unrealized Gains (Losses) on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			848			409	848	409
Other comprehensive income (loss) before reclassifications							(558)	462
Amounts reclassified into (out of) accumulated other comprehensive loss							0	1
Other comprehensive income (loss)							(558)	463
Ending balance	290			872			290	872
Net Unrealized Losses on Hedges of Net Investments in Non-U.S. Subsidiaries
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(204)			46	(204)	46
Other comprehensive income (loss) before reclassifications							222	(100)
Amounts reclassified into (out of) accumulated other comprehensive loss							0	0
Other comprehensive income (loss)							222	(100)
Ending balance	18			(54)			18	(54)
Other-Than-Temporary Impairment on Held-to-Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(2)			(2)	(2)	(2)
Other comprehensive income (loss) before reclassifications							0	0
Amounts reclassified into (out of) accumulated other comprehensive loss							0	0
Other comprehensive income (loss)							0	0
Ending balance	(2)			(2)			(2)	(2)
Net Unrealized Losses on Retirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(178)			(187)	(178)	(187)
Other comprehensive income (loss) before reclassifications							0	0
Amounts reclassified into (out of) accumulated other comprehensive loss							12	15
Other comprehensive income (loss)							12	15
Ending balance	(166)			(172)			(166)	(172)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ (334)			$ (1,072)	(334)	(1,072)
Other comprehensive income (loss) before reclassifications							(529)	235
Amounts reclassified into (out of) accumulated other comprehensive loss							0	0
Other comprehensive income (loss)							(529)	235
Ending balance	$ (863)			$ (837)			$ (863)	$ (837)

Shareholders' Equity - Adjustme

Shareholders' Equity - Adjustments to Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Class of Stock [Line Items]
Gains (losses) from sales of available-for-sale securities, net	$ (1)			$ 0			$ (1)	$ 2
Net interest income	(487)			(478)			(1,421)	(1,701)
Compensation and employee benefits expenses	1,054			1,062			3,373	3,321
Net income	(714)	$ (763)	$ (519)	(555)	$ (694)	$ (634)	(1,996)	(1,883)
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, tax	6			7			19	14
Net realized gains from sales of available-for-sale securities, tax							0	1
Other comprehensive (income) loss, actuarial losses, tax	1			1			5	5
Reclassification out of Accumulated Other Comprehensive Income
Class of Stock [Line Items]
Net income	(16)			(16)			(39)	(21)
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gains (Losses) on Available-for-Sale Securities
Class of Stock [Line Items]
Gains (losses) from sales of available-for-sale securities, net							0	1
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gains (Losses) on Cash Flow Hedges
Class of Stock [Line Items]
Net interest income	(18)			(17)			(51)	(37)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Actuarial Losses
Class of Stock [Line Items]
Compensation and employee benefits expenses	$ 2			$ 1			$ 12	$ 15

Regulatory Capital (Details)

Regulatory Capital (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	$ 24,785	$ 23,442
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
Capital conservation buffer	0.025
Stress capital buffer	2.50%
Global systemically important bank	0.010
Countercyclical capital buffer	0
Leverage ratio minimum	0.050
Basel III Advanced Approaches
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common stock and related surplus	$ 11,267	$ 10,709
Retained earnings	24,785	23,442
Accumulated other comprehensive income (loss)		187
Treasury stock, at cost	(10,032)	(10,609)
Total	25,338	23,729
Goodwill and other intangible assets, net of associated deferred tax liabilities	(9,040)	(9,019)
Other adjustments	(467)	(333)
Common equity tier 1 capital	15,831	14,377
Preferred stock	1,976	2,471
Tier 1 capital	17,807	16,848
Qualifying subordinated long-term debt	1,590	961
Allowance for credit losses	0	1
Total capital	19,397	17,810
Credit risk	66,503	63,367
Operational risk	45,750	44,150
Market risk	2,625	2,188
Total risk-weighted assets	114,878	109,705
Adjusted quarterly average assets	$ 281,952	$ 263,490
Common equity tier 1 capital	13.80%	13.10%
Tier 1 capital	0.155	0.154
Total capital	0.169	0.162
Tier 1 leverage capital ratio, actual	0.063	0.064
Basel III Standardized Approach
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common stock and related surplus	$ 11,267	$ 10,709
Retained earnings	24,785	23,442
Accumulated other comprehensive income (loss)	(682)	187
Treasury stock, at cost	(10,032)	(10,609)
Total	25,338	23,729
Goodwill and other intangible assets, net of associated deferred tax liabilities	(9,040)	(9,019)
Other adjustments	(467)	(333)
Common equity tier 1 capital	15,831	14,377
Preferred stock	1,976	2,471
Tier 1 capital	17,807	16,848
Qualifying subordinated long-term debt	1,590	961
Allowance for credit losses	117	148
Total capital	19,514	17,957
Credit risk	114,604	114,892
Market risk	2,625	2,188
Total risk-weighted assets	117,229	117,080
Adjusted quarterly average assets	$ 281,952	$ 263,490
Common equity tier 1 capital	13.50%	12.30%
Tier 1 capital	0.152	0.144
Total capital	0.166	0.153
Tier 1 leverage capital ratio, actual	0.063	0.064
State Street Bank | Basel III Advanced Approaches
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common stock and related surplus	$ 12,887	$ 12,893
Retained earnings	14,919	12,939
Accumulated other comprehensive income (loss)	(465)	371
Treasury stock, at cost	0	0
Total	27,341	26,203
Goodwill and other intangible assets, net of associated deferred tax liabilities	(8,770)	(8,745)
Other adjustments	(281)	(152)
Common equity tier 1 capital	18,290	17,306
Preferred stock	0	0
Tier 1 capital	18,290	17,306
Qualifying subordinated long-term debt	754	966
Allowance for credit losses	0	10
Total capital	19,044	18,282
Credit risk	59,635	58,960
Operational risk	43,113	43,663
Market risk	2,625	2,188
Total risk-weighted assets	105,373	104,811
Adjusted quarterly average assets	$ 278,705	$ 260,489
Common equity tier 1 capital	17.40%	16.50%
Tier 1 capital	0.174	0.165
Total capital	0.181	0.174
Tier 1 leverage capital ratio, actual	0.066	0.066
State Street Bank | Basel III Standardized Approach
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common stock and related surplus	$ 12,887	$ 12,893
Retained earnings	14,919	12,939
Accumulated other comprehensive income (loss)	(465)	371
Treasury stock, at cost	0	0
Total	27,341	26,203
Goodwill and other intangible assets, net of associated deferred tax liabilities	(8,770)	(8,745)
Other adjustments	(281)	(152)
Common equity tier 1 capital	18,290	17,306
Preferred stock	0	0
Tier 1 capital	18,290	17,306
Qualifying subordinated long-term debt	754	966
Allowance for credit losses	117	148
Total capital	19,161	18,420
Credit risk	111,464	110,797
Market risk	2,625	2,188
Total risk-weighted assets	114,089	112,985
Adjusted quarterly average assets	$ 278,705	$ 260,489
Common equity tier 1 capital	16.00%	15.30%
Tier 1 capital	0.160	0.153
Total capital	0.168	0.163
Tier 1 leverage capital ratio, actual	0.066	0.066

Net Interest Income - Component

Net Interest Income - Components of Interest Revenue and Interest Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income:
Interest-bearing deposits with banks	$ 0	$ (6)	$ (13)	$ 79
Investment securities:
Investment securities available-for-sale	150	169	435	609
Investment securities held-to-maturity	158	171	501	631
Investment securities purchased under money market liquidity facility	0	25	4	103
Total investment securities	308	365	940	1,343
Securities purchased under resale agreements	6	20	19	109
Loans	168	138	466	479
Other interest-earning assets	5	3	13	52
Total interest income	487	520	1,425	2,062
Interest expense:
Interest-bearing deposits	(62)	(61)	(196)	(47)
Short-term borrowings under money market liquidity facility	0	23	4	87
Securities sold under repurchase agreements	0	0	0	3
Other short-term borrowings	0	2	1	17
Long-term debt	51	69	165	252
Other interest-bearing liabilities	11	9	30	49
Total interest expense	0	42	4	361
Net interest income	$ 487	$ 478	$ 1,421	$ 1,701

Expenses - Schedule of Expenses

Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Expenses [Abstract]
Professional services	$ 91	$ 89	$ 246	$ 261
Regulatory fees and assessments	16	16	53	45
Sales advertising public relations	13	20	46	50
Securities processing	8	10	22	40
Insurance	3	2	9	10
Bank operations	3	2	7	15
Other	87	90	259	281
Total other expenses	$ 221	$ 229	$ 642	$ 702

Expenses - Narrative (Details)

Expenses - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Charles River Development
Restructuring Cost and Reserve [Line Items]
Acquisitions costs	$ 11	$ 15	$ 33	$ 38
BBH Investor Services
Restructuring Cost and Reserve [Line Items]
Acquisitions costs	$ 7

Expenses - Restructuring Reserv

Expenses - Restructuring Reserve (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Restructuring Reserve [Roll Forward]
Beginning balance	$ 152	$ 186	$ 196	$ 138	$ 164	$ 198
Accruals			2
Payments and Other Adjustments	(23)	(34)	(11)	(10)	(26)	(34)
Ending balance	129	152	186	128	138	164
State Street Beacon
Restructuring Reserve [Roll Forward]
Accruals			(1)
Employee Related Costs
Restructuring Reserve [Roll Forward]
Beginning balance	146	180	190	132	157	190
Accruals			0
Payments and Other Adjustments	(23)	(34)	(9)	(10)	(25)	(33)
Ending balance	123	146	180	122	132	157
Employee Related Costs | State Street Beacon
Restructuring Reserve [Roll Forward]
Accruals			(1)
Real Estate Actions
Restructuring Reserve [Roll Forward]
Beginning balance	6	6	6	5	6	7
Accruals			2
Payments and Other Adjustments	0	0	(2)	1	(1)	(1)
Ending balance	6	6	6	6	5	6
Real Estate Actions | State Street Beacon
Restructuring Reserve [Roll Forward]
Accruals			0
Asset and Other Write-offs
Restructuring Reserve [Roll Forward]
Beginning balance	0	0	0	1	1	1
Accruals			0
Payments and Other Adjustments	0	0	0	(1)	0	0
Ending balance	$ 0	$ 0	0	$ 0	$ 1	$ 1
Asset and Other Write-offs | State Street Beacon
Restructuring Reserve [Roll Forward]
Accruals			$ 0

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 714	$ 763	$ 519	$ 555	$ 694	$ 634	$ 1,996	$ 1,883
Preferred stock dividends	(21)			(38)			(85)	(123)
Dividends and undistributed earnings allocated to participating securities	0			0			(1)	(1)
Net income available to common shareholders	693			517			1,910	1,759
Net income available to common shareholders	$ 693			$ 517			$ 1,910	$ 1,759
Basic average common shares (in shares)	347,718			352,586			348,106	352,829
Effect of dilutive securities: common stock options and common stock awards (in shares)	5,776			4,582			5,270	4,142
Diluted average common shares (in shares)	353,494			357,168			353,376	356,971
Anti-dilutive securities (in shares)	97			1,309			119	1,351
Earnings per common share:
Basic (in USD per share)	$ 1.99			$ 1.47			$ 5.49	$ 4.99
Diluted (in USD per share)	$ 1.96			$ 1.45			$ 5.40	$ 4.93

Line of Business Information -

Line of Business Information - Narrative (Details) - 9 months ended Sep. 30, 2021	segment	line_of_business
Segment Reporting [Abstract]
Number of lines of business	2	2

Line of Business Information _2

Line of Business Information - Summary of Line of Business (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Servicing fees	$ 1,395	$ 1,301	$ 4,165	$ 3,860
Management fees	526	479	1,523	1,387
Foreign exchange trading services	279	270	911	1,039
Securities finance	106	84	314	268
Software and processing fees	198	172	588	529
Total fee revenue	2,504	2,306	7,501	7,083
Net interest income	487	478	1,421	1,701
Total other income (loss)	(1)	0	52	2
Total revenue	2,990	2,784	8,974	8,786
Provision for credit losses	(2)	0	(26)	88
Total expenses	2,116	2,103	6,559	6,440
Income before income tax expense	$ 876	$ 681	$ 2,441	$ 2,258
Pre-tax margin	29.00%	24.00%	27.00%	26.00%
Operating Segments | Investment Servicing
Segment Reporting Information [Line Items]
Servicing fees	$ 1,395	$ 1,301	$ 4,165	$ 3,860
Management fees	0	0	0	0
Foreign exchange trading services	266	252	869	998
Securities finance	103	81	304	258
Software and processing fees	204	162	585	528
Total fee revenue	1,968	1,796	5,923	5,644
Net interest income	491	482	1,432	1,716
Total other income (loss)	(1)	0	(1)	2
Total revenue	2,458	2,278	7,354	7,362
Provision for credit losses	(2)	0	(26)	88
Total expenses	1,755	1,739	5,389	5,315
Income before income tax expense	$ 705	$ 539	$ 1,991	$ 1,959
Pre-tax margin	29.00%	24.00%	27.00%	27.00%
Operating Segments | Investment Management
Segment Reporting Information [Line Items]
Servicing fees	$ 0	$ 0	$ 0	$ 0
Management fees	526	479	1,523	1,387
Foreign exchange trading services	13	18	42	41
Securities finance	3	3	10	10
Software and processing fees	(6)	10	3	1
Total fee revenue	536	510	1,578	1,439
Net interest income	(4)	(4)	(11)	(15)
Total other income (loss)	0	0	0	0
Total revenue	532	506	1,567	1,424
Provision for credit losses	0	0	0	0
Total expenses	339	358	1,082	1,096
Income before income tax expense	$ 193	$ 148	$ 485	$ 328
Pre-tax margin	36.00%	29.00%	31.00%	23.00%
Other
Segment Reporting Information [Line Items]
Servicing fees	$ 0	$ 0	$ 0	$ 0
Management fees	0	0	0	0
Foreign exchange trading services	0	0	0	0
Securities finance	0	0	0	0
Software and processing fees	0	0	0	0
Total fee revenue	0	0	0	0
Net interest income	0	0	0	0
Total other income (loss)	0	0	53	0
Total revenue	0	0	53	0
Provision for credit losses	0	0	0	0
Total expenses	22	6	88	29
Income before income tax expense	$ (22)	$ (6)	$ (35)	$ (29)

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)segment	Sep. 30, 2021USD ($)line_of_business	Dec. 31, 2020USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of lines of business	2	2
Accrued Interest and Fees Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables related to contracts with customers	$ 2,870	$ 2,870	$ 2,680

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Servicing fees	$ 1,395	$ 1,301	$ 4,165	$ 3,860
Management fees	526	479	1,523	1,387
Foreign exchange trading services	279	270	911	1,039
Securities finance	106	84	314	268
Software and processing fees	198	172	588	529
Total fee revenue	2,504	2,306	7,501	7,083
Net interest income	487	478	1,421	1,701
Total other income (loss)	(1)	0	52	2
Total revenue	2,990	2,784	8,974	8,786
Operating Segments | Investment Servicing
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,663	1,541	4,996	4,673
All other revenue	795	737	2,358	2,689
Servicing fees	1,395	1,301	4,165	3,860
Management fees	0	0	0	0
Foreign exchange trading services	266	252	869	998
Securities finance	103	81	304	258
Software and processing fees	204	162	585	528
Total fee revenue	1,968	1,796	5,923	5,644
Net interest income	491	482	1,432	1,716
Total other income (loss)	(1)	0	(1)	2
Total revenue	2,458	2,278	7,354	7,362
Operating Segments | Investment Servicing | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,395	1,301	4,165	3,860
All other revenue	0	0	0	0
Servicing fees	1,395	1,301	4,165	3,860
Operating Segments | Investment Servicing | Management fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	0	0	0
Management fees	0	0	0	0
Operating Segments | Investment Servicing | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	82	90	260	285
All other revenue	184	162	609	713
Foreign exchange trading services	266	252	869	998
Operating Segments | Investment Servicing | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	60	42	181	162
All other revenue	43	39	123	96
Securities finance	103	81	304	258
Operating Segments | Investment Servicing | Processing fees and other
Disaggregation of Revenue [Line Items]
Topic 606 revenue	126	108	390	366
All other revenue	78	54	195	162
Software and processing fees	204	162	585	528
Operating Segments | Investment Servicing | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,663	1,541	4,996	4,673
All other revenue	305	255	927	971
Total fee revenue	1,968	1,796	5,923	5,644
Operating Segments | Investment Servicing | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	491	482	1,432	1,716
Net interest income	491	482	1,432	1,716
Operating Segments | Investment Servicing | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0		0	0
All other revenue	(1)		(1)	2
Total other income (loss)	(1)		(1)	2
Operating Segments | Investment Management
Disaggregation of Revenue [Line Items]
Topic 606 revenue	539	497	1,565	1,428
All other revenue	(7)	9	2	(4)
Servicing fees	0	0	0	0
Management fees	526	479	1,523	1,387
Foreign exchange trading services	13	18	42	41
Securities finance	3	3	10	10
Software and processing fees	(6)	10	3	1
Total fee revenue	536	510	1,578	1,439
Net interest income	(4)	(4)	(11)	(15)
Total other income (loss)	0	0	0	0
Total revenue	532	506	1,567	1,424
Operating Segments | Investment Management | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	0	0	0
Servicing fees	0	0	0	0
Operating Segments | Investment Management | Management fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	526	479	1,523	1,387
All other revenue	0	0	0	0
Management fees	526	479	1,523	1,387
Operating Segments | Investment Management | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	13	18	42	41
All other revenue	0	0	0	0
Foreign exchange trading services	13	18	42	41
Operating Segments | Investment Management | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	3	3	10	10
Securities finance	3	3	10	10
Operating Segments | Investment Management | Processing fees and other
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	(6)	10	3	1
Software and processing fees	(6)	10	3	1
Operating Segments | Investment Management | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	539	497	1,565	1,428
All other revenue	(3)	13	13	11
Total fee revenue	536	510	1,578	1,439
Operating Segments | Investment Management | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	(4)	(4)	(11)	(15)
Net interest income	(4)	(4)	(11)	(15)
Operating Segments | Investment Management | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0		0	0
All other revenue	0		0	0
Total other income (loss)	0		0	0
Other
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0		0
All other revenue	0		53
Servicing fees	0	0	0	0
Management fees	0	0	0	0
Foreign exchange trading services	0	0	0	0
Securities finance	0	0	0	0
Software and processing fees	0	0	0	0
Total fee revenue	0	0	0	0
Net interest income	0	0	0	0
Total other income (loss)	0	0	53	0
Total revenue	0	$ 0	53	$ 0
Other | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0		0
All other revenue	0		0
Servicing fees	0		0
Other | Management fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0		0
All other revenue	0		0
Management fees	0		0
Other | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0		0
All other revenue	0		0
Foreign exchange trading services	0		0
Other | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0		0
All other revenue	0		0
Securities finance	0		0
Other | Processing fees and other
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0		0
All other revenue	0		0
Software and processing fees	0		0
Other | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0		0
All other revenue	0		0
Total fee revenue	0		0
Other | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0		0
All other revenue	0		0
Net interest income	0		0
Other | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0		0
All other revenue	0		53
Total other income (loss)	$ 0		$ 53

Non-U.S. Activities - Schedule

Non-U.S. Activities - Schedule Of Results From Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 2,990	$ 2,784	$ 8,974	$ 8,786
Income before income tax expense	876	681	2,441	2,258
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,331	1,268	3,987	3,894
Income before income tax expense	387	325	1,095	1,002
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,659	1,516	4,987	4,892
Income before income tax expense	$ 489	$ 356	$ 1,346	$ 1,256

Non-U.S. Activities - Narrative

Non-U.S. Activities - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total assets	$ 323,139	$ 314,706
Non-U.S.
Segment Reporting Information [Line Items]
Total assets	$ 96,280	$ 92,330