HSBC USA (HUSI+G) 10-Q 29 Oct 24 2024 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2024	Oct. 25, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-07436
Entity Registrant Name	HSBC USA Inc.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	13-2764867
Entity Address, Address Line One	66 Hudson Boulevard
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10001
City Area Code	212
Local Phone Number	525-5000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		714
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000083246
Current Fiscal Year End Date	--12-31
$100,000,000 Zero Coupon Callable Accreting Notes due January 15, 2043
Document Information [Line Items]
Title of 12(b) Security	$100,000,000 Zero Coupon Callable Accreting Notes due January 15, 2043
Trading Symbol	HUSI/43
Security Exchange Name	NYSE
$50,000,000 Zero Coupon Callable Accreting Notes due January 29, 2043
Document Information [Line Items]
Title of 12(b) Security	$50,000,000 Zero Coupon Callable Accreting Notes due January 29, 2043
Trading Symbol	HUSI/43A
Security Exchange Name	NYSE

CONSOLIDATED STATEMENT OF INCOM

CONSOLIDATED STATEMENT OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest income:
Loans	$ 950	$ 887	$ 2,782	$ 2,551
Securities	481	414	1,388	1,105
Trading securities	94	72	268	181
Short-term investments	403	398	1,261	1,224
Other	18	21	57	58
Total interest income	1,946	1,792	5,756	5,119
Interest expense:
Deposits	1,046	971	3,095	2,596
Short-term borrowings	162	139	472	359
Long-term debt	282	297	865	843
Other	17	13	47	32
Total interest expense	1,507	1,420	4,479	3,830
Net interest income	439	372	1,277	1,289
Provision for credit losses	(13)	(8)	36	48
Net interest income after provision for credit losses	452	380	1,241	1,241
Other revenues:
Trading revenue	208	277	717	730
Other securities gains (losses), net	(148)	0	(138)	3
Gain (loss) on instruments designated at fair value and related derivatives	(3)	(9)	(33)	(29)
Other income (loss)	(30)	(54)	(68)	(131)
Total other revenues	334	517	1,410	1,418
Operating expenses:
Salaries and employee benefits	145	134	423	393
Support services from HSBC affiliates	428	426	1,246	1,235
Occupancy expense, net	12	19	53	59
Other expenses	86	79	318	247
Total operating expenses	671	658	2,040	1,934
Income before income tax	115	239	611	725
Income tax expense	27	57	129	175
Net income	88	182	482	550
Credit card fees, net
Other revenues:
Other revenues	14	13	42	36
Trust and investment management fees
Other revenues:
Other revenues	37	33	107	96
Other fees and commissions
Other revenues:
Other revenues	157	170	503	475
Servicing and other fees from HSBC affiliates
Other revenues:
Other revenues	$ 99	$ 87	$ 280	$ 238

CONSOLIDATED STATEMENT OF COMPR

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 88	$ 182	$ 482	$ 550
Net change in unrealized gains (losses), net of tax:
Investment securities	550	(346)	360	(205)
Fair value option liabilities attributable to our own credit spread	4	(8)	(37)	(9)
Derivatives designated as cash flow hedges	(107)	60	(43)	109
Pension and post-retirement benefit plans	(1)	(1)	(1)	(1)
Total other comprehensive income (loss)	446	(295)	279	(106)
Comprehensive income (loss)	$ 534	$ (113)	$ 761	$ 444

CONSOLIDATED BALANCE SHEET (UNA

CONSOLIDATED BALANCE SHEET (UNAUDITED) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Assets:
Cash and due from banks	[1]	$ 725	$ 704
Interest bearing deposits with banks	[1]	28,334	25,015
Federal funds sold and securities purchased under agreements to resell	[1]	4,310	13,878
Trading assets (includes $3.4 billion and $3.0 billion pledged to creditors at September 30, 2024 and December 31, 2023, respectively)	[1]	21,707	22,115
Securities available-for-sale (includes amortized cost of $27.7 billion and $28.0 billion at September 30, 2024 and December 31, 2023, respectively, an allowance for credit losses of nil at both September 30, 2024 and December 31, 2023, and $1.6 billion and $0.2 billion pledged to creditors at September 30, 2024 and December 31, 2023, respectively)	[1]	25,942	25,696
Securities held-to-maturity, net of allowance for credit losses of nil at both September 30, 2024 and December 31, 2023 (fair value of $17.0 billion and $14.7 billion at September 30, 2024 and December 31, 2023, respectively)	[1]	17,238	15,076
Loans (includes $12 million and $15 million designated under fair value option at September 30, 2024 and December 31, 2023, respectively)	[1]	62,014	58,987
Less – allowance for credit losses	[1]	547	591
Loans, net	[1]	61,467	58,396
Loans held for sale (includes $673 million and $250 million designated under fair value option at September 30, 2024 and December 31, 2023, respectively)	[1]	744	339
Properties and equipment, net	[1]	70	71
Goodwill	[1]	458	458
Other assets, net of allowance for credit losses of nil at both September 30, 2024 and December 31, 2023 (includes nil and $10 million designated under fair value option at September 30, 2024 and December 31, 2023, respectively)	[1]	6,804	6,490
Total assets	[1]	167,799	168,238
Domestic deposits:
Noninterest bearing	[1]	21,934	23,421
Interest bearing (includes $2.6 billion and $1.8 billion designated under fair value option at September 30, 2024 and December 31, 2023, respectively)	[1]	95,977	92,604
Foreign deposits - interest bearing	[1]	5,462	5,258
Total deposits	[1]	123,373	121,283
Short-term borrowings	[1]	7,653	9,914
Long-term debt (includes $7.1 billion and $7.5 billion designated under fair value option at September 30, 2024 and December 31, 2023, respectively)	[1]	18,410	18,661
Total debt	[1]	149,436	149,858
Trading liabilities	[1]	2,837	3,485
Interest, taxes and other liabilities (includes nil and $10 million designated under fair value option at September 30, 2024 and December 31, 2023, respectively)	[1]	3,140	3,256
Total liabilities	[1]	155,413	156,599
Equity
Preferred stock (no par value; 40,999,000 shares authorized; 265 shares issued and outstanding at both September 30, 2024 and December 31, 2023)		265	265
Common equity:
Common stock ($5 par value; 150,000,000 shares authorized; 714 shares issued and outstanding at both September 30, 2024 and December 31, 2023)		0	0
Additional paid-in capital		12,734	12,740
Retained earnings		1,034	560
Accumulated other comprehensive loss		(1,647)	(1,926)
Total common equity		12,121	11,374
Total equity		12,386	11,639
Total liabilities and equity		$ 167,799	$ 168,238
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

CONSOLIDATED BALANCE SHEET (U_2

CONSOLIDATED BALANCE SHEET (UNAUDITED) (Parenthetical) - USD ($)		Sep. 30, 2024	Dec. 31, 2023
Trading assets	[1]	$ 21,707,000,000	$ 22,115,000,000
Securities available-for-sale, amortized cost		27,746,000,000	27,980,000,000
Securities available-for-sale, allowance for credit losses		0	0
Fair Value	[1]	25,942,000,000	25,696,000,000
Securities held-to-maturity, allowance for credit losses		0	0
Other assets, allowance for credit losses		0	0
Other assets designated under fair value option		0	10,000,000
Interest, taxes and other liabilities designated under fair value option		$ 0	$ 10,000,000
Preferred stock, par value (usd per share)		$ 0	$ 0
Preferred stock, shares authorized (shares)		40,999,000	40,999,000
Preferred stock, shares issued (shares)		265	265
Preferred stock, shares outstanding (shares)		265	265
Common stock, par value (usd per share)		$ 5	$ 5
Common stock, shares authorized (shares)		150,000,000	150,000,000
Common stock, shares issued (shares)		714	714
Common stock, shares outstanding (shares)		714	714
Assets:
Other assets	[1]	$ 6,804,000,000	$ 6,490,000,000
Total assets	[1]	167,799,000,000	168,238,000,000
Liabilities:
Interest, taxes and other liabilities	[1]	3,140,000,000	3,256,000,000
Total liabilities	[1]	155,413,000,000	156,599,000,000
Fair Value		17,036,000,000	14,689,000,000
Asset Pledged as Collateral with Right
Trading assets		3,417,000,000	3,046,000,000
Fair Value		1,567,000,000	161,000,000
Variable interest entities
Assets:
Other assets		13,000,000	23,000,000
Total assets		13,000,000	23,000,000
Liabilities:
Interest, taxes and other liabilities		21,000,000	17,000,000
Total liabilities		21,000,000	17,000,000
Student loans held for investment
Loans, designated under fair value option		12,000,000	15,000,000
Commercial loans held for sale
Loans held-for-sale, designated under fair value option		673,000,000	250,000,000
Domestic deposits
Deposits designated under fair value option		2,600,000,000	1,800,000,000
Long-term debt
Long-term debt designated under fair value option		$ 7,100,000,000	$ 7,500,000,000
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

CONSOLIDATED STATEMENT OF CHANG

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Preferred stock	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss
Balance at beginning of period at Dec. 31, 2022		$ 265
Balance at beginning of period, common equity at Dec. 31, 2022			$ 0	$ 12,740	$ 1,683	$ (2,575)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Gain on transfer of certain precious metals trading and financing activities to an affiliate, net of tax				8
Employee benefit plans				(7)
Net income	$ 550				550
Cash dividends declared on preferred stock					(8)
Cash dividends declared on common stock					(1,000)
Other comprehensive income (loss), net of tax	(106)					(106)
Balance at end of period, common equity at Sep. 30, 2023	11,285		0	12,741	1,225	(2,681)
Balance at end of period at Sep. 30, 2023	11,550	265
Balance at beginning of period at Jun. 30, 2023		265
Balance at beginning of period, common equity at Jun. 30, 2023			0	12,735	1,043	(2,386)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Gain on transfer of certain precious metals trading and financing activities to an affiliate, net of tax				8
Employee benefit plans				(2)
Net income	182				182
Other comprehensive income (loss), net of tax	(295)					(295)
Balance at end of period, common equity at Sep. 30, 2023	11,285		0	12,741	1,225	(2,681)
Balance at end of period at Sep. 30, 2023	11,550	265
Balance at beginning of period at Dec. 31, 2023	11,639	265
Balance at beginning of period, common equity at Dec. 31, 2023	11,374		0	12,740	560	(1,926)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Gain on transfer of certain precious metals trading and financing activities to an affiliate, net of tax				0
Employee benefit plans				(6)
Net income	482				482
Cash dividends declared on preferred stock					(8)
Cash dividends declared on common stock					0
Other comprehensive income (loss), net of tax	279					279
Balance at end of period, common equity at Sep. 30, 2024	12,121		0	12,734	1,034	(1,647)
Balance at end of period at Sep. 30, 2024	12,386	265
Balance at beginning of period at Jun. 30, 2024		265
Balance at beginning of period, common equity at Jun. 30, 2024			0	12,736	946	(2,093)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Gain on transfer of certain precious metals trading and financing activities to an affiliate, net of tax				0
Employee benefit plans				(2)
Net income	88				88
Other comprehensive income (loss), net of tax	446					446
Balance at end of period, common equity at Sep. 30, 2024	12,121		$ 0	$ 12,734	$ 1,034	$ (1,647)
Balance at end of period at Sep. 30, 2024	$ 12,386	$ 265

CONSOLIDATED STATEMENT OF CASH

CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities
Net income	$ 482	$ 550
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	(36)	19
Provision for credit losses	36	48
Net realized losses (gains) on securities available-for-sale	138	(3)
Net change in other assets and liabilities	(870)	704
Net change in loans held for sale:
Originations and purchases of loans held for sale	(658)	(338)
Sales and collections of loans held for sale	187	284
Net change in trading assets and liabilities	(240)	1,857
Lower of amortized cost or fair value adjustments on loans held for sale	(3)	31
Loss on instruments designated at fair value and related derivatives	33	29
Net cash provided by (used in) operating activities	(931)	3,181
Cash flows from investing activities
Net change in federal funds sold and securities purchased under agreements to resell	9,568	15,336
Securities available-for-sale:
Purchases of securities available-for-sale	(6,517)	(3,293)
Proceeds from sales of securities available-for-sale	4,317	681
Proceeds from paydowns and maturities of securities available-for-sale	2,727	3,954
Securities held-to-maturity:
Purchases of securities held-to-maturity	(3,039)	(7,267)
Proceeds from paydowns and maturities of securities held-to-maturity	914	641
Change in loans:
Originations, net of collections	(5,326)	790
Loans sold to third parties	2,395	547
Net cash provided by (used for) sales (acquisitions) of properties and equipment	(9)	1
Cash received on transfer of certain precious metals trading and financing activities to an affiliate	0	10
Other, net	(94)	(35)
Net cash provided by investing activities	4,936	11,365
Cash flows from financing activities
Net change in deposits	2,007	(3,227)
Debt:
Net change in short-term borrowings	(2,261)	2,089
Issuance of long-term debt	5,267	3,471
Repayment of long-term debt	(5,664)	(3,002)
Other decreases in capital surplus	(6)	(7)
Dividends paid	(8)	(1,008)
Net cash used in financing activities	(665)	(1,684)
Net change in cash and due from banks and interest bearing deposits with banks	3,340	12,862
Cash and due from banks and interest bearing deposits with banks at beginning of period	25,719	18,748
Cash and due from banks and interest bearing deposits with banks at end of period	$ 29,059	$ 31,610

Organization and Presentation

Organization and Presentation	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Presentation	Organization and Presentation HSBC USA Inc. ("HSBC USA"), incorporated under the laws of Maryland, is a New York State based bank holding company and a wholly-owned subsidiary of HSBC North America Holdings Inc. ("HSBC North America"), which is an indirect wholly-owned subsidiary of HSBC Holdings plc ("HSBC" and, together with its subsidiaries, "HSBC Group"). The accompanying unaudited interim consolidated financial statements of HSBC USA and its subsidiaries (collectively "HUSI") have been prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X, as well as in accordance with predominant practices within the banking industry. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. HSBC USA's principal U.S. banking subsidiary is HSBC Bank USA, National Association (together with its subsidiaries, "HSBC Bank USA"). In the opinion of management, all normal and recurring adjustments considered necessary for a fair statement of financial position, results of operations and cash flows for the interim periods have been made. HUSI may also be referred to in these notes to the consolidated financial statements as "we," "us" or "our." These unaudited interim consolidated financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2023 (the "2023 Form 10-K"). The preparation of financial statements in conformity with U.S. GAAP requires the use of estimates and assumptions that affect reported amounts and disclosures. Actual results could differ from those estimates. Interim results should not be considered indicative of results in future periods.

Trading Assets and Liabilities

Trading Assets and Liabilities	9 Months Ended
	Sep. 30, 2024
Trading Assets And Liabilities [Abstract]
Trading Assets and Liabilities	Trading Assets and Liabilities Trading assets and liabilities consisted of the following: September 30, 2024 December 31, 2023 (in millions) Trading assets: U.S. Treasury $ 4,038 $ 3,564 U.S. Government agency issued or guaranteed 1 1 U.S. Government sponsored enterprises 1,228 1,207 Foreign bonds 759 4,019 Equity securities 14,344 11,702 Precious metals 160 346 Derivatives, net 1,177 1,276 Total trading assets $ 21,707 $ 22,115 Trading liabilities: Securities sold, not yet purchased $ 1,528 $ 1,688 Payables for precious metals 238 301 Derivatives, net 1,071 1,496 Total trading liabilities $ 2,837 $ 3,485 At September 30, 2024 and December 31, 2023, the fair value of derivatives included in trading assets is net of $889 million and $1,416 million, respectively, relating to amounts recognized for the obligation to return cash collateral received under master netting agreements with derivative counterparties. At September 30, 2024 and December 31, 2023, the fair value of derivatives included in trading liabilities is net of $1,511 million and $1,321 million, respectively, relating to amounts recognized for the right to reclaim cash collateral paid under master netting agreements with derivative counterparties. See Note 8, "Derivative Financial Instruments," for further information on our trading derivatives and related collateral. Dividend income on equity securities held for trading, which is recorded in interest income in the consolidated statement of income, totaled $46 million and $133 million during the three and nine months ended September 30, 2024, respectively, compared with $41 million and $111 million during the three and nine months ended September 30, 2023, respectively. Trading security positions are primarily held as economic hedges of derivative products issued to our clients.

Securities

Securities	9 Months Ended
	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Securities	Securities Our securities available-for-sale and securities held-to-maturity portfolios consisted of the following: September 30, 2024 Amortized Allowance for Credit Losses Unrealized Unrealized Fair (in millions) Securities available-for-sale: U.S. Treasury $ 9,318 $ — $ 13 $ (219) $ 9,112 U.S. Government sponsored enterprises: Mortgage-backed securities 3,325 — — (565) 2,760 Collateralized mortgage obligations 1,349 — — (265) 1,084 Direct agency obligations 1,406 — 1 (7) 1,400 U.S. Government agency issued or guaranteed: Mortgage-backed securities 5,430 — 2 (318) 5,114 Collateralized mortgage obligations 2,668 — — (438) 2,230 Direct agency obligations 167 — 3 — 170 Asset-backed securities collateralized by: Home equity 11 — — (1) 10 Other 102 — — (10) 92 Foreign debt securities (1) 3,970 — 1 (1) 3,970 Total available-for-sale securities $ 27,746 $ — $ 20 $ (1,824) $ 25,942 Securities held-to-maturity: U.S. Treasury $ 2,797 $ — $ 7 $ (6) $ 2,798 U.S. Government sponsored enterprises: Mortgage-backed securities 1,020 — — (46) 974 Collateralized mortgage obligations 257 — 4 (10) 251 U.S. Government agency issued or guaranteed: Mortgage-backed securities 11,594 — 92 (130) 11,556 Collateralized mortgage obligations 1,567 — — (113) 1,454 Obligations of U.S. states and political subdivisions 3 — — — 3 Total held-to-maturity securities $ 17,238 $ — $ 103 $ (305) $ 17,036 December 31, 2023 Amortized Allowance for Credit Losses Unrealized Unrealized Fair (in millions) Securities available-for-sale: U.S. Treasury $ 7,489 $ — $ 22 $ (225) $ 7,286 U.S. Government sponsored enterprises: Mortgage-backed securities 5,864 — — (845) 5,019 Collateralized mortgage obligations 1,436 — — (300) 1,136 Direct agency obligations 1,719 — — (38) 1,681 U.S. Government agency issued or guaranteed: Mortgage-backed securities 5,804 — 1 (378) 5,427 Collateralized mortgage obligations 2,865 — — (506) 2,359 Direct agency obligations 215 — 3 (3) 215 Asset-backed securities collateralized by: Home equity 13 — — (1) 12 Other 103 — — (11) 92 Foreign debt securities (1) 2,472 — — (3) 2,469 Total available-for-sale securities $ 27,980 $ — $ 26 $ (2,310) $ 25,696 Securities held-to-maturity: U.S. Treasury $ 1,917 $ — $ 1 $ (18) $ 1,900 U.S. Government sponsored enterprises: Mortgage-backed securities 1,069 — — (68) 1,001 Collateralized mortgage obligations 297 — 3 (16) 284 U.S. Government agency issued or guaranteed: Mortgage-backed securities 10,043 — 43 (180) 9,906 Collateralized mortgage obligations 1,745 — — (152) 1,593 Obligations of U.S. states and political subdivisions 4 — — — 4 Asset-backed securities collateralized by residential mortgages 1 — — — 1 Total held-to-maturity securities $ 15,076 $ — $ 47 $ (434) $ 14,689 (1) Foreign debt securities represent public sector entity, bank or corporate debt. Securities Available-for-Sale The following provides additional information about our portfolio of securities available-for-sale: Allowance for credit losses On a quarterly basis, we perform an assessment to determine whether there have been any events or economic circumstances to indicate that a debt security available-for-sale in an unrealized loss position has suffered impairment due to credit factors. A debt security available-for-sale is considered impaired if its fair value is less than its amortized cost basis at the reporting date. If impaired, we assess whether the impairment is due to credit factors. If we intend to sell the debt security or if it is more-likely-than-not that we will be required to sell the debt security before the recovery of its amortized cost basis, the impairment is recognized and the unrealized loss is recorded as a direct write-down of the security's amortized cost basis with an offsetting charge to earnings. If we do not intend to sell the debt security or believe we will not be required to sell the debt security before the recovery of its amortized cost basis, the impairment is assessed to determine if a credit loss component exists. We use a discounted cash flow method to determine the credit loss component. In the event a credit loss exists, an allowance for credit losses is recorded in earnings for the credit loss component of the impairment while the remaining portion of the impairment attributable to factors other than credit loss is recognized, net of tax, in other comprehensive income (loss). The amount of impairment recognized due to credit factors is limited to the excess of the amortized cost basis over the fair value of the security available-for-sale. In determining whether a credit loss component exists, we consider a series of factors which include: • The extent to which the fair value is less than the amortized cost basis; • The credit protection features embedded within the instrument, which include but are not limited to credit subordination positions, payment structure, overcollateralization, protective triggers and financial guarantees provided by third parties; • Changes in the near term prospects of the issuer or the underlying collateral of a security such as changes in default rates, loss severities given default and significant changes in prepayment assumptions; • The level of excess cash flows generated from the underlying collateral supporting the principal and interest payments of the debt securities; and • Any adverse change to the credit conditions of the issuer, the monoline insurer or the security such as credit downgrades by external rating agencies or changes to internal ratings. At both September 30, 2024 and December 31, 2023, the allowance for credit losses on securities available-for-sale was nil. Securities in an unrealized loss position for which no allowance for credit losses has been recognized The following table summarizes gross unrealized losses and related fair values for securities available-for-sale by major security type at September 30, 2024 and December 31, 2023 classified as to the length of time the losses have existed: One Year or Less Greater Than One Year Number Gross Aggregate Number Gross Aggregate (dollars are in millions) At September 30, 2024 U.S. Treasury 12 $ (9) $ 3,118 38 $ (210) $ 4,288 U.S. Government sponsored enterprises 1 — 71 143 (837) 4,735 U.S. Government agency issued or guaranteed — — — 137 (756) 6,794 Asset-backed securities — — — 6 (11) 103 Foreign debt securities 18 (1) 1,530 1 — 50 Securities available-for-sale 31 $ (10) $ 4,719 325 $ (1,814) $ 15,970 At December 31, 2023 U.S. Treasury 3 $ (1) $ 1,008 41 $ (224) $ 4,906 U.S. Government sponsored enterprises 2 — 80 293 (1,183) 7,701 U.S. Government agency issued or guaranteed — — — 151 (887) 7,765 Asset-backed securities — — — 6 (12) 104 Foreign debt securities 17 (1) 1,801 4 (2) 183 Securities available-for-sale 22 $ (2) $ 2,889 495 $ (2,308) $ 20,659 Gross unrealized losses decreased as compared with December 31, 2023 due primarily to decreasing yields on U.S. Government sponsored mortgage-backed and U.S. Government agency mortgage-backed securities as well as the sale of certain securities that were in an unrealized loss position at December 31, 2023. Although the fair value of a particular security may be below its amortized cost, it does not necessarily result in a credit loss and hence an allowance for credit losses. The decline in fair value may be caused by, among other things, higher market rates or the illiquidity of the market. We have reviewed the securities in an unrealized loss position for which no allowance for credit losses has been recognized in accordance with our accounting policies, discussed further above. At September 30, 2024, we do not consider any of these securities to be impaired due to credit factors as we expect to recover their amortized cost basis and we neither intend nor expect to be required to sell these securities prior to recovery, even if that equates to holding them until their individual maturities. However, impairments due to credit factors may occur in future periods if the credit quality of the securities deteriorates. Securities Held-to-Maturity The following provides additional information about our portfolio of securities held-to-maturity: Allowance for credit losses We exclude from our calculation of lifetime expected credit losses ("ECL") securities for which we expect that non-payment of the amortized cost basis will be zero ("Zero Expected Credit Loss Exception"). Due to the composition of our portfolio of securities held-to-maturity, substantially all of our portfolio qualifies for the Zero Expected Credit Loss Exception and has been excluded from our lifetime ECL calculation. At both September 30, 2024 and December 31, 2023, the allowance for credit losses on securities held-to-maturity was nil. At both September 30, 2024 and December 31, 2023, none of our securities held-to-maturity were past due or in nonaccrual status. Credit risk profile Securities are assigned a credit rating based on the estimated probability of default. The credit ratings are used as a credit quality indicator to monitor our securities held-to-maturity portfolio. We utilize Standard and Poor's ("S&P") as the primary source of our credit ratings. If S&P ratings are not available, ratings by Moody's and Fitch are used in that order. Investment grade includes securities with credit ratings of at least BBB- or above. At both September 30, 2024 and December 31, 2023, all of our securities held-to-maturity were investment grade. Other securities gains (losses), net The following table summarizes realized gains and losses on investment securities transactions attributable to available-for-sale securities: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 (in millions) Gross realized gains $ 1 $ — $ 15 $ 3 Gross realized losses (149) — (153) — Net realized gains (losses) $ (148) $ — $ (138) $ 3 During the third quarter of 2024, we sold certain U.S. Government sponsored mortgage-backed securities classified as available-for-sale with a total carrying value of $2,130 million and realized a loss of $148 million. These securities were sold to manage our exposure to the changing interest rate environment as part of our continuing strategy to maximize returns while balancing the securities portfolio for risk management purposes. We have reinvested the proceeds into higher yielding U.S. Treasury and U.S. Government agency mortgage-backed securities classified as held-to-maturity. Contractual Maturities and Yields The following table summarizes the amortized cost and fair values of securities available-for-sale and securities held-to-maturity at September 30, 2024 by contractual maturity. Expected maturities differ from contractual maturities because borrowers have the right to prepay obligations without prepayment penalties in certain cases. The table below also reflects the distribution of maturities of debt securities held at September 30, 2024, together with the approximate yield of the portfolio. The yields shown are calculated by dividing annualized interest income, including the accretion of discounts and the amortization of premiums, by the amortized cost of securities outstanding at September 30, 2024. Within After One After Five After Ten Amount Yield Amount Yield Amount Yield Amount Yield (dollars are in millions) Available-for-sale: U.S. Treasury $ 243 .98 % $ 3,815 2.17 % $ 2,380 3.97 % $ 2,880 2.65 % U.S. Government sponsored enterprises 579 1.15 178 2.99 650 1.97 4,673 1.80 U.S. Government agency issued or guaranteed 20 .81 — — 2 4.65 8,243 2.92 Asset-backed securities — — 54 4.40 47 3.93 12 4.85 Foreign debt securities 1,825 .34 2,054 4.36 91 3.81 — — Total amortized cost $ 2,667 .58 % $ 6,101 2.95 % $ 3,170 3.55 % $ 15,808 2.54 % Total fair value $ 2,664 $ 6,057 $ 3,153 $ 14,068 Held-to-maturity: U.S. Treasury $ — — % $ 2,048 3.65 % $ 749 3.71 % $ — — % U.S. Government sponsored enterprises 84 2.30 219 2.82 610 3.70 364 2.86 U.S. Government agency issued or guaranteed — — 1 3.94 12 5.91 13,148 4.52 Obligations of U.S. states and political subdivisions 1 4.04 2 3.77 — — — — Total amortized cost $ 85 2.32 % $ 2,270 3.57 % $ 1,371 3.73 % $ 13,512 4.48 % Total fair value $ 85 $ 2,266 $ 1,346 $ 13,339 Equity Securities Equity securities that are not classified as trading and are included in other assets consisted of the following: September 30, 2024 December 31, 2023 (in millions) Equity securities carried at fair value $ 260 $ 270 Equity securities without readily determinable fair values 12 13 On a quarterly basis, we perform an assessment to determine whether any equity securities without readily determinable fair values are impaired. In the event an equity security is deemed impaired, the security is written down to fair value with impairment recorded in earnings. During the nine months ended September 30, 2024 and 2023, we determined that certain equity securities without readily determinable fair values were impaired and, as a result, we recorded an impairment loss of $4 million in both periods as a component of other income (loss) in the consolidated statement of income. Also included in other assets were investments in Federal Home Loan Bank ("FHLB") stock and Federal Reserve Bank stock of $95 million and $438 million, respectively, at both September 30, 2024 and December 31, 2023. Our investment in Federal Reserve Bank stock represents approximately half of the total subscription price for our subscribed shares. The remaining half is unpaid and remains subject to call by the Federal Reserve Board ("FRB").

Loans

Loans	9 Months Ended
	Sep. 30, 2024
Receivables [Abstract]
Loans	Loans Loans consisted of the following: September 30, 2024 December 31, 2023 (in millions) Commercial loans: Real estate, including construction $ 6,795 $ 7,087 Business and corporate banking 16,420 15,724 Global banking (1) 10,573 10,725 Other commercial: Affiliates (2) 3,784 2,618 Other 3,543 3,803 Total other commercial 7,327 6,421 Total commercial 41,115 39,957 Consumer loans: Residential mortgages 20,235 18,341 Home equity mortgages 393 389 Credit cards 185 199 Other consumer (3) 86 101 Total consumer 20,899 19,030 Total loans $ 62,014 $ 58,987 (1) Represents large multinational firms including globally focused U.S. corporate and financial institutions, U.S. dollar lending to multinational banking clients managed by HSBC on a global basis and complex large business clients supported by Global Banking and Markets relationship managers. (2) See Note 12, "Related Party Transactions," for additional information regarding loans to HSBC affiliates. (3) Includes certain student loans that we have elected to designate under the fair value option and are therefore carried at fair value, which totaled $12 million and $15 million at September 30, 2024 and December 31, 2023, respectively. See Note 9, "Fair Value Option," for further details. Net deferred origination costs totaled $27 million and $17 million at September 30, 2024 and December 31, 2023, respectively. At September 30, 2024 and December 31, 2023, we had a net unamortized discount on our loans of $8 million and $13 million, respectively. Aging Analysis of Past Due Loans The following table summarizes the past due status of our loans at September 30, 2024 and December 31, 2023. The aging of past due amounts is determined based on the contractual delinquency status of payments under the loan. An account is generally considered to be contractually delinquent when payments have not been made in accordance with the loan terms. Delinquency status is affected by customer account management policies and practices such as re-age, which results in the re-setting of the contractual delinquency status to current. Past Due Total Past Due 30 Days or More 30 - 89 Days 90+ Days Current (1) Total Loans (in millions) At September 30, 2024 Commercial loans: Real estate, including construction $ — $ 21 $ 21 $ 6,774 $ 6,795 Business and corporate banking 2 49 51 16,369 16,420 Global banking — 47 47 10,526 10,573 Other commercial 182 — 182 7,145 7,327 Total commercial 184 117 301 40,814 41,115 Consumer loans: Residential mortgages 172 96 268 19,967 20,235 Home equity mortgages 2 5 7 386 393 Credit cards 2 2 4 181 185 Other consumer 3 2 5 81 86 Total consumer 179 105 284 20,615 20,899 Total loans $ 363 $ 222 $ 585 $ 61,429 $ 62,014 At December 31, 2023 Commercial loans: Real estate, including construction $ — $ 206 $ 206 $ 6,881 $ 7,087 Business and corporate banking 1 3 4 15,720 15,724 Global banking — 1 1 10,724 10,725 Other commercial 350 — 350 6,071 6,421 Total commercial 351 210 561 39,396 39,957 Consumer loans: Residential mortgages 174 91 265 18,076 18,341 Home equity mortgages 12 3 15 374 389 Credit cards 3 3 6 193 199 Other consumer 3 2 5 96 101 Total consumer 192 99 291 18,739 19,030 Total loans $ 543 $ 309 $ 852 $ 58,135 $ 58,987 (1) Loans less than 30 days past due are presented as current. Nonperforming Loans Nonperforming loans, including nonaccrual loans and accruing loans contractually 90 days or more past due, consisted of the following: Nonaccrual Loans Accruing Loans Contractually Past Due 90 Days or More Nonaccrual Loans With No Allowance For Credit Losses (in millions) At September 30, 2024 Commercial loans: Real estate, including construction $ 304 $ — $ — Business and corporate banking 59 — 6 Global banking 230 — 43 Other commercial — — — Total commercial 593 — 49 Consumer loans: Residential mortgages (1)(2)(3) 162 — 82 Home equity mortgages (1)(2) 6 — 5 Credit cards — 2 — Other consumer — 2 — Total consumer 168 4 87 Total nonperforming loans $ 761 $ 4 $ 136 At December 31, 2023 Commercial loans: Real estate, including construction $ 229 $ — $ 40 Business and corporate banking 143 1 29 Global banking 49 — 48 Other commercial 3 — 2 Total commercial 424 1 119 Consumer loans: Residential mortgages (1)(2)(3) 172 — 81 Home equity mortgages (1)(2) 6 — 5 Credit cards — 3 — Other consumer — 2 — Total consumer 178 5 86 Total nonperforming loans $ 602 $ 6 $ 205 (1) At September 30, 2024 and December 31, 2023, nonaccrual consumer mortgage loans include $107 million and $108 million, respectively, of loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell. (2) Nonaccrual consumer mortgage loans include all loans which are 90 or more days contractually delinquent as well as loans discharged under Chapter 7 bankruptcy and not re-affirmed and second lien loans where the first lien loan that we own or service is 90 or more days contractually delinquent. (3) Nonaccrual consumer mortgage loans for all periods does not include guaranteed loans purchased from the Government National Mortgage Association. Repayment of these loans is predominantly insured by the Federal Housing Administration and as such, these loans have different risk characteristics from the rest of our consumer loan portfolio. Interest income that was recorded on nonaccrual loans and included in interest income totaled $11 million and $19 million during the three and nine months ended September 30, 2024, respectively, compared with nil and $3 million during the three and nine months ended September 30, 2023, respectively. Collateral-Dependent Loans Loans for which the repayment is expected to be provided substantially through the operation or sale of the collateral and the borrower is experiencing financial difficulty are considered to be collateral-dependent loans. Collateral can have a significant financial effect in mitigating our exposure to credit risk. Collateral-dependent residential mortgage loans are carried at the lower of amortized cost or fair value of the collateral less costs to sell, with any excess in the carrying amount of the loan generally charged off at the time foreclosure is initiated or when settlement is reached with the borrower, but not to exceed the end of the month in which the account becomes six months contractually delinquent. Collateral values are based on broker price opinions or appraisals which are updated at least every 180 days less estimated costs to sell. During the quarterly period between updates, real estate price trends are reviewed on a geographic basis and incorporated as necessary. At September 30, 2024 and December 31, 2023, we had collateral-dependent residential mortgage loans totaling $287 million and $278 million, respectively. For collateral-dependent commercial loans, the allowance for expected credit losses is individually assessed based on the fair value of the collateral. Various types of collateral are used, including real estate, inventory, equipment, accounts receivable, securities and cash, among others. For commercial real estate loans, collateral values are generally based on appraisals which are updated based on management judgment under the specific circumstances on a case-by-case basis. In situations where an appraisal is not used, borrower-specific factors such as operating results, cash flows and debt service ratios are reviewed along with relevant market data of comparable properties in order to create a 10-year cash flow model to be discounted at appropriate rates to present value. The collateral value for securities is based on their quoted market prices or broker quotes. The collateral value for other financial assets is generally based on appraisals or is estimated using a discounted cash flow analysis. Commercial loan balances are charged off at the time all or a portion of the balance is deemed uncollectible. At September 30, 2024 and December 31, 2023, we had collateral-dependent commercial loans totaling $611 million and $618 million, respectively. Loan Modifications In conjunction with our loss mitigation activities, we modify certain loans to borrowers experiencing financial difficulty. Modifications may include changes to one or more terms of the loan, including, but not limited to, a change in interest rate, extension of the term, reduction in payment amount and partial forgiveness or deferment of principal, accrued interest or other loan covenants. The following disclosures provide information about loan payment modifications made to borrowers experiencing financial difficulty in the form of an interest rate reduction, principal forgiveness, a term extension or significant payment deferral, or a combination thereof. Not included are loans with short-term payment modifications (e.g., deferrals of three months or less) and other insignificant modifications, such as covenant waivers and amendments, and deferrals of financial statement and covenant compliance reporting requirements. Commercial loan payment modifications typically involve term extensions. In certain cases, the term extension is coupled with an interest rate increase which is intended to reduce the financial effect of extending the life of the loan. The effects of these interest rate increases are not included in the following disclosures. For consumer loans, payment modifications typically involve payment deferrals or interest rate reductions which lower the amount of interest income we are contractually entitled to receive in future periods. Through lowering the interest rate, we believe we are able to increase the amount of cash flow that will ultimately be collected from the loan, given the borrower's financial condition. The following table presents information about loan payment modifications made to borrowers experiencing financial difficulty during the three and nine months ended September 30, 2024 and 2023 by type of modification, including the period-end carrying value and as a percentage of total loans. During the three months ended September 30, 2024, loan payment modifications made to consumer borrowers experiencing financial difficulty were nil. Interest Rate Reduction Principal Forgiveness Term Extension / Significant Payment Deferral Combination (1) Total % of Total Loans (dollars are in millions) Three Months Ended September 30, 2024 Commercial loans: Real estate, including construction $ — $ 33 $ 43 $ — $ 76 1.1 % Business and corporate banking — — 6 — 6 .0 Total commercial — 33 49 — 82 .2 Interest Rate Reduction Principal Forgiveness Term Extension / Significant Payment Deferral Combination (1) Total % of Total Loans (dollars are in millions) Three Months Ended September 30, 2023 Commercial loans: Real estate, including construction $ — $ — $ 2 $ — $ 2 .0 % Business and corporate banking — — 53 — 53 .3 Total commercial — — 55 — 55 .1 Consumer loans: Residential mortgages (2) — — 2 — 2 .0 Total consumer — — 2 — 2 .0 Total $ — $ — $ 57 $ — $ 57 .1 Nine Months Ended September 30, 2024 Commercial loans: Real estate, including construction $ — $ 33 $ 43 $ 159 $ 235 3.5 % Business and corporate banking — — 37 5 42 .3 Global banking — — 35 — 35 .3 Total commercial — 33 115 164 312 .8 Consumer loans: Residential mortgages (2) — — — 1 1 .0 Total consumer — — — 1 1 .0 Total $ — $ 33 $ 115 $ 165 $ 313 .5 Nine Months Ended September 30, 2023 Commercial loans: Real estate, including construction $ — $ — $ 172 $ — $ 172 2.5 % Business and corporate banking — — 128 — 128 .8 Global banking — — 5 — 5 .1 Total commercial — — 305 — 305 .8 Consumer loans: Residential mortgages (2) — — 10 1 11 .1 Total consumer — — 10 1 11 .1 Total $ — $ — $ 315 $ 1 $ 316 .5 (1) Represents loans with more than one type of payment modification during the period. (2) The carrying values of consumer mortgage loans with a payment modification primarily includes loans that were recorded at the lower of amortized cost or fair value of the collateral less cost to sell. At September 30, 2024 and December 31, 2023, additional commitments to lend to commercial borrowers who were provided with a loan payment modification during the respective year-to-date periods totaled $43 million and $85 million, respectively. The following table summarizes the financial effect of loan payment modifications made to borrowers experiencing financial difficulty during the three and nine months ended September 30, 2024 and 2023 by type of modification: Weighted-Average Interest Rate Reduction Principal Forgiven Weighted-Average Term Extension / Payment Deferral Three Months Ended September 30, 2024 Commercial loans: Real estate, including construction — % $ — 2.2 Business and corporate banking — — 1.6 Three Months Ended September 30, 2023 Commercial loans: Real estate, including construction — % $ — 0.2 Business and corporate banking — — 1.1 Consumer loans: Residential mortgages — — 0.8 Nine Months Ended September 30, 2024 Commercial loans: Real estate, including construction 5.6 % $ — 3.1 Business and corporate banking .3 — 1.7 Global banking — — 2.0 Consumer loans: Residential mortgages .5 — 0.6 Nine Months Ended September 30, 2023 Commercial loans: Real estate, including construction — % $ — 0.4 Business and corporate banking — 2 1.9 Global banking — — 2.0 Consumer loans: Residential mortgages 2.2 — 2.0 The effect of most modifications made to borrowers experiencing financial difficulty is already included in the allowance for credit losses because of the methodology used to estimate lifetime ECL, which considers historical loss information including losses from modifications of loans to borrowers experiencing financial difficulty. As a result, a material change to the allowance for credit losses is generally not recorded upon modification. In instances when a loan is modified in the form of principal forgiveness, the amount of principal forgiven is deemed uncollectible and that portion of the loan balance is charged off with a corresponding reduction to the allowance for credit losses. We closely monitor the performance of modified loans to understand the effectiveness of our loss mitigation efforts. Upon determination that a modified loan or a portion of a modified loan has subsequently been deemed uncollectible, the loan or a portion of the loan is charged off in accordance with our accounting policies with a corresponding reduction to the allowance for credit losses. The following table presents loans to borrowers experiencing financial difficulty with a payment modification during the previous 12 months which subsequently became 90 days or greater contractually delinquent during the three and nine months ended September 30, 2024 by type of modification: Interest Rate Reduction Principal Forgiveness Term Extension / Significant Payment Deferral Combination (1) Total (in millions) Nine Months Ended September 30, 2024 Commercial loans: Global banking $ — $ — $ 1 $ — $ 1 Total commercial $ — $ — $ 1 $ — $ 1 (1) Represents loans with more than one type of payment modification during the period. During the three and nine months ended September 30, 2024, there were no consumer loans to borrowers experiencing financial difficulty with a payment modification during the previous 12 months which subsequently became 90 days or greater contractually delinquent. During the three months ended September 30, 2024, there were also no commercial loans to borrowers experiencing financial difficulty with a payment modification during the previous 12 months which subsequently became 90 days or greater contractually delinquent. During both the three and nine months ended September 30, 2023, there were no loans to borrowers experiencing financial difficulty with a payment modification during the previous nine months which subsequently became 90 days or greater contractually delinquent. The following table presents the past due status of loans to borrowers experiencing financial difficulty with a payment modification during the previous 12 months at September 30, 2024 and December 31, 2023: Past Due 30 - 89 Days 90+ Days Current (1) Total (in millions) At September 30, 2024 Commercial loans: Real estate, including construction $ — $ — $ 236 $ 236 Business and corporate banking — — 267 267 Global banking — — 74 74 Total commercial — — 577 577 Consumer loans: Residential mortgages 1 — 7 8 Total consumer 1 — 7 8 Total $ 1 $ — $ 584 $ 585 At December 31, 2023 Commercial loans: Real estate, including construction $ — $ 166 $ 2 $ 168 Business and corporate banking — — 398 398 Global banking — — 50 50 Total commercial — 166 450 616 Consumer loans: Residential mortgages — — 12 12 Total consumer — — 12 12 Total $ — $ 166 $ 462 $ 628 (1) Loans less than 30 days past due are presented as current. Commercial Loan Credit Quality Indicators and Gross Charge-offs by Year of Origination The following credit quality indicators are utilized to monitor our commercial loan portfolio: Criticized loans Criticized loan classifications presented in the table below are determined by the assignment of various criticized facility risk ratings based on the risk rating standards of our regulator. The following facility risk ratings are deemed to be criticized: Special Mention - generally includes loans that are protected by collateral and/or the credit worthiness of the customer, but are potentially weak based upon economic or market circumstances which, if not checked or corrected, could weaken our credit position at some future date. Substandard - includes loans that are inadequately protected by the underlying collateral and/or general credit worthiness of the customer. These loans present a distinct possibility that we will sustain some loss if the deficiencies are not corrected. Doubtful - includes loans that have all the weaknesses exhibited by substandard loans, with the added characteristic that the weaknesses make collection or liquidation in full of the recorded loan highly improbable. However, although the possibility of loss is extremely high, certain factors exist which may strengthen the credit at some future date, and therefore the decision to charge-off the loan is deferred. Loans graded as doubtful are required to be placed in nonaccrual status. The following table summarizes our criticized commercial loans, including a disaggregation of the loans by year of origination as of September 30, 2024 and December 31, 2023: 2024 2023 2022 2021 2020 Prior Revolving Revolving Loans Converted to Term Loans Total at Sep. 30, 2024 (in millions) Real estate, including construction: Special mention $ — $ — $ 104 $ — $ — $ 18 $ — $ — $ 122 Substandard — — 64 — — 521 — — 585 Doubtful — — — 33 — 249 20 — 302 Total real estate, including construction — — 168 33 — 788 20 — 1,009 Business and corporate banking: Special mention 172 128 104 20 4 219 148 11 806 Substandard 138 118 44 43 — 157 593 6 1,099 Doubtful 6 6 — — — 6 40 — 58 Total business and corporate banking 316 252 148 63 4 382 781 17 1,963 Global banking: Special mention — — — — — — 37 — 37 Substandard — — — — 20 86 166 — 272 Doubtful — — — — — 180 9 — 189 Total global banking — — — — 20 266 212 — 498 Total commercial $ 316 $ 252 $ 316 $ 96 $ 24 $ 1,436 $ 1,013 $ 17 $ 3,470 Total commercial: Special mention $ 172 $ 128 $ 208 $ 20 $ 4 $ 237 $ 185 $ 11 $ 965 Substandard 138 118 108 43 20 764 759 6 1,956 Doubtful 6 6 — 33 — 435 69 — 549 Total commercial $ 316 $ 252 $ 316 $ 96 $ 24 $ 1,436 $ 1,013 $ 17 $ 3,470 2023 2022 2021 2020 2019 Prior Revolving Revolving Loans Converted to Term Loans Total at Dec. 31, 2023 (in millions) Real estate, including construction: Special mention $ — $ 40 $ — $ 104 $ 92 $ 42 $ 3 $ 3 $ 284 Substandard 2 — — 1 — 821 — — 824 Doubtful — — — — — 166 18 — 184 Total real estate, including construction 2 40 — 105 92 1,029 21 3 1,292 Business and corporate banking: Special mention 38 103 12 4 20 126 296 8 607 Substandard 31 22 — 27 — 156 746 1 983 Doubtful — — 36 — — 9 71 — 116 Total business and corporate banking 69 125 48 31 20 291 1,113 9 1,706 Global banking: Special mention — — — — — 45 62 — 107 Substandard — 14 — — — 114 73 — 201 Doubtful — 187 — — 14 — 1 — 202 Total global banking — 201 — — 14 159 136 — 510 Other commercial: Special mention 6 — — — — — — — 6 Substandard 38 — — — — — — — 38 Doubtful — — — — — — 3 — 3 Total other commercial 44 — — — — — 3 — 47 Total commercial $ 115 $ 366 $ 48 $ 136 $ 126 $ 1,479 $ 1,273 $ 12 $ 3,555 Total commercial: Special mention $ 44 $ 143 $ 12 $ 108 $ 112 $ 213 $ 361 $ 11 $ 1,004 Substandard 71 36 — 28 — 1,091 819 1 2,046 Doubtful — 187 36 — 14 175 93 — 505 Total commercial $ 115 $ 366 $ 48 $ 136 $ 126 $ 1,479 $ 1,273 $ 12 $ 3,555 Nonperforming The following table summarizes the nonperforming status of our commercial loan portfolio, including a disaggregation of the loans by year of origination as of September 30, 2024 and December 31, 2023: 2024 2023 2022 2021 2020 Prior Revolving Revolving Loans Converted to Term Loans Total at Sep. 30, 2024 (in millions) Real estate, including construction: Performing loans $ 638 $ 1,039 $ 1,217 $ 850 $ 262 $ 2,464 $ 18 $ 3 $ 6,491 Nonaccrual loans — — — 33 — 251 20 — 304 Total real estate, including construction 638 1,039 1,217 883 262 2,715 38 3 6,795 Business and corporate banking: Performing loans 1,403 1,350 1,118 1,261 176 4,090 6,655 308 16,361 Nonaccrual loans 6 6 — — — 6 41 — 59 Total business and corporate banking 1,409 1,356 1,118 1,261 176 4,096 6,696 308 16,420 Global banking: Performing loans 935 1,768 849 660 116 4,274 1,741 — 10,343 Nonaccrual loans — — — — — 221 9 — 230 Total global banking 935 1,768 849 660 116 4,495 1,750 — 10,573 Other commercial: Performing loans 271 144 262 324 486 1,145 4,695 — 7,327 Nonaccrual loans — — — — — — — — — Total other commercial 271 144 262 324 486 1,145 4,695 — 7,327 Total commercial $ 3,253 $ 4,307 $ 3,446 $ 3,128 $ 1,040 $ 12,451 $ 13,179 $ 311 $ 41,115 Total commercial: Performing loans $ 3,247 $ 4,301 $ 3,446 $ 3,095 $ 1,040 $ 11,973 $ 13,109 $ 311 $ 40,522 Nonaccrual loans 6 6 — 33 — 478 70 — 593 Total commercial $ 3,253 $ 4,307 $ 3,446 $ 3,128 $ 1,040 $ 12,451 $ 13,179 $ 311 $ 41,115 2023 2022 2021 2020 2019 Prior Revolving Revolving Loans Converted to Term Loans Total at Dec. 31, 2023 (in millions) Real estate, including construction: Performing loans $ 920 $ 1,286 $ 1,019 $ 355 $ 1,014 $ 2,242 $ 19 $ 3 $ 6,858 Nonaccrual loans — — — — 40 167 22 — 229 Total real estate, including construction 920 1,286 1,019 355 1,054 2,409 41 3 7,087 Business and corporate banking: Performing loans 1,270 1,113 1,074 231 561 4,215 6,851 265 15,580 Nonaccrual loans — 35 — — — 38 70 — 143 Accruing loans contractually past due 90 days or more — — — — — — 1 — 1 Total business and corporate banking 1,270 1,148 1,074 231 561 4,253 6,922 265 15,724 Global banking: Performing loans 2,255 1,153 844 151 321 3,561 2,341 50 10,676 Nonaccrual loans — — — — — 39 10 — 49 Total global banking 2,255 1,153 844 151 321 3,600 2,351 50 10,725 Other commercial: Performing loans 211 281 313 651 418 804 3,740 — 6,418 Nonaccrual loans — — — — — 3 — — 3 Total other commercial 211 281 313 651 418 807 3,740 — 6,421 Total commercial $ 4,656 $ 3,868 $ 3,250 $ 1,388 $ 2,354 $ 11,069 $ 13,054 $ 318 $ 39,957 Total commercial: Performing loans $ 4,656 $ 3,833 $ 3,250 $ 1,388 $ 2,314 $ 10,822 $ 12,951 $ 318 $ 39,532 Nonaccrual loans — 35 — — 40 247 102 — 424 Accruing loans contractually past due 90 days or more — — — — — — 1 — 1 Total commercial $ 4,656 $ 3,868 $ 3,250 $ 1,388 $ 2,354 $ 11,069 $ 13,054 $ 318 $ 39,957 Credit risk profile Commercial loans are assigned a credit rating based on the estimated probability of default. Investment grade includes loans with credit ratings of at least BBB- or above or the equivalent based on our internal credit rating system. The following table summarizes the credit risk profile of our commercial loan portfolio, including a disaggregation of the loans by year of origination as of September 30, 2024 and December 31, 2023: 2024 2023 2022 2021 2020 Prior Revolving Revolving Loans Converted to Term Loans Total at Sep. 30, 2024 (in millions) Real estate, including construction: Investment grade $ 66 $ 323 $ 26 $ — $ 166 $ 593 $ — $ — $ 1,174 Non-investment grade 572 716 1,191 883 96 2,122 38 3 5,621 Total real estate, including construction 638 1,039 1,217 883 262 2,715 38 3 6,795 Business and corporate banking: Investment grade 662 507 351 590 86 1,842 3,018 89 7,145 Non-investment grade 747 849 767 671 90 2,254 3,678 219 9,275 Total business and corporate banking 1,409 1,356 1,118 1,261 176 4,096 6,696 308 16,420 Global banking: Investment grade 811 1,448 751 558 96 3,714 1,438 — 8,816 Non-investment grade 124 320 98 102 20 781 312 — 1,757 Total global banking 935 1,768 849 660 116 4,495 1,750 — 10,573 Other commercial: Investment grade 171 95 136 30 357 845 4,469 — 6,103 Non-investment grade 100 49 126 294 129 300 226 — 1,224 Total other commercial 271 144 262 324 486 1,145 4,695 — 7,327 Total commercial $ 3,253 $ 4,307 $ 3,446 $ 3,128 $ 1,040 $ 12,451 $ 13,179 $ 311 $ 41,115 Total commercial: Investment grade $ 1,710 $ 2,373 $ 1,264 $ 1,178 $ 705 $ 6,994 $ 8,925 $ 89 $ 23,238 Non-investment grade 1,543 1,934 2,182 1,950 335 5,457 4,254 222 17,877 Total commercial $ 3,253 $ 4,307 $ 3,446 $ 3,128 $ 1,040 $ 12,451 $ 13,179 $ 311 $ 41,115 2023 2022 2021 2020 2019 Prior Revolving Revolving Loans Converted to Term Loans Total at Dec. 31, 2023 (in millions) Real estate, including construction: Investment grade $ 327 $ 100 $ 24 $ 187 $ 162 $ 939 $ 1 $ — $ 1,740 Non-investment grade 593 1,186 995 168 892 1,470 40 3 5,347 Total real estate, including construction 920 1,286 1,019 355 1,054 2,409 41 3 7,087 Business and corporate banking: Investment grade 732 304 543 95 261 1,977 3,311 54 7,277 Non-investment grade 538 844 531 136 300 2,276 3,611 211 8,447 Total business and corporate banking 1,270 1,148 1,074 231 561 4,253 6,922 265 15,724 Global banking: Investment grade 1,947 1,109 651 149 307 2,842 2,140 — 9,145 Non-investment grade 308 44 193 2 14 758 211 50 1,580 Total global banking 2,255 1,153 844 151 321 3,600 2,351 50 10,725 Other commercial: Investment grade 211 192 43 376 298 564 3,143 — 4,827 Non-investment grade — 89 270 275 120 243 597 — 1,594 Total other commercial 211 281 313 651 418 807 3,740 — 6,421 Total commercial $ 4,656 $ 3,868 $ 3,250 $ 1,388 $ 2,354 $ 11,069 $ 13,054 $ 318 $ 39,957 Total commercial: Investment grade $ 3,217 $ 1,705 $ 1,261 $ 807 $ 1,028 $ 6,322 $ 8,595 $ 54 $ 22,989 Non-investment grade 1,439 2,163 1,989 581 1,326 4,747 4,459 264 16,968 Total commercial $ 4,656 $ 3,868 $ 3,250 $ 1,388 $ 2,354 $ 11,069 $ 13,054 $ 318 $ 39,957 Gross Charge-offs The following table summarizes gross charge-off dollars in our commercial loan portfolio, disaggregated by year of origination, during the nine months ended September 30, 2024 and 2023: 2024 2023 2022 2021 2020 Prior Revolving Revolving Loans Converted to Term Loans Total (in millions) Nine Months Ended September 30, 2024 Business and corporate banking $ — $ — $ — $ 32 $ — $ 21 $ 1 $ — $ 54 Global banking — — — — — 3 — — 3 Total commercial $ — $ — $ — $ 32 $ — $ 24 $ 1 $ — $ 57 2023 2022 2021 2020 2019 Prior Revolving Revolving Loans Converted to Term Loans Total (in millions) Nine Months Ended September 30, 2023 Business and corporate banking $ — $ — $ 17 $ — $ — $ 9 $ 14 $ — $ 40 Total commercial $ — $ — $ 17 $ — $ — $ 9 $ 14 $ — $ 40 Consumer Loan Credit Quality Indicators and Gross Charge-offs by Year of Origination The following credit quality indicators are utilized to monitor our consumer loan portfolio: Delinquency The following table summarizes dollars of two-months-and-over contractual delinquency for our consumer loan portfolio, including a disaggregation of the loans by year of origination as of September 30, 2024 and December 31, 2023: 2024 2023 2022 2021 2020 Prior Revolving Total at Sep. 30, 2024 (in millions) Residential mortgages (1)(2) $ — $ 1 $ 9 $ 4 $ 9 $ 104 $ — $ 127 Home equity mortgages (1)(2) — — — — — 5 — 5 Credit cards — — — — — — 4 4 Other consumer — — — — 1 2 — 3 Total consumer $ — $ 1 $ 9 $ 4 $ 10 $ 111 $ 4 $ 139 2023 2022 2021 2020 2019 Prior Revolving Total at Dec. 31, 2023 (in millions) Residential mortgages (1)(2) $ — $ 2 $ 6 $ 6 $ 1 $ 100 $ — $ 115 Home equity mortgages (1)(2) — — — — — 4 — 4 Credit cards — — — — — — 4 4 Other consumer — — — — — 2 — 2 Total consumer $ — $ 2 $ 6 $ 6 $ 1 $ 106 $ 4 $ 125 (1) At September 30, 2024 and December 31, 2023, consumer mortgage loan delinquency includes $69 million and $61 million, respectively, of loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell. (2) At September 30, 2024 and December 31, 2023, consumer mortgage loans include $33 million and $21 million, respectively, of loans that were in the process of foreclosure. Nonperforming The following table summarizes the nonperforming status of our consumer loan portfolio, including a disaggregation of the loans by year of origination as of September 30, 2024 and December 31, 2023: 2024 2023 2022 2021 2020 Prior Revolving Total at Sep. 30, 2024 (in millions) Residential mortgages: Performing loans $ 2,996 $ 2,443 $ 2,653 $ 3,958 $ 2,639 $ 5,384 $ — $ 20,073 Nonaccrual loans — — 7 7 10 138 — 162 Total residential mortgages 2,996 2,443 2,660 3,965 2,649 5,522 — 20,235 Home equity mortgages: Performing loans 38 80 67 9 18 175 — 387 Nonaccrual loans — — — — — 6 — 6 Total home equity mortgages 38 80 67 9 18 181 — 393 Credit cards: Performing loans — — — — — — 183 183 Accruing loans contractually past due 90 days or more — — — — — — 2 2 Total credit cards — — — — — — 185 185 Other consumer: Performing loans — — 4 10 5 60 5 84 Accruing loans contractually past due 90 days or more — — — — — 2 — 2 Total other consumer — — 4 10 5 62 5 86 Total consumer $ 3,034 $ 2,523 $ 2,731 $ 3,984 $ 2,672 $ 5,765 $ 190 $ 20,899 Total consumer: Performing loans $ 3,034 $ 2,523 $ 2,724 $ 3,977 $ 2,662 $ 5,619 $ 188 $ 20,727 Nonaccrual loans — — 7 7 10 144 — 168 Accruing loans contractually past due 90 days or more — — — — — 2 2 4 Total consumer $ 3,034 $ 2,523 $ 2,731 $ 3,984 $ 2,672 $ 5,765 $ 190 $ 20,899 2023 2022 2021 2020 2019 Prior Revolving Total at Dec. 31, 2023 (in millions) Residential mortgages: Performing loans $ 2,646 $ 2,753 $ 4,096 $ 2,761 $ 1,236 $ 4,677 $ — $ 18,169 Nonaccrual loans — 11 11 9 8 133 — 172 Total residential mortgages 2,646 2,764 4,107 2,770 1,244 4,810 — 18,341 Home equity mortgages: Performing loans 80 69 11 22 25 176 — 383 Nonaccrual loans — — — — — 6 — 6 Total home equity mortgages 80 69 11 22 25 182 — 389 Credit cards: Performing loans — — — — — — 196 196 Accruing loans contractually past due 90 days or more — — — — — — 3 3 Total credit cards — — — — — — 199 199 Other consumer: Performing loans — 8 7 7 3 67 7 99 Accruing loans contractually past due 90 days or more — — — — — 2 — 2 Total other consumer — 8 7 7 3 69 7 101 Total consumer $ 2,726 $ 2,841 $ 4,125 $ 2,799 $ 1,272 $ 5,061 $ 206 $ 19,030 Total consumer: Performing loans $ 2,726 $ 2,830 $ 4,114 $ 2,790 $ 1,264 $ 4,920 $ 203 $ 18,847 Nonaccrual loans — 11 11 9 8 139 — 178 Accruing loans contractually past due 90 days or more — — — — — 2 3 5 Total consumer $ 2,726 $ 2,841 $ 4,125 $ 2,799 $ 1,272 $ 5,061 $ 206 $ 19,030 Gross Charge-offs The following table summarizes gross charge-off dollars in our consumer loan portfolio, disaggregated by year of origination, during the nine months ended September 30, 2024 and 2023: 2024 2023 2022 2021 2020 Prior Revolving Total (in millions) Nine Months Ended September 30, 2024 Credit cards $ — $ — $ — $ — $ — $ — $ 6 $ 6 Other consumer — — — — — 1 — 1 Total consumer $ — $ — $ — $ — $ — $ 1 $ 6 $ 7 2023 2022 2021 2020 2019 Prior Revolving Total (in millions) Nine Months Ended September 30, 2023 Residential mortgages $ — $ — $ — $ — $ — $ 4 $ — $ 4 Home equity mortgages — — — — — 1 — 1 Credit cards — — — — — — 6 6 Other consumer — — — — — 1 — 1 Total consumer $ — $ — $ — $ — $ — $ 6 $ 6 $ 12 Concentration of Credit Risk At September 30, 2024 and December 31, 2023, our loan portfolios included interest-only residential mortgage and home equity mortgage loans totaling $4,564 million and $4,392 million, respectively. An interest-only residential mortgage loan allows a customer to pay the interest-only portion of the monthly payment for a period of time which results in lower payments during the initial loan period. However, subsequent events affecting a customer's financial position could affect the ability of customers to repay the loan in the future when the principal payments are required which increases the credit risk of this loan type.

Allowance for Credit Losses

Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2024
Credit Loss [Abstract]
Allowance for Credit Losses	Allowance for Credit Losses We utilize a minimum of four forward-looking economic scenarios to calculate lifetime ECL when estimating the allowance for credit losses for in scope financial assets and the liability for off-balance sheet credit exposures. Three of the scenarios are termed the "Consensus Economic Scenarios" which include a 'most likely outcome' (the "Central scenario") and two less likely 'outer' scenarios, referred to as the "Upside scenario" and the "Downside scenario." The fourth scenario, referred to as the "Alternative Downside scenario," is designed to consider severe downside risks with more extreme economic outcomes. Each scenario is assigned a weighting deemed appropriate for the estimation of lifetime ECL, with the majority of the weighting typically placed on the Central scenario. At management's discretion, changes may be made to the weighting assigned to the four scenarios or additional scenarios may be included in order to consider current economic conditions. Updates to Economic Scenarios and Other Changes During the Nine Months Ended September 30, 2024 During the first half of 2024, economic uncertainty remained due to elevated interest rates and inflation levels. We updated our Consensus Economic Scenarios and our Alternative Downside scenario to reflect management's view of forecasted economic conditions and utilized the four updated scenarios for estimating lifetime ECL at June 30, 2024. Each of the four scenarios were assigned weightings with the majority of the weighting placed on the Central scenario, lower equal weights placed on the Upside and Downside scenarios and the lowest weighting placed on the Alternative Downside scenario. This weighting was deemed appropriate for the estimation of lifetime ECL at that time. During the third quarter of 2024, elevated interest rates and the effects from higher inflation continued to create economic uncertainty. We updated our Consensus Economic Scenarios and our Alternative Downside scenario to reflect management's current view of forecasted economic conditions and utilized the four updated scenarios for estimating lifetime ECL at September 30, 2024. Each of the four scenarios were assigned weightings with the majority of the weighting placed on the Central scenario, lower equal weights placed on the Upside and Downside scenarios and the lowest weighting placed on the Alternative Downside scenario. This weighting was deemed appropriate for the estimation of lifetime ECL under current conditions. The following discussion summarizes the Central, Upside, Downside and Alternative Downside scenarios at September 30, 2024. The economic assumptions described in this section have been formed specifically for the purpose of calculating ECL. In the Central scenario , U.S. Gross Domestic Product ("GDP") growth moderates in 2024 and 2025 compared with 2023 under the assumption that diminishing excess household savings, a softened labor market, and elevated interest rates constrain expenditure. As the labor market becomes more balanced, the unemployment rate increases slightly, but remains near historic lows, while residential housing prices grow modestly driven by a low inventory of existing homes for sale. In the financial markets, growth in financial asset prices moderates compared with the first half of 2024 while the FRB continues to reduce its policy rate in the fourth quarter of 2024 followed by further reductions in 2025 as inflation falls closer to the FRB's long-run inflation target. In the Upside scenario , the economy is assumed to grow at a faster pace than in the Central scenario as inflation wanes. As a result, the unemployment rate falls and remains lower than in the Central scenario, while both residential housing and commercial real estate prices are higher than in the Central scenario. In this scenario, the equity price index climbs with strong momentum and overall optimism fueled by easing inflation allows the FRB to normalize its policy rate slightly faster than currently anticipated, which, combined with lower inflation expectations, drive the 10-year U.S. Treasury yield lower than in the Central scenario. In the Downside scenario , inflation re-accelerates and the economy enters into a mild recession, with the unemployment rate increasing and remaining at a higher level, while residential housing and commercial real estate prices undergo sharp correction due to weakness in the labor market and rising inflation. In this scenario, the FRB maintains its policy rate initially to tackle inflation and the equity price index goes through a substantial correction by the end of 2025 driven by an overall erosion of consumer and business sentiments, which eventually results in lower interest rates than in the Central scenario. In the Alternative Downside scenario , geopolitical tensions escalate significantly and more severe inflationary pressures accompanied by tighter monetary policy lead the U.S. economy into a deep recession in 2025, followed by a very anemic recovery starting in 2026. An extended period of economic contraction keeps the unemployment rate at an elevated level, which pressures residential housing prices to depreciate substantially, while at the same time, contracting corporate activities and rising unemployment pushes the commercial real estate market into a downturn. In this scenario, financial markets experience a major sell-off and volatility in the financial markets remains extremely high over the next year, widening corporate credit spreads substantially, and flight to safe haven assets pushes the 10-year U.S. Treasury yield lower. The following table presents the forecasted key macroeconomic variables in our Central scenarios used for estimating lifetime ECL at September 30, 2024, June 30, 2024 and December 31, 2023: For the Quarter Ended December 31, 2024 June 30, 2025 December 31, 2025 Unemployment rate (quarterly average): Forecast at September 30, 2024 4.3 % 4.4 % 4.3 % Forecast at June 30, 2024 4.1 4.1 4.1 Forecast at December 31, 2023 4.3 4.2 4.1 GDP growth rate (year-over-year): Forecast at September 30, 2024 1.6 1.4 2.0 Forecast at June 30, 2024 1.8 1.7 1.7 Forecast at December 31, 2023 1.1 1.8 2.1 As part of our updates to the economic scenarios, during the three and nine months ended September 30, 2024, we also decreased our commercial allowance for credit losses for risk associated with large loan exposures. In addition to the updates to the economic scenarios, during the three and nine months ended September 30, 2024, we decreased the management judgement allowance on our commercial loan portfolio for risk factors associated with higher risk industry exposures that are not fully captured in the models, while in the year-to-date period, we increased the management judgement allowance on our commercial loan portfolio for risk factors associated with innovation banking exposures that are not fully captured in the models. While we believe that the assumptions used in our credit loss models are reasonable within the parameters for which the models have been built and calibrated to operate, inflation and elevated interest rates have resulted in a macroeconomic environment that is outside the parameters for which the models have been built. As a result, adjustments to model outputs to reflect consideration of management judgment are used with stringent governance in place to ensure an appropriate lifetime ECL estimate. The impacts of elevated interest rates and the effects from higher inflation will continue to impact our business and our allowance for credit losses in future periods, the extent of which remains uncertain. We will continue to monitor these situations closely and will continue to adapt our approach as necessary to reflect management's current view of forecasted economic conditions. Allowance for Credit Losses / Liability for Off-Balance Sheet Credit Exposures The following table summarizes our allowance for credit losses and the liability for off-balance sheet credit exposures: September 30, 2024 December 31, 2023 (in millions) Allowance for credit losses: Loans $ 547 $ 591 Securities held-to-maturity (1) — — Other financial assets measured at amortized cost (2) — — Securities available-for-sale (1) — — Total allowance for credit losses $ 547 $ 591 Liability for off-balance sheet credit exposures $ 135 $ 111 (1) See Note 3, "Securities," for additional information regarding the allowance for credit losses associated with our security portfolios. (2) Primarily includes accrued interest receivables and customer acceptances. The following table summarizes the changes in the allowance for credit losses on loans by product or line of business during the three and nine months ended September 30, 2024 and 2023: Commercial Loans Consumer Loans Real Estate, including Construction Business Global Other Residential Home Credit Other Total Loans (in millions) Three Months Ended September 30, 2024 Allowance for credit losses – beginning of period $ 145 $ 300 $ 121 $ 1 $ (7) $ 7 $ 13 $ 3 $ 583 Provision charged (credited) to income 17 (33) (15) — (2) 1 1 1 (30) Charge-offs — (5) — — — — (2) (1) (8) Recoveries — — — — 1 — 1 — 2 Net (charge-offs) recoveries — (5) — — 1 — (1) (1) (6) Allowance for credit losses – end of period $ 162 $ 262 $ 106 $ 1 $ (8) $ 8 $ 13 $ 3 $ 547 Three Months Ended September 30, 2023 Allowance for credit losses – beginning of period $ 146 $ 295 $ 151 $ 1 $ (13) $ 7 $ 15 $ 3 $ 605 Provision charged (credited) to income (3) 24 (21) — 2 (1) 2 (1) 2 Charge-offs — (34) — — — — (2) — (36) Recoveries — 3 — — — 1 1 — 5 Net (charge-offs) recoveries — (31) — — — 1 (1) — (31) Allowance for credit losses – end of period $ 143 $ 288 $ 130 $ 1 $ (11) $ 7 $ 16 $ 2 $ 576 Nine Months Ended September 30, 2024 Allowance for credit losses – beginning of period $ 144 $ 302 $ 127 $ 1 $ (9) $ 7 $ 16 $ 3 $ 591 Provision charged (credited) to income 18 13 (18) — (2) — — 1 12 Charge-offs — (54) (3) — — — (6) (1) (64) Recoveries — 1 — — 3 1 3 — 8 Net (charge-offs) recoveries — (53) (3) — 3 1 (3) (1) (56) Allowance for credit losses – end of period $ 162 $ 262 $ 106 $ 1 $ (8) $ 8 $ 13 $ 3 $ 547 Nine Months Ended September 30, 2023 Allowance for credit losses – beginning of period $ 200 $ 230 $ 120 $ 1 $ 11 $ 2 $ 16 $ 4 $ 584 Provision charged (credited) to income (57) 93 10 — (20) 4 3 (1) 32 Charge-offs — (40) — — (4) (1) (6) (1) (52) Recoveries — 5 — — 2 2 3 — 12 Net (charge-offs) recoveries — (35) — — (2) 1 (3) (1) (40) Allowance for credit losses – end of period $ 143 $ 288 $ 130 $ 1 $ (11) $ 7 $ 16 $ 2 $ 576 The following table summarizes the changes in the liability for off-balance sheet credit exposures during the three and nine months ended September 30, 2024 and 2023: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 (in millions) Balance at beginning of period $ 118 $ 143 $ 111 $ 117 Provision charged (credited) to income 17 (10) 24 16 Balance at end of period $ 135 $ 133 $ 135 $ 133 Accrued Interest Receivables The following table summarizes accrued interest receivables associated with financial assets carried at amortized cost and securities available-for-sale along with the related allowance for credit losses, which are reported net in other assets on the consolidated balance sheet. These accrued interest receivables are excluded from the amortized cost basis disclosures presented elsewhere in these financial statements, including Note 3, "Securities," and Note 4, "Loans." September 30, 2024 December 31, 2023 (in millions) Accrued interest receivables: Loans $ 253 $ 259 Securities held-to-maturity 67 57 Other financial assets measured at amortized cost 49 19 Securities available-for-sale 112 87 Total accrued interest receivables 481 422 Allowance for credit losses — — Accrued interest receivables, net $ 481 $ 422 During the three and nine months ended September 30, 2024, we charged-off accrued interest receivables by reversing interest income for loans of $1 million and $2 million, respectively, compared with $6 million and $10 million during the three and nine months ended September 30, 2023, respectively.

Loans Held for Sale

Loans Held for Sale	9 Months Ended
	Sep. 30, 2024
Receivables [Abstract]
Loans Held for Sale	Loans Held for Sale Loans held for sale consisted of the following: September 30, 2024 December 31, 2023 (in millions) Commercial loans: Real estate, including construction $ 40 $ — Business and corporate banking 12 — Global banking 690 339 Total commercial 742 339 Consumer loans: Residential mortgages 2 — Total consumer 2 — Total loans held for sale $ 744 $ 339 Commercial Loans Included in commercial loans held for sale are certain loans that we have elected to designate under the fair value option which consists of loans that we originate in connection with our participation in a number of syndicated credit facilities with the intent of selling them to unaffiliated third parties as well as loans that we purchase from the secondary market and hold as hedges against our exposure to certain total return swaps or intend to sell. The fair value of these loans totaled $673 million and $250 million at September 30, 2024 and December 31, 2023, respectively. See Note 9, "Fair Value Option," for additional information. Commercial loans held for sale also includes certain loans that we no longer intend to hold for investment and were transferred to held for sale which totaled $69 million and $89 million at September 30, 2024 and December 31, 2023, respectively. During the three and nine months ended September 30, 2024 and 2023, lower of amortized cost or fair value adjustments on these commercial loans held for sale were immaterial. In addition, during the second quarter of 2023, we transferred certain commercial real estate loans to held for sale with a carrying value of $507 million as part of an effort to reduce exposure to this sector. We recorded a lower of amortized cost or fair value adjustment of $34 million upon transferring these loans to held for sale as a component of other income (loss) in the consolidated statement of income. During the third quarter of 2023, a portion of these loans with a carrying value of $58 million was transferred back to held for investment and, as a result, we reversed $4 million of the lower of amortized cost or fair value adjustment previously recorded on these loans held for sale. Consumer Loans Included in residential mortgage loans held for sale are agency-eligible conforming residential mortgage loans which are originated and held for sale to third parties, currently on a servicing retained basis. Gains and losses from the sale of these residential mortgage loans are reflected as a component of other income (loss) in the consolidated statement of income. Loans held for sale are subject to market risk, liquidity risk and interest rate risk, in that their value will fluctuate as a result of changes in market conditions, as well as the credit environment. Interest rate risk for residential mortgage loans which are originated and held for sale is partially mitigated through an economic hedging program to offset changes in the fair value of these mortgage loans held for sale, from the time of commitment to sale, attributable to changes in market interest rates. Revenue associated with this economic hedging program, which is reflected as a component of other income (loss) in the consolidated statement of income, was nil during the three and nine months ended September 30, 2024 and 2023. Valuation Allowances Excluding the loans designated under the fair value option discussed above, loans held for sale are recorded at the lower of amortized cost or fair value, with adjustments to fair value being recorded as a valuation allowance through other revenues. The valuation allowance on commercial loans held for sale was nil and $2 million at September 30, 2024 and December 31, 2023, respectively. The valuation allowance on consumer loans held for sale was nil at both September 30, 2024 and December 31, 2023.

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill Goodwill was $458 million at both September 30, 2024 and December 31, 2023. Goodwill for these periods reflects accumulated impairment losses of $1,819 million, which were recognized in prior periods. During the third quarter of 2024, there were no events or changes in circumstances to indicate that it is more likely than not the fair value of our Commercial Banking reporting unit has been reduced below its carrying amount.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments In the normal course of business, the derivative instruments we enter into are for trading, market making and risk management purposes. For financial reporting purposes, derivative instruments are designated in one of the following categories: (a) hedging instruments designated as qualifying hedges under derivative and hedge accounting principles, (b) financial instruments held for trading or (c) non-qualifying economic hedges. The derivative instruments held are predominantly swaps, futures, options and forward contracts. All derivatives are stated at fair value. Where we enter into enforceable master netting agreements with counterparties, the master netting agreements permit us to net those derivative asset and liability positions and to offset cash collateral held and posted with the same counterparty. The following table presents the fair value of derivative contracts by major product type on a gross basis. Gross fair values exclude the effects of both counterparty netting as well as collateral, and therefore are not representative of our exposure. The table below also presents the amounts of counterparty netting and cash collateral that have been offset in the consolidated balance sheet, as well as cash and securities collateral posted and received under enforceable master netting agreements that do not meet the criteria for netting. Derivative assets and liabilities which are not subject to an enforceable master netting agreement, or are subject to a netting agreement where an appropriate legal opinion to determine such agreements are enforceable has not been either sought or obtained, have not been netted in the following table. Where we have received or posted collateral under netting agreements where an appropriate legal opinion to determine such agreements are enforceable has not been either sought or obtained, the related collateral also has not been netted in the following table. September 30, 2024 December 31, 2023 Derivative Assets Derivative Liabilities Derivative Assets Derivative Liabilities (in millions) Derivatives accounted for as fair value hedges: (1) Interest rate contracts - bilateral OTC (2) $ 2 $ 2 $ — $ 83 Derivatives accounted for as cash flow hedges: (1) Foreign exchange contracts - bilateral OTC (2) 4 62 — 56 Interest rate contracts - bilateral OTC (2) — 2 — 1 Total derivatives accounted for as hedges 6 66 — 140 Trading derivatives not accounted for as hedges: (3) Exchange-traded (2) 7 1 7 16 OTC-cleared (2) 101 — 70 — Bilateral OTC (2) 797 691 1,178 946 Interest rate contracts 905 692 1,255 962 OTC-cleared (2) 86 — — — Bilateral OTC (2) 9,483 9,623 13,606 13,479 Foreign exchange contracts 9,569 9,623 13,606 13,479 Exchange-traded (2) 5 — 7 — Bilateral OTC (2) 390 1,148 413 1,080 Equity contracts 395 1,148 420 1,080 Exchange-traded (2) — — 3 — Bilateral OTC (2) 1,288 1,271 1,150 1,033 Precious metals contracts 1,288 1,271 1,153 1,033 OTC-cleared (2) — — 14 — Bilateral OTC (2) 111 137 81 137 Credit contracts 111 137 95 137 Other non-qualifying derivatives not accounted for as hedges: (1) Interest rate contracts - bilateral OTC (2) — 62 — 76 Equity contracts - bilateral OTC (2) 536 116 621 193 OTC-cleared (2) — — 1 1 Bilateral OTC (2) 11 128 13 122 Credit contracts 11 128 14 123 Other contracts - bilateral OTC (2)(4) 11 56 5 40 Total derivatives 12,832 13,299 17,169 17,263 Less: Gross amounts of receivable / payable subject to enforceable master netting agreements (5)(7) 10,428 10,428 14,110 14,110 Less: Gross amounts of cash collateral received / posted subject to enforceable master netting agreements (6)(7) 1,170 1,511 1,760 1,321 Net amounts of derivative assets / liabilities presented in the balance sheet 1,234 1,360 1,299 1,832 Less: Gross amounts of financial instrument collateral received / posted subject to enforceable master netting agreements but not offset in the consolidated balance sheet 151 36 63 273 Net amounts of derivative assets / liabilities $ 1,083 $ 1,324 $ 1,236 $ 1,559 (1) Derivative assets / liabilities related to cash flow hedges, fair value hedges and derivative instruments held for purposes other than for trading are recorded in other assets other liabilities (2) Over-the-counter ("OTC") derivatives include derivatives executed and settled bilaterally with counterparties without the use of an organized exchange or central clearing house. The credit risk associated with bilateral OTC derivatives is managed through obtaining collateral and enforceable master netting agreements. OTC-cleared derivatives are executed bilaterally in the OTC market but then novated to a central clearing counterparty, whereby the central clearing counterparty becomes the counterparty to each of the original counterparties. Exchange traded derivatives are executed directly on an organized exchange. Credit risk is minimized for OTC-cleared derivatives and exchange traded derivatives through daily margining requirements. In addition, OTC-cleared interest rate and credit derivatives with certain central clearing counterparties are settled daily. (3) Trading related derivative assets / liabilities are recorded in trading assets / trading liabilities on the consolidated balance sheet. (4) Consists of swap agreements entered into in conjunction with the sales of Visa Inc. ("Visa") Class B common shares ("Class B Shares"). (5) Represents the netting of derivative receivable and payable balances for the same counterparty under enforceable netting agreements. (6) Represents the netting of cash collateral posted and received by counterparty under enforceable netting agreements. (7) Netting is performed at a counterparty level in cases where enforceable master netting agreements are in place, regardless of the type of derivative instrument. Therefore, we have not allocated netting to the different types of derivative instruments shown in the table above. See Note 16, "Guarantee Arrangements, Pledged Assets and Repurchase Agreements," for further information on offsetting related to resale and repurchase agreements. Derivatives Held for Risk Management Purposes Our risk management policy requires us to identify, analyze and manage risks arising from the activities conducted during the normal course of business. We use derivative instruments as an asset and liability management tool to manage our exposures in interest rate, foreign currency and credit risks in existing assets and liabilities, commitments and forecasted transactions. The accounting for changes in fair value of a derivative instrument will depend on whether the derivative has been designated and qualifies for hedge accounting. We designate derivative instruments to offset the fair value risk and cash flow risk arising from fixed-rate and floating-rate assets and liabilities as well as forecasted transactions. We assess the hedging relationships, both at the inception of the hedge and on an ongoing basis, using a regression approach to determine whether the designated hedging instrument is highly effective in offsetting changes in the fair value or the cash flows attributable to the hedged risk. Accounting principles for qualifying hedges require us to prepare detailed documentation describing the relationship between the hedging instrument and the hedged item, including, but not limited to, the risk management objective, the hedging strategy and the methods to assess and measure the ineffectiveness of the hedging relationship. We discontinue hedge accounting when we determine that the hedge is no longer highly effective, the hedging instrument is terminated, sold or expired, the designated forecasted transaction is not probable of occurring, or when the designation is removed by us. Fair Value Hedges In the normal course of business, we hold fixed-rate loans and securities, and issue fixed-rate deposits and senior and subordinated debt obligations. The fair value of fixed-rate assets and liabilities fluctuates in response to changes in interest rates. We utilize interest rate swaps, forward and futures contracts to minimize our exposure to changes in fair value caused by interest rate volatility. The changes in the fair value of the hedged item designated in a qualifying hedge are captured as an adjustment to the carrying amount of the hedged item (basis adjustment). If the hedging relationship is discontinued and the hedged item continues to exist, the basis adjustment is amortized over the remaining life of the hedged item. The following table presents the carrying amount of hedged items in fair value hedges recognized in the consolidated balance sheet at September 30, 2024 and December 31, 2023, along with the cumulative amount of fair value hedging adjustments included in the carrying amount of those hedged items: Carrying Amount of Hedged Items (1) Cumulative Amount of Fair Value Hedging Adjustments Increasing (Decreasing) the Active Discontinued Total (in millions) At September 30, 2024 Securities available-for-sale ("AFS") $ 12,958 $ (1,024) $ (41) $ (1,065) Deposits 1,483 (62) 44 (18) Long-term debt 8,320 (221) 42 (179) At December 31, 2023 Securities AFS 11,112 (1,320) (70) (1,390) Deposits 1,463 (104) 67 (37) Long-term debt 7,913 (407) 72 (335) (1) The carrying amount of securities AFS represents the amortized cost basis. The following table presents information on gains and losses on derivative instruments designated and qualifying as hedging instruments and the hedged items in fair value hedges and their location on the consolidated statement of income: Location of Gain (Loss) Gain (Loss) on Derivatives Gain (Loss) on Hedged Items (in millions) Three Months Ended September 30, 2024 Interest rate contracts / Securities AFS Net interest income $ (405) $ 617 Interest rate contracts / Deposits Net interest income 40 (53) Interest rate contracts / Long-term debt Net interest income 114 (274) Total $ (251) $ 290 Three Months Ended September 30, 2023 Interest rate contracts / Securities AFS Net interest income $ 735 $ (550) Interest rate contracts / Deposits Net interest income (15) (20) Interest rate contracts / Long-term debt Net interest income (83) (45) Total $ 637 $ (615) Nine Months Ended September 30, 2024 Interest rate contracts / Securities AFS Net interest income $ 67 $ 504 Interest rate contracts / Deposits Net interest income 9 (92) Interest rate contracts / Long-term debt Net interest income (19) (432) Total $ 57 $ (20) Nine Months Ended September 30, 2023 Interest rate contracts / Securities AFS Net interest income $ 927 $ (384) Interest rate contracts / Deposits Net interest income (42) (58) Interest rate contracts / Long-term debt Net interest income (153) (192) Total $ 732 $ (634) Cash Flow Hedges We own or issue floating rate financial instruments and enter into forecasted transactions that give rise to variability in future cash flows. As a part of our risk management strategy, we use interest rate swaps, currency swaps and futures contracts to mitigate risk associated with variability in the cash flows. Changes in fair value of a derivative instrument associated with a qualifying cash flow hedge are recognized in other comprehensive income (loss). When the cash flows being hedged materialize and are recorded in income or expense, the associated gain or loss from the hedging derivative previously recorded in accumulated other comprehensive loss ("AOCI") is reclassified into earnings in the same accounting period in which the designated forecasted transaction or hedged item affects earnings. If a cash flow hedge of a forecasted transaction is discontinued because it is no longer highly effective, or if the hedge relationship is terminated, the cumulative gain or loss on the hedging derivative to that date will continue to be reported in AOCI unless it is probable that the hedged forecasted transaction will not occur by the end of the originally specified time period as documented at the inception of the hedge, at which time the cumulative gain or loss is released into earnings. At September 30, 2024, active cash flow hedge relationships extend or mature through July 2036. During the three and nine months ended September 30, 2024, respectively, $22 million and $45 million of losses related to discontinued cash flow hedge relationships were amortized to earnings from AOCI compared with losses of $53 million and $153 million during the three and nine months ended September 30, 2023, respectively. During the next twelve months, we expect to amortize $23 million of remaining losses to earnings resulting from these discontinued cash flow hedges. The interest accrual related to the hedging instruments is recognized in net interest income The following table presents information on gains and losses on derivative instruments designated and qualifying as hedging instruments in cash flow hedges (including amounts recognized in AOCI from discontinued cash flow hedges) and their location on the consolidated statement of income: Gain (Loss) Recognized in Location of Gain (Loss) Gain (Loss) Reclassified From 2024 2023 2024 2023 (in millions) Three Months Ended September 30, Foreign exchange contracts $ 6 $ — Net interest income $ — $ — Interest rate contracts (170) 27 Net interest income (22) (53) Total $ (164) $ 27 $ (22) $ (53) Nine Months Ended September 30, Foreign exchange contracts $ 5 $ — Net interest income $ — $ — Interest rate contracts (107) (8) Net interest income (45) (153) Total $ (102) $ (8) $ (45) $ (153) Trading Derivatives and Non-Qualifying Hedging Activities In addition to risk management, we also enter into derivative contracts, including buy- and sell-protection credit derivatives, for the purposes of trading and market making, or repackaging risks to form structured trades to meet clients' risk taking objectives. Additionally, we buy or sell securities and use derivatives to mitigate the market risks arising from our trading activities with our clients that exceed our risk appetite. We also use buy-protection credit derivatives to manage our counterparty credit risk exposure. Where we enter into derivatives for trading purposes, realized and unrealized gains and losses are recognized in trading revenue. Counterparty credit risk associated with OTC derivatives, including risk-mitigating buy-protection credit derivatives, are recognized as an adjustment to the fair value of the derivatives and are recorded in trading revenue. Our non-qualifying hedging and other activities include: • Derivative contracts related to the fixed-rate long-term debt issuances and hybrid instruments, including all structured notes and deposits, for which we have elected fair value option accounting. These derivative contracts are non-qualifying hedges but are considered economic hedges. • Credit default swaps which are designated as economic hedges against the credit risks within our loan portfolio. In the event of an impairment loss occurring in a loan that is economically hedged, the impairment loss is recognized as provision for credit losses while the gain on the credit default swap is recorded as other income (loss). • Swap agreements entered into in conjunction with the sales of Visa Class B Shares to a third party to retain the litigation risk associated with the Class B Shares sold until the related litigation is settled. See Note 16, "Guarantee Arrangements, Pledged Assets and Repurchase Agreements," for additional information. • Forward purchases or sales of to-be-announced ("TBA") securities used to economically hedge changes in the fair value of residential mortgage loans which are originated and held for sale attributable to changes in market interest rates. Changes in the fair value of TBA positions, which are considered derivatives, are recorded in other income (loss). See Note 6, "Loans Held for Sale," for additional information. • Equity warrant assets obtained in connection with certain commercial lending activities, which generally entitle us to acquire stock in private companies. Changes in fair value are recorded in other income (loss). Derivative instruments designated as economic hedges that do not qualify for hedge accounting are recorded at fair value through profit and loss. Realized and unrealized gains and losses on economic hedges are recognized in gain (loss) on instruments designated at fair value and related derivatives or other income (loss) while the derivative asset or liability positions are reflected as other assets or other liabilities. The following table presents information on gains and losses on derivative instruments held for trading purposes and their location on the consolidated statement of income: Location of Gain (Loss) Gain (Loss) Recognized in Income on Derivatives Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 (in millions) Interest rate contracts Trading revenue $ (120) $ 173 $ 8 $ 118 Foreign exchange contracts Trading revenue 85 35 226 169 Equity contracts Trading revenue (495) 522 (2,016) (651) Precious metals contracts Trading revenue (2) 84 (13) 233 Credit contracts Trading revenue (115) 170 11 191 Total $ (647) $ 984 $ (1,784) $ 60 The following table presents information on gains and losses on derivative instruments held for non-qualifying hedging and other activities and their location on the consolidated statement of income: Location of Gain (Loss) Gain (Loss) Recognized in Income on Derivatives Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 (in millions) Interest rate contracts Gain (loss) on instruments designated at fair value and related derivatives $ 69 $ (100) $ (4) $ (110) Equity contracts Gain (loss) on instruments designated at fair value and related derivatives 186 (188) 321 518 Equity contracts Other income (loss) 4 — 4 — Credit contracts Other income (loss) (14) (17) (45) (42) Other contracts (1) Other income (loss) (31) (31) (33) (40) Total $ 214 $ (336) $ 243 $ 326 (1) Consists of swap agreements entered into in conjunction with the sales of Visa Class B Shares. Credit-Risk Related Contingent Features The majority of our derivative contracts contain provisions that require us to maintain a specific credit rating from each of the major credit rating agencies. Sometimes the derivative instrument transactions are a part of broader structured product transactions. If our credit ratings were to fall below the current ratings, the counterparties to our derivative instruments could demand us to post additional collateral. The amount of additional collateral required to be posted will depend on whether we are downgraded by one or more notches. The aggregate fair value of all derivative instruments with credit-risk related contingent features that were in a net liability position at September 30, 2024 was $110 million, for which we had posted collateral of $54 million. The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a net liability position at December 31, 2023 was $169 million, for which we had posted collateral of $90 million. Substantially all of the collateral posted is in the form of cash or securities available-for-sale. See Note 16, "Guarantee Arrangements, Pledged Assets and Repurchase Agreements," for further details. The following table presents the amount of additional collateral that we would be required to post (from the current collateral level) related to derivative instruments with credit-risk related contingent features if our long-term ratings were downgraded by one or two notches. A downgrade by a single rating agency that does not result in a rating lower than a preexisting corresponding rating provided by another rating agency will generally not result in additional collateral. One-notch downgrade Two-notch downgrade (in millions) Amount of additional collateral to be posted upon downgrade $ — $ 36 Notional Value of Derivative Contracts The following table summarizes the notional values of derivative contracts: September 30, 2024 December 31, 2023 (in millions) Interest rate: Futures and forwards $ 28,547 $ 5,143 Swaps 99,232 114,947 Options written 1,054 1,260 Options purchased 1,461 1,352 Total interest rate 130,294 122,702 Foreign exchange: Swaps, futures and forwards 1,040,911 1,005,683 Options written 39,030 30,755 Options purchased 39,115 30,898 Spot 58,328 29,631 Total foreign exchange 1,177,384 1,096,967 Commodities, equities and precious metals: Swaps, futures and forwards 32,824 53,110 Options written 1,570 1,713 Options purchased 8,915 8,464 Total commodities, equities and precious metals 43,309 63,287 Credit derivatives 19,021 16,710 Other contracts (1) 1,452 1,416 Total $ 1,371,460 $ 1,301,082 (1) Consists of swap agreements entered into in conjunction with the sales of Visa Class B Shares.

Fair Value Option

Fair Value Option	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value Option	Fair Value Option We report our results to HSBC in accordance with HSBC Group accounting and reporting policies ("Group Reporting Basis"), which apply International Financial Reporting Standards ("IFRSs") as issued by the International Accounting Standards Board ("IASB"). We typically have elected to apply fair value option ("FVO") accounting to selected financial instruments to align the measurement attributes of those instruments under U.S. GAAP and the Group Reporting Basis and to simplify the accounting model applied to those financial instruments. We elected to apply FVO accounting to certain commercial loans held for sale, certain student loans held for investment, certain fixed-rate long-term debt issuances, all of our hybrid instruments, including structured notes and deposits, and certain client share repurchase transactions. Excluding the fair value movement on fair value option liabilities attributable to our own credit spread, which is recorded in other comprehensive income (loss), changes in the fair value of fair value option assets and liabilities as well as the mark-to-market adjustment on the related derivatives and the net realized gains or losses on these derivatives are reported in gain (loss) on instruments designated at fair value and related derivatives in the consolidated statement of income. Loans and Loans Held For Sale We elected to apply FVO accounting to certain commercial syndicated loans which are originated with the intent to sell and certain commercial loans that we purchased from the secondary market and hold as hedges against our exposure to certain total return swaps or intend to sell and include these loans as loans held for sale in the consolidated balance sheet. We also elected to apply FVO accounting to certain student loans held for investment. These elections allow us to account for these loans at fair value which is consistent with the manner in which the instruments are managed. Where available, fair value is based on observable market pricing obtained from independent sources, relevant broker quotes or observed market prices of instruments with similar characteristics. Where observable market parameters are not available, fair value is determined based on contractual cash flows adjusted for estimates of prepayment rates, expected default rates and loss severity discounted at management's estimate of the expected rate of return required by market participants. We also consider loan-specific risk mitigating factors such as collateral arrangements in determining the fair value estimate. Interest from these loans is recorded as interest income in the consolidated statement of income. Because a substantial majority of the loans elected for the fair value option are floating-rate commercial loans, changes in their fair value are primarily attributable to changes in loan-specific credit risk factors. The components of gain (loss) related to loans designated at fair value are summarized in the table below. At September 30, 2024 and December 31, 2023, no loans for which the fair value option has been elected were 90 days or more past due or in nonaccrual status. Long-Term Debt (Own Debt Issuances) We elected to apply FVO accounting for certain fixed-rate long-term debt for which we had applied or otherwise would elect to apply fair value hedge accounting. The election allows us to achieve a similar accounting effect without having to meet the hedge accounting requirements. The own debt issuances elected under FVO are traded in secondary markets and, as such, the fair value is determined based on observed prices for the specific instruments. The observed market price of these instruments reflects the effect of changes to our own credit spreads and interest rates. Interest on the fixed-rate debt accounted for under FVO is recorded as interest expense in the consolidated statement of income. Excluding the fair value movement attributable to our own credit spread, the components of gain (loss) in the consolidated statement of income related to long-term debt designated at fair value are summarized in the table below. Hybrid Instruments We elected to apply FVO accounting to all of our hybrid instruments issued, including structured notes and deposits. The valuation of the hybrid instruments is predominantly driven by the derivative features embedded within the instruments and our own credit risk. Cash flows of the hybrid instruments in their entirety, including the embedded derivatives, are discounted at an appropriate rate for the applicable duration of the instrument adjusted for our own credit spreads. The credit spreads applied to structured notes are determined with reference to our own debt issuance rates observed in the primary and secondary markets, internal funding rates, and structured note rates in recent executions while the credit spreads applied to structured deposits are determined using market rates currently offered on comparable deposits with similar characteristics and maturities. Interest on this debt is recorded as interest expense in the consolidated statement of income. Excluding the fair value movement attributable to our own credit spread, the components of gain (loss) in the consolidated statement of income related to hybrid instruments designated at fair value are summarized in the table below. Client Share Repurchase Transactions From time to time, we enter into agreements with clients to facilitate share repurchase transactions under which the clients make a substantial up-front cash payment in exchange for the delivery of shares. Simultaneously, we enter into corresponding agreements with HSBC Bank plc to execute the share repurchases. We elected to apply FVO accounting to these transactions, which are recorded in other assets and interest, taxes and other liabilities on the consolidated balance sheet. The following table summarizes the fair value and unpaid principal balance for items we account for under FVO: Fair Value Unpaid Principal Balance Fair Value Over (Under) Unpaid Principal Balance (in millions) At September 30, 2024 Student loans held for investment $ 12 $ 14 $ (2) Commercial loans held for sale 673 680 (7) Fixed rate long-term debt 785 741 44 Hybrid instruments: Structured deposits 2,594 2,497 97 Structured notes 6,360 6,056 304 At December 31, 2023 Student loans held for investment $ 15 $ 17 $ (2) Commercial loans held for sale 250 256 (6) Client share repurchase asset 10 10 — Fixed rate long-term debt 749 741 8 Hybrid instruments: Structured deposits 1,821 1,816 5 Structured notes 6,790 6,418 372 Client share repurchase liability 10 10 — Components of Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives The following table summarizes the components of gain (loss) on instruments designated at fair value and related derivatives reflected in the consolidated statement of income for the three and nine months ended September 30, 2024 and 2023: Loans and Loans Held for Sale Long-Term Hybrid Total (in millions) Three Months Ended September 30, 2024 Interest rate and other components (1) $ — $ (33) $ (226) $ (259) Credit risk component (2) 1 — — 1 Total mark-to-market on financial instruments designated at fair value 1 (33) (226) (258) Mark-to-market on related derivatives — 38 218 256 Net realized gain (loss) on related long-term debt derivatives — (1) — (1) Gain (loss) on instruments designated at fair value and related derivatives $ 1 $ 4 $ (8) $ (3) Three Months Ended September 30, 2023 Interest rate and other components (1) $ — $ 50 $ 228 $ 278 Credit risk component (2) 1 — — 1 Total mark-to-market on financial instruments designated at fair value 1 50 228 279 Mark-to-market on related derivatives — (54) (233) (287) Net realized gain (loss) on related long-term debt derivatives — (1) — (1) Gain (loss) on instruments designated at fair value and related derivatives $ 1 $ (5) $ (5) $ (9) Nine Months Ended September 30, 2024 Interest rate and other components (1) $ — $ (3) $ (347) $ (350) Credit risk component (2) — — — — Total mark-to-market on financial instruments designated at fair value — (3) (347) (350) Mark-to-market on related derivatives — 3 316 319 Net realized gain (loss) on related long-term debt derivatives — (2) — (2) Gain (loss) on instruments designated at fair value and related derivatives $ — $ (2) $ (31) $ (33) Nine Months Ended September 30, 2023 Interest rate and other components (1) $ — $ 52 $ (498) $ (446) Credit risk component (2) 9 — — 9 Total mark-to-market on financial instruments designated at fair value 9 52 (498) (437) Mark-to-market on related derivatives — (59) 467 408 Net realized gain on related long-term debt derivatives — — — — Gain (loss) on instruments designated at fair value and related derivatives $ 9 $ (7) $ (31) $ (29) (1) As it relates to hybrid instruments, interest rate and other components primarily includes interest rate and equity contract risks. (2) The fair value movement on fair value option liabilities attributable to our own credit spread is recorded in other comprehensive income (loss).

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Accumulated other comprehensive loss includes certain items that are reported directly within a separate component of equity. The following table presents changes in accumulated other comprehensive loss balances: Three Months Ended September 30, 2024 2023 (in millions) Unrealized gains (losses) on investment securities: Balance at beginning of period $ (1,924) $ (2,129) Other comprehensive income (loss) for period: Net unrealized gains (losses) arising during period, net of tax of $145 million and $(113) million, respectively 438 (346) Reclassification adjustment for losses realized in net income, net of tax of $36 million and nil, respectively (1) 112 — Total other comprehensive income (loss) for period 550 (346) Balance at end of period (1,374) (2,475) Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread: Balance at beginning of period 20 85 Other comprehensive income (loss) for period: Net unrealized gains (losses) arising during period, net of tax of $1 million and $(2) million, respectively 4 (8) Total other comprehensive income (loss) for period 4 (8) Balance at end of period 24 77 Unrealized gains (losses) on derivatives designated as cash flow hedges: Balance at beginning of period (196) (347) Other comprehensive income (loss) for period: Net unrealized gains (losses) arising during period, net of tax of $(40) million and $7 million, respectively (124) 20 Reclassification adjustment for losses realized in net income, net of tax of $5 million and $13 million, respectively (2) 17 40 Total other comprehensive income (loss) for period (107) 60 Balance at end of period (303) (287) Pension and postretirement benefit liability: Balance at beginning of period 7 5 Other comprehensive income (loss) for period: Change in unfunded pension and postretirement liability, net of tax of less than $(1) million and less than $(1) million, respectively (1) (1) Total other comprehensive loss for period (1) (1) Balance at end of period 6 4 Total accumulated other comprehensive loss at end of period $ (1,647) $ (2,681) Nine Months Ended September 30, 2024 2023 (in millions) Unrealized gains (losses) on investment securities: Balance at beginning of period $ (1,734) $ (2,270) Other comprehensive income (loss) for period: Net unrealized gains (losses) arising during period, net of tax of $85 million and $(66) million, respectively 255 (203) Reclassification adjustment for (gains) losses realized in net income, net of tax of $34 million and less than $(1) million, respectively (1) 104 (2) Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity realized in net income, net of tax of less than $1 million and nil, respectively (3) 1 — Total other comprehensive income (loss) for period 360 (205) Balance at end of period (1,374) (2,475) Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread: Balance at beginning of period 61 86 Other comprehensive income (loss) for period: Net unrealized losses arising during period, net of tax of $(12) million and $(3) million, respectively (37) (9) Total other comprehensive loss for period (37) (9) Balance at end of period 24 77 Unrealized gains (losses) on derivatives designated as cash flow hedges: Balance at beginning of period (260) (396) Other comprehensive income (loss) for period: Net unrealized losses arising during period, net of tax of $(25) million and $(1) million, respectively (77) (7) Reclassification adjustment for losses realized in net income, net of tax of $11 million and $37 million, respectively (2) 34 116 Total other comprehensive income (loss) for period (43) 109 Balance at end of period (303) (287) Pension and postretirement benefit liability: Balance at beginning period 7 5 Other comprehensive income (loss) for period: Change in unfunded pension and postretirement liability, net of tax of less than $(1) million and less than $(1) million, respectively (1) (1) Total other comprehensive loss for period (1) (1) Balance at end of period 6 4 Total accumulated other comprehensive loss at end of period $ (1,647) $ (2,681) (1) Amount reclassified to net income is included in other securities gains (losses), net in our consolidated statement of income. (2) Amount reclassified to net income is included in net interest income in our consolidated statement of income. (3) Amount amortized to net income is included in interest income in our consolidated statement of income. During 2014, we transferred securities from available-for-sale to held-to-maturity. At the date of transfer, AOCI included net pretax unrealized losses related to the transferred securities which are being amortized over the remaining contractual life of each security as an adjustment of yield in a manner consistent with the amortization of any premium or discount.

Fee Income from Contracts with

Fee Income from Contracts with Customers	9 Months Ended
	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Fee Income from Contracts with Customers	Fee Income from Contracts with Customers The following table summarizes fee income from contracts with customers disaggregated by type of activity, as well as a reconciliation to total other revenues, during the three and nine months ended September 30, 2024 and 2023. See Note 23, "Fee Income from Contracts with Customers," in our 2023 Form 10-K for a description of the various types of fee-based activities and how revenue associated with these activities is recognized. There have been no significant changes in these activities since December 31, 2023. Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 (in millions) Credit card fees, net $ 14 $ 13 $ 42 $ 36 Trust and investment management fees 37 33 107 96 Other fees and commissions: Account services 80 70 231 209 Credit facilities 69 89 243 238 Other fees 8 11 29 28 Total other fees and commissions 157 170 503 475 Servicing and other fees from HSBC affiliates 99 87 280 238 Insurance (1) 1 1 3 3 Total fee income from contracts with customers 308 304 935 848 Other non-fee revenue 26 213 475 570 Total other revenues (2) $ 334 $ 517 $ 1,410 $ 1,418 (1) Included within other income (loss) in the consolidated statement of income. (2) See Note 13, "Business Segments," for a reconciliation of total other revenues on a U.S. GAAP basis to other operating income for each business segment under the Group Reporting Basis. Credit card fees, net We recognized interchange fees of $27 million and $81 million during the three and nine months ended September 30, 2024, respectively, compared with $25 million and $78 million during the three and nine months ended September 30, 2023, respectively. Credit card rewards program costs totaled $16 million and $48 million during the three and nine months ended September 30, 2024, respectively, compared with $16 million and $49 million during the three and nine months ended September 30, 2023, respectively. Deferred Fee Income Information related to deferred fee income on loan commitments, revolving credit facilities and standby letters of credit is included in Note 16, "Guarantee Arrangements, Pledged Assets and Repurchase Agreements," and Note 17, "Fair Value Measurements." Excluding these items, we had deferred fee income related to certain account service fees that are paid upfront and recognized over the service period and annual fees on credit cards which collectively was $3 million at both September 30, 2024 and December 31, 2023. We expect to recognize this revenue over a remaining period of one year or less. We do not use significant judgments in the determination of the amount and timing of fee income from contracts with customers. Additionally, costs to obtain or fulfill contracts with customers were immaterial.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2024
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions In the normal course of business, we conduct transactions with HSBC and its subsidiaries. HSBC policy requires that these transactions occur at prevailing market rates and terms and, where applicable, these transactions are compliant with United States banking regulations. All extensions of credit by (and certain credit exposures of) HSBC Bank USA to other HSBC affiliates (other than Federal Deposit Insurance Corporation insured banks) are legally required to be secured by eligible collateral. The following tables present related party balances and the income (expense) generated by related party transactions: September 30, 2024 December 31, 2023 (in millions) Assets: Cash and due from banks $ 205 $ 133 Interest bearing deposits with banks 37 90 Securities purchased under agreements to resell (1) 769 406 Trading assets 84 57 Loans 3,784 2,618 Other (2) 459 491 Total assets $ 5,338 $ 3,795 Liabilities: Deposits $ 10,167 $ 9,110 Trading liabilities 283 321 Short-term borrowings 1,342 1,014 Long-term debt 6,747 6,511 Other (2) 272 331 Total liabilities $ 18,811 $ 17,287 (1) Reflects purchases of securities under which other HSBC affiliates have agreed to repurchase. (2) Other assets and other liabilities primarily consist of derivative balances associated with hedging activities and other miscellaneous account receivables and payables. Other assets also includes receivables from HSBC Bank plc associated with certain client share repurchase transactions. Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 (in millions) Income (Expense): Interest income $ 66 $ 56 $ 181 $ 170 Interest expense (140) (132) (423) (375) Net interest expense (74) (76) (242) (205) Trading revenue (expense) (2,194) 1,043 (5,275) (372) Servicing and other fees from HSBC affiliates: HSBC Bank plc 50 47 147 125 HSBC Markets (USA) Inc. ("HMUS") 24 21 74 61 Other HSBC affiliates 25 19 59 52 Total servicing and other fees from HSBC affiliates 99 87 280 238 Gain (loss) on instruments designated at fair value and related derivatives 218 (233) 316 467 Support services from HSBC affiliates: HSBC Technology & Services (USA) Inc. ("HTSU") (238) (241) (707) (706) HMUS (66) (59) (183) (167) Other HSBC affiliates (124) (126) (356) (362) Total support services from HSBC affiliates (428) (426) (1,246) (1,235) Rental income from HSBC affiliates (1) 11 8 39 24 Stock based compensation expense (2) (7) (4) (22) (14) (1) We receive rental income from our affiliates for certain office space, which is recorded as a component of occupancy expense, net in our consolidated statement of income. (2) Employees may participate in one or more stock compensation plans sponsored by HSBC. These expenses are included in salaries and employee benefits in our consolidated statement of income. Certain employees are also eligible to participate in a defined benefit pension plan and other postretirement plans sponsored by HSBC North America which are discussed in Note 22, "Pension and Other Postretirement Benefits," in our 2023 Form 10-K. Funding Arrangements with HSBC Affiliates: We use HSBC affiliates to fund a portion of our borrowing and liquidity needs. At September 30, 2024 and December 31, 2023, long-term debt with affiliates reflected $6.7 billion and $6.5 billion, respectively, of borrowings from HSBC North America. The outstanding balances include: • $2.0 billion of fixed-rate senior debt which matures in June 2025; • $2.0 billion of fixed-rate senior debt which matures in September 2025; • $0.5 billion of fixed-rate senior debt which matures in December 2027; • $0.5 billion of fixed-rate senior debt which matures in December 2028; • $1.5 billion of fixed-rate senior debt which matures in June 2030; and • $0.2 billion of fixed-rate senior debt which was issued during the third quarter of 2024 and matures in September 2029. We have a $4.0 billion uncommitted line of credit with HSBC North America. The available borrowing capacity under this facility is fungible between HSBC USA, HSBC Securities (USA) Inc. ("HSI") and HSBC North America, but total borrowings cannot collectively exceed $4.0 billion at any time. We had no outstanding borrowing under this credit facility at either September 30, 2024 or December 31, 2023. We also incur short-term borrowings with certain affiliates. In addition, certain affiliates have placed deposits with us. Lending and Derivative Related Arrangements Extended to HSBC Affiliates: At September 30, 2024 and December 31, 2023, we had the following loan balances outstanding with HSBC affiliates: September 30, 2024 December 31, 2023 (in millions) HMUS and subsidiaries $ 2,183 $ 1,318 HSBC North America 1,600 1,300 Other short-term affiliate lending 1 — Total loans $ 3,784 $ 2,618 HMUS and subsidiaries We have extended loans and lines of credit, some of them uncommitted, to HMUS and its subsidiaries in the amount of $14.3 billion and $13.3 billion at September 30, 2024 and December 31, 2023, respectively, of which $2.2 billion and $1.3 billion, respectively, was outstanding. The maturities of the outstanding balances range from overnight to one month. Each borrowing is re-evaluated prior to its maturity date and either extended or allowed to mature. HSBC North America Under the $4.0 billion uncommitted fungible line of credit with HSBC North America as discussed above, there was $1.6 billion and $1.3 billion outstanding at September 30, 2024 and December 31, 2023, respectively. The outstanding balance includes $1.0 billion that matures in the fourth quarter of 2024 and $600 million that matures in the second quarter of 2025. We have extended lines of credit to various other HSBC affiliates totaling $3.5 billion which did not have any outstanding balances at either September 30, 2024 or December 31, 2023. Other short-term affiliate lending In addition to loans and lines extended to affiliates discussed above, from time to time we may extend loans to affiliates which are generally short term in nature. At September 30, 2024 and December 31, 2023, there were $1 million and nil, respectively, of these loans outstanding. Derivative contracts As part of a global HSBC strategy to offset interest rate or other market risks associated with certain securities, debt issues and derivative contracts with unaffiliated third parties, we routinely enter into derivative transactions with HSBC Bank plc and other HSBC affiliates. The notional value of derivative contracts related to these transactions was approximately $787.4 billion and $719.6 billion at September 30, 2024 and December 31, 2023, respectively. The net credit exposure (defined as the net fair value of derivative assets and liabilities, including any collateral received) related to the contracts was approximately $122 million and $29 million at September 30, 2024 and December 31, 2023, respectively. We account for these transactions on a mark to market basis, with the change in value of contracts with HSBC affiliates substantially offset by the change in value of related contracts entered into with unaffiliated third parties. Services Provided Between HSBC Affiliates: Under multiple service level agreements, we provide services to and receive services from various HSBC affiliates. These activities are summarized in Note 24, "Related Party Transactions," in our 2023 Form 10-K. There have been no significant changes in these activities since December 31, 2023. Other Transactions with HSBC Affiliates: At both September 30, 2024 and December 31, 2023, we had $265 million of non-cumulative preferred stock issued and outstanding to HSBC North America. See Note 19, "Preferred Stock," in our 2023 Form 10-K for additional details.

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2024
Segment Reporting [Abstract]
Business Segments	Business Segments We have distinct businesses, which are aligned with HSBC's global business strategy: Wealth and Personal Banking ("WPB"), Commercial Banking ("CMB") and Global Banking and Markets ("GBM"). These businesses and a Corporate Center ("CC") serve as our reportable segments with the exception of GBM. Our GBM business is comprised of three distinct operating segments: Global Banking ("GB"), Markets and Securities Services ("MSS"), and Global Banking and Markets Other ("GBM Other"), which are separately reported. There have been no changes in the basis of our segmentation as compared with the presentation in our 2023 Form 10-K. Net interest income of each segment represents the difference between actual interest earned on assets and interest incurred on liabilities of the segment, adjusted for a funding charge or credit that includes both interest rate and liquidity components. Segments are charged a cost to fund assets (e.g., customer loans) and receive a funding credit for funds provided (e.g., customer deposits) based on equivalent market rates that incorporate both repricing (interest rate risk) and tenor (liquidity) characteristics. Net funding charges associated with MSS trading activities are reported within other operating income to align with the trading revenue generated by such activities. These net funding charges are reversed back into net interest income in the CC. The objective of these charges/credits is to transfer interest rate risk to one centralized unit in Markets Treasury. Markets Treasury income statement and balance sheet results are allocated to each of the global businesses based upon tangible equity levels and levels of any surplus liabilities. Certain other revenue and operating expense amounts are also apportioned among the business segments based upon the benefits derived from the activity or the relationship of the activity to other segment activity. These inter-segment transactions have not been eliminated, and we generally account for them as if they were with third parties. Our segment results are presented in accordance with HSBC Group accounting and reporting policies, which apply IFRSs as issued by the IASB. As a result, our segment results are prepared and presented using financial information prepared on the Group Reporting Basis as operating results are monitored and reviewed, trends are evaluated and decisions about allocating resources, such as employees, are primarily made on this basis. We continue, however, to monitor capital adequacy and report to regulatory agencies on a U.S. GAAP basis. There have been no changes in the measurement of segment profit as compared with the presentation in our 2023 Form 10-K. In October 2024, HSBC announced plans to simplify its organizational structure effective January 1, 2025 to accelerate delivery against its strategic priorities. We are currently evaluating the impact of these plans on our financial reporting. To the extent we make changes to the financial information being reported to our management in the future, we will evaluate any impact such changes may have on our segment reporting. A summary of significant differences between U.S. GAAP and the Group Reporting Basis as they impact our results are summarized in Note 25, "Business Segments," in our 2023 Form 10-K. There have been no significant changes since December 31, 2023 in the differences between U.S. GAAP and the Group Reporting Basis impacting our results. The following table summarizes the results for each segment on a Group Reporting Basis, as well as provides a reconciliation of total results under the Group Reporting Basis to U.S. GAAP consolidated totals: Group Reporting Basis Consolidated Amounts GBM WPB CMB GB MSS GBM Other CC Total Group Reporting Basis Adjust- ments (1) Group Reporting Basis Reclassi- fications (2) U.S. GAAP (in millions) Three Months Ended September 30, 2024 Net interest income (expense) $ 175 $ 305 $ 136 $ 13 $ (3) $ (175) $ 451 $ 9 $ (21) $ 439 Other operating income (expense) 8 29 78 72 (48) 174 313 (7) 28 334 Total operating income (expense) 183 334 214 85 (51) (1) 764 2 7 773 Expected credit losses / provision for credit losses 2 21 (4) — — — 19 (32) — (13) 181 313 218 85 (51) (1) 745 34 7 786 Operating expenses 207 187 133 78 25 24 654 10 7 671 Profit (loss) before income tax $ (26) $ 126 $ 85 $ 7 $ (76) $ (25) $ 91 $ 24 $ — $ 115 Group Reporting Basis Consolidated Amounts GBM WPB CMB GB MSS GBM Other CC Total Group Reporting Basis Adjust- ments (1) Group Reporting Basis Reclassi- fications (2) U.S. GAAP (in millions) Three Months Ended September 30, 2023 Net interest income (expense) $ 175 $ 285 $ 111 $ 4 $ (9) $ (134) $ 432 $ 1 $ (61) $ 372 Other operating income 28 74 92 115 17 120 446 (8) 79 517 Total operating income (expense) 203 359 203 119 8 (14) 878 (7) 18 889 Expected credit losses / provision for credit losses (5) 8 (18) — — — (15) 7 — (8) 208 351 221 119 8 (14) 893 (14) 18 897 Operating expenses 194 175 144 68 19 36 636 4 18 658 Profit (loss) before income tax $ 14 $ 176 $ 77 $ 51 $ (11) $ (50) $ 257 $ (18) $ — $ 239 Nine Months Ended September 30, 2024 Net interest income (expense) $ 529 $ 884 $ 369 $ 30 $ 18 $ (502) $ 1,328 $ 22 $ (73) $ 1,277 Other operating income (expense) 133 189 266 231 (2) 507 1,324 (13) 99 1,410 Total operating income 662 1,073 635 261 16 5 2,652 9 26 2,687 Expected credit losses / provision for credit losses — 56 (4) — — — 52 (16) — 36 662 1,017 639 261 16 5 2,600 25 26 2,651 Operating expenses 592 555 398 238 72 142 1,997 17 26 2,040 Profit (loss) before income tax $ 70 $ 462 $ 241 $ 23 $ (56) $ (137) $ 603 $ 8 $ — $ 611 Balances at end of period: Total assets $ 38,385 $ 54,909 $ 10,122 $ 35,264 $ 38,053 $ 4,278 $ 181,011 $ (13,212) $ — $ 167,799 Total loans, net 25,785 24,045 9,828 117 76 — 59,851 (1,054) 2,670 61,467 Goodwill — 358 — — — — 358 100 — 458 Total deposits 28,903 43,333 40,881 1,393 1,264 — 115,774 (1,192) 8,791 123,373 Nine Months Ended September 30, 2023 Net interest income (expense) $ 582 $ 858 $ 373 $ 32 $ (21) $ (347) $ 1,477 $ 4 $ (192) $ 1,289 Other operating income 132 225 238 261 63 317 1,236 (57) 239 1,418 Total operating income (expense) 714 1,083 611 293 42 (30) 2,713 (53) 47 2,707 Expected credit losses / provision for credit losses (3) 38 12 — — — 47 1 — 48 717 1,045 599 293 42 (30) 2,666 (54) 47 2,659 Operating expenses 420 484 420 208 51 104 1,687 200 47 1,934 Profit (loss) before income tax $ 297 $ 561 $ 179 $ 85 $ (9) $ (134) $ 979 $ (254) $ — $ 725 Balances at end of period: Total assets $ 42,719 $ 52,215 $ 9,554 $ 42,663 $ 36,303 $ 2,988 $ 186,442 $ (22,085) $ — $ 164,357 Total loans, net 23,178 23,119 9,009 104 394 — 55,804 (313) 1,525 57,016 Goodwill — 358 — — — — 358 100 — 458 Total deposits 29,253 44,948 38,810 825 1,668 — 115,504 (3,853) 8,277 119,928 (1) Represents adjustments associated with differences between U.S. GAAP and the Group Reporting Basis. (2) Represents differences in financial statement presentation between U.S. GAAP and the Group Reporting Basis.

Retained Earnings and Regulator

Retained Earnings and Regulatory Capital Requirements	9 Months Ended
	Sep. 30, 2024
Retained Earnings Note Disclosure [Abstract]
Retained Earnings and Regulatory Capital Requirements	Retained Earnings and Regulatory Capital Requirements Bank dividends are one of the sources of funds used for payment of shareholder dividends and other HSBC USA cash needs. Approval from the Office of the Comptroller of the Currency ("OCC") is required if the total of all dividends HSBC Bank USA declares in any year exceeds the cumulative net income for that year, combined with the net income for the two preceding years reduced by dividends attributable to those years. OCC approval also is required for a reduction of permanent capital of HSBC Bank USA. Under a separate restriction, payment of dividends is prohibited in amounts greater than undivided profits then on hand, after deducting actual losses and bad debts. Bad debts are debts due and unpaid for a period of six months unless well secured, as defined, and in the process of collection. We are subject to regulatory capital rules issued by U.S. banking regulators including Basel III (the "Basel III rule"). A bank or bank holding company's failure to meet minimum capital requirements can result in certain mandatory actions and possibly additional discretionary actions by its regulators. The following table summarizes the capital amounts and ratios of HSBC USA and HSBC Bank USA, calculated in accordance with the Basel III rule at September 30, 2024 and December 31, 2023: September 30, 2024 December 31, 2023 Capital Well-Capitalized Ratio (1) Actual Capital Well-Capitalized Ratio (1) Actual (dollars are in millions) Common equity Tier 1 ratio: HSBC USA $ 13,279 4.5 % (2) 13.0 % $ 12,822 4.5 % (2) 13.0 % HSBC Bank USA 15,527 6.5 15.9 15,407 6.5 16.1 Tier 1 capital ratio: HSBC USA 13,544 6.0 13.3 13,087 6.0 13.3 HSBC Bank USA 17,027 8.0 17.5 16,907 8.0 17.7 Total capital ratio: HSBC USA 15,889 10.0 15.5 15,452 10.0 15.7 HSBC Bank USA 19,077 10.0 19.6 19,024 10.0 19.9 Tier 1 leverage ratio: HSBC USA 13,544 4.0 (2) 8.2 13,087 4.0 (2) 7.7 HSBC Bank USA 17,027 5.0 10.5 16,907 5.0 10.2 Risk-weighted assets: (3) HSBC USA 102,195 98,450 HSBC Bank USA 97,500 95,455 Adjusted quarterly average assets: (4) HSBC USA 166,088 170,527 HSBC Bank USA 161,401 166,526 (1) HSBC USA and HSBC Bank USA are categorized as "well-capitalized," as defined by their principal regulators. To be categorized as well-capitalized under regulatory guidelines, a banking institution must maintain capital equal to or in excess of the ratios reflected in the above table, and must not be subject to a directive, order, or written agreement to meet and maintain specific capital levels. (2) There are no common equity Tier 1 or Tier 1 leverage ratio components in the definition of a well-capitalized bank holding company. The ratios shown are the regulatory minimums. (3) Calculated using the Standardized Approach. (4) Represents the Tier 1 leverage ratio denominator which reflects quarterly average assets adjusted for amounts permitted to be deducted from Tier 1 capital. During the third quarter of 2024, HSBC USA received a common stock dividend of $600 million from its subsidiary, HSBC Bank USA.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	Variable Interest Entities In the ordinary course of business, we have organized or invested in special purpose entities ("SPEs") primarily to facilitate our own and our clients' financing and investing needs. For disclosure purposes, we aggregate SPEs based on the purpose, risk characteristics and business activities of the SPEs. An SPE is a VIE if it lacks sufficient equity investment at risk to finance its activities without additional subordinated financial support or, as a group, the holders of the equity investment at risk lack either a) the power through voting or similar rights to direct the activities of the entity that most significantly impacts the entity's economic performance; or b) the obligation to absorb the entity's expected losses, the right to receive the expected residual returns, or both. Variable Interest Entities We consolidate VIEs in which we hold a controlling financial interest as evidenced by the power to direct the activities of a VIE that most significantly impact its economic performance and the obligation to absorb losses of, or the right to receive benefits from, the VIE that could potentially be significant to the VIE and therefore are deemed to be the primary beneficiary. We take into account our entire involvement in a VIE (explicit or implicit) in identifying variable interests that individually or in the aggregate could be significant enough to warrant our designation as the primary beneficiary and hence require us to consolidate the VIE or otherwise require us to make appropriate disclosures. We consider our involvement to be potentially significant where we, among other things, (i) enter into derivative contracts to absorb the risks and benefits from the VIE or from the assets held by the VIE; (ii) provide a financial guarantee that covers assets held or liabilities issued by a VIE; (iii) sponsor the VIE in that we design, organize and structure the transaction; and (iv) retain a financial or servicing interest in the VIE. We are required to evaluate whether to consolidate a VIE when we first become involved and on an ongoing basis. In almost all cases, a qualitative analysis of our involvement in the entity provides sufficient evidence to determine whether we are the primary beneficiary. In rare cases, a more detailed analysis to quantify the extent of variability to be absorbed by each variable interest holder is required to determine the primary beneficiary. Consolidated VIEs The following table summarizes assets and liabilities related to our consolidated VIEs at September 30, 2024 and December 31, 2023 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation. September 30, 2024 December 31, 2023 Consolidated Consolidated Consolidated Consolidated (in millions) Low income housing limited liability partnership: Other assets $ 13 $ — $ 23 $ — Interest, taxes and other liabilities — 21 — 17 Total $ 13 $ 21 $ 23 $ 17 Low income housing limited liability partnership In 2009, all low income housing investments held by us at the time were transferred to a limited liability partnership ("LLP"). The LLP was created in order to ensure the utilization of future tax benefits from these low income housing tax projects. The LLP was deemed to be a VIE because it does not have sufficient equity investment at risk to finance its activities. Upon entering into this transaction, we concluded that we were the primary beneficiary of the LLP due to the nature of our continuing involvement and, as a result, we consolidate the LLP and report the assets of the LLP in other assets on our consolidated balance sheet. The investments held by the LLP represent equity investments in the underlying low income housing partnerships. The LLP does not consolidate the underlying partnerships because it does not have the power to direct the activities of the partnerships that most significantly impact the economic performance of the partnerships. We amortize our low income housing investments in proportion to the allocated tax benefits under the proportional amortization method and present the associated tax benefits net of investment amortization in income tax expense. Unconsolidated VIEs We also have variable interests in other VIEs that are not consolidated because we are not the primary beneficiary. The following table provides additional information on these unconsolidated VIEs, including the variable interests held by us and our maximum exposure to loss arising from our involvement in these VIEs, at September 30, 2024 and December 31, 2023: Total Assets Held by Unconsolidated VIEs Carrying Value of Variable Interests Held Reported as Maximum Assets Liabilities (in millions) At September 30, 2024 Limited partnership investments $ 6,519 $ 895 $ 387 $ 895 Asset-backed financing SPEs 1,107 767 — 774 Total $ 7,626 $ 1,662 $ 387 $ 1,669 At December 31, 2023 Limited partnership investments $ 6,718 $ 793 $ 327 $ 793 Asset-backed financing SPEs 1,107 938 — 938 Total $ 7,825 $ 1,731 $ 327 $ 1,731 Information on the types of VIEs with which we are involved, the nature of our involvement and the variable interests held in those entities is presented below. Limited partnership investments We invest as a limited partner in partnerships that operate qualified affordable housing, renewable energy and community development projects. The returns of these investments are generated primarily from the tax benefits, including Federal tax credits and tax deductions from operating losses in the project companies. In addition, some of the investments help us comply with the Community Reinvestment Act. Certain limited partnership structures are considered to be VIEs because either (a) they do not have sufficient equity investment at risk or (b) the limited partners with equity at risk do not have substantive kick-out rights through voting rights or substantive participating rights over the general partner. As a limited partner, we are not the primary beneficiary of the VIEs and do not consolidate them. Our investments in these partnerships are recorded in other assets on the consolidated balance sheet. The maximum exposure to loss shown in the table above represents our recorded investments as well as any outstanding funding commitments extended to the partnerships. Asset-backed financing SPEs In 2023 and 2021, we sold portfolios of commercial real estate loans and provided loans to the third-party buyer sponsored SPEs for portions of the purchase prices. The SPEs are asset-backed financing entities that issued residual beneficial interests to third-party investors. The loans we provided to the SPEs are senior to the residual beneficial interests and are secured by the commercial real estate loans held by the SPEs. The SPEs are VIEs in which we have variable interests through our ownership of the loans, which are arm's-length transactions. We do not have the power to direct the activities that most significantly impact the VIEs' economic performance. In addition, the VIEs are designed such that the residual interest holders absorb any expected loss and/or benefit that could be potentially significant to the VIEs and, therefore, we are not the primary beneficiaries. The maximum exposure to loss shown in the table above represents our recorded investments in the loans as well as any unfunded commitments without consideration of any recovery benefits from the value of the commercial real estate loans. Third-party sponsored securitization entities We invest in asset-backed securities issued by third-party sponsored securitization entities which may be considered VIEs. The investments are transacted at arm's-length and decisions to invest are based on a credit analysis of the underlying collateral assets or the issuer. We are a passive investor in these issuers and do not have the power to direct the activities of these issuers. As such, we do not consolidate these securitization entities. Additionally, we do not have other involvements in servicing or managing the collateral assets or provide financial or liquidity support to these issuers which potentially give rise to risk of loss exposure. These investments are an integral part of the disclosure in Note 2, "Trading Assets and Liabilities," Note 3, "Securities," and Note 17, "Fair Value Measurements," and, therefore, are not disclosed in this note to avoid redundancy. Similarly, in the ordinary course of business, we also provide loans and loan commitments to third-party sponsored securitization entities which may be considered VIEs for which we generally have no other form of involvement. We do not have the power to direct the activities of these entities and do not consolidate these entities. These loans are reported and disclosed in Note 4, "Loans," in the same manner as all other loans. In addition to the above, we have established and manage money market funds and non-money market mutual funds to provide customers with investment opportunities. As fund manager, we may be entitled to receive management fees based on the assets under management. We do not consolidate the funds because we do not absorb the majority of the expected future risk associated with the fund's assets, including interest rate, liquidity, credit and other relevant risks that are expected to affect the value of the assets.

Guarantee Arrangements, Pledged

Guarantee Arrangements, Pledged Assets and Repurchase Agreements	9 Months Ended
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Guarantee Arrangements, Pledged Assets and Repurchase Agreements	Guarantee Arrangements, Pledged Assets and Repurchase Agreements Guarantee Arrangements As part of our normal operations, we enter into credit derivatives and various off-balance sheet guarantee arrangements with affiliates and third parties. These arrangements arise principally in connection with our lending and client intermediation activities and include standby letters of credit and certain credit derivative transactions. The contractual amounts of these arrangements represent our maximum possible credit exposure in the event that we are required to fulfill the maximum obligation under the contractual terms of the guarantee. The following table presents total carrying value and contractual amounts of our sell protection credit derivatives and major off-balance sheet guarantee arrangements at September 30, 2024 and December 31, 2023. Following the table is a description of the various arrangements. September 30, 2024 December 31, 2023 Carrying Notional / Maximum Carrying Notional / Maximum (in millions) Credit derivatives (1)(2) $ 143 $ 5,642 $ 54 $ 2,992 Financial standby letters of credit, net of participations (3)(4) — 5,469 — 5,785 Performance standby letters of credit, net of participations (3)(4) — 3,180 — 3,320 Total $ 143 $ 14,291 $ 54 $ 12,097 (1) Includes $2,557 million and $1,483 million of notional issued for the benefit of HSBC affiliates at September 30, 2024 and December 31, 2023, respectively. (2) For credit derivatives, the maximum loss is represented by the notional amounts without consideration of mitigating effects from collateral or recourse arrangements. (3) Includes $1,740 million and $2,080 million of both financial and performance standby letters of credit issued for the benefit of HSBC affiliates at September 30, 2024 and December 31, 2023, respectively. (4) For standby letters of credit, maximum loss represents losses to be recognized assuming the letters of credit have been fully drawn and the obligors have defaulted with zero recovery. Credit-Risk Related Guarantees Credit derivatives Credit derivatives are financial instruments that transfer the credit risk of a reference obligation from the credit protection buyer to the credit protection seller who is exposed to the credit risk without buying the reference obligation. We sell credit protection on underlying reference obligations (such as loans or securities) by entering into credit derivatives, primarily in the form of credit default swaps, with various institutions. We account for all credit derivatives at fair value. Where we sell credit protection to a counterparty that holds the reference obligation, the arrangement is effectively a financial guarantee on the reference obligation. Under a credit derivative contract, the credit protection seller will reimburse the credit protection buyer upon occurrence of a credit event (such as bankruptcy, insolvency, restructuring or failure to meet payment obligations when due) as defined in the derivative contract, in return for a periodic premium. Upon occurrence of a credit event, we will pay the counterparty the stated notional amount of the derivative contract and receive the underlying reference obligation. The recovery value of the reference obligation received could be significantly lower than its notional principal amount when a credit event occurs. Certain derivative contracts are subject to master netting arrangements and related collateral agreements. A party to a derivative contract may demand that the counterparty post additional collateral in the event its net exposure exceeds certain predetermined limits and when the credit rating falls below a certain grade. We set the collateral requirements by counterparty such that the collateral covers various transactions and products, and is not allocated to specific individual contracts. We manage our exposure to credit derivatives using a variety of risk mitigation strategies where we enter into offsetting hedge positions or transfer the economic risks, in part or in entirety, to investors through the issuance of structured credit products. We actively manage the credit and market risk exposure in the credit derivative portfolios on a net basis and, as such, retain no or a limited net position at any time. The following table summarizes our net credit derivative positions at September 30, 2024 and December 31, 2023: September 30, 2024 December 31, 2023 Carrying / Fair Notional Carrying / Fair Notional (in millions) Sell-protection credit derivative positions $ 143 $ 5,642 $ 54 $ 2,992 Buy-protection credit derivative positions (278) 13,379 (196) 13,718 Net position (1) $ (135) $ 7,737 $ (142) $ 10,726 (1) Positions are presented net in the table above to provide a complete analysis of our risk exposure and depict the way we manage our credit derivative portfolio. The offset of the sell-protection credit derivatives against the buy-protection credit derivatives may not be legally binding in the absence of master netting agreements with the same counterparty. Furthermore, the credit loss triggering events for individual sell-protection credit derivatives may not be the same or occur in the same period as those of the buy-protection credit derivatives thereby not providing an exact offset. Standby letters of credit A standby letter of credit is issued to a third party for the benefit of a client and is a guarantee that the client will perform or satisfy certain obligations under a contract. It irrevocably obligates us to pay a specified amount to the third-party beneficiary if the client fails to perform the contractual obligation. We issue two types of standby letters of credit: performance and financial. A performance standby letter of credit is issued where the client is required to perform some non-financial contractual obligation, such as the performance of a specific act, whereas a financial standby letter of credit is issued where the client's contractual obligation is of a financial nature, such as the repayment of a loan or debt instrument. The issuance of a standby letter of credit is subject to our credit approval process and collateral requirements. We charge fees for issuing letters of credit commensurate with the client's credit evaluation and the nature of any collateral. Included in other liabilities are deferred fees on standby letters of credit amounting to $52 million and $49 million at September 30, 2024 and December 31, 2023, respectively. Also included in other liabilities is an allowance for credit losses on unfunded standby letters of credit of $11 million and $17 million at September 30, 2024 and December 31, 2023, respectively. The following table summarizes the credit ratings related to guarantees including the ratings of counterparties against which we sold credit protection and financial standby letters of credit at September 30, 2024 as an indicative proxy of payment risk: Average Credit Ratings of the Obligors Notional/Contractual Amounts Investment Non-Investment Total (dollars are in millions) Sell-protection credit derivatives: (1) Single name credit default swaps 1.2 $ 1,021 $ 373 $ 1,394 Index credit derivatives 4.4 3,260 988 4,248 Subtotal 4,281 1,361 5,642 Standby letters of credit (2) 0.8 6,434 2,215 8,649 Total $ 10,715 $ 3,576 $ 14,291 (1) The credit ratings in the table represent external credit ratings for classification as investment grade and non-investment grade. (2) External ratings for most of the obligors are not available. Presented above are the internal credit ratings which are developed using similar methodologies and rating scale equivalent to external credit ratings for purposes of classification as investment grade and non-investment grade. Our internal credit ratings are determined based on HSBC's risk rating systems and processes which assign a credit grade based on a scale which ranks the risk of default of a client. The credit grades are assigned and used for managing risk and determining level of credit exposure appetite based on the client's operating performance, liquidity, capital structure and debt service ability. In addition, we also incorporate subjective judgments into the risk rating process concerning such things as industry trends, comparison of performance to industry peers and perceived quality of management. We compare our internal risk ratings to outside external rating agency benchmarks, where possible, at the time of formal review and regularly monitor whether our risk ratings are comparable to the external ratings benchmark data. A non-investment grade rating of a referenced obligor has a negative impact to the fair value of the credit derivative and increases the likelihood that we will be required to perform under the credit derivative contract. We employ market-based parameters and, where possible, use the observable credit spreads of the referenced obligors as measurement inputs in determining the fair value of the credit derivatives. We believe that such market parameters are more indicative of the current status of payment/performance risk than external ratings by the rating agencies which may not be forward-looking in nature and, as a result, lag behind those market-based indicators. Non Credit-Risk Related Guarantees and Other Arrangements Visa covered litigation In 2008, we received Class B Shares as part of Visa's initial public offering ("IPO"). Pursuant to the IPO, we, along with all the other Class B shareholders, agreed to indemnify Visa for the claims and obligations arising from certain specific covered litigation. The Class B Shares were not eligible to be converted into publicly traded Class A common shares ("Class A Shares") until settlement of the covered litigation described in Note 30, "Litigation and Regulatory Matters" in our 2023 Form 10-K. Accordingly, the Class B Shares were considered restricted and were only transferable under limited circumstances. In 2016 and 2017, we sold substantially all of our Visa Class B Shares to a third party. Under the terms of the sale agreements, we entered into swap agreements with the purchaser to retain the litigation risk associated with the Class B Shares sold until the related litigation is settled and the Class B Shares could be converted into Class A Shares. During the second quarter of 2024, Visa completed an exchange offer that allowed holders to exchange a portion of their Class B Shares for publicly traded Class A Shares. The purchaser of our Class B Shares participated in the exchange offer which required our existing swap agreements to be amended to reflect the reduction in notional value and a new makewhole agreement to be entered into with the purchaser in order to continue to retain the litigation risk associated with the exchanged shares. These swaps had a carrying value of $56 million and $40 million at September 30, 2024 and December 31, 2023, respectively. The swap agreements we entered into with the purchaser require us to (a) make periodic payments, calculated by reference to the market price of Class A Shares, (b) make or receive payments based on subsequent changes in the conversion rate of Class B Shares into Class A Shares and (c) for exchanged shares, make payments based on the number of shares sold by the purchaser. We have entered into total return swap positions to economically hedge the periodic payments made under these swap agreements. The payments under the derivatives will continue until the related litigation is settled and the remaining Class B Shares are able to be converted into Class A Shares. The fair value of the swap agreements is estimated using a discounted cash flow methodology and is dependent upon the final resolution of the related litigation. Changes in fair value between periods are recognized in other income (loss). During the three and nine months ended September 30, 2024, we recorded losses of $29 million and $32 million, respectively, primarily related to extending the expected timing of the final resolution of the related litigation and a change in the Visa Class B share conversion rate compared with losses of $34 million and $40 million during the three and nine months ended September 30, 2023, respectively. See Note 8, "Derivative Financial Instruments," for further information. Clearing houses and exchanges We are a member of various exchanges and clearing houses that trade and clear securities and/or derivatives contracts. Under the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, members of a clearing house may be required to contribute to a guaranty fund to backstop members' obligations to the clearing house. As a member, we may be required to pay a proportionate share of the financial obligations of another member who defaults on its obligations to the exchange or the clearing house. Our guarantee obligations would arise only if the exchange or clearing house had exhausted its resources. Any potential contingent liability under these membership agreements cannot be estimated. Lease Obligations We are obligated under a number of noncancellable operating leases for premises and equipment. See Note 12, "Leases," in our 2023 Form 10-K for a full discussion of our leases, including a maturity analysis of our operating lease liabilities. During the second quarter of 2024, we modified the lease for our new U.S. headquarters to include additional office space which resulted in an increase to the lease right-of-use ("ROU") asset and a corresponding increase to the operating lease liability of $53 million. Mortgage Loan Repurchase Obligations We originate and sell mortgage loans to third parties and provide various representations and warranties related to, among other things, the ownership of the loans, the validity of the liens, the loan selection and origination process, and the compliance to the origination criteria established by the government agencies. In the event of a breach of our representations and warranties, we may be obligated to repurchase the loans with identified defects or to indemnify the buyers. Our contractual obligation arises only when the breach of representations and warranties are discovered and repurchase is demanded. In estimating our repurchase liability arising from breaches of representations and warranties, we consider historical losses on residual risks not covered by settlement agreements adjusted for any risk factors not captured in the historical losses as well as the level of outstanding repurchase demands received. Outstanding repurchase demands received were immaterial at both September 30, 2024 and December 31, 2023. Our estimated repurchase liability for obligations arising from the breach of representations and warranties associated with mortgage loans sold was $4 million and $23 million at September 30, 2024 and December 31, 2023, respectively. Our repurchase liability represents our best estimate of the loss that has been incurred, including interest, arising from breaches of representations and warranties associated with mortgage loans sold. Because the level of mortgage loan repurchase losses is dependent upon economic factors, investor demand strategies and other external risk factors such as housing market trends that may change, the level of the liability for mortgage loan repurchase losses requires significant judgment. We continue to evaluate our methods of determining the best estimate of loss based on recent trends. As these estimates are influenced by factors outside our control, there is uncertainty inherent in these estimates making it reasonably possible that they could change. The range of reasonably possible losses in excess of our recorded repurchase liability is between zero and $25 million at September 30, 2024. This estimated range of reasonably possible losses was determined primarily based upon modifying the assumptions utilized in our best estimate of probable losses to reflect what we believe to be reasonably possible adverse assumptions. Securitization Activity In addition to the repurchase risk described above, we have also been involved as a sponsor/seller of loans used to facilitate whole loan securitizations underwritten by our affiliate, HSI. In this regard, we began acquiring residential mortgage loans in 2005 which were warehoused on our balance sheet with the intent of selling them to HSI to facilitate HSI's whole loan securitization program which was discontinued in 2007. During 2005-2007, we purchased and sold $24 billion of such loans to HSI which were subsequently securitized and sold by HSI to third parties. See "Mortgage Securitization Matters" in Note 30, "Litigation and Regulatory Matters," in our 2023 Form 10-K for additional discussion of related exposure. The outstanding principal balance on these loans was approximately $2.3 billion and $2.4 billion at September 30, 2024 and December 31, 2023, respectively. Pledged Assets Pledged assets included in the consolidated balance sheet consisted of the following: September 30, 2024 December 31, 2023 (in millions) Interest bearing deposits with banks (1) $ 1,072 $ 998 Trading assets (2) 3,417 3,046 Securities available-for-sale (3) 14,554 9,773 Securities held-to-maturity (3) 9,991 5,387 Loans (4) 23,805 18,810 Other assets (5) 849 934 Total $ 53,688 $ 38,948 (1) Represents gross amount of cash on deposit with banks primarily related to derivative collateral-support agreements, of which a majority has been netted against derivative liabilities on the consolidated balance sheet. (2) Trading assets are primarily pledged against liabilities associated with repurchase agreements. (3) Securities are primarily pledged against derivatives, public fund deposits, trust deposits and various short-term and long term borrowings, as well as providing capacity for potential secured borrowings from the FHLB and the Federal Reserve Bank of New York. (4) Loans are primarily residential mortgage loans pledged against current and potential borrowings from the FHLB and the Federal Reserve Bank of New York. (5) Represents gross amount of cash on deposit with non-banks primarily related to derivative collateral support agreements, of which a majority has been netted against derivative liabilities on the consolidated balance sheet. Debt securities pledged as collateral under repurchase agreements that can be sold or repledged by the secured party continue to be reported on the consolidated balance sheet. The fair value of securities available-for-sale that could be sold or repledged was $1,567 million and $161 million at September 30, 2024 and December 31, 2023, respectively. The fair value of trading assets that could be sold or repledged was $3,417 million and $3,046 million at September 30, 2024 and December 31, 2023, respectively. The fair value of collateral we accepted under security resale agreements but was not reported on the consolidated balance sheet was $8,919 million and $19,278 million at September 30, 2024 and December 31, 2023, respectively. Of this collateral, $8,269 million and $19,278 million could be sold or repledged at September 30, 2024 and December 31, 2023, respectively, of which $781 million and $2,696 million, respectively, had been sold or repledged as collateral under repurchase agreements or to cover short sales. Repurchase Agreements We enter into purchases of securities under agreements to resell (resale agreements) and sales of securities under agreements to repurchase (repurchase agreements) identical or substantially the same securities. Resale and repurchase agreements are accounted for as secured lending and secured borrowing transactions, respectively. Repurchase agreements may require us to deposit cash or other collateral with the lender. In connection with resale agreements, it is our policy to obtain possession of collateral, which may include the securities purchased, with market value in excess of the principal amount loaned. The market value of the collateral subject to the resale and repurchase agreements is regularly monitored, and additional collateral is obtained or provided when appropriate, to ensure appropriate collateral coverage of these secured financing transactions. The following table provides information about resale and repurchase agreements that are subject to offset at September 30, 2024 and December 31, 2023: Gross Amounts Not Offset in the Balance Sheet Gross Amounts Recognized Gross Amounts Offset in the Balance Sheet (1) Net Amounts Presented in the Balance Sheet Financial Instruments (2) Cash Collateral Received / Pledged Net Amount (3) (in millions) At September 30, 2024 Assets: Securities purchased under resale agreements $ 8,788 $ 4,478 $ 4,310 $ 4,305 $ — $ 5 Liabilities: Securities sold under repurchase agreements $ 5,697 $ 4,478 $ 1,219 $ 1,212 $ — $ 7 At December 31, 2023 Assets: Securities purchased under resale agreements $ 19,382 $ 5,504 $ 13,878 $ 13,677 $ 7 $ 194 Liabilities: Securities sold under repurchase agreements $ 5,771 $ 5,504 $ 267 $ 266 $ — $ 1 (1) Represents recognized amount of resale and repurchase agreements with counterparties subject to legally enforceable netting agreements that meet the applicable netting criteria as permitted by generally accepted accounting principles. (2) Represents securities received or pledged to cover financing transaction exposures. (3) Represents the amount of our exposure that is not collateralized / covered by pledged collateral. The following table provides the class of collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings at September 30, 2024 and December 31, 2023: Overnight and Continuous Up to 30 Days 31 to 90 Days 91 Days to One Year Greater Than One Year Total (in millions) At September 30, 2024 U.S. Treasury, U.S. Government sponsored and U.S. Government agency securities $ 3,531 $ 594 $ 944 $ 628 $ — $ 5,697 At December 31, 2023 U.S. Treasury, U.S. Government sponsored and U.S. Government agency securities $ 3,107 $ 288 $ 918 $ 1,458 $ — $ 5,771

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Accounting principles related to fair value measurements provide a framework for measuring fair value that focuses on the exit price that would be received to sell an asset or paid to transfer a liability in the principal market (or in the absence of the principal market, the most advantageous market) accessible in an orderly transaction between willing market participants (the "Fair Value Framework"). Where required by the applicable accounting standards, assets and liabilities are measured at fair value using the "highest and best use" valuation premise. Fair value measurement guidance clarifies that financial instruments do not have alternative use and, as such, the fair value of financial instruments should be determined using an "in-exchange" valuation premise. However, the fair value measurement guidance provides a valuation exception and permits an entity to measure the fair value of a group of financial assets and financial liabilities with offsetting credit risks and/or market risks based on the exit price it would receive or pay to transfer the net risk exposure of a group of assets or liabilities if certain conditions are met. We elected to apply the measurement exception to a group of derivative instruments with offsetting credit risks and market risks, which primarily relate to interest rate, foreign currency, debt and equity price risk, and commodity price risk as of the reporting date. Fair Value Adjustments The best evidence of fair value is quoted market price in an actively traded market, where available. In the event listed price or market quotes are not available, valuation techniques that incorporate relevant transaction data and market parameters reflecting the attributes of the asset or liability under consideration are applied. Where applicable, fair value adjustments are made to ensure the financial instruments are appropriately recorded at fair value. The fair value adjustments reflect the risks associated with the products, contractual terms of the transactions, and the liquidity of the markets in which the transactions occur. The fair value adjustments are broadly categorized by the following major types: Credit valuation adjustment - The credit valuation adjustment is an adjustment to a group of financial assets and financial liabilities, predominantly derivative assets and derivative liabilities, to reflect the credit quality of the parties to the transaction in arriving at fair value. A credit valuation adjustment to a financial asset is required to reflect the default risk of the counterparty. A debit valuation adjustment to a financial liability is recorded to reflect the default risk of HUSI. See "Valuation Techniques - Derivatives" below for additional details. Liquidity risk adjustment - The liquidity risk adjustment (primarily in the form of bid-offer adjustment) reflects the cost that would be incurred to close out the market risks by hedging, disposing or unwinding the position. Valuation models generally produce mid-market values. The bid-offer adjustment is made in such a way that results in a measure that reflects the exit price that most represents the fair value of the financial asset or financial liability under consideration or, where applicable, the fair value of the net market risk exposure of a group of financial assets or financial liabilities. These adjustments relate primarily to Level 2 assets. Model valuation adjustment - Where fair value measurements are determined using an internal valuation model based on observable and unobservable inputs, certain valuation inputs may be less readily determinable. There may be a range of possible valuation inputs that market participants may assume in determining the fair value measurement. The resultant fair value measurement has inherent measurement risk if one or more parameters are unobservable and must be estimated. An input valuation adjustment is necessary to reflect the likelihood that market participants may use different input parameters, and to mitigate the possibility of measurement error. In addition, the values derived from valuation techniques are affected by the choice of valuation model and model limitation. When different valuation techniques are available, the choice of valuation model can be subjective. Furthermore, the valuation model applied may have measurement limitations. In those cases, an additional valuation adjustment is also applied to mitigate the measurement risk. Model valuation adjustments are not material and relate primarily to Level 2 instruments. We apply stress scenarios in determining appropriate liquidity risk and model risk adjustments for Level 3 fair values by reviewing the historical data for unobservable inputs (e.g., correlation, volatility). Some stress scenarios involve at least a 95 percent confidence interval (i.e., two standard deviations). We also utilize unobservable parameter adjustments when instruments are valued using internally developed models which reflects the uncertainty in the value estimates provided by the model. Funding Fair Value Adjustment ("FFVA") - The FFVA reflects the estimated present value of the future market funding cost or benefit associated with funding uncollateralized derivative exposure at unsecured funding spreads. See "Valuation Techniques - Derivatives" below for additional details. Fair Value Hierarchy The Fair Value Framework establishes a three-tiered fair value hierarchy as follows: Level 1 quoted market price - Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 valuation technique using observable inputs - Level 2 inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are inactive, and measurements determined using valuation models where all significant inputs are observable, such as interest rates and yield curves that are observable at commonly quoted intervals. Level 3 valuation technique with significant unobservable inputs - Level 3 inputs are unobservable inputs for the asset or liability and include situations where fair values are measured using valuation techniques based on one or more significant unobservable inputs. Classification within the fair value hierarchy is based on whether the lowest hierarchical level input that is significant to the fair value measurement is observable. As such, the classification within the fair value hierarchy is dynamic and can be transferred to other hierarchy levels in each reporting period. Where fair value measurements are determined based on information obtained from independent pricing services or brokers, we apply appropriate validation procedures to substantiate fair value. For price validation purposes, quotations from at least two independent pricing sources are obtained for each financial instrument, where possible. The following factors are considered in determining fair values: • similarities between the asset or the liability under consideration and the asset or liability for which quotation is received; • collaboration of pricing by referencing to other independent market data such as market transactions and relevant benchmark indices; • consistency among different pricing sources; • the valuation approach and the methodologies used by the independent pricing sources in determining fair value; • the elapsed time between the date to which the market data relates and the measurement date; • the source of the fair value information; and • whether the security is traded in an active or inactive market. Greater weight is given to quotations of instruments with recent market transactions, pricing quotes from dealers who stand ready to transact, quotations provided by market-makers who structured such instrument and market consensus pricing based on inputs from a large number of survey participants. Any significant discrepancies among the external quotations are reviewed and adjustments to fair values are recorded where appropriate. Where the transaction volume of a specific instrument has been reduced and the fair value measurement becomes less transparent, we will apply more detailed procedures to understand and challenge the appropriateness of the unobservable inputs and the valuation techniques used by the independent pricing service. Where applicable, we will develop a fair value estimate using our own pricing model inputs to test reasonableness. Where fair value measurements are determined using internal valuation models, we will validate the fair value measurement by either developing unobservable inputs based on the industry consensus pricing surveys in which we participate or back testing by observing the actual settlements occurring soon after the measurement date. Assets and Liabilities Recorded at Fair Value on a Recurring Basis The following table presents information about our assets and liabilities measured at fair value on a recurring basis at September 30, 2024 and December 31, 2023, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value. Unless otherwise noted below, assets and liabilities in the following table are recorded at fair value through net income. Fair Value Measurements on a Recurring Basis September 30, 2024 Level 1 Level 2 Level 3 Gross Netting (1) Net (in millions) Assets: Trading assets, excluding derivatives: U.S. Treasury, U.S. Government agencies and sponsored enterprises $ 4,038 $ 1,229 $ — $ 5,267 $ — $ 5,267 Debt securities issued by foreign entities 759 — — 759 — 759 Equity securities 14,344 — — 14,344 — 14,344 Precious metals trading — 160 — 160 — 160 Derivatives: (2) Interest rate contracts 7 897 3 907 — 907 Foreign exchange contracts — 9,568 5 9,573 — 9,573 Equity contracts 5 714 212 931 — 931 Precious metals contracts — 1,288 — 1,288 — 1,288 Credit contracts — 122 — 122 — 122 Other contracts (3) — — 11 11 — 11 Derivatives netting — — — — (11,598) (11,598) Total derivatives 12 12,589 231 12,832 (11,598) 1,234 Securities available-for-sale: (4) U.S. Treasury, U.S. Government agencies and sponsored enterprises 10,012 11,858 — 21,870 — 21,870 Asset-backed securities: Home equity — — 10 10 — 10 Other — — 92 92 — 92 Debt securities issued by foreign entities 3,970 — — 3,970 — 3,970 Loans (5) — 12 — 12 — 12 Loans held for sale (5) — 595 78 673 — 673 Other assets: Mortgage servicing rights — — 7 7 — 7 Equity securities — 130 — 130 — 130 Equity securities measured at net asset value (6) — — — 130 — 130 Total assets $ 33,135 $ 26,573 $ 418 $ 60,256 $ (11,598) $ 48,658 Liabilities: Domestic deposits (5) $ — $ 2,182 $ 412 $ 2,594 $ — $ 2,594 Trading liabilities, excluding derivatives 1,528 238 — 1,766 — 1,766 Derivatives: (2) Interest rate contracts 1 752 5 758 — 758 Foreign exchange contracts — 9,680 5 9,685 — 9,685 Equity contracts — 1,129 135 1,264 — 1,264 Precious metals contracts — 1,271 — 1,271 — 1,271 Credit contracts — 264 1 265 — 265 Other contracts (3) — — 56 56 — 56 Derivatives netting — — — — (11,939) (11,939) Total derivatives 1 13,096 202 13,299 (11,939) 1,360 Long-term debt (5) — 4,715 2,430 7,145 — 7,145 Total liabilities $ 1,529 $ 20,231 $ 3,044 $ 24,804 $ (11,939) $ 12,865 Fair Value Measurements on a Recurring Basis December 31, 2023 Level 1 Level 2 Level 3 Gross Netting (1) Net (in millions) Assets: Trading assets, excluding derivatives: U.S. Treasury, U.S. Government agencies and sponsored enterprises $ 3,564 $ 1,208 $ — $ 4,772 $ — $ 4,772 Debt securities issued by foreign entities 4,019 — — 4,019 — 4,019 Equity securities 11,702 — — 11,702 — 11,702 Precious metals trading — 346 — 346 — 346 Derivatives: (2) Interest rate contracts 7 1,246 2 1,255 — 1,255 Foreign exchange contracts — 13,605 1 13,606 — 13,606 Equity contracts 7 844 190 1,041 — 1,041 Precious metals contracts 3 1,150 — 1,153 — 1,153 Credit contracts — 107 2 109 — 109 Other contracts (3) — — 5 5 — 5 Derivatives netting — — — — (15,870) (15,870) Total derivatives 17 16,952 200 17,169 (15,870) 1,299 Securities available-for-sale: (4) U.S. Treasury, U.S. Government agencies and sponsored enterprises 7,799 15,324 — 23,123 — 23,123 Asset-backed securities: Home equity — — 12 12 — 12 Other — — 92 92 — 92 Debt securities issued by foreign entities 2,359 110 — 2,469 — 2,469 Loans (5) — 15 — 15 — 15 Loans held for sale (5) — 218 32 250 — 250 Other assets: Mortgage servicing rights — — 19 19 — 19 Equity securities — 127 — 127 — 127 Equity securities measured at net asset value (6) — — — 143 — 143 Other (5)(7) — 10 — 10 — 10 Total assets $ 29,460 $ 34,310 $ 355 $ 64,268 $ (15,870) $ 48,398 Liabilities: Domestic deposits (5) $ — $ 1,528 $ 293 $ 1,821 $ — $ 1,821 Trading liabilities, excluding derivatives 1,688 301 — 1,989 — 1,989 Derivatives: (2) Interest rate contracts 16 1,100 6 1,122 — 1,122 Foreign exchange contracts — 13,534 1 13,535 — 13,535 Equity contracts — 1,104 169 1,273 — 1,273 Precious metals contracts — 1,033 — 1,033 — 1,033 Credit contracts — 259 1 260 — 260 Other contracts (3) — — 40 40 — 40 Derivatives netting — — — — (15,431) (15,431) Total derivatives 16 17,030 217 17,263 (15,431) 1,832 Long-term debt (5) — 5,620 1,919 7,539 — 7,539 Other liabilities (5)(7) — 10 — 10 — 10 Total liabilities $ 1,704 $ 24,489 $ 2,429 $ 28,622 $ (15,431) $ 13,191 (1) Represents counterparty and cash collateral netting which allow the offsetting of amounts relating to certain contracts if certain conditions are met. (2) Includes trading derivative assets of $1,177 million and $1,276 million and trading derivative liabilities of $1,071 million and $1,496 million at September 30, 2024 and December 31, 2023, respectively, as well as derivatives held for hedging and other non-qualifying economic hedging activities. See Note 8, "Derivative Financial Instruments," for additional information. Excluding changes in fair value of a derivative instrument associated with a qualifying cash flow hedge, which are recognized initially in other comprehensive income (loss), derivative assets and liabilities are recorded at fair value through net income. (3) Consists of swap agreements entered into in conjunction with the sales of Visa Class B Shares. (4) Securities available-for-sale are recorded at fair value through other comprehensive income (loss). Changes in the allowance for credit losses on securities available-for-sale are recorded through net income. (5) See Note 9, "Fair Value Option," for additional information. Excluding the fair value movement on fair value option liabilities attributable to our own credit spread, which is recorded in other comprehensive income (loss), fair value option assets and liabilities are recorded at fair value through net income. (6) Investments that are measured at fair value using the net asset value per share practical expedient have not been classified in the fair value hierarchy. (7) Consists of assets and liabilities associated with certain client share repurchase transactions. Information on Level 3 assets and liabilities The following table summarizes additional information about changes in the fair value of Level 3 assets and liabilities during the three and nine months ended September 30, 2024 and 2023. As a risk management practice, we may risk manage the Level 3 assets and liabilities, in whole or in part, using securities and derivative positions that are classified as Level 1 or Level 2 measurements within the fair value hierarchy. Since those Level 1 and Level 2 risk management positions are not included in the table below, the information provided does not reflect the effect of such risk management activities related to the Level 3 assets and liabilities. Jul. 1, Total Realized / Unrealized Gains Purch- Issu- Settle- Transfers Transfers Sep. 30, Current Period Unrealized Gains Earnings Other Compre- Earnings Other Compre- (in millions) Assets: Derivatives, net: (1) Interest rate contracts $ (3) $ 2 $ — $ — $ — $ — $ (1) $ — $ (2) $ 2 $ — Foreign exchange contracts — — — — — — — — — — — Equity contracts 49 61 — — — (25) 4 (12) 77 53 — Credit contracts (4) — — — — — — 3 (1) — — Other contracts (2) (21) (31) — — — 7 — — (45) — — Asset-backed securities available-for-sale (3) 101 — 2 — — (1) — — 102 — 2 Loans held for sale (4) 44 — — 16 — (10) 43 (15) 78 — — Mortgage servicing rights (5) 19 (1) — — — (11) — — 7 (1) — Total assets $ 185 $ 31 $ 2 $ 16 $ — $ (40) $ 46 $ (24) $ 216 $ 54 $ 2 Liabilities: Domestic deposits (4) $ (386) $ (16) $ — $ — $ (86) $ 23 $ — $ 53 $ (412) $ (7) $ — Long-term debt (4) (2,110) (96) — — (733) 346 (3) 166 (2,430) (64) — Total liabilities $ (2,496) $ (112) $ — $ — $ (819) $ 369 $ (3) $ 219 $ (2,842) $ (71) $ — Jan. 1, Total Realized / Unrealized Gains Purch- Issu- Settle- Transfers Transfers Sep. 30, Current Period Unrealized Gains Earnings Other Compre- Earnings Other Compre- (in millions) Assets: Derivatives, net: (1) Interest rate contracts $ (4) $ 1 $ — $ — $ — $ — $ 1 $ — $ (2) $ 1 $ — Foreign exchange contracts — — — — — — — — — — — Equity contracts 21 113 — — — (25) (3) (29) 77 75 — Credit contracts 1 (4) — — — (1) (3) 6 (1) (1) — Other contracts (2) (35) (33) — — — 23 — — (45) — — Asset-backed securities available-for-sale (3) 104 — — — — (2) — — 102 — — Loans held for sale (4) 32 1 — 52 — (43) 55 (19) 78 — — Mortgage servicing rights (5) 19 (1) — — — (11) — — 7 (1) — Total assets $ 138 $ 77 $ — $ 52 $ — $ (59) $ 50 $ (42) $ 216 $ 74 $ — Liabilities: Domestic deposits (4) $ (293) $ (23) $ (3) $ — $ (230) $ 71 $ (1) $ 67 $ (412) $ (6) $ (3) Long-term debt (4) (1,919) (235) (1) — (1,539) 916 (50) 398 (2,430) (119) (1) Total liabilities $ (2,212) $ (258) $ (4) $ — $ (1,769) $ 987 $ (51) $ 465 $ (2,842) $ (125) $ (4) Jul. 1, Total Realized / Unrealized Gains Purch- Issu- Settle- Transfers Transfers Sep. 30, Current Period Earnings Other Compre- Earnings Other Compre- (in millions) Assets: Derivatives, net: (1) Interest rate contracts $ (5) $ — $ — $ — $ — $ — $ — $ — $ (5) $ — $ — Foreign exchange contracts — — — — — — — — — — — Equity contracts (25) (83) — — — 3 4 3 (98) (63) — Credit contracts 2 — — — — — — — 2 — — Other contracts (2) (24) (31) — — — 15 — — (40) — — Asset-backed securities available-for-sale (3) 105 — (2) — — (2) — — 101 — (2) Loans held for sale (4) 3 2 — — — — 36 (5) 36 — — Mortgage servicing rights (5) 21 (1) — — — — — — 20 (1) — Total assets $ 77 $ (113) $ (2) $ — $ — $ 16 $ 40 $ (2) $ 16 $ (64) $ (2) Liabilities: Domestic deposits (4) $ (241) $ 6 $ 1 $ — $ (43) $ 26 $ — $ 1 $ (250) $ 7 $ 1 Long-term debt (4) (2,291) 37 — — (198) 326 (48) 197 (1,977) 60 — Total liabilities $ (2,532) $ 43 $ 1 $ — $ (241) $ 352 $ (48) $ 198 $ (2,227) $ 67 $ 1 Jan. 1, Total Realized / Unrealized Gains Purch- Issu- Settle- Transfers Transfers Sep. 30, Current Period Earnings Other Compre- Earnings Other Compre- (in millions) Assets: Derivatives, net: (1) Interest rate contracts $ (5) $ — $ — $ — $ — $ — $ — $ — $ (5) $ — $ — Foreign exchange contracts — — — — — — — — — — — Equity contracts (226) 106 — — — 21 3 (2) (98) 35 — Credit contracts 2 — — — — — — — 2 — — Other contracts (2) (33) (40) — — — 33 — — (40) — — Asset-backed securities available-for-sale (3) 108 — (3) — — (4) — — 101 — (3) Loans held for sale (4) 49 2 — 3 — (37) 36 (17) 36 — — Mortgage servicing rights (5) 22 (1) — — — (1) — — 20 (1) — Total assets $ (83) $ 67 $ (3) $ 3 $ — $ 12 $ 39 $ (19) $ 16 $ 34 $ (3) Liabilities: Domestic deposits (4) $ (373) $ 5 $ 2 $ — $ (44) $ 128 $ — $ 32 $ (250) $ 10 $ 2 Long-term debt (4) (2,639) (253) 3 — (572) 768 (84) 800 (1,977) (81) 3 Total liabilities $ (3,012) $ (248) $ 5 $ — $ (616) $ 896 $ (84) $ 832 $ (2,227) $ (71) $ 5 (1) Level 3 net derivatives included derivative assets of $231 million and derivative liabilities of $202 million at September 30, 2024 and derivative assets of $96 million and derivative liabilities of $237 million at September 30, 2023. Gains (losses) on derivatives, net are predominantly included in trading revenue and gain (loss) on instruments designated at fair value and related derivatives in the consolidated statement of income. (2) Consists of swap agreements entered into in conjunction with the sales of Visa Class B Shares. Gains (losses) on these swap agreements are included in other income (loss) in the consolidated statement of income. (3) Realized gains (losses) on securities available-for-sale are included in other securities gains (losses), net in the consolidated statement of income. Changes in the allowance for credit losses on securities available-for-sale are included in the provision for credit losses in the consolidated statement of income. Unrealized gains (losses) on securities available-for-sale are included in other comprehensive income (loss) (4) Excluding unrealized gains (losses) on fair value option liabilities attributable to our own credit spread, which are recorded in other comprehensive income (loss), gains (losses) on fair value option assets and liabilities are included in gain (loss) on instruments designated at fair value and related derivatives in the consolidated statement of income. (5) Gains (losses) on mortgage servicing rights are included in other income (loss) Significant Unobservable Inputs for Recurring Fair Value Measurements The following table presents quantitative information about the unobservable inputs used to determine the recurring fair value measurement of assets and liabilities classified as Level 3 fair value measurements at September 30, 2024 and December 31, 2023: September 30, 2024 Financial Instrument Type Fair Value (in millions) Valuation Technique(s) Significant Unobservable Inputs Range of Inputs Weighted Average (1) Interest rate derivative contracts $ (2) Market comparable adjusted for probability to fund and, where applicable, option pricing model Probability to fund for rate lock commitments 58% - 100% 94% Interest rate yield curve 9% N/A Foreign exchange derivative contracts $ — Option pricing model Cross-currency basis (62)bps N/A Equity derivative contracts (2) $ 77 Option pricing model Equity / Equity Index volatility 6% - 112% 49% Equity / Equity and Equity / Index correlation 35% - 98% 83% Equity forward price $0 - $7,307 $1,115 Credit derivative contracts $ (1) Option pricing model and, where applicable, discounted cash flows Credit default swap spreads 17bps - 782bps 85bps Other derivative contracts $ (45) Discounted cash flows Conversion rate 1.5 times N/A Expected duration 1.5 years N/A Asset-backed securities available-for-sale $ 102 Discounted cash flows Market assumptions related to yields for comparable instruments 2% - 3% 2% Loans held for sale $ 78 Market comparables and internal assumptions Adjusted market price 95% - 101% 97% Mortgage servicing rights $ 7 Discounted cash flows Constant prepayment rates 7% - 20% 7% Discount rate 10% - 14% 10% Estimated annualized costs to service $70 - $79 per account $76 per account Domestic deposits (structured deposits) (2)(3) $ (412) Option adjusted discounted cash flows Equity / Equity Index volatility 6% - 55% 14% Equity / Equity and Equity / Index correlation 42% - 90% 69% Long-term debt (structured notes) (2)(3) $ (2,430) Option adjusted discounted cash flows Equity / Equity Index volatility 6% - 95% 26% Equity / Equity and Equity / Index correlation 35% - 98% 85% Credit default swap spreads 742bps NA December 31, 2023 Financial Instrument Type Fair Value (in millions) Valuation Technique(s) Significant Unobservable Inputs Range of Inputs Weighted Average (1) Interest rate derivative contracts $ (4) Market comparable adjusted for probability to fund and, where applicable, option pricing model Probability to fund for rate lock commitments 71% - 92% 84% Interest rate yield curve 9% N/A Foreign exchange derivative contracts $ — Option pricing model Cross-currency basis 8bps N/A Equity derivative contracts (2) $ 21 Option pricing model Equity / Equity Index volatility 6% - 111% 41% Equity / Equity and Equity / Index correlation 45% - 97% 84% Equity forward price $41 - $6,245 $643 Credit derivative contracts $ 1 Option pricing model and, where applicable, discounted cash flows Credit default swap spreads 59bps - 1,558bps 160bps Other derivative contracts $ (35) Discounted cash flows Conversion rate 1.6 times N/A Expected duration 1.0 year N/A Asset-backed securities available-for-sale $ 104 Discounted cash flows Market assumptions related to yields for comparable instruments 2% - 3% 2% Loans held for sale $ 32 Market comparables and internal assumptions Adjusted market price 78% - 100% 90% Mortgage servicing rights $ 19 Discounted cash flows Constant prepayment rates 6% - 17% 6% Discount rate 10% - 14% 10% Estimated annualized costs to service $72 - $77 per account $74 per account Domestic deposits (structured deposits) (2)(3) $ (293) Option adjusted discounted cash flows Equity / Equity Index volatility 7% - 29% 13% Equity / Equity and Equity / Index correlation 51% - 93% 71% Long-term debt (structured notes) (2)(3) $ (1,919) Option adjusted discounted cash flows Equity / Equity Index volatility 7% - 95% 22% Equity / Equity and Equity / Index correlation 45% - 97% 84% Credit default swap spreads 948bps NA (1) For equity derivatives, credit derivatives, structured deposits and structured notes, weighted averages are calculated based on the fair value of the instruments. For all remaining instrument types, weighted averages are calculated based on the notional value of the instruments. (2) We are the client-facing entity and, except for structured notes and deposits with embedded credit derivative features, we enter into identical but opposite derivatives to transfer the resultant risks to our affiliates. With the exception of counterparty credit risks, we are market risk neutral in substantially all of the structured notes and deposits. The corresponding intra-group derivatives are presented as equity derivatives in the table. (3) Structured deposits and structured notes contain embedded derivative features whose fair value measurements contain significant Level 3 inputs. See equity derivatives and credit derivatives below for a discussion of the uncertainty of Level 3 inputs related to structured deposits and structured notes. N/A Not Applicable Uncertainty of Level 3 Inputs to Fair Value Measurements Interest rate derivatives - For mortgage rate lock commitments, the fair value measurement is affected by the probability of executing and funding the mortgage. An increase (decrease) in the likelihood of a mortgage being executed would have resulted in a lower (higher) fair value measurement of the interest rate derivative. For certain other interest rate derivatives, the interest rates for longer dated tenors were not observable. An increase (decrease) in the interest rate would have resulted in a higher (lower) fair value measurement of the derivative depending on if we receive or pay the floating rate. Foreign exchange derivatives - For certain foreign exchange derivatives, the cross-currency basis for longer dated tenors were not observable. An increase (decrease) in the cross-currency basis would have resulted in a higher (lower) fair value measurement of the derivative depending on if we receive or pay the floating rate plus the basis spread. Equity derivatives - For certain equity derivatives, particularly those with long-dated maturities and/or strike values far from at-the-money, volatility can be unobservable. A significant increase (decrease) in the implied volatility would have resulted in a higher (lower) fair value of a long position in the derivative contract. For a derivative referenced to a basket of equities, the fair value measurement is also affected by the correlation of the referenced equities. Correlation measures the relative change in values among two or more variables (i.e., equity pair), which can be positively or negatively correlated. The majority of the correlations are not observable. A significant increase (decrease) in the correlation of the referenced variables would have resulted in a higher (lower) fair value of a long position in the derivative contract. In addition, for the majority of unlisted equities and some listed equities, the forward price is unobservable. A significant increase (decrease) in the price would have resulted in a higher (lower) fair value of a long position in the derivative contract. Credit derivatives - The fair value measurement of certain credit derivatives is primarily affected by the credit spreads of credit default swap contracts. A significant increase (decrease) in the credit spreads would have resulted in a lower (higher) fair value measurement of the credit derivative. Other derivatives - The fair value of the swap agreements we entered into in conjunction with the sales of Visa Class B Shares is dependent upon the final resolution of the related litigation. Significant unobservable inputs used in the fair value measurement include estimated changes in the conversion rate of Visa Class B Shares into Visa Class A Shares and the expected timing of the final resolution. An increase (decrease) in the loss estimate or in the timing of the resolution of the related litigation would have resulted in a higher (lower) fair value measurement of the derivative. Asset-backed securities available-for-sale - The fair value measurement of certain asset-backed securities is primarily affected by estimated yields which are determined based on current market yields of comparable instruments adjusted for market liquidity. An increase (decrease) in the yields would have resulted in a lower (higher) fair value measurement of the securities. Loans held for sale - The fair value measurement of certain commercial loans held for sale is affected by estimated market prices which are unobservable. An increase (decrease) in the estimated prices would have resulted in a higher (lower) fair value measurement of the loans. Mortgage servicing rights - The fair value measurement of mortgage servicing rights is primarily affected by the estimated prepayment rates of the mortgage loans and the discount rates. An increase (decrease) in either of these inputs would have resulted in a lower (higher) fair value measurement of the mortgage servicing rights. Significant Transfers Into and Out of Level 3 Measurements During the three and nine months ended September 30, 2024, we transferred $53 million and $67 million, respectively, of domestic deposits and $166 million and $398 million, respectively, of long-term debt, which we have elected to carry at fair value, from Level 3 to Level 2 as a result of the embedded derivative no longer being unobservable as the derivative option is closer to maturity and there is more observability in short term volatility. During the three and nine months ended September 30, 2024, we also transferred $15 million and $19 million, respectively, of commercial loans held for sale and $12 million and $29 million, respectively, of equity derivatives from Level 3 to Level 2 as the inputs used to value these loans and derivative contracts have become more observable. During the three and nine months ended September 30, 2024, we transferred $3 million and $50 million, respectively, of long-term debt, which we elected to carry at fair value, from Level 2 to Level 3 as a result of a change in the observability of underlying inputs that resulted in the embedded derivative being unobservable. During the three and nine months ended September 30, 2024, we also transferred $43 million and $55 million, respectively, of commercial loans held for sale from Level 2 to Level 3 as the inputs used to value these loans have become less observable. During the three and nine months ended September 30, 2023, we transferred $1 million and $32 million, respectively, of domestic deposits and $197 million and $800 million, respectively, of long-term debt, which we have elected to carry at fair value, from Level 3 to Level 2 as a result of the embedded derivative no longer being unobservable as the derivative option is closer to maturity and there is more observability in short term volatility. During the three and nine months ended September 30, 2023, we transferred $48 million and $84 million, respectively, of long-term debt, which we elected to carry at fair value, from Level 2 to Level 3 as a result of a change in the observability of underlying inputs that resulted in the embedded derivative being unobservable. During the third quarter of 2023, we also transferred $36 million of commercial loans held for sale from Level 2 to Level 3 as the inputs used to value these loans have become less observable. Assets and Liabilities

Litigation and Regulatory Matte

Litigation and Regulatory Matters	9 Months Ended
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Litigation and Regulatory Matters	Litigation and Regulatory Matters The following supplements, and should be read together with, the disclosure in Note 30, "Litigation and Regulatory Matters," in our 2023 Form 10-K and in Note 18, "Litigation and Regulatory Matters," in our Form 10-Q for the three-month period ended March 31, 2024 (the "2024 First Quarter Form 10-Q") and the six-month period ended June 30, 2024 (the "2024 Second Quarter Form 10-Q"). Only those matters with significant updates and new matters since our disclosure in our 2023 Form 10-K, our 2024 First Quarter Form 10-Q and our 2024 Second Quarter Form 10-Q are reported herein. In addition to the matters described below and in our 2023 Form 10-K, our 2024 First Quarter Form 10-Q and our 2024 Second Quarter Form 10-Q, in the ordinary course of business, we are routinely named as defendants in, or as parties to, various legal actions and proceedings relating to activities of our current and/or former operations. These legal actions and proceedings may include claims for substantial or indeterminate compensatory or punitive damages, or for injunctive relief. In the ordinary course of business, we also are subject to governmental and regulatory examinations, information-gathering requests, investigations and proceedings (both formal and informal), certain of which may result in adverse judgments, settlements, fines, penalties, injunctions or other relief. In connection with formal and informal inquiries by these regulators, we receive numerous requests, subpoenas and orders seeking documents, testimony and other information in connection with various aspects of our regulated activities. Due to the inherent unpredictability of legal matters, including litigation, governmental and regulatory matters, particularly where the damages sought are substantial or indeterminate or when the proceedings or investigations are in the early stages, we cannot determine with any degree of certainty the timing or ultimate resolution of such matters or the eventual loss, fines, penalties or business impact, if any, that may result. We establish reserves for litigation, governmental and regulatory matters when those matters present loss contingencies that are both probable and can be reasonably estimated. Once established, reserves are adjusted from time to time, as appropriate, in light of additional information. The actual costs of resolving litigation and regulatory matters, however, may be substantially higher than the amounts reserved for those matters. Some of our exposure may be offset by applicable insurance coverage. We do not consider the possible availability of insurance coverage in determining the amounts of any accruals (although we record the amount of related insurance recoveries that are deemed probable up to the amount of the accrual). For the legal matters disclosed below, including litigation and governmental and regulatory matters, as well as for the legal matters disclosed in Note 30, "Litigation and Regulatory Matters," in our 2023 Form 10-K and in Note 18, "Litigation and Regulatory Matters," in our 2024 First Quarter Form 10-Q and our 2024 Second Quarter Form 10-Q, as to which a loss in excess of accrued liability is reasonably possible in future periods and for which there is sufficient currently available information on the basis of which management believes it can make a reliable estimate, we believe a reasonable estimate could be as much as $100 million for HUSI. The legal matters underlying this estimate of possible loss will change from time to time and actual results may differ significantly from this current estimate. Given the substantial or indeterminate amounts sought in certain of these matters, and the inherent unpredictability of such matters, an adverse outcome in certain of these matters could have a material adverse effect on our consolidated financial statements in any particular quarterly or annual period. Foreign Exchange ("FX") Matters Plaintiffs did not seek further appeal from dismissal of Nypl v. JPMorgan Chase, et al.; (Case No. 1:15-CV-9300). Precious Metals Fix Matters Platinum and Palladium Fix Litigation

New Accounting Pronouncements

New Accounting Pronouncements	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements The following are new accounting pronouncements issued by the Financial Accounting Standards Board which will be adopted in future periods: Accounting Standards Update Summary of Guidance Financial Statement Impact Improvements to Reportable Segment Disclosures Issued November 2023 • Amends and adds certain disclosure requirements for reportable segments. • In particular, requires disclosure of a) significant segment expenses that are regularly provided to the chief operating decision maker ("CODM") and included within the reported measure of segment profit or loss; b) the title and position of the CODM; and c) an explanation of how the CODM uses the reported measure of segment profit or loss in assessing segment performance and deciding how to allocate resources. • Effective for annual periods beginning January 1, 2024, and interim periods beginning January 1, 2025. • The new guidance is required to be applied retrospectively. • While the adoption of this guidance will result in changes to existing disclosures, it will not have any impact on our financial position or results of operations. Improvements to Income Tax Disclosures Issued December 2023 • Eliminates, amends and adds certain disclosure requirements for income taxes. • In particular, requires the disaggregation of certain existing disclosures, including a) the effective tax rate reconciliation to be broken out into specific categories; b) income taxes paid and income tax expense to be broken out between federal, state and foreign; and c) income before income tax to be broken out between domestic and foreign. • Effective for annual periods beginning January 1, 2025, with early adoption permitted. • The new guidance should be applied prospectively, with a retrospective option. • While the adoption of this guidance will result in changes to existing disclosures, it will not have any impact on our financial position or results of operations. There have been no additional accounting pronouncements issued that are expected to have a material impact on our consolidated financial statements.

Fair Value Measures and Disclos

Fair Value Measures and Disclosures (Policies)	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value Hierarchy	Fair Value Hierarchy The Fair Value Framework establishes a three-tiered fair value hierarchy as follows: Level 1 quoted market price - Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 valuation technique using observable inputs - Level 2 inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are inactive, and measurements determined using valuation models where all significant inputs are observable, such as interest rates and yield curves that are observable at commonly quoted intervals. Level 3 valuation technique with significant unobservable inputs - Level 3 inputs are unobservable inputs for the asset or liability and include situations where fair values are measured using valuation techniques based on one or more significant unobservable inputs. Classification within the fair value hierarchy is based on whether the lowest hierarchical level input that is significant to the fair value measurement is observable. As such, the classification within the fair value hierarchy is dynamic and can be transferred to other hierarchy levels in each reporting period. Where fair value measurements are determined based on information obtained from independent pricing services or brokers, we apply appropriate validation procedures to substantiate fair value. For price validation purposes, quotations from at least two independent pricing sources are obtained for each financial instrument, where possible. The following factors are considered in determining fair values: • similarities between the asset or the liability under consideration and the asset or liability for which quotation is received; • collaboration of pricing by referencing to other independent market data such as market transactions and relevant benchmark indices; • consistency among different pricing sources; • the valuation approach and the methodologies used by the independent pricing sources in determining fair value; • the elapsed time between the date to which the market data relates and the measurement date; • the source of the fair value information; and • whether the security is traded in an active or inactive market. Greater weight is given to quotations of instruments with recent market transactions, pricing quotes from dealers who stand ready to transact, quotations provided by market-makers who structured such instrument and market consensus pricing based on inputs from a large number of survey participants. Any significant discrepancies among the external quotations are reviewed and adjustments to fair values are recorded where appropriate. Where the transaction volume of a specific instrument has been reduced and the fair value measurement becomes less transparent, we will apply more detailed procedures to understand and challenge the appropriateness of the unobservable inputs and the valuation techniques used by the independent pricing service. Where applicable, we will develop a fair value estimate using our own pricing model inputs to test reasonableness. Where fair value measurements are determined using internal valuation models, we will validate the fair value measurement by either developing unobservable inputs based on the industry consensus pricing surveys in which we participate or back testing by observing the actual settlements occurring soon after the measurement date.

Trading Assets and Liabilities

Trading Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2024
Trading Assets And Liabilities [Abstract]
Trading Assets and Liabilities	Trading assets and liabilities consisted of the following: September 30, 2024 December 31, 2023 (in millions) Trading assets: U.S. Treasury $ 4,038 $ 3,564 U.S. Government agency issued or guaranteed 1 1 U.S. Government sponsored enterprises 1,228 1,207 Foreign bonds 759 4,019 Equity securities 14,344 11,702 Precious metals 160 346 Derivatives, net 1,177 1,276 Total trading assets $ 21,707 $ 22,115 Trading liabilities: Securities sold, not yet purchased $ 1,528 $ 1,688 Payables for precious metals 238 301 Derivatives, net 1,071 1,496 Total trading liabilities $ 2,837 $ 3,485

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Fair Value of the Securities Available-for-Sale and Held-to-Maturity	Our securities available-for-sale and securities held-to-maturity portfolios consisted of the following: September 30, 2024 Amortized Allowance for Credit Losses Unrealized Unrealized Fair (in millions) Securities available-for-sale: U.S. Treasury $ 9,318 $ — $ 13 $ (219) $ 9,112 U.S. Government sponsored enterprises: Mortgage-backed securities 3,325 — — (565) 2,760 Collateralized mortgage obligations 1,349 — — (265) 1,084 Direct agency obligations 1,406 — 1 (7) 1,400 U.S. Government agency issued or guaranteed: Mortgage-backed securities 5,430 — 2 (318) 5,114 Collateralized mortgage obligations 2,668 — — (438) 2,230 Direct agency obligations 167 — 3 — 170 Asset-backed securities collateralized by: Home equity 11 — — (1) 10 Other 102 — — (10) 92 Foreign debt securities (1) 3,970 — 1 (1) 3,970 Total available-for-sale securities $ 27,746 $ — $ 20 $ (1,824) $ 25,942 Securities held-to-maturity: U.S. Treasury $ 2,797 $ — $ 7 $ (6) $ 2,798 U.S. Government sponsored enterprises: Mortgage-backed securities 1,020 — — (46) 974 Collateralized mortgage obligations 257 — 4 (10) 251 U.S. Government agency issued or guaranteed: Mortgage-backed securities 11,594 — 92 (130) 11,556 Collateralized mortgage obligations 1,567 — — (113) 1,454 Obligations of U.S. states and political subdivisions 3 — — — 3 Total held-to-maturity securities $ 17,238 $ — $ 103 $ (305) $ 17,036 December 31, 2023 Amortized Allowance for Credit Losses Unrealized Unrealized Fair (in millions) Securities available-for-sale: U.S. Treasury $ 7,489 $ — $ 22 $ (225) $ 7,286 U.S. Government sponsored enterprises: Mortgage-backed securities 5,864 — — (845) 5,019 Collateralized mortgage obligations 1,436 — — (300) 1,136 Direct agency obligations 1,719 — — (38) 1,681 U.S. Government agency issued or guaranteed: Mortgage-backed securities 5,804 — 1 (378) 5,427 Collateralized mortgage obligations 2,865 — — (506) 2,359 Direct agency obligations 215 — 3 (3) 215 Asset-backed securities collateralized by: Home equity 13 — — (1) 12 Other 103 — — (11) 92 Foreign debt securities (1) 2,472 — — (3) 2,469 Total available-for-sale securities $ 27,980 $ — $ 26 $ (2,310) $ 25,696 Securities held-to-maturity: U.S. Treasury $ 1,917 $ — $ 1 $ (18) $ 1,900 U.S. Government sponsored enterprises: Mortgage-backed securities 1,069 — — (68) 1,001 Collateralized mortgage obligations 297 — 3 (16) 284 U.S. Government agency issued or guaranteed: Mortgage-backed securities 10,043 — 43 (180) 9,906 Collateralized mortgage obligations 1,745 — — (152) 1,593 Obligations of U.S. states and political subdivisions 4 — — — 4 Asset-backed securities collateralized by residential mortgages 1 — — — 1 Total held-to-maturity securities $ 15,076 $ — $ 47 $ (434) $ 14,689 (1) Foreign debt securities represent public sector entity, bank or corporate debt.
Gross Unrealized Losses and Related Fair Value	The following table summarizes gross unrealized losses and related fair values for securities available-for-sale by major security type at September 30, 2024 and December 31, 2023 classified as to the length of time the losses have existed: One Year or Less Greater Than One Year Number Gross Aggregate Number Gross Aggregate (dollars are in millions) At September 30, 2024 U.S. Treasury 12 $ (9) $ 3,118 38 $ (210) $ 4,288 U.S. Government sponsored enterprises 1 — 71 143 (837) 4,735 U.S. Government agency issued or guaranteed — — — 137 (756) 6,794 Asset-backed securities — — — 6 (11) 103 Foreign debt securities 18 (1) 1,530 1 — 50 Securities available-for-sale 31 $ (10) $ 4,719 325 $ (1,814) $ 15,970 At December 31, 2023 U.S. Treasury 3 $ (1) $ 1,008 41 $ (224) $ 4,906 U.S. Government sponsored enterprises 2 — 80 293 (1,183) 7,701 U.S. Government agency issued or guaranteed — — — 151 (887) 7,765 Asset-backed securities — — — 6 (12) 104 Foreign debt securities 17 (1) 1,801 4 (2) 183 Securities available-for-sale 22 $ (2) $ 2,889 495 $ (2,308) $ 20,659
Realized Gains and Losses on Investment Securities Transactions Attributable to Available-for-Sale Securities	The following table summarizes realized gains and losses on investment securities transactions attributable to available-for-sale securities: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 (in millions) Gross realized gains $ 1 $ — $ 15 $ 3 Gross realized losses (149) — (153) — Net realized gains (losses) $ (148) $ — $ (138) $ 3
Distribution of Maturities of Debt Securities with the Approximate Yield of the Portfolio	The table below also reflects the distribution of maturities of debt securities held at September 30, 2024, together with the approximate yield of the portfolio. The yields shown are calculated by dividing annualized interest income, including the accretion of discounts and the amortization of premiums, by the amortized cost of securities outstanding at September 30, 2024. Within After One After Five After Ten Amount Yield Amount Yield Amount Yield Amount Yield (dollars are in millions) Available-for-sale: U.S. Treasury $ 243 .98 % $ 3,815 2.17 % $ 2,380 3.97 % $ 2,880 2.65 % U.S. Government sponsored enterprises 579 1.15 178 2.99 650 1.97 4,673 1.80 U.S. Government agency issued or guaranteed 20 .81 — — 2 4.65 8,243 2.92 Asset-backed securities — — 54 4.40 47 3.93 12 4.85 Foreign debt securities 1,825 .34 2,054 4.36 91 3.81 — — Total amortized cost $ 2,667 .58 % $ 6,101 2.95 % $ 3,170 3.55 % $ 15,808 2.54 % Total fair value $ 2,664 $ 6,057 $ 3,153 $ 14,068 Held-to-maturity: U.S. Treasury $ — — % $ 2,048 3.65 % $ 749 3.71 % $ — — % U.S. Government sponsored enterprises 84 2.30 219 2.82 610 3.70 364 2.86 U.S. Government agency issued or guaranteed — — 1 3.94 12 5.91 13,148 4.52 Obligations of U.S. states and political subdivisions 1 4.04 2 3.77 — — — — Total amortized cost $ 85 2.32 % $ 2,270 3.57 % $ 1,371 3.73 % $ 13,512 4.48 % Total fair value $ 85 $ 2,266 $ 1,346 $ 13,339
Equity Securities Not Classified as Trading	Equity securities that are not classified as trading and are included in other assets consisted of the following: September 30, 2024 December 31, 2023 (in millions) Equity securities carried at fair value $ 260 $ 270 Equity securities without readily determinable fair values 12 13

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Components of Loans	Loans consisted of the following: September 30, 2024 December 31, 2023 (in millions) Commercial loans: Real estate, including construction $ 6,795 $ 7,087 Business and corporate banking 16,420 15,724 Global banking (1) 10,573 10,725 Other commercial: Affiliates (2) 3,784 2,618 Other 3,543 3,803 Total other commercial 7,327 6,421 Total commercial 41,115 39,957 Consumer loans: Residential mortgages 20,235 18,341 Home equity mortgages 393 389 Credit cards 185 199 Other consumer (3) 86 101 Total consumer 20,899 19,030 Total loans $ 62,014 $ 58,987 (1) Represents large multinational firms including globally focused U.S. corporate and financial institutions, U.S. dollar lending to multinational banking clients managed by HSBC on a global basis and complex large business clients supported by Global Banking and Markets relationship managers. (2) See Note 12, "Related Party Transactions," for additional information regarding loans to HSBC affiliates. (3) Includes certain student loans that we have elected to designate under the fair value option and are therefore carried at fair value, which totaled $12 million and $15 million at September 30, 2024 and December 31, 2023, respectively. See Note 9, "Fair Value Option," for further details.
Summary of Past Due Status of Loans	The following table summarizes the past due status of our loans at September 30, 2024 and December 31, 2023. The aging of past due amounts is determined based on the contractual delinquency status of payments under the loan. An account is generally considered to be contractually delinquent when payments have not been made in accordance with the loan terms. Delinquency status is affected by customer account management policies and practices such as re-age, which results in the re-setting of the contractual delinquency status to current. Past Due Total Past Due 30 Days or More 30 - 89 Days 90+ Days Current (1) Total Loans (in millions) At September 30, 2024 Commercial loans: Real estate, including construction $ — $ 21 $ 21 $ 6,774 $ 6,795 Business and corporate banking 2 49 51 16,369 16,420 Global banking — 47 47 10,526 10,573 Other commercial 182 — 182 7,145 7,327 Total commercial 184 117 301 40,814 41,115 Consumer loans: Residential mortgages 172 96 268 19,967 20,235 Home equity mortgages 2 5 7 386 393 Credit cards 2 2 4 181 185 Other consumer 3 2 5 81 86 Total consumer 179 105 284 20,615 20,899 Total loans $ 363 $ 222 $ 585 $ 61,429 $ 62,014 At December 31, 2023 Commercial loans: Real estate, including construction $ — $ 206 $ 206 $ 6,881 $ 7,087 Business and corporate banking 1 3 4 15,720 15,724 Global banking — 1 1 10,724 10,725 Other commercial 350 — 350 6,071 6,421 Total commercial 351 210 561 39,396 39,957 Consumer loans: Residential mortgages 174 91 265 18,076 18,341 Home equity mortgages 12 3 15 374 389 Credit cards 3 3 6 193 199 Other consumer 3 2 5 96 101 Total consumer 192 99 291 18,739 19,030 Total loans $ 543 $ 309 $ 852 $ 58,135 $ 58,987 (1) Loans less than 30 days past due are presented as current.
Summary of Nonaccrual Loans and Accruing Receivables 90 Days or More Delinquent	Nonperforming loans, including nonaccrual loans and accruing loans contractually 90 days or more past due, consisted of the following: Nonaccrual Loans Accruing Loans Contractually Past Due 90 Days or More Nonaccrual Loans With No Allowance For Credit Losses (in millions) At September 30, 2024 Commercial loans: Real estate, including construction $ 304 $ — $ — Business and corporate banking 59 — 6 Global banking 230 — 43 Other commercial — — — Total commercial 593 — 49 Consumer loans: Residential mortgages (1)(2)(3) 162 — 82 Home equity mortgages (1)(2) 6 — 5 Credit cards — 2 — Other consumer — 2 — Total consumer 168 4 87 Total nonperforming loans $ 761 $ 4 $ 136 At December 31, 2023 Commercial loans: Real estate, including construction $ 229 $ — $ 40 Business and corporate banking 143 1 29 Global banking 49 — 48 Other commercial 3 — 2 Total commercial 424 1 119 Consumer loans: Residential mortgages (1)(2)(3) 172 — 81 Home equity mortgages (1)(2) 6 — 5 Credit cards — 3 — Other consumer — 2 — Total consumer 178 5 86 Total nonperforming loans $ 602 $ 6 $ 205 (1) At September 30, 2024 and December 31, 2023, nonaccrual consumer mortgage loans include $107 million and $108 million, respectively, of loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell. (2) Nonaccrual consumer mortgage loans include all loans which are 90 or more days contractually delinquent as well as loans discharged under Chapter 7 bankruptcy and not re-affirmed and second lien loans where the first lien loan that we own or service is 90 or more days contractually delinquent. (3) Nonaccrual consumer mortgage loans for all periods does not include guaranteed loans purchased from the Government National Mortgage Association. Repayment of these loans is predominantly insured by the Federal Housing Administration and as such, these loans have different risk characteristics from the rest of our consumer loan portfolio.
Summary of Modified Loans	The following table presents information about loan payment modifications made to borrowers experiencing financial difficulty during the three and nine months ended September 30, 2024 and 2023 by type of modification, including the period-end carrying value and as a percentage of total loans. During the three months ended September 30, 2024, loan payment modifications made to consumer borrowers experiencing financial difficulty were nil. Interest Rate Reduction Principal Forgiveness Term Extension / Significant Payment Deferral Combination (1) Total % of Total Loans (dollars are in millions) Three Months Ended September 30, 2024 Commercial loans: Real estate, including construction $ — $ 33 $ 43 $ — $ 76 1.1 % Business and corporate banking — — 6 — 6 .0 Total commercial — 33 49 — 82 .2 Interest Rate Reduction Principal Forgiveness Term Extension / Significant Payment Deferral Combination (1) Total % of Total Loans (dollars are in millions) Three Months Ended September 30, 2023 Commercial loans: Real estate, including construction $ — $ — $ 2 $ — $ 2 .0 % Business and corporate banking — — 53 — 53 .3 Total commercial — — 55 — 55 .1 Consumer loans: Residential mortgages (2) — — 2 — 2 .0 Total consumer — — 2 — 2 .0 Total $ — $ — $ 57 $ — $ 57 .1 Nine Months Ended September 30, 2024 Commercial loans: Real estate, including construction $ — $ 33 $ 43 $ 159 $ 235 3.5 % Business and corporate banking — — 37 5 42 .3 Global banking — — 35 — 35 .3 Total commercial — 33 115 164 312 .8 Consumer loans: Residential mortgages (2) — — — 1 1 .0 Total consumer — — — 1 1 .0 Total $ — $ 33 $ 115 $ 165 $ 313 .5 Nine Months Ended September 30, 2023 Commercial loans: Real estate, including construction $ — $ — $ 172 $ — $ 172 2.5 % Business and corporate banking — — 128 — 128 .8 Global banking — — 5 — 5 .1 Total commercial — — 305 — 305 .8 Consumer loans: Residential mortgages (2) — — 10 1 11 .1 Total consumer — — 10 1 11 .1 Total $ — $ — $ 315 $ 1 $ 316 .5 (1) Represents loans with more than one type of payment modification during the period. (2) The carrying values of consumer mortgage loans with a payment modification primarily includes loans that were recorded at the lower of amortized cost or fair value of the collateral less cost to sell. The following table summarizes the financial effect of loan payment modifications made to borrowers experiencing financial difficulty during the three and nine months ended September 30, 2024 and 2023 by type of modification: Weighted-Average Interest Rate Reduction Principal Forgiven Weighted-Average Term Extension / Payment Deferral Three Months Ended September 30, 2024 Commercial loans: Real estate, including construction — % $ — 2.2 Business and corporate banking — — 1.6 Three Months Ended September 30, 2023 Commercial loans: Real estate, including construction — % $ — 0.2 Business and corporate banking — — 1.1 Consumer loans: Residential mortgages — — 0.8 Nine Months Ended September 30, 2024 Commercial loans: Real estate, including construction 5.6 % $ — 3.1 Business and corporate banking .3 — 1.7 Global banking — — 2.0 Consumer loans: Residential mortgages .5 — 0.6 Nine Months Ended September 30, 2023 Commercial loans: Real estate, including construction — % $ — 0.4 Business and corporate banking — 2 1.9 Global banking — — 2.0 Consumer loans: Residential mortgages 2.2 — 2.0 The following table presents loans to borrowers experiencing financial difficulty with a payment modification during the previous 12 months which subsequently became 90 days or greater contractually delinquent during the three and nine months ended September 30, 2024 by type of modification: Interest Rate Reduction Principal Forgiveness Term Extension / Significant Payment Deferral Combination (1) Total (in millions) Nine Months Ended September 30, 2024 Commercial loans: Global banking $ — $ — $ 1 $ — $ 1 Total commercial $ — $ — $ 1 $ — $ 1 (1) Represents loans with more than one type of payment modification during the period.
Summary of Past Due Status of Loans with Payment Modification	The following table presents the past due status of loans to borrowers experiencing financial difficulty with a payment modification during the previous 12 months at September 30, 2024 and December 31, 2023: Past Due 30 - 89 Days 90+ Days Current (1) Total (in millions) At September 30, 2024 Commercial loans: Real estate, including construction $ — $ — $ 236 $ 236 Business and corporate banking — — 267 267 Global banking — — 74 74 Total commercial — — 577 577 Consumer loans: Residential mortgages 1 — 7 8 Total consumer 1 — 7 8 Total $ 1 $ — $ 584 $ 585 At December 31, 2023 Commercial loans: Real estate, including construction $ — $ 166 $ 2 $ 168 Business and corporate banking — — 398 398 Global banking — — 50 50 Total commercial — 166 450 616 Consumer loans: Residential mortgages — — 12 12 Total consumer — — 12 12 Total $ — $ 166 $ 462 $ 628 (1) Loans less than 30 days past due are presented as current.
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Summary of Criticized Commercial Loans	The following table summarizes our criticized commercial loans, including a disaggregation of the loans by year of origination as of September 30, 2024 and December 31, 2023: 2024 2023 2022 2021 2020 Prior Revolving Revolving Loans Converted to Term Loans Total at Sep. 30, 2024 (in millions) Real estate, including construction: Special mention $ — $ — $ 104 $ — $ — $ 18 $ — $ — $ 122 Substandard — — 64 — — 521 — — 585 Doubtful — — — 33 — 249 20 — 302 Total real estate, including construction — — 168 33 — 788 20 — 1,009 Business and corporate banking: Special mention 172 128 104 20 4 219 148 11 806 Substandard 138 118 44 43 — 157 593 6 1,099 Doubtful 6 6 — — — 6 40 — 58 Total business and corporate banking 316 252 148 63 4 382 781 17 1,963 Global banking: Special mention — — — — — — 37 — 37 Substandard — — — — 20 86 166 — 272 Doubtful — — — — — 180 9 — 189 Total global banking — — — — 20 266 212 — 498 Total commercial $ 316 $ 252 $ 316 $ 96 $ 24 $ 1,436 $ 1,013 $ 17 $ 3,470 Total commercial: Special mention $ 172 $ 128 $ 208 $ 20 $ 4 $ 237 $ 185 $ 11 $ 965 Substandard 138 118 108 43 20 764 759 6 1,956 Doubtful 6 6 — 33 — 435 69 — 549 Total commercial $ 316 $ 252 $ 316 $ 96 $ 24 $ 1,436 $ 1,013 $ 17 $ 3,470 2023 2022 2021 2020 2019 Prior Revolving Revolving Loans Converted to Term Loans Total at Dec. 31, 2023 (in millions) Real estate, including construction: Special mention $ — $ 40 $ — $ 104 $ 92 $ 42 $ 3 $ 3 $ 284 Substandard 2 — — 1 — 821 — — 824 Doubtful — — — — — 166 18 — 184 Total real estate, including construction 2 40 — 105 92 1,029 21 3 1,292 Business and corporate banking: Special mention 38 103 12 4 20 126 296 8 607 Substandard 31 22 — 27 — 156 746 1 983 Doubtful — — 36 — — 9 71 — 116 Total business and corporate banking 69 125 48 31 20 291 1,113 9 1,706 Global banking: Special mention — — — — — 45 62 — 107 Substandard — 14 — — — 114 73 — 201 Doubtful — 187 — — 14 — 1 — 202 Total global banking — 201 — — 14 159 136 — 510 Other commercial: Special mention 6 — — — — — — — 6 Substandard 38 — — — — — — — 38 Doubtful — — — — — — 3 — 3 Total other commercial 44 — — — — — 3 — 47 Total commercial $ 115 $ 366 $ 48 $ 136 $ 126 $ 1,479 $ 1,273 $ 12 $ 3,555 Total commercial: Special mention $ 44 $ 143 $ 12 $ 108 $ 112 $ 213 $ 361 $ 11 $ 1,004 Substandard 71 36 — 28 — 1,091 819 1 2,046 Doubtful — 187 36 — 14 175 93 — 505 Total commercial $ 115 $ 366 $ 48 $ 136 $ 126 $ 1,479 $ 1,273 $ 12 $ 3,555
Summary of Nonperforming Status	The following table summarizes the nonperforming status of our commercial loan portfolio, including a disaggregation of the loans by year of origination as of September 30, 2024 and December 31, 2023: 2024 2023 2022 2021 2020 Prior Revolving Revolving Loans Converted to Term Loans Total at Sep. 30, 2024 (in millions) Real estate, including construction: Performing loans $ 638 $ 1,039 $ 1,217 $ 850 $ 262 $ 2,464 $ 18 $ 3 $ 6,491 Nonaccrual loans — — — 33 — 251 20 — 304 Total real estate, including construction 638 1,039 1,217 883 262 2,715 38 3 6,795 Business and corporate banking: Performing loans 1,403 1,350 1,118 1,261 176 4,090 6,655 308 16,361 Nonaccrual loans 6 6 — — — 6 41 — 59 Total business and corporate banking 1,409 1,356 1,118 1,261 176 4,096 6,696 308 16,420 Global banking: Performing loans 935 1,768 849 660 116 4,274 1,741 — 10,343 Nonaccrual loans — — — — — 221 9 — 230 Total global banking 935 1,768 849 660 116 4,495 1,750 — 10,573 Other commercial: Performing loans 271 144 262 324 486 1,145 4,695 — 7,327 Nonaccrual loans — — — — — — — — — Total other commercial 271 144 262 324 486 1,145 4,695 — 7,327 Total commercial $ 3,253 $ 4,307 $ 3,446 $ 3,128 $ 1,040 $ 12,451 $ 13,179 $ 311 $ 41,115 Total commercial: Performing loans $ 3,247 $ 4,301 $ 3,446 $ 3,095 $ 1,040 $ 11,973 $ 13,109 $ 311 $ 40,522 Nonaccrual loans 6 6 — 33 — 478 70 — 593 Total commercial $ 3,253 $ 4,307 $ 3,446 $ 3,128 $ 1,040 $ 12,451 $ 13,179 $ 311 $ 41,115 2023 2022 2021 2020 2019 Prior Revolving Revolving Loans Converted to Term Loans Total at Dec. 31, 2023 (in millions) Real estate, including construction: Performing loans $ 920 $ 1,286 $ 1,019 $ 355 $ 1,014 $ 2,242 $ 19 $ 3 $ 6,858 Nonaccrual loans — — — — 40 167 22 — 229 Total real estate, including construction 920 1,286 1,019 355 1,054 2,409 41 3 7,087 Business and corporate banking: Performing loans 1,270 1,113 1,074 231 561 4,215 6,851 265 15,580 Nonaccrual loans — 35 — — — 38 70 — 143 Accruing loans contractually past due 90 days or more — — — — — — 1 — 1 Total business and corporate banking 1,270 1,148 1,074 231 561 4,253 6,922 265 15,724 Global banking: Performing loans 2,255 1,153 844 151 321 3,561 2,341 50 10,676 Nonaccrual loans — — — — — 39 10 — 49 Total global banking 2,255 1,153 844 151 321 3,600 2,351 50 10,725 Other commercial: Performing loans 211 281 313 651 418 804 3,740 — 6,418 Nonaccrual loans — — — — — 3 — — 3 Total other commercial 211 281 313 651 418 807 3,740 — 6,421 Total commercial $ 4,656 $ 3,868 $ 3,250 $ 1,388 $ 2,354 $ 11,069 $ 13,054 $ 318 $ 39,957 Total commercial: Performing loans $ 4,656 $ 3,833 $ 3,250 $ 1,388 $ 2,314 $ 10,822 $ 12,951 $ 318 $ 39,532 Nonaccrual loans — 35 — — 40 247 102 — 424 Accruing loans contractually past due 90 days or more — — — — — — 1 — 1 Total commercial $ 4,656 $ 3,868 $ 3,250 $ 1,388 $ 2,354 $ 11,069 $ 13,054 $ 318 $ 39,957
Summary of Credit Quality Indicators	The following table summarizes the credit risk profile of our commercial loan portfolio, including a disaggregation of the loans by year of origination as of September 30, 2024 and December 31, 2023: 2024 2023 2022 2021 2020 Prior Revolving Revolving Loans Converted to Term Loans Total at Sep. 30, 2024 (in millions) Real estate, including construction: Investment grade $ 66 $ 323 $ 26 $ — $ 166 $ 593 $ — $ — $ 1,174 Non-investment grade 572 716 1,191 883 96 2,122 38 3 5,621 Total real estate, including construction 638 1,039 1,217 883 262 2,715 38 3 6,795 Business and corporate banking: Investment grade 662 507 351 590 86 1,842 3,018 89 7,145 Non-investment grade 747 849 767 671 90 2,254 3,678 219 9,275 Total business and corporate banking 1,409 1,356 1,118 1,261 176 4,096 6,696 308 16,420 Global banking: Investment grade 811 1,448 751 558 96 3,714 1,438 — 8,816 Non-investment grade 124 320 98 102 20 781 312 — 1,757 Total global banking 935 1,768 849 660 116 4,495 1,750 — 10,573 Other commercial: Investment grade 171 95 136 30 357 845 4,469 — 6,103 Non-investment grade 100 49 126 294 129 300 226 — 1,224 Total other commercial 271 144 262 324 486 1,145 4,695 — 7,327 Total commercial $ 3,253 $ 4,307 $ 3,446 $ 3,128 $ 1,040 $ 12,451 $ 13,179 $ 311 $ 41,115 Total commercial: Investment grade $ 1,710 $ 2,373 $ 1,264 $ 1,178 $ 705 $ 6,994 $ 8,925 $ 89 $ 23,238 Non-investment grade 1,543 1,934 2,182 1,950 335 5,457 4,254 222 17,877 Total commercial $ 3,253 $ 4,307 $ 3,446 $ 3,128 $ 1,040 $ 12,451 $ 13,179 $ 311 $ 41,115 2023 2022 2021 2020 2019 Prior Revolving Revolving Loans Converted to Term Loans Total at Dec. 31, 2023 (in millions) Real estate, including construction: Investment grade $ 327 $ 100 $ 24 $ 187 $ 162 $ 939 $ 1 $ — $ 1,740 Non-investment grade 593 1,186 995 168 892 1,470 40 3 5,347 Total real estate, including construction 920 1,286 1,019 355 1,054 2,409 41 3 7,087 Business and corporate banking: Investment grade 732 304 543 95 261 1,977 3,311 54 7,277 Non-investment grade 538 844 531 136 300 2,276 3,611 211 8,447 Total business and corporate banking 1,270 1,148 1,074 231 561 4,253 6,922 265 15,724 Global banking: Investment grade 1,947 1,109 651 149 307 2,842 2,140 — 9,145 Non-investment grade 308 44 193 2 14 758 211 50 1,580 Total global banking 2,255 1,153 844 151 321 3,600 2,351 50 10,725 Other commercial: Investment grade 211 192 43 376 298 564 3,143 — 4,827 Non-investment grade — 89 270 275 120 243 597 — 1,594 Total other commercial 211 281 313 651 418 807 3,740 — 6,421 Total commercial $ 4,656 $ 3,868 $ 3,250 $ 1,388 $ 2,354 $ 11,069 $ 13,054 $ 318 $ 39,957 Total commercial: Investment grade $ 3,217 $ 1,705 $ 1,261 $ 807 $ 1,028 $ 6,322 $ 8,595 $ 54 $ 22,989 Non-investment grade 1,439 2,163 1,989 581 1,326 4,747 4,459 264 16,968 Total commercial $ 4,656 $ 3,868 $ 3,250 $ 1,388 $ 2,354 $ 11,069 $ 13,054 $ 318 $ 39,957 2024 2023 2022 2021 2020 Prior Revolving Revolving Loans Converted to Term Loans Total (in millions) Nine Months Ended September 30, 2024 Business and corporate banking $ — $ — $ — $ 32 $ — $ 21 $ 1 $ — $ 54 Global banking — — — — — 3 — — 3 Total commercial $ — $ — $ — $ 32 $ — $ 24 $ 1 $ — $ 57 2023 2022 2021 2020 2019 Prior Revolving Revolving Loans Converted to Term Loans Total (in millions) Nine Months Ended September 30, 2023 Business and corporate banking $ — $ — $ 17 $ — $ — $ 9 $ 14 $ — $ 40 Total commercial $ — $ — $ 17 $ — $ — $ 9 $ 14 $ — $ 40
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Summary of Nonperforming Status	The following table summarizes the nonperforming status of our consumer loan portfolio, including a disaggregation of the loans by year of origination as of September 30, 2024 and December 31, 2023: 2024 2023 2022 2021 2020 Prior Revolving Total at Sep. 30, 2024 (in millions) Residential mortgages: Performing loans $ 2,996 $ 2,443 $ 2,653 $ 3,958 $ 2,639 $ 5,384 $ — $ 20,073 Nonaccrual loans — — 7 7 10 138 — 162 Total residential mortgages 2,996 2,443 2,660 3,965 2,649 5,522 — 20,235 Home equity mortgages: Performing loans 38 80 67 9 18 175 — 387 Nonaccrual loans — — — — — 6 — 6 Total home equity mortgages 38 80 67 9 18 181 — 393 Credit cards: Performing loans — — — — — — 183 183 Accruing loans contractually past due 90 days or more — — — — — — 2 2 Total credit cards — — — — — — 185 185 Other consumer: Performing loans — — 4 10 5 60 5 84 Accruing loans contractually past due 90 days or more — — — — — 2 — 2 Total other consumer — — 4 10 5 62 5 86 Total consumer $ 3,034 $ 2,523 $ 2,731 $ 3,984 $ 2,672 $ 5,765 $ 190 $ 20,899 Total consumer: Performing loans $ 3,034 $ 2,523 $ 2,724 $ 3,977 $ 2,662 $ 5,619 $ 188 $ 20,727 Nonaccrual loans — — 7 7 10 144 — 168 Accruing loans contractually past due 90 days or more — — — — — 2 2 4 Total consumer $ 3,034 $ 2,523 $ 2,731 $ 3,984 $ 2,672 $ 5,765 $ 190 $ 20,899 2023 2022 2021 2020 2019 Prior Revolving Total at Dec. 31, 2023 (in millions) Residential mortgages: Performing loans $ 2,646 $ 2,753 $ 4,096 $ 2,761 $ 1,236 $ 4,677 $ — $ 18,169 Nonaccrual loans — 11 11 9 8 133 — 172 Total residential mortgages 2,646 2,764 4,107 2,770 1,244 4,810 — 18,341 Home equity mortgages: Performing loans 80 69 11 22 25 176 — 383 Nonaccrual loans — — — — — 6 — 6 Total home equity mortgages 80 69 11 22 25 182 — 389 Credit cards: Performing loans — — — — — — 196 196 Accruing loans contractually past due 90 days or more — — — — — — 3 3 Total credit cards — — — — — — 199 199 Other consumer: Performing loans — 8 7 7 3 67 7 99 Accruing loans contractually past due 90 days or more — — — — — 2 — 2 Total other consumer — 8 7 7 3 69 7 101 Total consumer $ 2,726 $ 2,841 $ 4,125 $ 2,799 $ 1,272 $ 5,061 $ 206 $ 19,030 Total consumer: Performing loans $ 2,726 $ 2,830 $ 4,114 $ 2,790 $ 1,264 $ 4,920 $ 203 $ 18,847 Nonaccrual loans — 11 11 9 8 139 — 178 Accruing loans contractually past due 90 days or more — — — — — 2 3 5 Total consumer $ 2,726 $ 2,841 $ 4,125 $ 2,799 $ 1,272 $ 5,061 $ 206 $ 19,030
Summary of Credit Quality Indicators	The following table summarizes dollars of two-months-and-over contractual delinquency for our consumer loan portfolio, including a disaggregation of the loans by year of origination as of September 30, 2024 and December 31, 2023: 2024 2023 2022 2021 2020 Prior Revolving Total at Sep. 30, 2024 (in millions) Residential mortgages (1)(2) $ — $ 1 $ 9 $ 4 $ 9 $ 104 $ — $ 127 Home equity mortgages (1)(2) — — — — — 5 — 5 Credit cards — — — — — — 4 4 Other consumer — — — — 1 2 — 3 Total consumer $ — $ 1 $ 9 $ 4 $ 10 $ 111 $ 4 $ 139 2023 2022 2021 2020 2019 Prior Revolving Total at Dec. 31, 2023 (in millions) Residential mortgages (1)(2) $ — $ 2 $ 6 $ 6 $ 1 $ 100 $ — $ 115 Home equity mortgages (1)(2) — — — — — 4 — 4 Credit cards — — — — — — 4 4 Other consumer — — — — — 2 — 2 Total consumer $ — $ 2 $ 6 $ 6 $ 1 $ 106 $ 4 $ 125 (1) At September 30, 2024 and December 31, 2023, consumer mortgage loan delinquency includes $69 million and $61 million, respectively, of loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell. (2) At September 30, 2024 and December 31, 2023, consumer mortgage loans include $33 million and $21 million, respectively, of loans that were in the process of foreclosure. 2024 2023 2022 2021 2020 Prior Revolving Total (in millions) Nine Months Ended September 30, 2024 Credit cards $ — $ — $ — $ — $ — $ — $ 6 $ 6 Other consumer — — — — — 1 — 1 Total consumer $ — $ — $ — $ — $ — $ 1 $ 6 $ 7 2023 2022 2021 2020 2019 Prior Revolving Total (in millions) Nine Months Ended September 30, 2023 Residential mortgages $ — $ — $ — $ — $ — $ 4 $ — $ 4 Home equity mortgages — — — — — 1 — 1 Credit cards — — — — — — 6 6 Other consumer — — — — — 1 — 1 Total consumer $ — $ — $ — $ — $ — $ 6 $ 6 $ 12

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2024
Credit Loss [Abstract]
Forecasted Key Macroeconomic Variables Used in Estimating Lifetime ECL	The following table presents the forecasted key macroeconomic variables in our Central scenarios used for estimating lifetime ECL at September 30, 2024, June 30, 2024 and December 31, 2023: For the Quarter Ended December 31, 2024 June 30, 2025 December 31, 2025 Unemployment rate (quarterly average): Forecast at September 30, 2024 4.3 % 4.4 % 4.3 % Forecast at June 30, 2024 4.1 4.1 4.1 Forecast at December 31, 2023 4.3 4.2 4.1 GDP growth rate (year-over-year): Forecast at September 30, 2024 1.6 1.4 2.0 Forecast at June 30, 2024 1.8 1.7 1.7 Forecast at December 31, 2023 1.1 1.8 2.1
Summary of Allowance for Credit Losses and Liability for Off-balance Sheet Credit Exposures	The following table summarizes our allowance for credit losses and the liability for off-balance sheet credit exposures: September 30, 2024 December 31, 2023 (in millions) Allowance for credit losses: Loans $ 547 $ 591 Securities held-to-maturity (1) — — Other financial assets measured at amortized cost (2) — — Securities available-for-sale (1) — — Total allowance for credit losses $ 547 $ 591 Liability for off-balance sheet credit exposures $ 135 $ 111 (1) See Note 3, "Securities," for additional information regarding the allowance for credit losses associated with our security portfolios. (2) Primarily includes accrued interest receivables and customer acceptances.
Summary of Changes in the Allowance for Credit Losses by Product Line	The following table summarizes the changes in the allowance for credit losses on loans by product or line of business during the three and nine months ended September 30, 2024 and 2023: Commercial Loans Consumer Loans Real Estate, including Construction Business Global Other Residential Home Credit Other Total Loans (in millions) Three Months Ended September 30, 2024 Allowance for credit losses – beginning of period $ 145 $ 300 $ 121 $ 1 $ (7) $ 7 $ 13 $ 3 $ 583 Provision charged (credited) to income 17 (33) (15) — (2) 1 1 1 (30) Charge-offs — (5) — — — — (2) (1) (8) Recoveries — — — — 1 — 1 — 2 Net (charge-offs) recoveries — (5) — — 1 — (1) (1) (6) Allowance for credit losses – end of period $ 162 $ 262 $ 106 $ 1 $ (8) $ 8 $ 13 $ 3 $ 547 Three Months Ended September 30, 2023 Allowance for credit losses – beginning of period $ 146 $ 295 $ 151 $ 1 $ (13) $ 7 $ 15 $ 3 $ 605 Provision charged (credited) to income (3) 24 (21) — 2 (1) 2 (1) 2 Charge-offs — (34) — — — — (2) — (36) Recoveries — 3 — — — 1 1 — 5 Net (charge-offs) recoveries — (31) — — — 1 (1) — (31) Allowance for credit losses – end of period $ 143 $ 288 $ 130 $ 1 $ (11) $ 7 $ 16 $ 2 $ 576 Nine Months Ended September 30, 2024 Allowance for credit losses – beginning of period $ 144 $ 302 $ 127 $ 1 $ (9) $ 7 $ 16 $ 3 $ 591 Provision charged (credited) to income 18 13 (18) — (2) — — 1 12 Charge-offs — (54) (3) — — — (6) (1) (64) Recoveries — 1 — — 3 1 3 — 8 Net (charge-offs) recoveries — (53) (3) — 3 1 (3) (1) (56) Allowance for credit losses – end of period $ 162 $ 262 $ 106 $ 1 $ (8) $ 8 $ 13 $ 3 $ 547 Nine Months Ended September 30, 2023 Allowance for credit losses – beginning of period $ 200 $ 230 $ 120 $ 1 $ 11 $ 2 $ 16 $ 4 $ 584 Provision charged (credited) to income (57) 93 10 — (20) 4 3 (1) 32 Charge-offs — (40) — — (4) (1) (6) (1) (52) Recoveries — 5 — — 2 2 3 — 12 Net (charge-offs) recoveries — (35) — — (2) 1 (3) (1) (40) Allowance for credit losses – end of period $ 143 $ 288 $ 130 $ 1 $ (11) $ 7 $ 16 $ 2 $ 576
Summary of Changes in the Liability for Off-balance Sheet Credit Exposures	The following table summarizes the changes in the liability for off-balance sheet credit exposures during the three and nine months ended September 30, 2024 and 2023: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 (in millions) Balance at beginning of period $ 118 $ 143 $ 111 $ 117 Provision charged (credited) to income 17 (10) 24 16 Balance at end of period $ 135 $ 133 $ 135 $ 133
Summary of Accrued Interest Receivables	The following table summarizes accrued interest receivables associated with financial assets carried at amortized cost and securities available-for-sale along with the related allowance for credit losses, which are reported net in other assets on the consolidated balance sheet. These accrued interest receivables are excluded from the amortized cost basis disclosures presented elsewhere in these financial statements, including Note 3, "Securities," and Note 4, "Loans." September 30, 2024 December 31, 2023 (in millions) Accrued interest receivables: Loans $ 253 $ 259 Securities held-to-maturity 67 57 Other financial assets measured at amortized cost 49 19 Securities available-for-sale 112 87 Total accrued interest receivables 481 422 Allowance for credit losses — — Accrued interest receivables, net $ 481 $ 422

Loans Held for Sale (Tables)

Loans Held for Sale (Tables)	9 Months Ended
	Sep. 30, 2024
Receivables [Abstract]
Loans Held for Sale	Loans held for sale consisted of the following: September 30, 2024 December 31, 2023 (in millions) Commercial loans: Real estate, including construction $ 40 $ — Business and corporate banking 12 — Global banking 690 339 Total commercial 742 339 Consumer loans: Residential mortgages 2 — Total consumer 2 — Total loans held for sale $ 744 $ 339

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The following table presents the fair value of derivative contracts by major product type on a gross basis. Gross fair values exclude the effects of both counterparty netting as well as collateral, and therefore are not representative of our exposure. The table below also presents the amounts of counterparty netting and cash collateral that have been offset in the consolidated balance sheet, as well as cash and securities collateral posted and received under enforceable master netting agreements that do not meet the criteria for netting. Derivative assets and liabilities which are not subject to an enforceable master netting agreement, or are subject to a netting agreement where an appropriate legal opinion to determine such agreements are enforceable has not been either sought or obtained, have not been netted in the following table. Where we have received or posted collateral under netting agreements where an appropriate legal opinion to determine such agreements are enforceable has not been either sought or obtained, the related collateral also has not been netted in the following table. September 30, 2024 December 31, 2023 Derivative Assets Derivative Liabilities Derivative Assets Derivative Liabilities (in millions) Derivatives accounted for as fair value hedges: (1) Interest rate contracts - bilateral OTC (2) $ 2 $ 2 $ — $ 83 Derivatives accounted for as cash flow hedges: (1) Foreign exchange contracts - bilateral OTC (2) 4 62 — 56 Interest rate contracts - bilateral OTC (2) — 2 — 1 Total derivatives accounted for as hedges 6 66 — 140 Trading derivatives not accounted for as hedges: (3) Exchange-traded (2) 7 1 7 16 OTC-cleared (2) 101 — 70 — Bilateral OTC (2) 797 691 1,178 946 Interest rate contracts 905 692 1,255 962 OTC-cleared (2) 86 — — — Bilateral OTC (2) 9,483 9,623 13,606 13,479 Foreign exchange contracts 9,569 9,623 13,606 13,479 Exchange-traded (2) 5 — 7 — Bilateral OTC (2) 390 1,148 413 1,080 Equity contracts 395 1,148 420 1,080 Exchange-traded (2) — — 3 — Bilateral OTC (2) 1,288 1,271 1,150 1,033 Precious metals contracts 1,288 1,271 1,153 1,033 OTC-cleared (2) — — 14 — Bilateral OTC (2) 111 137 81 137 Credit contracts 111 137 95 137 Other non-qualifying derivatives not accounted for as hedges: (1) Interest rate contracts - bilateral OTC (2) — 62 — 76 Equity contracts - bilateral OTC (2) 536 116 621 193 OTC-cleared (2) — — 1 1 Bilateral OTC (2) 11 128 13 122 Credit contracts 11 128 14 123 Other contracts - bilateral OTC (2)(4) 11 56 5 40 Total derivatives 12,832 13,299 17,169 17,263 Less: Gross amounts of receivable / payable subject to enforceable master netting agreements (5)(7) 10,428 10,428 14,110 14,110 Less: Gross amounts of cash collateral received / posted subject to enforceable master netting agreements (6)(7) 1,170 1,511 1,760 1,321 Net amounts of derivative assets / liabilities presented in the balance sheet 1,234 1,360 1,299 1,832 Less: Gross amounts of financial instrument collateral received / posted subject to enforceable master netting agreements but not offset in the consolidated balance sheet 151 36 63 273 Net amounts of derivative assets / liabilities $ 1,083 $ 1,324 $ 1,236 $ 1,559 (1) Derivative assets / liabilities related to cash flow hedges, fair value hedges and derivative instruments held for purposes other than for trading are recorded in other assets other liabilities (2) Over-the-counter ("OTC") derivatives include derivatives executed and settled bilaterally with counterparties without the use of an organized exchange or central clearing house. The credit risk associated with bilateral OTC derivatives is managed through obtaining collateral and enforceable master netting agreements. OTC-cleared derivatives are executed bilaterally in the OTC market but then novated to a central clearing counterparty, whereby the central clearing counterparty becomes the counterparty to each of the original counterparties. Exchange traded derivatives are executed directly on an organized exchange. Credit risk is minimized for OTC-cleared derivatives and exchange traded derivatives through daily margining requirements. In addition, OTC-cleared interest rate and credit derivatives with certain central clearing counterparties are settled daily. (3) Trading related derivative assets / liabilities are recorded in trading assets / trading liabilities on the consolidated balance sheet. (4) Consists of swap agreements entered into in conjunction with the sales of Visa Inc. ("Visa") Class B common shares ("Class B Shares"). (5) Represents the netting of derivative receivable and payable balances for the same counterparty under enforceable netting agreements. (6) Represents the netting of cash collateral posted and received by counterparty under enforceable netting agreements. (7) Netting is performed at a counterparty level in cases where enforceable master netting agreements are in place, regardless of the type of derivative instrument. Therefore, we have not allocated netting to the different types of derivative instruments shown in the table above.
Schedule of Gains and Losses on Fair Value Hedging Instruments	The following table presents the carrying amount of hedged items in fair value hedges recognized in the consolidated balance sheet at September 30, 2024 and December 31, 2023, along with the cumulative amount of fair value hedging adjustments included in the carrying amount of those hedged items: Carrying Amount of Hedged Items (1) Cumulative Amount of Fair Value Hedging Adjustments Increasing (Decreasing) the Active Discontinued Total (in millions) At September 30, 2024 Securities available-for-sale ("AFS") $ 12,958 $ (1,024) $ (41) $ (1,065) Deposits 1,483 (62) 44 (18) Long-term debt 8,320 (221) 42 (179) At December 31, 2023 Securities AFS 11,112 (1,320) (70) (1,390) Deposits 1,463 (104) 67 (37) Long-term debt 7,913 (407) 72 (335) (1) The carrying amount of securities AFS represents the amortized cost basis. The following table presents information on gains and losses on derivative instruments designated and qualifying as hedging instruments and the hedged items in fair value hedges and their location on the consolidated statement of income: Location of Gain (Loss) Gain (Loss) on Derivatives Gain (Loss) on Hedged Items (in millions) Three Months Ended September 30, 2024 Interest rate contracts / Securities AFS Net interest income $ (405) $ 617 Interest rate contracts / Deposits Net interest income 40 (53) Interest rate contracts / Long-term debt Net interest income 114 (274) Total $ (251) $ 290 Three Months Ended September 30, 2023 Interest rate contracts / Securities AFS Net interest income $ 735 $ (550) Interest rate contracts / Deposits Net interest income (15) (20) Interest rate contracts / Long-term debt Net interest income (83) (45) Total $ 637 $ (615) Nine Months Ended September 30, 2024 Interest rate contracts / Securities AFS Net interest income $ 67 $ 504 Interest rate contracts / Deposits Net interest income 9 (92) Interest rate contracts / Long-term debt Net interest income (19) (432) Total $ 57 $ (20) Nine Months Ended September 30, 2023 Interest rate contracts / Securities AFS Net interest income $ 927 $ (384) Interest rate contracts / Deposits Net interest income (42) (58) Interest rate contracts / Long-term debt Net interest income (153) (192) Total $ 732 $ (634)
Schedule of Gains and Losses on Cash Flow Hedging Instruments	The following table presents information on gains and losses on derivative instruments designated and qualifying as hedging instruments in cash flow hedges (including amounts recognized in AOCI from discontinued cash flow hedges) and their location on the consolidated statement of income: Gain (Loss) Recognized in Location of Gain (Loss) Gain (Loss) Reclassified From 2024 2023 2024 2023 (in millions) Three Months Ended September 30, Foreign exchange contracts $ 6 $ — Net interest income $ — $ — Interest rate contracts (170) 27 Net interest income (22) (53) Total $ (164) $ 27 $ (22) $ (53) Nine Months Ended September 30, Foreign exchange contracts $ 5 $ — Net interest income $ — $ — Interest rate contracts (107) (8) Net interest income (45) (153) Total $ (102) $ (8) $ (45) $ (153)
Schedule of Gains and Losses on Derivative Instruments Included in Trading Activities	The following table presents information on gains and losses on derivative instruments held for trading purposes and their location on the consolidated statement of income: Location of Gain (Loss) Gain (Loss) Recognized in Income on Derivatives Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 (in millions) Interest rate contracts Trading revenue $ (120) $ 173 $ 8 $ 118 Foreign exchange contracts Trading revenue 85 35 226 169 Equity contracts Trading revenue (495) 522 (2,016) (651) Precious metals contracts Trading revenue (2) 84 (13) 233 Credit contracts Trading revenue (115) 170 11 191 Total $ (647) $ 984 $ (1,784) $ 60
Schedule of Gains and Losses on Derivative Instruments Held for Non-qualifying Hedging Activities	The following table presents information on gains and losses on derivative instruments held for non-qualifying hedging and other activities and their location on the consolidated statement of income: Location of Gain (Loss) Gain (Loss) Recognized in Income on Derivatives Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 (in millions) Interest rate contracts Gain (loss) on instruments designated at fair value and related derivatives $ 69 $ (100) $ (4) $ (110) Equity contracts Gain (loss) on instruments designated at fair value and related derivatives 186 (188) 321 518 Equity contracts Other income (loss) 4 — 4 — Credit contracts Other income (loss) (14) (17) (45) (42) Other contracts (1) Other income (loss) (31) (31) (33) (40) Total $ 214 $ (336) $ 243 $ 326 (1) Consists of swap agreements entered into in conjunction with the sales of Visa Class B Shares.
Credit-Risk Related Contingent Features	The following table presents the amount of additional collateral that we would be required to post (from the current collateral level) related to derivative instruments with credit-risk related contingent features if our long-term ratings were downgraded by one or two notches. A downgrade by a single rating agency that does not result in a rating lower than a preexisting corresponding rating provided by another rating agency will generally not result in additional collateral. One-notch downgrade Two-notch downgrade (in millions) Amount of additional collateral to be posted upon downgrade $ — $ 36
Notional Value of Derivative Contracts	The following table summarizes the notional values of derivative contracts: September 30, 2024 December 31, 2023 (in millions) Interest rate: Futures and forwards $ 28,547 $ 5,143 Swaps 99,232 114,947 Options written 1,054 1,260 Options purchased 1,461 1,352 Total interest rate 130,294 122,702 Foreign exchange: Swaps, futures and forwards 1,040,911 1,005,683 Options written 39,030 30,755 Options purchased 39,115 30,898 Spot 58,328 29,631 Total foreign exchange 1,177,384 1,096,967 Commodities, equities and precious metals: Swaps, futures and forwards 32,824 53,110 Options written 1,570 1,713 Options purchased 8,915 8,464 Total commodities, equities and precious metals 43,309 63,287 Credit derivatives 19,021 16,710 Other contracts (1) 1,452 1,416 Total $ 1,371,460 $ 1,301,082 (1) Consists of swap agreements entered into in conjunction with the sales of Visa Class B Shares.

Fair Value Option (Tables)

Fair Value Option (Tables)	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Summary of Fair Value and Unpaid Principal Balance for Items Accounted for Under FVO	The following table summarizes the fair value and unpaid principal balance for items we account for under FVO: Fair Value Unpaid Principal Balance Fair Value Over (Under) Unpaid Principal Balance (in millions) At September 30, 2024 Student loans held for investment $ 12 $ 14 $ (2) Commercial loans held for sale 673 680 (7) Fixed rate long-term debt 785 741 44 Hybrid instruments: Structured deposits 2,594 2,497 97 Structured notes 6,360 6,056 304 At December 31, 2023 Student loans held for investment $ 15 $ 17 $ (2) Commercial loans held for sale 250 256 (6) Client share repurchase asset 10 10 — Fixed rate long-term debt 749 741 8 Hybrid instruments: Structured deposits 1,821 1,816 5 Structured notes 6,790 6,418 372 Client share repurchase liability 10 10 —
Components of Gain on Instruments at Fair Value and Related Derivatives	The following table summarizes the components of gain (loss) on instruments designated at fair value and related derivatives reflected in the consolidated statement of income for the three and nine months ended September 30, 2024 and 2023: Loans and Loans Held for Sale Long-Term Hybrid Total (in millions) Three Months Ended September 30, 2024 Interest rate and other components (1) $ — $ (33) $ (226) $ (259) Credit risk component (2) 1 — — 1 Total mark-to-market on financial instruments designated at fair value 1 (33) (226) (258) Mark-to-market on related derivatives — 38 218 256 Net realized gain (loss) on related long-term debt derivatives — (1) — (1) Gain (loss) on instruments designated at fair value and related derivatives $ 1 $ 4 $ (8) $ (3) Three Months Ended September 30, 2023 Interest rate and other components (1) $ — $ 50 $ 228 $ 278 Credit risk component (2) 1 — — 1 Total mark-to-market on financial instruments designated at fair value 1 50 228 279 Mark-to-market on related derivatives — (54) (233) (287) Net realized gain (loss) on related long-term debt derivatives — (1) — (1) Gain (loss) on instruments designated at fair value and related derivatives $ 1 $ (5) $ (5) $ (9) Nine Months Ended September 30, 2024 Interest rate and other components (1) $ — $ (3) $ (347) $ (350) Credit risk component (2) — — — — Total mark-to-market on financial instruments designated at fair value — (3) (347) (350) Mark-to-market on related derivatives — 3 316 319 Net realized gain (loss) on related long-term debt derivatives — (2) — (2) Gain (loss) on instruments designated at fair value and related derivatives $ — $ (2) $ (31) $ (33) Nine Months Ended September 30, 2023 Interest rate and other components (1) $ — $ 52 $ (498) $ (446) Credit risk component (2) 9 — — 9 Total mark-to-market on financial instruments designated at fair value 9 52 (498) (437) Mark-to-market on related derivatives — (59) 467 408 Net realized gain on related long-term debt derivatives — — — — Gain (loss) on instruments designated at fair value and related derivatives $ 9 $ (7) $ (31) $ (29) (1) As it relates to hybrid instruments, interest rate and other components primarily includes interest rate and equity contract risks. (2) The fair value movement on fair value option liabilities attributable to our own credit spread is recorded in other comprehensive income (loss).

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	The following table presents changes in accumulated other comprehensive loss balances: Three Months Ended September 30, 2024 2023 (in millions) Unrealized gains (losses) on investment securities: Balance at beginning of period $ (1,924) $ (2,129) Other comprehensive income (loss) for period: Net unrealized gains (losses) arising during period, net of tax of $145 million and $(113) million, respectively 438 (346) Reclassification adjustment for losses realized in net income, net of tax of $36 million and nil, respectively (1) 112 — Total other comprehensive income (loss) for period 550 (346) Balance at end of period (1,374) (2,475) Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread: Balance at beginning of period 20 85 Other comprehensive income (loss) for period: Net unrealized gains (losses) arising during period, net of tax of $1 million and $(2) million, respectively 4 (8) Total other comprehensive income (loss) for period 4 (8) Balance at end of period 24 77 Unrealized gains (losses) on derivatives designated as cash flow hedges: Balance at beginning of period (196) (347) Other comprehensive income (loss) for period: Net unrealized gains (losses) arising during period, net of tax of $(40) million and $7 million, respectively (124) 20 Reclassification adjustment for losses realized in net income, net of tax of $5 million and $13 million, respectively (2) 17 40 Total other comprehensive income (loss) for period (107) 60 Balance at end of period (303) (287) Pension and postretirement benefit liability: Balance at beginning of period 7 5 Other comprehensive income (loss) for period: Change in unfunded pension and postretirement liability, net of tax of less than $(1) million and less than $(1) million, respectively (1) (1) Total other comprehensive loss for period (1) (1) Balance at end of period 6 4 Total accumulated other comprehensive loss at end of period $ (1,647) $ (2,681) Nine Months Ended September 30, 2024 2023 (in millions) Unrealized gains (losses) on investment securities: Balance at beginning of period $ (1,734) $ (2,270) Other comprehensive income (loss) for period: Net unrealized gains (losses) arising during period, net of tax of $85 million and $(66) million, respectively 255 (203) Reclassification adjustment for (gains) losses realized in net income, net of tax of $34 million and less than $(1) million, respectively (1) 104 (2) Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity realized in net income, net of tax of less than $1 million and nil, respectively (3) 1 — Total other comprehensive income (loss) for period 360 (205) Balance at end of period (1,374) (2,475) Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread: Balance at beginning of period 61 86 Other comprehensive income (loss) for period: Net unrealized losses arising during period, net of tax of $(12) million and $(3) million, respectively (37) (9) Total other comprehensive loss for period (37) (9) Balance at end of period 24 77 Unrealized gains (losses) on derivatives designated as cash flow hedges: Balance at beginning of period (260) (396) Other comprehensive income (loss) for period: Net unrealized losses arising during period, net of tax of $(25) million and $(1) million, respectively (77) (7) Reclassification adjustment for losses realized in net income, net of tax of $11 million and $37 million, respectively (2) 34 116 Total other comprehensive income (loss) for period (43) 109 Balance at end of period (303) (287) Pension and postretirement benefit liability: Balance at beginning period 7 5 Other comprehensive income (loss) for period: Change in unfunded pension and postretirement liability, net of tax of less than $(1) million and less than $(1) million, respectively (1) (1) Total other comprehensive loss for period (1) (1) Balance at end of period 6 4 Total accumulated other comprehensive loss at end of period $ (1,647) $ (2,681) (1) Amount reclassified to net income is included in other securities gains (losses), net in our consolidated statement of income. (2) Amount reclassified to net income is included in net interest income in our consolidated statement of income. (3) Amount amortized to net income is included in interest income in our consolidated statement of income. During 2014, we transferred securities from available-for-sale to held-to-maturity. At the date of transfer, AOCI included net pretax unrealized losses related to the transferred securities which are being amortized over the remaining contractual life of each security as an adjustment of yield in a manner consistent with the amortization of any premium or discount.

Fee Income from Contracts wit_2

Fee Income from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Disaggregation of Fee Income	The following table summarizes fee income from contracts with customers disaggregated by type of activity, as well as a reconciliation to total other revenues, during the three and nine months ended September 30, 2024 and 2023. See Note 23, "Fee Income from Contracts with Customers," in our 2023 Form 10-K for a description of the various types of fee-based activities and how revenue associated with these activities is recognized. There have been no significant changes in these activities since December 31, 2023. Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 (in millions) Credit card fees, net $ 14 $ 13 $ 42 $ 36 Trust and investment management fees 37 33 107 96 Other fees and commissions: Account services 80 70 231 209 Credit facilities 69 89 243 238 Other fees 8 11 29 28 Total other fees and commissions 157 170 503 475 Servicing and other fees from HSBC affiliates 99 87 280 238 Insurance (1) 1 1 3 3 Total fee income from contracts with customers 308 304 935 848 Other non-fee revenue 26 213 475 570 Total other revenues (2) $ 334 $ 517 $ 1,410 $ 1,418 (1) Included within other income (loss) in the consolidated statement of income. (2) See Note 13, "Business Segments," for a reconciliation of total other revenues on a U.S. GAAP basis to other operating income for each business segment under the Group Reporting Basis.

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2024
Related Party Transactions [Abstract]
Summary of Related Party Transactions	The following tables present related party balances and the income (expense) generated by related party transactions: September 30, 2024 December 31, 2023 (in millions) Assets: Cash and due from banks $ 205 $ 133 Interest bearing deposits with banks 37 90 Securities purchased under agreements to resell (1) 769 406 Trading assets 84 57 Loans 3,784 2,618 Other (2) 459 491 Total assets $ 5,338 $ 3,795 Liabilities: Deposits $ 10,167 $ 9,110 Trading liabilities 283 321 Short-term borrowings 1,342 1,014 Long-term debt 6,747 6,511 Other (2) 272 331 Total liabilities $ 18,811 $ 17,287 (1) Reflects purchases of securities under which other HSBC affiliates have agreed to repurchase. (2) Other assets and other liabilities primarily consist of derivative balances associated with hedging activities and other miscellaneous account receivables and payables. Other assets also includes receivables from HSBC Bank plc associated with certain client share repurchase transactions. Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 (in millions) Income (Expense): Interest income $ 66 $ 56 $ 181 $ 170 Interest expense (140) (132) (423) (375) Net interest expense (74) (76) (242) (205) Trading revenue (expense) (2,194) 1,043 (5,275) (372) Servicing and other fees from HSBC affiliates: HSBC Bank plc 50 47 147 125 HSBC Markets (USA) Inc. ("HMUS") 24 21 74 61 Other HSBC affiliates 25 19 59 52 Total servicing and other fees from HSBC affiliates 99 87 280 238 Gain (loss) on instruments designated at fair value and related derivatives 218 (233) 316 467 Support services from HSBC affiliates: HSBC Technology & Services (USA) Inc. ("HTSU") (238) (241) (707) (706) HMUS (66) (59) (183) (167) Other HSBC affiliates (124) (126) (356) (362) Total support services from HSBC affiliates (428) (426) (1,246) (1,235) Rental income from HSBC affiliates (1) 11 8 39 24 Stock based compensation expense (2) (7) (4) (22) (14) (1) We receive rental income from our affiliates for certain office space, which is recorded as a component of occupancy expense, net in our consolidated statement of income. (2) Employees may participate in one or more stock compensation plans sponsored by HSBC. These expenses are included in salaries and employee benefits in our consolidated statement of income. Certain employees are also eligible to participate in a defined benefit pension plan and other postretirement plans sponsored by HSBC North America which are discussed in Note 22, "Pension and Other Postretirement Benefits," in our 2023 Form 10-K.
Schedule of Loan Balances Outstanding with Affiliates	At September 30, 2024 and December 31, 2023, we had the following loan balances outstanding with HSBC affiliates: September 30, 2024 December 31, 2023 (in millions) HMUS and subsidiaries $ 2,183 $ 1,318 HSBC North America 1,600 1,300 Other short-term affiliate lending 1 — Total loans $ 3,784 $ 2,618

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2024
Segment Reporting [Abstract]
Summary on Reconciliation of Results under Group Reporting Basis to US GAAP	The following table summarizes the results for each segment on a Group Reporting Basis, as well as provides a reconciliation of total results under the Group Reporting Basis to U.S. GAAP consolidated totals: Group Reporting Basis Consolidated Amounts GBM WPB CMB GB MSS GBM Other CC Total Group Reporting Basis Adjust- ments (1) Group Reporting Basis Reclassi- fications (2) U.S. GAAP (in millions) Three Months Ended September 30, 2024 Net interest income (expense) $ 175 $ 305 $ 136 $ 13 $ (3) $ (175) $ 451 $ 9 $ (21) $ 439 Other operating income (expense) 8 29 78 72 (48) 174 313 (7) 28 334 Total operating income (expense) 183 334 214 85 (51) (1) 764 2 7 773 Expected credit losses / provision for credit losses 2 21 (4) — — — 19 (32) — (13) 181 313 218 85 (51) (1) 745 34 7 786 Operating expenses 207 187 133 78 25 24 654 10 7 671 Profit (loss) before income tax $ (26) $ 126 $ 85 $ 7 $ (76) $ (25) $ 91 $ 24 $ — $ 115 Group Reporting Basis Consolidated Amounts GBM WPB CMB GB MSS GBM Other CC Total Group Reporting Basis Adjust- ments (1) Group Reporting Basis Reclassi- fications (2) U.S. GAAP (in millions) Three Months Ended September 30, 2023 Net interest income (expense) $ 175 $ 285 $ 111 $ 4 $ (9) $ (134) $ 432 $ 1 $ (61) $ 372 Other operating income 28 74 92 115 17 120 446 (8) 79 517 Total operating income (expense) 203 359 203 119 8 (14) 878 (7) 18 889 Expected credit losses / provision for credit losses (5) 8 (18) — — — (15) 7 — (8) 208 351 221 119 8 (14) 893 (14) 18 897 Operating expenses 194 175 144 68 19 36 636 4 18 658 Profit (loss) before income tax $ 14 $ 176 $ 77 $ 51 $ (11) $ (50) $ 257 $ (18) $ — $ 239 Nine Months Ended September 30, 2024 Net interest income (expense) $ 529 $ 884 $ 369 $ 30 $ 18 $ (502) $ 1,328 $ 22 $ (73) $ 1,277 Other operating income (expense) 133 189 266 231 (2) 507 1,324 (13) 99 1,410 Total operating income 662 1,073 635 261 16 5 2,652 9 26 2,687 Expected credit losses / provision for credit losses — 56 (4) — — — 52 (16) — 36 662 1,017 639 261 16 5 2,600 25 26 2,651 Operating expenses 592 555 398 238 72 142 1,997 17 26 2,040 Profit (loss) before income tax $ 70 $ 462 $ 241 $ 23 $ (56) $ (137) $ 603 $ 8 $ — $ 611 Balances at end of period: Total assets $ 38,385 $ 54,909 $ 10,122 $ 35,264 $ 38,053 $ 4,278 $ 181,011 $ (13,212) $ — $ 167,799 Total loans, net 25,785 24,045 9,828 117 76 — 59,851 (1,054) 2,670 61,467 Goodwill — 358 — — — — 358 100 — 458 Total deposits 28,903 43,333 40,881 1,393 1,264 — 115,774 (1,192) 8,791 123,373 Nine Months Ended September 30, 2023 Net interest income (expense) $ 582 $ 858 $ 373 $ 32 $ (21) $ (347) $ 1,477 $ 4 $ (192) $ 1,289 Other operating income 132 225 238 261 63 317 1,236 (57) 239 1,418 Total operating income (expense) 714 1,083 611 293 42 (30) 2,713 (53) 47 2,707 Expected credit losses / provision for credit losses (3) 38 12 — — — 47 1 — 48 717 1,045 599 293 42 (30) 2,666 (54) 47 2,659 Operating expenses 420 484 420 208 51 104 1,687 200 47 1,934 Profit (loss) before income tax $ 297 $ 561 $ 179 $ 85 $ (9) $ (134) $ 979 $ (254) $ — $ 725 Balances at end of period: Total assets $ 42,719 $ 52,215 $ 9,554 $ 42,663 $ 36,303 $ 2,988 $ 186,442 $ (22,085) $ — $ 164,357 Total loans, net 23,178 23,119 9,009 104 394 — 55,804 (313) 1,525 57,016 Goodwill — 358 — — — — 358 100 — 458 Total deposits 29,253 44,948 38,810 825 1,668 — 115,504 (3,853) 8,277 119,928 (1) Represents adjustments associated with differences between U.S. GAAP and the Group Reporting Basis. (2) Represents differences in financial statement presentation between U.S. GAAP and the Group Reporting Basis.

Retained Earnings and Regulat_2

Retained Earnings and Regulatory Capital Requirements (Tables)	9 Months Ended
	Sep. 30, 2024
Retained Earnings Note Disclosure [Abstract]
Capital Amounts and Ratios in Accordance With Current Banking Regulations	The following table summarizes the capital amounts and ratios of HSBC USA and HSBC Bank USA, calculated in accordance with the Basel III rule at September 30, 2024 and December 31, 2023: September 30, 2024 December 31, 2023 Capital Well-Capitalized Ratio (1) Actual Capital Well-Capitalized Ratio (1) Actual (dollars are in millions) Common equity Tier 1 ratio: HSBC USA $ 13,279 4.5 % (2) 13.0 % $ 12,822 4.5 % (2) 13.0 % HSBC Bank USA 15,527 6.5 15.9 15,407 6.5 16.1 Tier 1 capital ratio: HSBC USA 13,544 6.0 13.3 13,087 6.0 13.3 HSBC Bank USA 17,027 8.0 17.5 16,907 8.0 17.7 Total capital ratio: HSBC USA 15,889 10.0 15.5 15,452 10.0 15.7 HSBC Bank USA 19,077 10.0 19.6 19,024 10.0 19.9 Tier 1 leverage ratio: HSBC USA 13,544 4.0 (2) 8.2 13,087 4.0 (2) 7.7 HSBC Bank USA 17,027 5.0 10.5 16,907 5.0 10.2 Risk-weighted assets: (3) HSBC USA 102,195 98,450 HSBC Bank USA 97,500 95,455 Adjusted quarterly average assets: (4) HSBC USA 166,088 170,527 HSBC Bank USA 161,401 166,526 (1) HSBC USA and HSBC Bank USA are categorized as "well-capitalized," as defined by their principal regulators. To be categorized as well-capitalized under regulatory guidelines, a banking institution must maintain capital equal to or in excess of the ratios reflected in the above table, and must not be subject to a directive, order, or written agreement to meet and maintain specific capital levels. (2) There are no common equity Tier 1 or Tier 1 leverage ratio components in the definition of a well-capitalized bank holding company. The ratios shown are the regulatory minimums. (3) Calculated using the Standardized Approach. (4) Represents the Tier 1 leverage ratio denominator which reflects quarterly average assets adjusted for amounts permitted to be deducted from Tier 1 capital.

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Assets and Liabilities Related to Consolidated Variable Interest Entities	The following table summarizes assets and liabilities related to our consolidated VIEs at September 30, 2024 and December 31, 2023 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation. September 30, 2024 December 31, 2023 Consolidated Consolidated Consolidated Consolidated (in millions) Low income housing limited liability partnership: Other assets $ 13 $ — $ 23 $ — Interest, taxes and other liabilities — 21 — 17 Total $ 13 $ 21 $ 23 $ 17
Variable Interests Held by Us and Our Maximum Exposure to Loss Rising From Our Involvements in Those VIEs	The following table provides additional information on these unconsolidated VIEs, including the variable interests held by us and our maximum exposure to loss arising from our involvement in these VIEs, at September 30, 2024 and December 31, 2023: Total Assets Held by Unconsolidated VIEs Carrying Value of Variable Interests Held Reported as Maximum Assets Liabilities (in millions) At September 30, 2024 Limited partnership investments $ 6,519 $ 895 $ 387 $ 895 Asset-backed financing SPEs 1,107 767 — 774 Total $ 7,626 $ 1,662 $ 387 $ 1,669 At December 31, 2023 Limited partnership investments $ 6,718 $ 793 $ 327 $ 793 Asset-backed financing SPEs 1,107 938 — 938 Total $ 7,825 $ 1,731 $ 327 $ 1,731

Guarantee Arrangements, Pledg_2

Guarantee Arrangements, Pledged Assets and Repurchase Agreements (Tables)	9 Months Ended
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Carrying Value and Contractual Amounts of our Sell Protection Credit Derivatives and Major Off-Balance Sheet Guarantee Arrangements	The following table presents total carrying value and contractual amounts of our sell protection credit derivatives and major off-balance sheet guarantee arrangements at September 30, 2024 and December 31, 2023. Following the table is a description of the various arrangements. September 30, 2024 December 31, 2023 Carrying Notional / Maximum Carrying Notional / Maximum (in millions) Credit derivatives (1)(2) $ 143 $ 5,642 $ 54 $ 2,992 Financial standby letters of credit, net of participations (3)(4) — 5,469 — 5,785 Performance standby letters of credit, net of participations (3)(4) — 3,180 — 3,320 Total $ 143 $ 14,291 $ 54 $ 12,097 (1) Includes $2,557 million and $1,483 million of notional issued for the benefit of HSBC affiliates at September 30, 2024 and December 31, 2023, respectively. (2) For credit derivatives, the maximum loss is represented by the notional amounts without consideration of mitigating effects from collateral or recourse arrangements. (3) Includes $1,740 million and $2,080 million of both financial and performance standby letters of credit issued for the benefit of HSBC affiliates at September 30, 2024 and December 31, 2023, respectively. (4) For standby letters of credit, maximum loss represents losses to be recognized assuming the letters of credit have been fully drawn and the obligors have defaulted with zero recovery.
Net Credit Derivative Positions	The following table summarizes our net credit derivative positions at September 30, 2024 and December 31, 2023: September 30, 2024 December 31, 2023 Carrying / Fair Notional Carrying / Fair Notional (in millions) Sell-protection credit derivative positions $ 143 $ 5,642 $ 54 $ 2,992 Buy-protection credit derivative positions (278) 13,379 (196) 13,718 Net position (1) $ (135) $ 7,737 $ (142) $ 10,726 (1) Positions are presented net in the table above to provide a complete analysis of our risk exposure and depict the way we manage our credit derivative portfolio. The offset of the sell-protection credit derivatives against the buy-protection credit derivatives may not be legally binding in the absence of master netting agreements with the same counterparty. Furthermore, the credit loss triggering events for individual sell-protection credit derivatives may not be the same or occur in the same period as those of the buy-protection credit derivatives thereby not providing an exact offset.
Summary of Credit Ratings of Credit Risk Related Guarantees	The following table summarizes the credit ratings related to guarantees including the ratings of counterparties against which we sold credit protection and financial standby letters of credit at September 30, 2024 as an indicative proxy of payment risk: Average Credit Ratings of the Obligors Notional/Contractual Amounts Investment Non-Investment Total (dollars are in millions) Sell-protection credit derivatives: (1) Single name credit default swaps 1.2 $ 1,021 $ 373 $ 1,394 Index credit derivatives 4.4 3,260 988 4,248 Subtotal 4,281 1,361 5,642 Standby letters of credit (2) 0.8 6,434 2,215 8,649 Total $ 10,715 $ 3,576 $ 14,291 (1) The credit ratings in the table represent external credit ratings for classification as investment grade and non-investment grade. (2) External ratings for most of the obligors are not available. Presented above are the internal credit ratings which are developed using similar methodologies and rating scale equivalent to external credit ratings for purposes of classification as investment grade and non-investment grade.
Summary of Pledged Assets Included in Consolidated Balance Sheet	Pledged assets included in the consolidated balance sheet consisted of the following: September 30, 2024 December 31, 2023 (in millions) Interest bearing deposits with banks (1) $ 1,072 $ 998 Trading assets (2) 3,417 3,046 Securities available-for-sale (3) 14,554 9,773 Securities held-to-maturity (3) 9,991 5,387 Loans (4) 23,805 18,810 Other assets (5) 849 934 Total $ 53,688 $ 38,948 (1) Represents gross amount of cash on deposit with banks primarily related to derivative collateral-support agreements, of which a majority has been netted against derivative liabilities on the consolidated balance sheet. (2) Trading assets are primarily pledged against liabilities associated with repurchase agreements. (3) Securities are primarily pledged against derivatives, public fund deposits, trust deposits and various short-term and long term borrowings, as well as providing capacity for potential secured borrowings from the FHLB and the Federal Reserve Bank of New York. (4) Loans are primarily residential mortgage loans pledged against current and potential borrowings from the FHLB and the Federal Reserve Bank of New York. (5) Represents gross amount of cash on deposit with non-banks primarily related to derivative collateral support agreements, of which a majority has been netted against derivative liabilities on the consolidated balance sheet.
Offsetting Assets and Liabilities	The following table provides information about resale and repurchase agreements that are subject to offset at September 30, 2024 and December 31, 2023: Gross Amounts Not Offset in the Balance Sheet Gross Amounts Recognized Gross Amounts Offset in the Balance Sheet (1) Net Amounts Presented in the Balance Sheet Financial Instruments (2) Cash Collateral Received / Pledged Net Amount (3) (in millions) At September 30, 2024 Assets: Securities purchased under resale agreements $ 8,788 $ 4,478 $ 4,310 $ 4,305 $ — $ 5 Liabilities: Securities sold under repurchase agreements $ 5,697 $ 4,478 $ 1,219 $ 1,212 $ — $ 7 At December 31, 2023 Assets: Securities purchased under resale agreements $ 19,382 $ 5,504 $ 13,878 $ 13,677 $ 7 $ 194 Liabilities: Securities sold under repurchase agreements $ 5,771 $ 5,504 $ 267 $ 266 $ — $ 1 (1) Represents recognized amount of resale and repurchase agreements with counterparties subject to legally enforceable netting agreements that meet the applicable netting criteria as permitted by generally accepted accounting principles. (2) Represents securities received or pledged to cover financing transaction exposures. (3) Represents the amount of our exposure that is not collateralized / covered by pledged collateral.
Class of Collateral Pledged and Remaining Contractual Maturity of Repurchase Agreements Accounted for as Secured Borrowings	The following table provides the class of collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings at September 30, 2024 and December 31, 2023: Overnight and Continuous Up to 30 Days 31 to 90 Days 91 Days to One Year Greater Than One Year Total (in millions) At September 30, 2024 U.S. Treasury, U.S. Government sponsored and U.S. Government agency securities $ 3,531 $ 594 $ 944 $ 628 $ — $ 5,697 At December 31, 2023 U.S. Treasury, U.S. Government sponsored and U.S. Government agency securities $ 3,107 $ 288 $ 918 $ 1,458 $ — $ 5,771

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Assets and Liabilities Recorded at Fair Value on a Recurring Basis	The following table presents information about our assets and liabilities measured at fair value on a recurring basis at September 30, 2024 and December 31, 2023, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value. Unless otherwise noted below, assets and liabilities in the following table are recorded at fair value through net income. Fair Value Measurements on a Recurring Basis September 30, 2024 Level 1 Level 2 Level 3 Gross Netting (1) Net (in millions) Assets: Trading assets, excluding derivatives: U.S. Treasury, U.S. Government agencies and sponsored enterprises $ 4,038 $ 1,229 $ — $ 5,267 $ — $ 5,267 Debt securities issued by foreign entities 759 — — 759 — 759 Equity securities 14,344 — — 14,344 — 14,344 Precious metals trading — 160 — 160 — 160 Derivatives: (2) Interest rate contracts 7 897 3 907 — 907 Foreign exchange contracts — 9,568 5 9,573 — 9,573 Equity contracts 5 714 212 931 — 931 Precious metals contracts — 1,288 — 1,288 — 1,288 Credit contracts — 122 — 122 — 122 Other contracts (3) — — 11 11 — 11 Derivatives netting — — — — (11,598) (11,598) Total derivatives 12 12,589 231 12,832 (11,598) 1,234 Securities available-for-sale: (4) U.S. Treasury, U.S. Government agencies and sponsored enterprises 10,012 11,858 — 21,870 — 21,870 Asset-backed securities: Home equity — — 10 10 — 10 Other — — 92 92 — 92 Debt securities issued by foreign entities 3,970 — — 3,970 — 3,970 Loans (5) — 12 — 12 — 12 Loans held for sale (5) — 595 78 673 — 673 Other assets: Mortgage servicing rights — — 7 7 — 7 Equity securities — 130 — 130 — 130 Equity securities measured at net asset value (6) — — — 130 — 130 Total assets $ 33,135 $ 26,573 $ 418 $ 60,256 $ (11,598) $ 48,658 Liabilities: Domestic deposits (5) $ — $ 2,182 $ 412 $ 2,594 $ — $ 2,594 Trading liabilities, excluding derivatives 1,528 238 — 1,766 — 1,766 Derivatives: (2) Interest rate contracts 1 752 5 758 — 758 Foreign exchange contracts — 9,680 5 9,685 — 9,685 Equity contracts — 1,129 135 1,264 — 1,264 Precious metals contracts — 1,271 — 1,271 — 1,271 Credit contracts — 264 1 265 — 265 Other contracts (3) — — 56 56 — 56 Derivatives netting — — — — (11,939) (11,939) Total derivatives 1 13,096 202 13,299 (11,939) 1,360 Long-term debt (5) — 4,715 2,430 7,145 — 7,145 Total liabilities $ 1,529 $ 20,231 $ 3,044 $ 24,804 $ (11,939) $ 12,865 Fair Value Measurements on a Recurring Basis December 31, 2023 Level 1 Level 2 Level 3 Gross Netting (1) Net (in millions) Assets: Trading assets, excluding derivatives: U.S. Treasury, U.S. Government agencies and sponsored enterprises $ 3,564 $ 1,208 $ — $ 4,772 $ — $ 4,772 Debt securities issued by foreign entities 4,019 — — 4,019 — 4,019 Equity securities 11,702 — — 11,702 — 11,702 Precious metals trading — 346 — 346 — 346 Derivatives: (2) Interest rate contracts 7 1,246 2 1,255 — 1,255 Foreign exchange contracts — 13,605 1 13,606 — 13,606 Equity contracts 7 844 190 1,041 — 1,041 Precious metals contracts 3 1,150 — 1,153 — 1,153 Credit contracts — 107 2 109 — 109 Other contracts (3) — — 5 5 — 5 Derivatives netting — — — — (15,870) (15,870) Total derivatives 17 16,952 200 17,169 (15,870) 1,299 Securities available-for-sale: (4) U.S. Treasury, U.S. Government agencies and sponsored enterprises 7,799 15,324 — 23,123 — 23,123 Asset-backed securities: Home equity — — 12 12 — 12 Other — — 92 92 — 92 Debt securities issued by foreign entities 2,359 110 — 2,469 — 2,469 Loans (5) — 15 — 15 — 15 Loans held for sale (5) — 218 32 250 — 250 Other assets: Mortgage servicing rights — — 19 19 — 19 Equity securities — 127 — 127 — 127 Equity securities measured at net asset value (6) — — — 143 — 143 Other (5)(7) — 10 — 10 — 10 Total assets $ 29,460 $ 34,310 $ 355 $ 64,268 $ (15,870) $ 48,398 Liabilities: Domestic deposits (5) $ — $ 1,528 $ 293 $ 1,821 $ — $ 1,821 Trading liabilities, excluding derivatives 1,688 301 — 1,989 — 1,989 Derivatives: (2) Interest rate contracts 16 1,100 6 1,122 — 1,122 Foreign exchange contracts — 13,534 1 13,535 — 13,535 Equity contracts — 1,104 169 1,273 — 1,273 Precious metals contracts — 1,033 — 1,033 — 1,033 Credit contracts — 259 1 260 — 260 Other contracts (3) — — 40 40 — 40 Derivatives netting — — — — (15,431) (15,431) Total derivatives 16 17,030 217 17,263 (15,431) 1,832 Long-term debt (5) — 5,620 1,919 7,539 — 7,539 Other liabilities (5)(7) — 10 — 10 — 10 Total liabilities $ 1,704 $ 24,489 $ 2,429 $ 28,622 $ (15,431) $ 13,191 (1) Represents counterparty and cash collateral netting which allow the offsetting of amounts relating to certain contracts if certain conditions are met. (2) Includes trading derivative assets of $1,177 million and $1,276 million and trading derivative liabilities of $1,071 million and $1,496 million at September 30, 2024 and December 31, 2023, respectively, as well as derivatives held for hedging and other non-qualifying economic hedging activities. See Note 8, "Derivative Financial Instruments," for additional information. Excluding changes in fair value of a derivative instrument associated with a qualifying cash flow hedge, which are recognized initially in other comprehensive income (loss), derivative assets and liabilities are recorded at fair value through net income. (3) Consists of swap agreements entered into in conjunction with the sales of Visa Class B Shares. (4) Securities available-for-sale are recorded at fair value through other comprehensive income (loss). Changes in the allowance for credit losses on securities available-for-sale are recorded through net income. (5) See Note 9, "Fair Value Option," for additional information. Excluding the fair value movement on fair value option liabilities attributable to our own credit spread, which is recorded in other comprehensive income (loss), fair value option assets and liabilities are recorded at fair value through net income. (6) Investments that are measured at fair value using the net asset value per share practical expedient have not been classified in the fair value hierarchy. (7) Consists of assets and liabilities associated with certain client share repurchase transactions.
Changes in Fair Value of Level 3 Assets and Liabilities	The following table summarizes additional information about changes in the fair value of Level 3 assets and liabilities during the three and nine months ended September 30, 2024 and 2023. As a risk management practice, we may risk manage the Level 3 assets and liabilities, in whole or in part, using securities and derivative positions that are classified as Level 1 or Level 2 measurements within the fair value hierarchy. Since those Level 1 and Level 2 risk management positions are not included in the table below, the information provided does not reflect the effect of such risk management activities related to the Level 3 assets and liabilities. Jul. 1, Total Realized / Unrealized Gains Purch- Issu- Settle- Transfers Transfers Sep. 30, Current Period Unrealized Gains Earnings Other Compre- Earnings Other Compre- (in millions) Assets: Derivatives, net: (1) Interest rate contracts $ (3) $ 2 $ — $ — $ — $ — $ (1) $ — $ (2) $ 2 $ — Foreign exchange contracts — — — — — — — — — — — Equity contracts 49 61 — — — (25) 4 (12) 77 53 — Credit contracts (4) — — — — — — 3 (1) — — Other contracts (2) (21) (31) — — — 7 — — (45) — — Asset-backed securities available-for-sale (3) 101 — 2 — — (1) — — 102 — 2 Loans held for sale (4) 44 — — 16 — (10) 43 (15) 78 — — Mortgage servicing rights (5) 19 (1) — — — (11) — — 7 (1) — Total assets $ 185 $ 31 $ 2 $ 16 $ — $ (40) $ 46 $ (24) $ 216 $ 54 $ 2 Liabilities: Domestic deposits (4) $ (386) $ (16) $ — $ — $ (86) $ 23 $ — $ 53 $ (412) $ (7) $ — Long-term debt (4) (2,110) (96) — — (733) 346 (3) 166 (2,430) (64) — Total liabilities $ (2,496) $ (112) $ — $ — $ (819) $ 369 $ (3) $ 219 $ (2,842) $ (71) $ — Jan. 1, Total Realized / Unrealized Gains Purch- Issu- Settle- Transfers Transfers Sep. 30, Current Period Unrealized Gains Earnings Other Compre- Earnings Other Compre- (in millions) Assets: Derivatives, net: (1) Interest rate contracts $ (4) $ 1 $ — $ — $ — $ — $ 1 $ — $ (2) $ 1 $ — Foreign exchange contracts — — — — — — — — — — — Equity contracts 21 113 — — — (25) (3) (29) 77 75 — Credit contracts 1 (4) — — — (1) (3) 6 (1) (1) — Other contracts (2) (35) (33) — — — 23 — — (45) — — Asset-backed securities available-for-sale (3) 104 — — — — (2) — — 102 — — Loans held for sale (4) 32 1 — 52 — (43) 55 (19) 78 — — Mortgage servicing rights (5) 19 (1) — — — (11) — — 7 (1) — Total assets $ 138 $ 77 $ — $ 52 $ — $ (59) $ 50 $ (42) $ 216 $ 74 $ — Liabilities: Domestic deposits (4) $ (293) $ (23) $ (3) $ — $ (230) $ 71 $ (1) $ 67 $ (412) $ (6) $ (3) Long-term debt (4) (1,919) (235) (1) — (1,539) 916 (50) 398 (2,430) (119) (1) Total liabilities $ (2,212) $ (258) $ (4) $ — $ (1,769) $ 987 $ (51) $ 465 $ (2,842) $ (125) $ (4) Jul. 1, Total Realized / Unrealized Gains Purch- Issu- Settle- Transfers Transfers Sep. 30, Current Period Earnings Other Compre- Earnings Other Compre- (in millions) Assets: Derivatives, net: (1) Interest rate contracts $ (5) $ — $ — $ — $ — $ — $ — $ — $ (5) $ — $ — Foreign exchange contracts — — — — — — — — — — — Equity contracts (25) (83) — — — 3 4 3 (98) (63) — Credit contracts 2 — — — — — — — 2 — — Other contracts (2) (24) (31) — — — 15 — — (40) — — Asset-backed securities available-for-sale (3) 105 — (2) — — (2) — — 101 — (2) Loans held for sale (4) 3 2 — — — — 36 (5) 36 — — Mortgage servicing rights (5) 21 (1) — — — — — — 20 (1) — Total assets $ 77 $ (113) $ (2) $ — $ — $ 16 $ 40 $ (2) $ 16 $ (64) $ (2) Liabilities: Domestic deposits (4) $ (241) $ 6 $ 1 $ — $ (43) $ 26 $ — $ 1 $ (250) $ 7 $ 1 Long-term debt (4) (2,291) 37 — — (198) 326 (48) 197 (1,977) 60 — Total liabilities $ (2,532) $ 43 $ 1 $ — $ (241) $ 352 $ (48) $ 198 $ (2,227) $ 67 $ 1 Jan. 1, Total Realized / Unrealized Gains Purch- Issu- Settle- Transfers Transfers Sep. 30, Current Period Earnings Other Compre- Earnings Other Compre- (in millions) Assets: Derivatives, net: (1) Interest rate contracts $ (5) $ — $ — $ — $ — $ — $ — $ — $ (5) $ — $ — Foreign exchange contracts — — — — — — — — — — — Equity contracts (226) 106 — — — 21 3 (2) (98) 35 — Credit contracts 2 — — — — — — — 2 — — Other contracts (2) (33) (40) — — — 33 — — (40) — — Asset-backed securities available-for-sale (3) 108 — (3) — — (4) — — 101 — (3) Loans held for sale (4) 49 2 — 3 — (37) 36 (17) 36 — — Mortgage servicing rights (5) 22 (1) — — — (1) — — 20 (1) — Total assets $ (83) $ 67 $ (3) $ 3 $ — $ 12 $ 39 $ (19) $ 16 $ 34 $ (3) Liabilities: Domestic deposits (4) $ (373) $ 5 $ 2 $ — $ (44) $ 128 $ — $ 32 $ (250) $ 10 $ 2 Long-term debt (4) (2,639) (253) 3 — (572) 768 (84) 800 (1,977) (81) 3 Total liabilities $ (3,012) $ (248) $ 5 $ — $ (616) $ 896 $ (84) $ 832 $ (2,227) $ (71) $ 5 (1) Level 3 net derivatives included derivative assets of $231 million and derivative liabilities of $202 million at September 30, 2024 and derivative assets of $96 million and derivative liabilities of $237 million at September 30, 2023. Gains (losses) on derivatives, net are predominantly included in trading revenue and gain (loss) on instruments designated at fair value and related derivatives in the consolidated statement of income. (2) Consists of swap agreements entered into in conjunction with the sales of Visa Class B Shares. Gains (losses) on these swap agreements are included in other income (loss) in the consolidated statement of income. (3) Realized gains (losses) on securities available-for-sale are included in other securities gains (losses), net in the consolidated statement of income. Changes in the allowance for credit losses on securities available-for-sale are included in the provision for credit losses in the consolidated statement of income. Unrealized gains (losses) on securities available-for-sale are included in other comprehensive income (loss) (4) Excluding unrealized gains (losses) on fair value option liabilities attributable to our own credit spread, which are recorded in other comprehensive income (loss), gains (losses) on fair value option assets and liabilities are included in gain (loss) on instruments designated at fair value and related derivatives in the consolidated statement of income. (5) other income (loss)
Quantitative Information about Recurring Fair Value Measurement of Assets and Liabilities Classified as Level 3	The following table presents quantitative information about the unobservable inputs used to determine the recurring fair value measurement of assets and liabilities classified as Level 3 fair value measurements at September 30, 2024 and December 31, 2023: September 30, 2024 Financial Instrument Type Fair Value (in millions) Valuation Technique(s) Significant Unobservable Inputs Range of Inputs Weighted Average (1) Interest rate derivative contracts $ (2) Market comparable adjusted for probability to fund and, where applicable, option pricing model Probability to fund for rate lock commitments 58% - 100% 94% Interest rate yield curve 9% N/A Foreign exchange derivative contracts $ — Option pricing model Cross-currency basis (62)bps N/A Equity derivative contracts (2) $ 77 Option pricing model Equity / Equity Index volatility 6% - 112% 49% Equity / Equity and Equity / Index correlation 35% - 98% 83% Equity forward price $0 - $7,307 $1,115 Credit derivative contracts $ (1) Option pricing model and, where applicable, discounted cash flows Credit default swap spreads 17bps - 782bps 85bps Other derivative contracts $ (45) Discounted cash flows Conversion rate 1.5 times N/A Expected duration 1.5 years N/A Asset-backed securities available-for-sale $ 102 Discounted cash flows Market assumptions related to yields for comparable instruments 2% - 3% 2% Loans held for sale $ 78 Market comparables and internal assumptions Adjusted market price 95% - 101% 97% Mortgage servicing rights $ 7 Discounted cash flows Constant prepayment rates 7% - 20% 7% Discount rate 10% - 14% 10% Estimated annualized costs to service $70 - $79 per account $76 per account Domestic deposits (structured deposits) (2)(3) $ (412) Option adjusted discounted cash flows Equity / Equity Index volatility 6% - 55% 14% Equity / Equity and Equity / Index correlation 42% - 90% 69% Long-term debt (structured notes) (2)(3) $ (2,430) Option adjusted discounted cash flows Equity / Equity Index volatility 6% - 95% 26% Equity / Equity and Equity / Index correlation 35% - 98% 85% Credit default swap spreads 742bps NA December 31, 2023 Financial Instrument Type Fair Value (in millions) Valuation Technique(s) Significant Unobservable Inputs Range of Inputs Weighted Average (1) Interest rate derivative contracts $ (4) Market comparable adjusted for probability to fund and, where applicable, option pricing model Probability to fund for rate lock commitments 71% - 92% 84% Interest rate yield curve 9% N/A Foreign exchange derivative contracts $ — Option pricing model Cross-currency basis 8bps N/A Equity derivative contracts (2) $ 21 Option pricing model Equity / Equity Index volatility 6% - 111% 41% Equity / Equity and Equity / Index correlation 45% - 97% 84% Equity forward price $41 - $6,245 $643 Credit derivative contracts $ 1 Option pricing model and, where applicable, discounted cash flows Credit default swap spreads 59bps - 1,558bps 160bps Other derivative contracts $ (35) Discounted cash flows Conversion rate 1.6 times N/A Expected duration 1.0 year N/A Asset-backed securities available-for-sale $ 104 Discounted cash flows Market assumptions related to yields for comparable instruments 2% - 3% 2% Loans held for sale $ 32 Market comparables and internal assumptions Adjusted market price 78% - 100% 90% Mortgage servicing rights $ 19 Discounted cash flows Constant prepayment rates 6% - 17% 6% Discount rate 10% - 14% 10% Estimated annualized costs to service $72 - $77 per account $74 per account Domestic deposits (structured deposits) (2)(3) $ (293) Option adjusted discounted cash flows Equity / Equity Index volatility 7% - 29% 13% Equity / Equity and Equity / Index correlation 51% - 93% 71% Long-term debt (structured notes) (2)(3) $ (1,919) Option adjusted discounted cash flows Equity / Equity Index volatility 7% - 95% 22% Equity / Equity and Equity / Index correlation 45% - 97% 84% Credit default swap spreads 948bps NA (1) For equity derivatives, credit derivatives, structured deposits and structured notes, weighted averages are calculated based on the fair value of the instruments. For all remaining instrument types, weighted averages are calculated based on the notional value of the instruments. (2) We are the client-facing entity and, except for structured notes and deposits with embedded credit derivative features, we enter into identical but opposite derivatives to transfer the resultant risks to our affiliates. With the exception of counterparty credit risks, we are market risk neutral in substantially all of the structured notes and deposits. The corresponding intra-group derivatives are presented as equity derivatives in the table. (3) Structured deposits and structured notes contain embedded derivative features whose fair value measurements contain significant Level 3 inputs. See equity derivatives and credit derivatives below for a discussion of the uncertainty of Level 3 inputs related to structured deposits and structured notes. N/A Not Applicable
Assets and Liabilities Recorded at Fair Value on a Non Recurring Basis	The following table presents the fair value hierarchy level within which the fair value of the financial and non-financial assets has been recorded at September 30, 2024 and December 31, 2023. The gains (losses) during the three and nine months ended September 30, 2024 and 2023 are also included. Non-Recurring Fair Value Measurements at September 30, 2024 Total Gains (Losses) For the Three Months Ended September 30, 2024 Total Gains (Losses) For the Nine Months Ended September 30, 2024 Level 1 Level 2 Level 3 Total (in millions) Consumer loans (1) $ — $ 102 $ — $ 102 $ 1 $ 3 Commercial loans held for sale — — — — 1 3 Commercial loans (2) — — 428 428 9 (39) Leases (3) — — — — — (15) Total assets at fair value on a non-recurring basis $ — $ 102 $ 428 $ 530 $ 11 $ (48) Non-Recurring Fair Value Measurements at December 31, 2023 Total Gains (Losses) For the Three Months Ended September 30, 2023 Total Gains (Losses) For the Nine Months Ended September 30, 2023 Level 1 Level 2 Level 3 Total (in millions) Consumer loans (1) $ — $ 106 $ — $ 106 $ 1 $ — Commercial loans held for sale — — — — 6 (31) Commercial loans (2) — — 374 374 (6) (15) Leases (3) — — — — — (14) Total assets at fair value on a non-recurring basis $ — $ 106 $ 374 $ 480 $ 1 $ (60) (1) Represents residential mortgage loans held for investment whose carrying amount was adjusted during the period based on the fair value of the underlying collateral. (2) Certain commercial loans are individually assessed for impairment. We measure the credit impairment of a collateral-dependent loan based on the fair value of the collateral asset. The collateral often involves real estate properties that are illiquid due to market conditions. As a result, these loans are classified as a Level 3 fair value measurement within the fair value hierarchy. (3) During the nine months ended September 30, 2024, we wrote down lease ROU assets associated with the exit of our previous U.S. headquarters. During the nine months ended September 30, 2023, we wrote down lease ROU assets and leasehold improvement assets associated with the exit of certain office space.
Quantitative Information about Non Recurring Fair Value Measurement of Assets and Liabilities	The following tables present quantitative information about non-recurring fair value measurements of assets and liabilities classified with Level 3 of the fair value hierarchy at September 30, 2024 and December 31, 2023: At September 30, 2024 Financial Instrument Type Fair Value (in millions) Valuation Technique(s) Significant Unobservable Inputs Range of Inputs Weighted Average (1) Commercial loans $ 428 Valuation of third-party appraisal Loss severity rates 0% - 100% 22% At December 31, 2023 Financial Instrument Type Fair Value (in millions) Valuation Technique(s) Significant Unobservable Inputs Range of Inputs Weighted Average (1) Commercial loans $ 374 Valuation of third-party appraisal Loss severity rates 1% - 93% 25% (1) Weighted average is calculated based on the carrying value of the loans.
Additional Information Relating to Asset-Backed Securities and Collateralized Debt Obligations	The following tables provide additional information relating to our available-for-sale asset-backed securities at September 30, 2024: Rating of Securities: (1) Collateral Type: Level 3 (in millions) AAA - A Home equity - Alt A $ 10 BBB - B Other 92 $ 102 (1) We utilize S&P as the primary source of credit ratings in the tables above. If S&P ratings are not available, ratings by Moody's and Fitch are used in that order.
Carrying Value and Estimated Fair Value of Financial Instruments	The following table summarizes the carrying value and estimated fair value of our financial instruments, excluding financial instruments that are carried at fair value on a recurring basis, at September 30, 2024 and December 31, 2023, and their classification within the fair value hierarchy: September 30, 2024 Carrying Fair Level 1 Level 2 Level 3 (in millions) Financial assets: Short-term financial assets, net of allowance for credit losses $ 29,062 $ 29,062 $ 725 $ 28,334 $ 3 Federal funds sold and securities purchased under agreements to resell 4,310 4,310 — 4,310 — Securities held-to-maturity, net of allowance for credit losses 17,238 17,036 2,798 14,238 — Commercial loans, net of allowance for credit losses 40,584 41,474 — — 41,474 Commercial loans held for sale 69 69 — 69 — Consumer loans, net of allowance for credit losses 20,871 19,208 — — 19,208 Consumer loans held for sale 2 2 — 2 — Financial liabilities: Short-term financial liabilities $ 7,656 $ 7,656 $ — $ 7,653 $ 3 Deposits 120,779 120,804 — 120,804 — Long-term debt 11,265 11,725 — 11,725 — December 31, 2023 Carrying Fair Level 1 Level 2 Level 3 (in millions) Financial assets: Short-term financial assets, net of allowance for credit losses $ 25,732 $ 25,732 $ 704 $ 25,015 $ 13 Federal funds sold and securities purchased under agreements to resell 13,878 13,878 — 13,878 — Securities held-to-maturity, net of allowance for credit losses 15,076 14,689 — 14,689 — Commercial loans, net of allowance for credit losses 39,383 40,557 — — 40,557 Commercial loans held for sale 89 89 — 89 — Consumer loans, net of allowance for credit losses 18,998 17,043 — — 17,043 Financial liabilities: Short-term financial liabilities $ 9,927 $ 9,927 $ — $ 9,914 $ 13 Deposits 119,462 119,465 — 119,465 — Long-term debt 11,122 11,645 — 11,645 —

New Accounting Pronouncements (

New Accounting Pronouncements (Tables)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
New Accounting Pronouncements	The following are new accounting pronouncements issued by the Financial Accounting Standards Board which will be adopted in future periods: Accounting Standards Update Summary of Guidance Financial Statement Impact Improvements to Reportable Segment Disclosures Issued November 2023 • Amends and adds certain disclosure requirements for reportable segments. • In particular, requires disclosure of a) significant segment expenses that are regularly provided to the chief operating decision maker ("CODM") and included within the reported measure of segment profit or loss; b) the title and position of the CODM; and c) an explanation of how the CODM uses the reported measure of segment profit or loss in assessing segment performance and deciding how to allocate resources. • Effective for annual periods beginning January 1, 2024, and interim periods beginning January 1, 2025. • The new guidance is required to be applied retrospectively. • While the adoption of this guidance will result in changes to existing disclosures, it will not have any impact on our financial position or results of operations. Improvements to Income Tax Disclosures Issued December 2023 • Eliminates, amends and adds certain disclosure requirements for income taxes. • In particular, requires the disaggregation of certain existing disclosures, including a) the effective tax rate reconciliation to be broken out into specific categories; b) income taxes paid and income tax expense to be broken out between federal, state and foreign; and c) income before income tax to be broken out between domestic and foreign. • Effective for annual periods beginning January 1, 2025, with early adoption permitted. • The new guidance should be applied prospectively, with a retrospective option. • While the adoption of this guidance will result in changes to existing disclosures, it will not have any impact on our financial position or results of operations.

Trading Assets and Liabilitie_2

Trading Assets and Liabilities - Summary (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Trading assets	[1]	$ 21,707	$ 22,115
Trading liabilities	[1]	2,837	3,485
U.S. Treasury
Debt and Equity Securities, FV-NI [Line Items]
Trading assets		4,038	3,564
U.S. Government agency issued or guaranteed
Debt and Equity Securities, FV-NI [Line Items]
Trading assets		1	1
U.S. Government sponsored enterprises
Debt and Equity Securities, FV-NI [Line Items]
Trading assets		1,228	1,207
Foreign bonds
Debt and Equity Securities, FV-NI [Line Items]
Trading assets		759	4,019
Equity securities
Debt and Equity Securities, FV-NI [Line Items]
Trading assets		14,344	11,702
Precious metals
Debt and Equity Securities, FV-NI [Line Items]
Trading assets		160	346
Trading liabilities		238	301
Securities sold, not yet purchased
Debt and Equity Securities, FV-NI [Line Items]
Trading liabilities		1,528	1,688
Derivative assets
Debt and Equity Securities, FV-NI [Line Items]
Trading assets		1,177	1,276
Derivatives liability
Debt and Equity Securities, FV-NI [Line Items]
Trading liabilities		$ 1,071	$ 1,496
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Trading Assets and Liabilitie_3

Trading Assets and Liabilities - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Derivatives included in trading assets, amount offset	$ 1,170		$ 1,170		$ 1,760
Derivatives included in trading liabilities, amount offset	1,511		1,511		1,321
Dividend income on equity securities held for trading	46	$ 41	133	$ 111
Trading Assets
Debt and Equity Securities, FV-NI [Line Items]
Derivatives included in trading assets, amount offset	889		889		1,416
Trading Liabilities
Debt and Equity Securities, FV-NI [Line Items]
Derivatives included in trading liabilities, amount offset	$ 1,511		$ 1,511		$ 1,321

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Asset Backed Securities (Detail) - USD ($)		Sep. 30, 2024	Dec. 31, 2023
Securities available-for-sale:
Amortized Cost		$ 27,746,000,000	$ 27,980,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		20,000,000	26,000,000
Unrealized Losses		(1,824,000,000)	(2,310,000,000)
Fair Value	[1]	25,942,000,000	25,696,000,000
Securities held-to-maturity:
Amortized Cost		17,238,000,000	15,076,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		103,000,000	47,000,000
Unrealized Losses		(305,000,000)	(434,000,000)
Fair Value		17,036,000,000	14,689,000,000
U.S. Treasury
Securities available-for-sale:
Amortized Cost		9,318,000,000	7,489,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		13,000,000	22,000,000
Unrealized Losses		(219,000,000)	(225,000,000)
Fair Value		9,112,000,000	7,286,000,000
Securities held-to-maturity:
Amortized Cost		2,797,000,000	1,917,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		7,000,000	1,000,000
Unrealized Losses		(6,000,000)	(18,000,000)
Fair Value		2,798,000,000	1,900,000,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Securities available-for-sale:
Amortized Cost		3,325,000,000	5,864,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		0	0
Unrealized Losses		(565,000,000)	(845,000,000)
Fair Value		2,760,000,000	5,019,000,000
Securities held-to-maturity:
Amortized Cost		1,020,000,000	1,069,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		0	0
Unrealized Losses		(46,000,000)	(68,000,000)
Fair Value		974,000,000	1,001,000,000
Collateralized Mortgage Obligations, Issued by U.S. Government Sponsored Enterprises
Securities available-for-sale:
Amortized Cost		1,349,000,000	1,436,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		0	0
Unrealized Losses		(265,000,000)	(300,000,000)
Fair Value		1,084,000,000	1,136,000,000
Securities held-to-maturity:
Amortized Cost		257,000,000	297,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		4,000,000	3,000,000
Unrealized Losses		(10,000,000)	(16,000,000)
Fair Value		251,000,000	284,000,000
Direct Agency Obligations U S Government Sponsored Enterprises
Securities available-for-sale:
Amortized Cost		1,406,000,000	1,719,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		1,000,000	0
Unrealized Losses		(7,000,000)	(38,000,000)
Fair Value		1,400,000,000	1,681,000,000
Mortgage-backed Securities, Issued or Guaranteed by US Government Agency
Securities available-for-sale:
Amortized Cost		5,430,000,000	5,804,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		2,000,000	1,000,000
Unrealized Losses		(318,000,000)	(378,000,000)
Fair Value		5,114,000,000	5,427,000,000
Securities held-to-maturity:
Amortized Cost		11,594,000,000	10,043,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		92,000,000	43,000,000
Unrealized Losses		(130,000,000)	(180,000,000)
Fair Value		11,556,000,000	9,906,000,000
Collateralized Mortgage Obligations, Issued or Guaranteed by US Government Agency
Securities available-for-sale:
Amortized Cost		2,668,000,000	2,865,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		0	0
Unrealized Losses		(438,000,000)	(506,000,000)
Fair Value		2,230,000,000	2,359,000,000
Securities held-to-maturity:
Amortized Cost		1,567,000,000	1,745,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		0	0
Unrealized Losses		(113,000,000)	(152,000,000)
Fair Value		1,454,000,000	1,593,000,000
Direct Agency Obligations, Issued or Guaranteed by US Government Agency
Securities available-for-sale:
Amortized Cost		167,000,000	215,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		3,000,000	3,000,000
Unrealized Losses		0	(3,000,000)
Fair Value		170,000,000	215,000,000
Home equity asset-backed securities
Securities available-for-sale:
Amortized Cost		11,000,000	13,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		0	0
Unrealized Losses		(1,000,000)	(1,000,000)
Fair Value		10,000,000	12,000,000
Other asset-backed securities
Securities available-for-sale:
Amortized Cost		102,000,000	103,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		0	0
Unrealized Losses		(10,000,000)	(11,000,000)
Fair Value		92,000,000	92,000,000
Foreign debt securities
Securities available-for-sale:
Amortized Cost		3,970,000,000	2,472,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		1,000,000	0
Unrealized Losses		(1,000,000)	(3,000,000)
Fair Value		3,970,000,000	2,469,000,000
Obligations of U.S. states and political subdivisions
Securities held-to-maturity:
Amortized Cost		3,000,000	4,000,000
Allowance for Credit Losses		0	0
Unrealized Gains		0	0
Unrealized Losses		0	0
Fair Value		$ 3,000,000	4,000,000
Asset-backed securities collateralized by residential mortgages
Securities held-to-maturity:
Amortized Cost			1,000,000
Allowance for Credit Losses			0
Unrealized Gains			0
Unrealized Losses			0
Fair Value			$ 1,000,000
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Securities - Narrative (Detail)

Securities - Narrative (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, allowance for credit losses	$ 0		$ 0		$ 0
Securities held-to-maturity, allowance for credit losses	0		0		0
Securities held-to-maturity	17,238,000,000		17,238,000,000		15,076,000,000
Debt securities, available-for-sale, realized loss	149,000,000	$ 0	153,000,000	$ 0
Securities held-to-maturity, nonaccrual	0		0		0
Equity securities without readily determinable fair values, impairment loss adjustment			4,000,000	$ 4,000,000
U.S. Government sponsored mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, sold	2,130,000,000
Debt securities, available-for-sale, realized loss	148,000,000
Total Past Due 30 Days or More
Debt Securities, Available-for-sale [Line Items]
Securities held-to-maturity	0		0		0
Other assets
Debt Securities, Available-for-sale [Line Items]
Federal Home Loan Bank stock	95,000,000		95,000,000		95,000,000
Federal Reserve Bank stock	$ 438,000,000		$ 438,000,000		$ 438,000,000

Securities - Gross Unrealized L

Securities - Gross Unrealized Losses and Related Fair Values (Detail) $ in Millions	Sep. 30, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Number of securities available for sale in one year or less | security	31	22
Securities available-for-sale gross unrealized losses one year or less	$ (10)	$ (2)
Securities available-for-sale aggregate fair value of investment one year or less	$ 4,719	$ 2,889
Number of Securities available for sale greater than one year | security	325	495
Securities available-for-sale gross unrealized losses greater than one year	$ (1,814)	$ (2,308)
Securities available-for-sale aggregate fair value of investment greater than one year	$ 15,970	$ 20,659
U.S. Treasury
Debt Securities, Available-for-sale [Line Items]
Number of securities available for sale in one year or less | security	12	3
Securities available-for-sale gross unrealized losses one year or less	$ (9)	$ (1)
Securities available-for-sale aggregate fair value of investment one year or less	$ 3,118	$ 1,008
Number of Securities available for sale greater than one year | security	38	41
Securities available-for-sale gross unrealized losses greater than one year	$ (210)	$ (224)
Securities available-for-sale aggregate fair value of investment greater than one year	$ 4,288	$ 4,906
U.S. Government sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Number of securities available for sale in one year or less | security	1	2
Securities available-for-sale gross unrealized losses one year or less	$ 0	$ 0
Securities available-for-sale aggregate fair value of investment one year or less	$ 71	$ 80
Number of Securities available for sale greater than one year | security	143	293
Securities available-for-sale gross unrealized losses greater than one year	$ (837)	$ (1,183)
Securities available-for-sale aggregate fair value of investment greater than one year	$ 4,735	$ 7,701
U.S. Government agency issued or guaranteed
Debt Securities, Available-for-sale [Line Items]
Number of securities available for sale in one year or less | security	0	0
Securities available-for-sale gross unrealized losses one year or less	$ 0	$ 0
Securities available-for-sale aggregate fair value of investment one year or less	$ 0	$ 0
Number of Securities available for sale greater than one year | security	137	151
Securities available-for-sale gross unrealized losses greater than one year	$ (756)	$ (887)
Securities available-for-sale aggregate fair value of investment greater than one year	$ 6,794	$ 7,765
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Number of securities available for sale in one year or less | security	0	0
Securities available-for-sale gross unrealized losses one year or less	$ 0	$ 0
Securities available-for-sale aggregate fair value of investment one year or less	$ 0	$ 0
Number of Securities available for sale greater than one year | security	6	6
Securities available-for-sale gross unrealized losses greater than one year	$ (11)	$ (12)
Securities available-for-sale aggregate fair value of investment greater than one year	$ 103	$ 104
Foreign debt securities
Debt Securities, Available-for-sale [Line Items]
Number of securities available for sale in one year or less | security	18	17
Securities available-for-sale gross unrealized losses one year or less	$ (1)	$ (1)
Securities available-for-sale aggregate fair value of investment one year or less	$ 1,530	$ 1,801
Number of Securities available for sale greater than one year | security	1	4
Securities available-for-sale gross unrealized losses greater than one year	$ 0	$ (2)
Securities available-for-sale aggregate fair value of investment greater than one year	$ 50	$ 183

Securities - Realized Gains and

Securities - Realized Gains and Losses on Investment Securities Transactions Attributable to Available-for-sale Securities (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 1	$ 0	$ 15	$ 3
Gross realized losses	(149)	0	(153)	0
Net realized gains (losses)	$ (148)	$ 0	$ (138)	$ 3

Securities - Distribution of Ma

Securities - Distribution of Maturities of Debt Securities with Approximate Yield of Portfolio (Detail) $ in Millions	Sep. 30, 2024 USD ($)
Debt Securities, Available-for-sale [Line Items]
Available-for-sale amount within one year	$ 2,667
Available-for-sale yield within one year (percent)	0.58%
Available-for-sale amount after one but within five years	$ 6,101
Available-for-sale yield after one but within five years (percent)	2.95%
Available-for-sale amount after five but within ten years	$ 3,170
Available-for-sale yield after five but within ten years (percent)	3.55%
Available-for-sale amount after ten years	$ 15,808
Available-for-sale yield after ten years (percent)	2.54%
Total fair value within one year	$ 2,664
Total fair value after one but within five years	6,057
Total fair value after five but within ten years	3,153
Total fair value after ten years	14,068
Held-to-maturity amount within one year	$ 85
Held-to-maturity yield within one year (percent)	2.32%
Held-to-maturity amount after one but within five years	$ 2,270
Held-to-maturity yield after one but within five years (percent)	3.57%
Held-to-maturity after five but within ten years	$ 1,371
Held-to-maturity yield after five but within ten years (percent)	3.73%
Held-to-maturity after ten years	$ 13,512
Held-to-maturity yield after ten years (percent)	4.48%
Total fair value within one year	$ 85
Total fair value after one but within five years	2,266
Total fair value after five but within ten years	1,346
Total fair value after ten years	13,339
U.S. Treasury
Debt Securities, Available-for-sale [Line Items]
Available-for-sale amount within one year	$ 243
Available-for-sale yield within one year (percent)	0.98%
Available-for-sale amount after one but within five years	$ 3,815
Available-for-sale yield after one but within five years (percent)	2.17%
Available-for-sale amount after five but within ten years	$ 2,380
Available-for-sale yield after five but within ten years (percent)	3.97%
Available-for-sale amount after ten years	$ 2,880
Available-for-sale yield after ten years (percent)	2.65%
Held-to-maturity amount within one year	$ 0
Held-to-maturity yield within one year (percent)	0%
Held-to-maturity amount after one but within five years	$ 2,048
Held-to-maturity yield after one but within five years (percent)	3.65%
Held-to-maturity after five but within ten years	$ 749
Held-to-maturity yield after five but within ten years (percent)	3.71%
Held-to-maturity after ten years	$ 0
Held-to-maturity yield after ten years (percent)	0%
U.S. Government sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Available-for-sale amount within one year	$ 579
Available-for-sale yield within one year (percent)	1.15%
Available-for-sale amount after one but within five years	$ 178
Available-for-sale yield after one but within five years (percent)	2.99%
Available-for-sale amount after five but within ten years	$ 650
Available-for-sale yield after five but within ten years (percent)	1.97%
Available-for-sale amount after ten years	$ 4,673
Available-for-sale yield after ten years (percent)	1.80%
Held-to-maturity amount within one year	$ 84
Held-to-maturity yield within one year (percent)	2.30%
Held-to-maturity amount after one but within five years	$ 219
Held-to-maturity yield after one but within five years (percent)	2.82%
Held-to-maturity after five but within ten years	$ 610
Held-to-maturity yield after five but within ten years (percent)	3.70%
Held-to-maturity after ten years	$ 364
Held-to-maturity yield after ten years (percent)	2.86%
U.S. Government agency issued or guaranteed
Debt Securities, Available-for-sale [Line Items]
Available-for-sale amount within one year	$ 20
Available-for-sale yield within one year (percent)	0.81%
Available-for-sale amount after one but within five years	$ 0
Available-for-sale yield after one but within five years (percent)	0%
Available-for-sale amount after five but within ten years	$ 2
Available-for-sale yield after five but within ten years (percent)	4.65%
Available-for-sale amount after ten years	$ 8,243
Available-for-sale yield after ten years (percent)	2.92%
Held-to-maturity amount within one year	$ 0
Held-to-maturity yield within one year (percent)	0%
Held-to-maturity amount after one but within five years	$ 1
Held-to-maturity yield after one but within five years (percent)	3.94%
Held-to-maturity after five but within ten years	$ 12
Held-to-maturity yield after five but within ten years (percent)	5.91%
Held-to-maturity after ten years	$ 13,148
Held-to-maturity yield after ten years (percent)	4.52%
Obligations of U.S. states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Held-to-maturity amount within one year	$ 1
Held-to-maturity yield within one year (percent)	4.04%
Held-to-maturity amount after one but within five years	$ 2
Held-to-maturity yield after one but within five years (percent)	3.77%
Held-to-maturity after five but within ten years	$ 0
Held-to-maturity yield after five but within ten years (percent)	0%
Held-to-maturity after ten years	$ 0
Held-to-maturity yield after ten years (percent)	0%
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale amount within one year	$ 0
Available-for-sale yield within one year (percent)	0%
Available-for-sale amount after one but within five years	$ 54
Available-for-sale yield after one but within five years (percent)	4.40%
Available-for-sale amount after five but within ten years	$ 47
Available-for-sale yield after five but within ten years (percent)	3.93%
Available-for-sale amount after ten years	$ 12
Available-for-sale yield after ten years (percent)	4.85%
Foreign debt securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale amount within one year	$ 1,825
Available-for-sale yield within one year (percent)	0.34%
Available-for-sale amount after one but within five years	$ 2,054
Available-for-sale yield after one but within five years (percent)	4.36%
Available-for-sale amount after five but within ten years	$ 91
Available-for-sale yield after five but within ten years (percent)	3.81%
Available-for-sale amount after ten years	$ 0
Available-for-sale yield after ten years (percent)	0%

Securities - Equity Securities

Securities - Equity Securities That Are Not Classified as Trading (Details) - Other assets - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Equity securities carried at fair value	$ 260	$ 270
Equity securities without readily determinable fair values	$ 12	$ 13

Loans - Components of Loans (De

Loans - Components of Loans (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	[1]	$ 62,014	$ 58,987
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		41,115	39,957
Commercial loans | Real estate, including construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		6,795	7,087
Commercial loans | Business and corporate banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		16,420	15,724
Commercial loans | Global banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		10,573	10,725
Commercial loans | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		7,327	6,421
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		20,899	19,030
Consumer loans | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		20,235	18,341
Consumer loans | Home equity mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		393	389
Consumer loans | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		185	199
Consumer loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		86	101
Consumer loans | Student loans held for investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, designated under fair value option		12	15
Affiliates | Commercial loans | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		3,784	2,618
Other | Commercial loans | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		$ 3,543	$ 3,803
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Loans - Narrative (Detail)

Loans - Narrative (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred origination costs (fees)		$ 27		$ 27		$ 17
Net unamortized premium (discount)		(8)		(8)		(13)
Interest income that was recorded on nonaccrual loans and included in interest income during the period		11	$ 0	19	$ 3
Loans modified			57	313	316
Loans, net	[1]	62,014		62,014		58,987
Interest only residential mortgage loans		4,564		4,564		4,392
90+ Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified, subsequently default			0		0
Loans, net		222		222		309
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified		0	2	1	11
Loans, net		20,899		20,899		19,030
Consumer loans | 90+ Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified, subsequently default		0		0
Loans, net		105		105		99
Consumer loans | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral-dependent loans		287		287		278
Loans modified			2	1	11
Loans, net		20,235		20,235		18,341
Consumer loans | Residential mortgages | 90+ Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		96		96		91
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral-dependent loans		611		611		618
Loans modified		82	$ 55	312	$ 305
Additional commitments for loans modified		43		43		85
Loans, net		41,115		41,115		39,957
Commercial loans | 90+ Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified, subsequently default		0		1
Loans, net		$ 117		$ 117		$ 210
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Loans - Summary of Past Due Sta

Loans - Summary of Past Due Status of Loans (Detail) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans, net	[1]	$ 62,014	$ 58,987
Commercial loans
Financing Receivable, Past Due [Line Items]
Loans, net		41,115	39,957
Commercial loans | Real estate, including construction
Financing Receivable, Past Due [Line Items]
Loans, net		6,795	7,087
Commercial loans | Business and corporate banking
Financing Receivable, Past Due [Line Items]
Loans, net		16,420	15,724
Commercial loans | Global banking
Financing Receivable, Past Due [Line Items]
Loans, net		10,573	10,725
Commercial loans | Other commercial
Financing Receivable, Past Due [Line Items]
Loans, net		7,327	6,421
Consumer loans
Financing Receivable, Past Due [Line Items]
Loans, net		20,899	19,030
Consumer loans | Residential mortgages
Financing Receivable, Past Due [Line Items]
Loans, net		20,235	18,341
Consumer loans | Home equity mortgages
Financing Receivable, Past Due [Line Items]
Loans, net		393	389
Consumer loans | Credit cards
Financing Receivable, Past Due [Line Items]
Loans, net		185	199
Consumer loans | Other consumer
Financing Receivable, Past Due [Line Items]
Loans, net		86	101
Total Past Due 30 Days or More
Financing Receivable, Past Due [Line Items]
Loans, net		585	852
Total Past Due 30 Days or More | Commercial loans
Financing Receivable, Past Due [Line Items]
Loans, net		301	561
Total Past Due 30 Days or More | Commercial loans | Real estate, including construction
Financing Receivable, Past Due [Line Items]
Loans, net		21	206
Total Past Due 30 Days or More | Commercial loans | Business and corporate banking
Financing Receivable, Past Due [Line Items]
Loans, net		51	4
Total Past Due 30 Days or More | Commercial loans | Global banking
Financing Receivable, Past Due [Line Items]
Loans, net		47	1
Total Past Due 30 Days or More | Commercial loans | Other commercial
Financing Receivable, Past Due [Line Items]
Loans, net		182	350
Total Past Due 30 Days or More | Consumer loans
Financing Receivable, Past Due [Line Items]
Loans, net		284	291
Total Past Due 30 Days or More | Consumer loans | Residential mortgages
Financing Receivable, Past Due [Line Items]
Loans, net		268	265
Total Past Due 30 Days or More | Consumer loans | Home equity mortgages
Financing Receivable, Past Due [Line Items]
Loans, net		7	15
Total Past Due 30 Days or More | Consumer loans | Credit cards
Financing Receivable, Past Due [Line Items]
Loans, net		4	6
Total Past Due 30 Days or More | Consumer loans | Other consumer
Financing Receivable, Past Due [Line Items]
Loans, net		5	5
30 - 89 Days
Financing Receivable, Past Due [Line Items]
Loans, net		363	543
30 - 89 Days | Commercial loans
Financing Receivable, Past Due [Line Items]
Loans, net		184	351
30 - 89 Days | Commercial loans | Real estate, including construction
Financing Receivable, Past Due [Line Items]
Loans, net		0	0
30 - 89 Days | Commercial loans | Business and corporate banking
Financing Receivable, Past Due [Line Items]
Loans, net		2	1
30 - 89 Days | Commercial loans | Global banking
Financing Receivable, Past Due [Line Items]
Loans, net		0	0
30 - 89 Days | Commercial loans | Other commercial
Financing Receivable, Past Due [Line Items]
Loans, net		182	350
30 - 89 Days | Consumer loans
Financing Receivable, Past Due [Line Items]
Loans, net		179	192
30 - 89 Days | Consumer loans | Residential mortgages
Financing Receivable, Past Due [Line Items]
Loans, net		172	174
30 - 89 Days | Consumer loans | Home equity mortgages
Financing Receivable, Past Due [Line Items]
Loans, net		2	12
30 - 89 Days | Consumer loans | Credit cards
Financing Receivable, Past Due [Line Items]
Loans, net		2	3
30 - 89 Days | Consumer loans | Other consumer
Financing Receivable, Past Due [Line Items]
Loans, net		3	3
90+ Days
Financing Receivable, Past Due [Line Items]
Loans, net		222	309
90+ Days | Commercial loans
Financing Receivable, Past Due [Line Items]
Loans, net		117	210
90+ Days | Commercial loans | Real estate, including construction
Financing Receivable, Past Due [Line Items]
Loans, net		21	206
90+ Days | Commercial loans | Business and corporate banking
Financing Receivable, Past Due [Line Items]
Loans, net		49	3
90+ Days | Commercial loans | Global banking
Financing Receivable, Past Due [Line Items]
Loans, net		47	1
90+ Days | Commercial loans | Other commercial
Financing Receivable, Past Due [Line Items]
Loans, net		0	0
90+ Days | Consumer loans
Financing Receivable, Past Due [Line Items]
Loans, net		105	99
90+ Days | Consumer loans | Residential mortgages
Financing Receivable, Past Due [Line Items]
Loans, net		96	91
90+ Days | Consumer loans | Home equity mortgages
Financing Receivable, Past Due [Line Items]
Loans, net		5	3
90+ Days | Consumer loans | Credit cards
Financing Receivable, Past Due [Line Items]
Loans, net		2	3
90+ Days | Consumer loans | Other consumer
Financing Receivable, Past Due [Line Items]
Loans, net		2	2
Current
Financing Receivable, Past Due [Line Items]
Loans, net		61,429	58,135
Current | Commercial loans
Financing Receivable, Past Due [Line Items]
Loans, net		40,814	39,396
Current | Commercial loans | Real estate, including construction
Financing Receivable, Past Due [Line Items]
Loans, net		6,774	6,881
Current | Commercial loans | Business and corporate banking
Financing Receivable, Past Due [Line Items]
Loans, net		16,369	15,720
Current | Commercial loans | Global banking
Financing Receivable, Past Due [Line Items]
Loans, net		10,526	10,724
Current | Commercial loans | Other commercial
Financing Receivable, Past Due [Line Items]
Loans, net		7,145	6,071
Current | Consumer loans
Financing Receivable, Past Due [Line Items]
Loans, net		20,615	18,739
Current | Consumer loans | Residential mortgages
Financing Receivable, Past Due [Line Items]
Loans, net		19,967	18,076
Current | Consumer loans | Home equity mortgages
Financing Receivable, Past Due [Line Items]
Loans, net		386	374
Current | Consumer loans | Credit cards
Financing Receivable, Past Due [Line Items]
Loans, net		181	193
Current | Consumer loans | Other consumer
Financing Receivable, Past Due [Line Items]
Loans, net		$ 81	$ 96
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Loans - Summary of Nonaccrual L

Loans - Summary of Nonaccrual Loans and Accruing Receivables 90 Days or More Delinquent (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 761	$ 602
Accruing Loans Contractually Past Due 90 Days or More	4	6
Nonaccrual Loans With No Allowance For Credit Losses	136	205
Residential mortgage loans carried at lower of cost or fair value of the collateral less cost to sell	107	108
Commercial loans
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	593	424
Accruing Loans Contractually Past Due 90 Days or More	0	1
Nonaccrual Loans With No Allowance For Credit Losses	49	119
Commercial loans | Real estate, including construction
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	304	229
Accruing Loans Contractually Past Due 90 Days or More	0	0
Nonaccrual Loans With No Allowance For Credit Losses	0	40
Commercial loans | Business and corporate banking
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	59	143
Accruing Loans Contractually Past Due 90 Days or More	0	1
Nonaccrual Loans With No Allowance For Credit Losses	6	29
Commercial loans | Global banking
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	230	49
Accruing Loans Contractually Past Due 90 Days or More	0	0
Nonaccrual Loans With No Allowance For Credit Losses	43	48
Commercial loans | Other commercial
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	0	3
Accruing Loans Contractually Past Due 90 Days or More	0	0
Nonaccrual Loans With No Allowance For Credit Losses	0	2
Consumer loans
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	168	178
Accruing Loans Contractually Past Due 90 Days or More	4	5
Nonaccrual Loans With No Allowance For Credit Losses	87	86
Consumer loans | Residential mortgages
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	162	172
Accruing Loans Contractually Past Due 90 Days or More	0	0
Nonaccrual Loans With No Allowance For Credit Losses	82	81
Consumer loans | Home equity mortgages
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	6	6
Accruing Loans Contractually Past Due 90 Days or More	0	0
Nonaccrual Loans With No Allowance For Credit Losses	5	5
Consumer loans | Credit cards
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	0	0
Accruing Loans Contractually Past Due 90 Days or More	2	3
Nonaccrual Loans With No Allowance For Credit Losses	0	0
Consumer loans | Other consumer
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	0	0
Accruing Loans Contractually Past Due 90 Days or More	2	2
Nonaccrual Loans With No Allowance For Credit Losses	$ 0	$ 0

Loans - Loan Payment Modificati

Loans - Loan Payment Modifications by Type of Modification (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Modified [Line Items]
Loans modified		$ 57	$ 313	$ 316
% of Total Loans		0.10%	0.50%	0.50%
Commercial loans
Financing Receivable, Modified [Line Items]
Loans modified	$ 82	$ 55	$ 312	$ 305
% of Total Loans	0.20%	0.10%	0.80%	0.80%
Commercial loans | Real estate, including construction
Financing Receivable, Modified [Line Items]
Loans modified	$ 76	$ 2	$ 235	$ 172
% of Total Loans	1.10%	0%	3.50%	2.50%
Commercial loans | Business and corporate banking
Financing Receivable, Modified [Line Items]
Loans modified	$ 6	$ 53	$ 42	$ 128
% of Total Loans	0%	0.30%	0.30%	0.80%
Commercial loans | Global banking
Financing Receivable, Modified [Line Items]
Loans modified			$ 35	$ 5
% of Total Loans			0.30%	0.10%
Consumer loans
Financing Receivable, Modified [Line Items]
Loans modified	$ 0	$ 2	$ 1	$ 11
% of Total Loans		0%	0%	0.10%
Consumer loans | Residential mortgages
Financing Receivable, Modified [Line Items]
Loans modified		$ 2	$ 1	$ 11
% of Total Loans		0%	0%	0.10%
Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Loans modified		$ 0	$ 0	$ 0
Interest Rate Reduction | Commercial loans
Financing Receivable, Modified [Line Items]
Loans modified	0	0	0	0
Interest Rate Reduction | Commercial loans | Real estate, including construction
Financing Receivable, Modified [Line Items]
Loans modified	0	0	0	0
Interest Rate Reduction | Commercial loans | Business and corporate banking
Financing Receivable, Modified [Line Items]
Loans modified	0	0	0	0
Interest Rate Reduction | Commercial loans | Global banking
Financing Receivable, Modified [Line Items]
Loans modified			0	0
Interest Rate Reduction | Consumer loans
Financing Receivable, Modified [Line Items]
Loans modified		0	0	0
Interest Rate Reduction | Consumer loans | Residential mortgages
Financing Receivable, Modified [Line Items]
Loans modified		0	0	0
Principal Forgiveness
Financing Receivable, Modified [Line Items]
Loans modified		0	33	0
Principal Forgiveness | Commercial loans
Financing Receivable, Modified [Line Items]
Loans modified	33	0	33	0
Principal Forgiveness | Commercial loans | Real estate, including construction
Financing Receivable, Modified [Line Items]
Loans modified	33	0	33	0
Principal Forgiveness | Commercial loans | Business and corporate banking
Financing Receivable, Modified [Line Items]
Loans modified	0	0	0	0
Principal Forgiveness | Commercial loans | Global banking
Financing Receivable, Modified [Line Items]
Loans modified			0	0
Principal Forgiveness | Consumer loans
Financing Receivable, Modified [Line Items]
Loans modified		0	0	0
Principal Forgiveness | Consumer loans | Residential mortgages
Financing Receivable, Modified [Line Items]
Loans modified		0	0	0
Term Extension / Significant Payment Deferral
Financing Receivable, Modified [Line Items]
Loans modified		57	115	315
Term Extension / Significant Payment Deferral | Commercial loans
Financing Receivable, Modified [Line Items]
Loans modified	49	55	115	305
Term Extension / Significant Payment Deferral | Commercial loans | Real estate, including construction
Financing Receivable, Modified [Line Items]
Loans modified	43	2	43	172
Term Extension / Significant Payment Deferral | Commercial loans | Business and corporate banking
Financing Receivable, Modified [Line Items]
Loans modified	6	53	37	128
Term Extension / Significant Payment Deferral | Commercial loans | Global banking
Financing Receivable, Modified [Line Items]
Loans modified			35	5
Term Extension / Significant Payment Deferral | Consumer loans
Financing Receivable, Modified [Line Items]
Loans modified		2	0	10
Term Extension / Significant Payment Deferral | Consumer loans | Residential mortgages
Financing Receivable, Modified [Line Items]
Loans modified		2	0	10
Combination
Financing Receivable, Modified [Line Items]
Loans modified		0	165	1
Combination | Commercial loans
Financing Receivable, Modified [Line Items]
Loans modified	0	0	164	0
Combination | Commercial loans | Real estate, including construction
Financing Receivable, Modified [Line Items]
Loans modified	0	0	159	0
Combination | Commercial loans | Business and corporate banking
Financing Receivable, Modified [Line Items]
Loans modified	$ 0	0	5	0
Combination | Commercial loans | Global banking
Financing Receivable, Modified [Line Items]
Loans modified			0	0
Combination | Consumer loans
Financing Receivable, Modified [Line Items]
Loans modified		0	1	1
Combination | Consumer loans | Residential mortgages
Financing Receivable, Modified [Line Items]
Loans modified		$ 0	$ 1	$ 1

Loans - Summary of the Financia

Loans - Summary of the Financial Effect of Loan Payment Modifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Commercial loans | Real estate, including construction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	0%	0%	5.60%	0%
Weighted-Average Term Extension / Payment Deferral (in years)	2 years 2 months 12 days	2 months 12 days	3 years 1 month 6 days	4 months 24 days
Commercial loans | Real estate, including construction | Principal Forgiven
Financing Receivable, Modified [Line Items]
Principal Forgiven (in millions)	$ 0	$ 0	$ 0	$ 0
Commercial loans | Business and corporate banking
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	0%	0%	0.30%	0%
Weighted-Average Term Extension / Payment Deferral (in years)	1 year 7 months 6 days	1 year 1 month 6 days	1 year 8 months 12 days	1 year 10 months 24 days
Commercial loans | Business and corporate banking | Principal Forgiven
Financing Receivable, Modified [Line Items]
Principal Forgiven (in millions)	$ 0	$ 0	$ 0	$ 2
Commercial loans | Global banking
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction			0%	0%
Weighted-Average Term Extension / Payment Deferral (in years)			2 years	2 years
Commercial loans | Global banking | Principal Forgiven
Financing Receivable, Modified [Line Items]
Principal Forgiven (in millions)			$ 0	$ 0
Consumer loans | Residential mortgages
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction		0%	0.50%	2.20%
Weighted-Average Term Extension / Payment Deferral (in years)		9 months 18 days	7 months 6 days	2 years
Consumer loans | Residential mortgages | Principal Forgiven
Financing Receivable, Modified [Line Items]
Principal Forgiven (in millions)		$ 0	$ 0	$ 0

Loans - Summary of Subsequently

Loans - Summary of Subsequently Delinquent Loans With Payment Modifications (Details) - 90+ Days - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default		$ 0		$ 0
Commercial loans
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default	$ 0		$ 1
Commercial loans | Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default			0
Commercial loans | Principal Forgiveness
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default			0
Commercial loans | Term Extension / Significant Payment Deferral
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default			1
Commercial loans | Combination
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default			0
Commercial loans | Global banking
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default			1
Commercial loans | Global banking | Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default			0
Commercial loans | Global banking | Principal Forgiveness
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default			0
Commercial loans | Global banking | Term Extension / Significant Payment Deferral
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default			1
Commercial loans | Global banking | Combination
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default			0
Consumer loans
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default	$ 0		$ 0

Loans - Summary of Past Due S_2

Loans - Summary of Past Due Status of Loans With Payment Modifications (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Modified loans, past due	$ 585	$ 628
30 - 89 Days
Financing Receivable, Past Due [Line Items]
Modified loans, past due	1	0
90+ Days
Financing Receivable, Past Due [Line Items]
Modified loans, past due	0	166
Current
Financing Receivable, Past Due [Line Items]
Modified loans, past due	584	462
Commercial loans
Financing Receivable, Past Due [Line Items]
Modified loans, past due	577	616
Commercial loans | Real estate, including construction
Financing Receivable, Past Due [Line Items]
Modified loans, past due	236	168
Commercial loans | Business and corporate banking
Financing Receivable, Past Due [Line Items]
Modified loans, past due	267	398
Commercial loans | Global banking
Financing Receivable, Past Due [Line Items]
Modified loans, past due	74	50
Commercial loans | 30 - 89 Days
Financing Receivable, Past Due [Line Items]
Modified loans, past due	0	0
Commercial loans | 30 - 89 Days | Real estate, including construction
Financing Receivable, Past Due [Line Items]
Modified loans, past due	0	0
Commercial loans | 30 - 89 Days | Business and corporate banking
Financing Receivable, Past Due [Line Items]
Modified loans, past due	0	0
Commercial loans | 30 - 89 Days | Global banking
Financing Receivable, Past Due [Line Items]
Modified loans, past due	0	0
Commercial loans | 90+ Days
Financing Receivable, Past Due [Line Items]
Modified loans, past due	0	166
Commercial loans | 90+ Days | Real estate, including construction
Financing Receivable, Past Due [Line Items]
Modified loans, past due	0	166
Commercial loans | 90+ Days | Business and corporate banking
Financing Receivable, Past Due [Line Items]
Modified loans, past due	0	0
Commercial loans | 90+ Days | Global banking
Financing Receivable, Past Due [Line Items]
Modified loans, past due	0	0
Commercial loans | Current
Financing Receivable, Past Due [Line Items]
Modified loans, past due	577	450
Commercial loans | Current | Real estate, including construction
Financing Receivable, Past Due [Line Items]
Modified loans, past due	236	2
Commercial loans | Current | Business and corporate banking
Financing Receivable, Past Due [Line Items]
Modified loans, past due	267	398
Commercial loans | Current | Global banking
Financing Receivable, Past Due [Line Items]
Modified loans, past due	74	50
Consumer loans
Financing Receivable, Past Due [Line Items]
Modified loans, past due	8	12
Consumer loans | Residential mortgages
Financing Receivable, Past Due [Line Items]
Modified loans, past due	8	12
Consumer loans | 30 - 89 Days
Financing Receivable, Past Due [Line Items]
Modified loans, past due	1	0
Consumer loans | 30 - 89 Days | Residential mortgages
Financing Receivable, Past Due [Line Items]
Modified loans, past due	1	0
Consumer loans | 90+ Days
Financing Receivable, Past Due [Line Items]
Modified loans, past due	0	0
Consumer loans | 90+ Days | Residential mortgages
Financing Receivable, Past Due [Line Items]
Modified loans, past due	0	0
Consumer loans | Current
Financing Receivable, Past Due [Line Items]
Modified loans, past due	7	12
Consumer loans | Current | Residential mortgages
Financing Receivable, Past Due [Line Items]
Modified loans, past due	$ 7	$ 12

Loans - Summary of Criticized A

Loans - Summary of Criticized Assets for Commercial Loans (Detail) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total	[1]	$ 62,014	$ 58,987
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		3,253	4,656
One year prior to current year		4,307	3,868
Two years prior to current year		3,446	3,250
Three years prior to current year		3,128	1,388
Four years prior to current year		1,040	2,354
Prior		12,451	11,069
Revolving Loans		13,179	13,054
Revolving Loans Converted to Term Loans		311	318
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		41,115	39,957
Commercial loans | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		638	920
One year prior to current year		1,039	1,286
Two years prior to current year		1,217	1,019
Three years prior to current year		883	355
Four years prior to current year		262	1,054
Prior		2,715	2,409
Revolving Loans		38	41
Revolving Loans Converted to Term Loans		3	3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		6,795	7,087
Commercial loans | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		1,409	1,270
One year prior to current year		1,356	1,148
Two years prior to current year		1,118	1,074
Three years prior to current year		1,261	231
Four years prior to current year		176	561
Prior		4,096	4,253
Revolving Loans		6,696	6,922
Revolving Loans Converted to Term Loans		308	265
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		16,420	15,724
Commercial loans | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		935	2,255
One year prior to current year		1,768	1,153
Two years prior to current year		849	844
Three years prior to current year		660	151
Four years prior to current year		116	321
Prior		4,495	3,600
Revolving Loans		1,750	2,351
Revolving Loans Converted to Term Loans		0	50
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		10,573	10,725
Commercial loans | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		271	211
One year prior to current year		144	281
Two years prior to current year		262	313
Three years prior to current year		324	651
Four years prior to current year		486	418
Prior		1,145	807
Revolving Loans		4,695	3,740
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		7,327	6,421
Commercial loans | Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		316	115
One year prior to current year		252	366
Two years prior to current year		316	48
Three years prior to current year		96	136
Four years prior to current year		24	126
Prior		1,436	1,479
Revolving Loans		1,013	1,273
Revolving Loans Converted to Term Loans		17	12
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		3,470	3,555
Commercial loans | Criticized | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	2
One year prior to current year		0	40
Two years prior to current year		168	0
Three years prior to current year		33	105
Four years prior to current year		0	92
Prior		788	1,029
Revolving Loans		20	21
Revolving Loans Converted to Term Loans		0	3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		1,009	1,292
Commercial loans | Criticized | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		316	69
One year prior to current year		252	125
Two years prior to current year		148	48
Three years prior to current year		63	31
Four years prior to current year		4	20
Prior		382	291
Revolving Loans		781	1,113
Revolving Loans Converted to Term Loans		17	9
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		1,963	1,706
Commercial loans | Criticized | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	201
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		20	14
Prior		266	159
Revolving Loans		212	136
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		498	510
Commercial loans | Criticized | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			44
One year prior to current year			0
Two years prior to current year			0
Three years prior to current year			0
Four years prior to current year			0
Prior			0
Revolving Loans			3
Revolving Loans Converted to Term Loans			0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total			47
Commercial loans | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		172	44
One year prior to current year		128	143
Two years prior to current year		208	12
Three years prior to current year		20	108
Four years prior to current year		4	112
Prior		237	213
Revolving Loans		185	361
Revolving Loans Converted to Term Loans		11	11
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		965	1,004
Commercial loans | Special mention | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	40
Two years prior to current year		104	0
Three years prior to current year		0	104
Four years prior to current year		0	92
Prior		18	42
Revolving Loans		0	3
Revolving Loans Converted to Term Loans		0	3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		122	284
Commercial loans | Special mention | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		172	38
One year prior to current year		128	103
Two years prior to current year		104	12
Three years prior to current year		20	4
Four years prior to current year		4	20
Prior		219	126
Revolving Loans		148	296
Revolving Loans Converted to Term Loans		11	8
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		806	607
Commercial loans | Special mention | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		0	45
Revolving Loans		37	62
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		37	107
Commercial loans | Special mention | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			6
One year prior to current year			0
Two years prior to current year			0
Three years prior to current year			0
Four years prior to current year			0
Prior			0
Revolving Loans			0
Revolving Loans Converted to Term Loans			0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total			6
Commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		138	71
One year prior to current year		118	36
Two years prior to current year		108	0
Three years prior to current year		43	28
Four years prior to current year		20	0
Prior		764	1,091
Revolving Loans		759	819
Revolving Loans Converted to Term Loans		6	1
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		1,956	2,046
Commercial loans | Substandard | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	2
One year prior to current year		0	0
Two years prior to current year		64	0
Three years prior to current year		0	1
Four years prior to current year		0	0
Prior		521	821
Revolving Loans		0	0
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		585	824
Commercial loans | Substandard | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		138	31
One year prior to current year		118	22
Two years prior to current year		44	0
Three years prior to current year		43	27
Four years prior to current year		0	0
Prior		157	156
Revolving Loans		593	746
Revolving Loans Converted to Term Loans		6	1
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		1,099	983
Commercial loans | Substandard | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	14
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		20	0
Prior		86	114
Revolving Loans		166	73
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		272	201
Commercial loans | Substandard | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			38
One year prior to current year			0
Two years prior to current year			0
Three years prior to current year			0
Four years prior to current year			0
Prior			0
Revolving Loans			0
Revolving Loans Converted to Term Loans			0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total			38
Commercial loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		6	0
One year prior to current year		6	187
Two years prior to current year		0	36
Three years prior to current year		33	0
Four years prior to current year		0	14
Prior		435	175
Revolving Loans		69	93
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		549	505
Commercial loans | Doubtful | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		33	0
Four years prior to current year		0	0
Prior		249	166
Revolving Loans		20	18
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		302	184
Commercial loans | Doubtful | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		6	0
One year prior to current year		6	0
Two years prior to current year		0	36
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		6	9
Revolving Loans		40	71
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		58	116
Commercial loans | Doubtful | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	187
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	14
Prior		180	0
Revolving Loans		9	1
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		$ 189	202
Commercial loans | Doubtful | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			0
One year prior to current year			0
Two years prior to current year			0
Three years prior to current year			0
Four years prior to current year			0
Prior			0
Revolving Loans			3
Revolving Loans Converted to Term Loans			0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total			$ 3
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Loans - Status of Loan Portfoli

Loans - Status of Loan Portfolios (Detail) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total	[1]	$ 62,014	$ 58,987
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		3,253	4,656
One year prior to current year		4,307	3,868
Two years prior to current year		3,446	3,250
Three years prior to current year		3,128	1,388
Four years prior to current year		1,040	2,354
Prior		12,451	11,069
Revolving Loans		13,179	13,054
Revolving Loans Converted to Term Loans		311	318
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		41,115	39,957
Commercial loans | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		638	920
One year prior to current year		1,039	1,286
Two years prior to current year		1,217	1,019
Three years prior to current year		883	355
Four years prior to current year		262	1,054
Prior		2,715	2,409
Revolving Loans		38	41
Revolving Loans Converted to Term Loans		3	3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		6,795	7,087
Commercial loans | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		1,409	1,270
One year prior to current year		1,356	1,148
Two years prior to current year		1,118	1,074
Three years prior to current year		1,261	231
Four years prior to current year		176	561
Prior		4,096	4,253
Revolving Loans		6,696	6,922
Revolving Loans Converted to Term Loans		308	265
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		16,420	15,724
Commercial loans | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		935	2,255
One year prior to current year		1,768	1,153
Two years prior to current year		849	844
Three years prior to current year		660	151
Four years prior to current year		116	321
Prior		4,495	3,600
Revolving Loans		1,750	2,351
Revolving Loans Converted to Term Loans		0	50
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		10,573	10,725
Commercial loans | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		271	211
One year prior to current year		144	281
Two years prior to current year		262	313
Three years prior to current year		324	651
Four years prior to current year		486	418
Prior		1,145	807
Revolving Loans		4,695	3,740
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		7,327	6,421
Commercial loans | Performing loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		3,247	4,656
One year prior to current year		4,301	3,833
Two years prior to current year		3,446	3,250
Three years prior to current year		3,095	1,388
Four years prior to current year		1,040	2,314
Prior		11,973	10,822
Revolving Loans		13,109	12,951
Revolving Loans Converted to Term Loans		311	318
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		40,522	39,532
Commercial loans | Performing loans | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		638	920
One year prior to current year		1,039	1,286
Two years prior to current year		1,217	1,019
Three years prior to current year		850	355
Four years prior to current year		262	1,014
Prior		2,464	2,242
Revolving Loans		18	19
Revolving Loans Converted to Term Loans		3	3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		6,491	6,858
Commercial loans | Performing loans | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		1,403	1,270
One year prior to current year		1,350	1,113
Two years prior to current year		1,118	1,074
Three years prior to current year		1,261	231
Four years prior to current year		176	561
Prior		4,090	4,215
Revolving Loans		6,655	6,851
Revolving Loans Converted to Term Loans		308	265
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		16,361	15,580
Commercial loans | Performing loans | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		935	2,255
One year prior to current year		1,768	1,153
Two years prior to current year		849	844
Three years prior to current year		660	151
Four years prior to current year		116	321
Prior		4,274	3,561
Revolving Loans		1,741	2,341
Revolving Loans Converted to Term Loans		0	50
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		10,343	10,676
Commercial loans | Performing loans | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		271	211
One year prior to current year		144	281
Two years prior to current year		262	313
Three years prior to current year		324	651
Four years prior to current year		486	418
Prior		1,145	804
Revolving Loans		4,695	3,740
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		7,327	6,418
Commercial loans | Nonaccrual loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		6	0
One year prior to current year		6	35
Two years prior to current year		0	0
Three years prior to current year		33	0
Four years prior to current year		0	40
Prior		478	247
Revolving Loans		70	102
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		593	424
Commercial loans | Nonaccrual loans | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		33	0
Four years prior to current year		0	40
Prior		251	167
Revolving Loans		20	22
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		304	229
Commercial loans | Nonaccrual loans | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		6	0
One year prior to current year		6	35
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		6	38
Revolving Loans		41	70
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		59	143
Commercial loans | Nonaccrual loans | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		221	39
Revolving Loans		9	10
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		230	49
Commercial loans | Nonaccrual loans | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		0	3
Revolving Loans		0	0
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		0	3
Commercial loans | Accruing loans contractually past due 90 days or more
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			0
One year prior to current year			0
Two years prior to current year			0
Three years prior to current year			0
Four years prior to current year			0
Prior			0
Revolving Loans			1
Revolving Loans Converted to Term Loans			0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total			1
Commercial loans | Accruing loans contractually past due 90 days or more | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			0
One year prior to current year			0
Two years prior to current year			0
Three years prior to current year			0
Four years prior to current year			0
Prior			0
Revolving Loans			1
Revolving Loans Converted to Term Loans			0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total			1
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		3,034	2,726
One year prior to current year		2,523	2,841
Two years prior to current year		2,731	4,125
Three years prior to current year		3,984	2,799
Four years prior to current year		2,672	1,272
Prior		5,765	5,061
Revolving Loans		190	206
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		20,899	19,030
Consumer loans | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		2,996	2,646
One year prior to current year		2,443	2,764
Two years prior to current year		2,660	4,107
Three years prior to current year		3,965	2,770
Four years prior to current year		2,649	1,244
Prior		5,522	4,810
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		20,235	18,341
Consumer loans | Home equity mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		38	80
One year prior to current year		80	69
Two years prior to current year		67	11
Three years prior to current year		9	22
Four years prior to current year		18	25
Prior		181	182
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		393	389
Consumer loans | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		0	0
Revolving Loans		185	199
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		185	199
Consumer loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	8
Two years prior to current year		4	7
Three years prior to current year		10	7
Four years prior to current year		5	3
Prior		62	69
Revolving Loans		5	7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		86	101
Consumer loans | Performing loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		3,034	2,726
One year prior to current year		2,523	2,830
Two years prior to current year		2,724	4,114
Three years prior to current year		3,977	2,790
Four years prior to current year		2,662	1,264
Prior		5,619	4,920
Revolving Loans		188	203
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		20,727	18,847
Consumer loans | Performing loans | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		2,996	2,646
One year prior to current year		2,443	2,753
Two years prior to current year		2,653	4,096
Three years prior to current year		3,958	2,761
Four years prior to current year		2,639	1,236
Prior		5,384	4,677
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		20,073	18,169
Consumer loans | Performing loans | Home equity mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		38	80
One year prior to current year		80	69
Two years prior to current year		67	11
Three years prior to current year		9	22
Four years prior to current year		18	25
Prior		175	176
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		387	383
Consumer loans | Performing loans | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		0	0
Revolving Loans		183	196
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		183	196
Consumer loans | Performing loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	8
Two years prior to current year		4	7
Three years prior to current year		10	7
Four years prior to current year		5	3
Prior		60	67
Revolving Loans		5	7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		84	99
Consumer loans | Nonaccrual loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	11
Two years prior to current year		7	11
Three years prior to current year		7	9
Four years prior to current year		10	8
Prior		144	139
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		168	178
Consumer loans | Nonaccrual loans | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	11
Two years prior to current year		7	11
Three years prior to current year		7	9
Four years prior to current year		10	8
Prior		138	133
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		162	172
Consumer loans | Nonaccrual loans | Home equity mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		6	6
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		6	6
Consumer loans | Accruing loans contractually past due 90 days or more
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		2	2
Revolving Loans		2	3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		4	5
Consumer loans | Accruing loans contractually past due 90 days or more | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		0	0
Revolving Loans		2	3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		2	3
Consumer loans | Accruing loans contractually past due 90 days or more | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		2	2
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		$ 2	$ 2
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Loans - Credit Risk Profile of

Loans - Credit Risk Profile of Commercial Loans (Detail) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total	[1]	$ 62,014	$ 58,987
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		3,253	4,656
One year prior to current year		4,307	3,868
Two years prior to current year		3,446	3,250
Three years prior to current year		3,128	1,388
Four years prior to current year		1,040	2,354
Prior		12,451	11,069
Revolving Loans		13,179	13,054
Revolving Loans Converted to Term Loans		311	318
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		41,115	39,957
Commercial loans | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		638	920
One year prior to current year		1,039	1,286
Two years prior to current year		1,217	1,019
Three years prior to current year		883	355
Four years prior to current year		262	1,054
Prior		2,715	2,409
Revolving Loans		38	41
Revolving Loans Converted to Term Loans		3	3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		6,795	7,087
Commercial loans | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		1,409	1,270
One year prior to current year		1,356	1,148
Two years prior to current year		1,118	1,074
Three years prior to current year		1,261	231
Four years prior to current year		176	561
Prior		4,096	4,253
Revolving Loans		6,696	6,922
Revolving Loans Converted to Term Loans		308	265
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		16,420	15,724
Commercial loans | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		935	2,255
One year prior to current year		1,768	1,153
Two years prior to current year		849	844
Three years prior to current year		660	151
Four years prior to current year		116	321
Prior		4,495	3,600
Revolving Loans		1,750	2,351
Revolving Loans Converted to Term Loans		0	50
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		10,573	10,725
Commercial loans | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		271	211
One year prior to current year		144	281
Two years prior to current year		262	313
Three years prior to current year		324	651
Four years prior to current year		486	418
Prior		1,145	807
Revolving Loans		4,695	3,740
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		7,327	6,421
Commercial loans | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		1,710	3,217
One year prior to current year		2,373	1,705
Two years prior to current year		1,264	1,261
Three years prior to current year		1,178	807
Four years prior to current year		705	1,028
Prior		6,994	6,322
Revolving Loans		8,925	8,595
Revolving Loans Converted to Term Loans		89	54
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		23,238	22,989
Commercial loans | Investment grade | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		66	327
One year prior to current year		323	100
Two years prior to current year		26	24
Three years prior to current year		0	187
Four years prior to current year		166	162
Prior		593	939
Revolving Loans		0	1
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		1,174	1,740
Commercial loans | Investment grade | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		662	732
One year prior to current year		507	304
Two years prior to current year		351	543
Three years prior to current year		590	95
Four years prior to current year		86	261
Prior		1,842	1,977
Revolving Loans		3,018	3,311
Revolving Loans Converted to Term Loans		89	54
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		7,145	7,277
Commercial loans | Investment grade | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		811	1,947
One year prior to current year		1,448	1,109
Two years prior to current year		751	651
Three years prior to current year		558	149
Four years prior to current year		96	307
Prior		3,714	2,842
Revolving Loans		1,438	2,140
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		8,816	9,145
Commercial loans | Investment grade | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		171	211
One year prior to current year		95	192
Two years prior to current year		136	43
Three years prior to current year		30	376
Four years prior to current year		357	298
Prior		845	564
Revolving Loans		4,469	3,143
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		6,103	4,827
Commercial loans | Non-investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		1,543	1,439
One year prior to current year		1,934	2,163
Two years prior to current year		2,182	1,989
Three years prior to current year		1,950	581
Four years prior to current year		335	1,326
Prior		5,457	4,747
Revolving Loans		4,254	4,459
Revolving Loans Converted to Term Loans		222	264
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		17,877	16,968
Commercial loans | Non-investment grade | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		572	593
One year prior to current year		716	1,186
Two years prior to current year		1,191	995
Three years prior to current year		883	168
Four years prior to current year		96	892
Prior		2,122	1,470
Revolving Loans		38	40
Revolving Loans Converted to Term Loans		3	3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		5,621	5,347
Commercial loans | Non-investment grade | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		747	538
One year prior to current year		849	844
Two years prior to current year		767	531
Three years prior to current year		671	136
Four years prior to current year		90	300
Prior		2,254	2,276
Revolving Loans		3,678	3,611
Revolving Loans Converted to Term Loans		219	211
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		9,275	8,447
Commercial loans | Non-investment grade | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		124	308
One year prior to current year		320	44
Two years prior to current year		98	193
Three years prior to current year		102	2
Four years prior to current year		20	14
Prior		781	758
Revolving Loans		312	211
Revolving Loans Converted to Term Loans		0	50
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		1,757	1,580
Commercial loans | Non-investment grade | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		100	0
One year prior to current year		49	89
Two years prior to current year		126	270
Three years prior to current year		294	275
Four years prior to current year		129	120
Prior		300	243
Revolving Loans		226	597
Revolving Loans Converted to Term Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		$ 1,224	$ 1,594
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Loans - Disaggregation of Criti

Loans - Disaggregation of Criticized Loans by Year of Origination (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net	[1]	$ 62,014	$ 58,987
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		3,253	4,656
One year prior to current year		4,307	3,868
Two years prior to current year		3,446	3,250
Three years prior to current year		3,128	1,388
Four years prior to current year		1,040	2,354
Prior		12,451	11,069
Revolving Loans		13,179	13,054
Revolving Loans Converted to Term Loans		311	318
Loans, net		41,115	39,957
Commercial loans | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		1,409	1,270
One year prior to current year		1,356	1,148
Two years prior to current year		1,118	1,074
Three years prior to current year		1,261	231
Four years prior to current year		176	561
Prior		4,096	4,253
Revolving Loans		6,696	6,922
Revolving Loans Converted to Term Loans		308	265
Loans, net		16,420	15,724
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		3,034	2,726
One year prior to current year		2,523	2,841
Two years prior to current year		2,731	4,125
Three years prior to current year		3,984	2,799
Four years prior to current year		2,672	1,272
Prior		5,765	5,061
Revolving Loans		190	206
Loans, net		20,899	19,030
Consumer loans | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		2,996	2,646
One year prior to current year		2,443	2,764
Two years prior to current year		2,660	4,107
Three years prior to current year		3,965	2,770
Four years prior to current year		2,649	1,244
Prior		5,522	4,810
Revolving Loans		0	0
Loans, net		20,235	18,341
Consumer loans | Home equity mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		38	80
One year prior to current year		80	69
Two years prior to current year		67	11
Three years prior to current year		9	22
Four years prior to current year		18	25
Prior		181	182
Revolving Loans		0	0
Loans, net		393	389
Consumer loans | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		0	0
Revolving Loans		185	199
Loans, net		$ 185	$ 199
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Loans - Gross Charge-Offs (Deta

Loans - Gross Charge-Offs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 8	$ 36	$ 64	$ 52
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			0	0
One year prior to current year			0	0
Two years prior to current year			0	17
Three years prior to current year			32	0
Four years prior to current year			0	0
Prior			24	9
Revolving loans			1	14
Revolving Loans Converted to Term Loans			0	0
Total			57	40
Commercial loans | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			0	0
One year prior to current year			0	0
Two years prior to current year			0	17
Three years prior to current year			32	0
Four years prior to current year			0	0
Prior			21	9
Revolving loans			1	14
Revolving Loans Converted to Term Loans			0	0
Total	5	34	54	40
Commercial loans | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			0
One year prior to current year			0
Two years prior to current year			0
Three years prior to current year			0
Four years prior to current year			0
Prior			3
Revolving loans			0
Revolving Loans Converted to Term Loans			0
Total	0	0	3	0
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			0	0
One year prior to current year			0	0
Two years prior to current year			0	0
Three years prior to current year			0	0
Four years prior to current year			0	0
Prior			1	6
Revolving loans			6	6
Total			7	12
Consumer loans | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year				0
One year prior to current year				0
Two years prior to current year				0
Three years prior to current year				0
Four years prior to current year				0
Prior				4
Revolving loans				0
Total				4
Consumer loans | Home equity mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year				0
One year prior to current year				0
Two years prior to current year				0
Three years prior to current year				0
Four years prior to current year				0
Prior				1
Revolving loans				0
Total	0	0	0	1
Consumer loans | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			0	0
One year prior to current year			0	0
Two years prior to current year			0	0
Three years prior to current year			0	0
Four years prior to current year			0	0
Prior			0	0
Revolving loans			6	6
Total	2	2	6	6
Consumer loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			0	0
One year prior to current year			0	0
Two years prior to current year			0	0
Three years prior to current year			0	0
Four years prior to current year			0	0
Prior			1	1
Revolving loans			0	0
Total	$ 1	$ 0	$ 1	$ 1

Loans - Delinquency Ratio for C

Loans - Delinquency Ratio for Consumer Loan (Detail) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total	[1]	$ 62,014	$ 58,987
Loans carried at lower of amortized cost or fair value of collateral less cost to sell		69	61
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		3,034	2,726
One year prior to current year		2,523	2,841
Two years prior to current year		2,731	4,125
Three years prior to current year		3,984	2,799
Four years prior to current year		2,672	1,272
Prior		5,765	5,061
Revolving Loans		190	206
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		20,899	19,030
Loans in process of foreclosure		33	21
Consumer loans | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		2,996	2,646
One year prior to current year		2,443	2,764
Two years prior to current year		2,660	4,107
Three years prior to current year		3,965	2,770
Four years prior to current year		2,649	1,244
Prior		5,522	4,810
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		20,235	18,341
Consumer loans | Home equity mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		38	80
One year prior to current year		80	69
Two years prior to current year		67	11
Three years prior to current year		9	22
Four years prior to current year		18	25
Prior		181	182
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		393	389
Consumer loans | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		0	0
Revolving Loans		185	199
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		185	199
Consumer loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	8
Two years prior to current year		4	7
Three years prior to current year		10	7
Four years prior to current year		5	3
Prior		62	69
Revolving Loans		5	7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		86	101
Consumer loans | Summary of Two Months and Over Contractual Delinquency
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		1	2
Two years prior to current year		9	6
Three years prior to current year		4	6
Four years prior to current year		10	1
Prior		111	106
Revolving Loans		4	4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		139	125
Consumer loans | Summary of Two Months and Over Contractual Delinquency | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		1	2
Two years prior to current year		9	6
Three years prior to current year		4	6
Four years prior to current year		9	1
Prior		104	100
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		127	115
Consumer loans | Summary of Two Months and Over Contractual Delinquency | Home equity mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		5	4
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		5	4
Consumer loans | Summary of Two Months and Over Contractual Delinquency | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		0	0
Prior		0	0
Revolving Loans		4	4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		4	4
Consumer loans | Summary of Two Months and Over Contractual Delinquency | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	0
One year prior to current year		0	0
Two years prior to current year		0	0
Three years prior to current year		0	0
Four years prior to current year		1	0
Prior		2	2
Revolving Loans		0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Total		$ 3	$ 2
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Allowance for Credit Losses - N

Allowance for Credit Losses - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) scenario	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) scenario	Sep. 30, 2023 USD ($)	Jun. 30, 2024 scenario
Credit Loss [Abstract]
Number of forward-looking economic scenarios	4		4
Number of updated forward-looking economic scenarios	4		4		4
Charge-off of accrued interest receivables | $	$ 1	$ 6	$ 2	$ 10

Allowance for Credit Losses - F

Allowance for Credit Losses - Forecasted Economic Scenarios (Details)	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Forecast, Quarter ended December 31, 2024
Measurement of ECL Measurements [Line Items]
Unemployment rate (quarterly average) (in percent)	4.30%	4.10%	4.30%
GDP growth rate (year-over-year) (in percent)	1.60%	1.80%	1.10%
Forecast, Quarter ended June 30, 2025
Measurement of ECL Measurements [Line Items]
Unemployment rate (quarterly average) (in percent)	4.40%	4.10%	4.20%
GDP growth rate (year-over-year) (in percent)	1.40%	1.70%	1.80%
Forecast, Quarter ended December 31, 2025
Measurement of ECL Measurements [Line Items]
Unemployment rate (quarterly average) (in percent)	4.30%	4.10%	4.10%
GDP growth rate (year-over-year) (in percent)	2%	1.70%	2.10%

Allowance for Credit Losses - A

Allowance for Credit Losses - Allowance for Credit Losses and Liability for Off-balance Sheet Credit Exposures (Details) - USD ($)	Sep. 30, 2024		Jun. 30, 2024	Dec. 31, 2023		Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Credit Loss [Abstract]
Loans	$ 547,000,000	[1]	$ 583,000,000	$ 591,000,000	[1]	$ 576,000,000	$ 605,000,000	$ 584,000,000
Securities held-to-maturity	0			0
Other financial assets measured at amortized cost	0			0
Securities available-for-sale	0			0
Total allowance for credit losses	547,000,000			591,000,000
Liability for off-balance sheet credit exposures	$ 135,000,000		$ 118,000,000	$ 111,000,000		$ 133,000,000	$ 143,000,000	$ 117,000,000
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Allowance for Credit Losses - S

Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses and Related Loan Balance by Product (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2024		Sep. 30, 2023	Sep. 30, 2024		Sep. 30, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses - beginning of period	$ 583		$ 605	$ 591	[1]	$ 584
Provision charged (credited) to income	(30)		2	12		32
Charge-offs	(8)		(36)	(64)		(52)
Recoveries	2		5	8		12
Net (charge-offs) recoveries	(6)		(31)	(56)		(40)
Allowance for credit losses - end of period	547	[1]	576	547	[1]	576
Commercial loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs				(57)		(40)
Commercial loans | Real estate, including construction
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses - beginning of period	145		146	144		200
Provision charged (credited) to income	17		(3)	18		(57)
Charge-offs	0		0	0		0
Recoveries	0		0	0		0
Net (charge-offs) recoveries	0		0	0		0
Allowance for credit losses - end of period	162		143	162		143
Commercial loans | Business and corporate banking
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses - beginning of period	300		295	302		230
Provision charged (credited) to income	(33)		24	13		93
Charge-offs	(5)		(34)	(54)		(40)
Recoveries	0		3	1		5
Net (charge-offs) recoveries	(5)		(31)	(53)		(35)
Allowance for credit losses - end of period	262		288	262		288
Commercial loans | Global banking
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses - beginning of period	121		151	127		120
Provision charged (credited) to income	(15)		(21)	(18)		10
Charge-offs	0		0	(3)		0
Recoveries	0		0	0		0
Net (charge-offs) recoveries	0		0	(3)		0
Allowance for credit losses - end of period	106		130	106		130
Commercial loans | Other commercial
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses - beginning of period	1		1	1		1
Provision charged (credited) to income	0		0	0		0
Charge-offs	0		0	0		0
Recoveries	0		0	0		0
Net (charge-offs) recoveries	0		0	0		0
Allowance for credit losses - end of period	1		1	1		1
Consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs				(7)		(12)
Consumer loans | Residential Mortgages
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses - beginning of period	(7)		(13)	(9)		11
Provision charged (credited) to income	(2)		2	(2)		(20)
Charge-offs	0		0	0		(4)
Recoveries	1		0	3		2
Net (charge-offs) recoveries	1		0	3		(2)
Allowance for credit losses - end of period	(8)		(11)	(8)		(11)
Consumer loans | Home equity mortgages
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses - beginning of period	7		7	7		2
Provision charged (credited) to income	1		(1)	0		4
Charge-offs	0		0	0		(1)
Recoveries	0		1	1		2
Net (charge-offs) recoveries	0		1	1		1
Allowance for credit losses - end of period	8		7	8		7
Consumer loans | Credit cards
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses - beginning of period	13		15	16		16
Provision charged (credited) to income	1		2	0		3
Charge-offs	(2)		(2)	(6)		(6)
Recoveries	1		1	3		3
Net (charge-offs) recoveries	(1)		(1)	(3)		(3)
Allowance for credit losses - end of period	13		16	13		16
Consumer loans | Other consumer
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses - beginning of period	3		3	3		4
Provision charged (credited) to income	1		(1)	1		(1)
Charge-offs	(1)		0	(1)		(1)
Recoveries	0		0	0		0
Net (charge-offs) recoveries	(1)		0	(1)		(1)
Allowance for credit losses - end of period	$ 3		$ 2	$ 3		$ 2
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Allowance for Credit Losses - C

Allowance for Credit Losses - Change in Liability for Off-balance Sheet Credit Exposures (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 118	$ 143	$ 111	$ 117
Provision charged (credited) to income	17	(10)	24	16
Balance at end of period	$ 135	$ 133	$ 135	$ 133

Allowance for Credit Losses -_2

Allowance for Credit Losses - Accrued Interest Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Credit Loss [Abstract]
Loans	$ 253	$ 259
Securities held-to-maturity	67	57
Other financial assets measured at amortized cost	49	19
Securities available-for-sale	112	87
Total accrued interest receivables	481	422
Allowance for credit losses	0	0
Accrued interest receivables, net	$ 481	$ 422

Loans Held for Sale - Summary (

Loans Held for Sale - Summary (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale	[1]	$ 744	$ 339
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		742	339
Commercial loans | Real estate, including construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		40	0
Commercial loans | Business and corporate banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		12	0
Commercial loans | Global banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		690	339
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		2	0
Consumer loans | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		$ 2	$ 0
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Loans Held for Sale - Narrative

Loans Held for Sale - Narrative (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale	[1]	$ 744			$ 744		$ 339
Revenue (losses) associated with the economic hedging program		214	$ (336)		243	$ 326
Commercial loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans held-for-sale		673			673		250
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		742			742		339
Valuation allowance		0			0		2
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		2			2		0
Valuation allowance		0			0		0
Loans Transferred From Portfolio Loans to Held For Sale | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		69	58	$ 507	69	58	89
Lower of amortized cost or fair value adjustment		0	0		0	0
Residential mortgages | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		2			2		0
Global banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		690			690		$ 339
Other Income (Loss)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue (losses) associated with the economic hedging program		0	$ 0		$ 0	$ 0
Other Income (Loss) | Loans Transferred From Portfolio Loans to Held For Sale | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lower of amortized cost or fair value adjustment		$ (4)		$ 34
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Goodwill (Details)

Goodwill (Details) - USD ($) $ in Millions	Sep. 30, 2024		Dec. 31, 2023		Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 458	[1]	$ 458	[1]	$ 458
Accumulated impairment loss	$ 1,819		$ 1,819
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Derivative Financial Instrume_3

Derivative Financial Instruments - Fair Value of Derivatives and Balance Offsetting (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 12,832	$ 17,169
Derivative Liabilities	13,299	17,263
Gross amounts of receivable subject to enforceable master netting agreements	10,428	14,110
Gross amounts of payable subject to enforceable master netting agreements	10,428	14,110
Less: Gross amounts of cash collateral received subject to enforceable master netting agreements	1,170	1,760
Less: Gross amounts of cash collateral posted subject to enforceable master netting agreements	1,511	1,321
Derivative asset	1,234	1,299
Derivative liability	1,360	1,832
Less: Gross amounts of financial instrument collateral received not offset	151	63
Less: Gross amounts of financial instrument collateral posted not offset	36	273
Net amount of derivative asset	1,083	1,236
Net amount of derivative liability	$ 1,324	$ 1,559
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Interest, taxes and other liabilities (includes nil and $10 million designated under fair value option at September 30, 2024 and December 31, 2023, respectively)	Interest, taxes and other liabilities (includes nil and $10 million designated under fair value option at September 30, 2024 and December 31, 2023, respectively)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, net of allowance for credit losses of nil at both September 30, 2024 and December 31, 2023 (includes nil and $10 million designated under fair value option at September 30, 2024 and December 31, 2023, respectively)	Other assets, net of allowance for credit losses of nil at both September 30, 2024 and December 31, 2023 (includes nil and $10 million designated under fair value option at September 30, 2024 and December 31, 2023, respectively)
Trading Assets
Derivatives, Fair Value [Line Items]
Less: Gross amounts of cash collateral received subject to enforceable master netting agreements	$ 889	$ 1,416
Trading Liabilities
Derivatives, Fair Value [Line Items]
Less: Gross amounts of cash collateral posted subject to enforceable master netting agreements	1,511	1,321
Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	6	0
Designated as Hedging Instrument | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	66	140
Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	905	1,255
Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	692	962
Foreign exchange contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	9,569	13,606
Foreign exchange contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	9,623	13,479
Equity contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	395	420
Equity contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1,148	1,080
Precious metals contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	1,288	1,153
Precious metals contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1,271	1,033
Credit contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	111	95
Credit contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	137	137
Credit contracts | Not Designated as Hedging Instrument, Other | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	11	14
Credit contracts | Not Designated as Hedging Instrument, Other | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	128	123
Bilateral OTC | Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	797	1,178
Bilateral OTC | Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	691	946
Bilateral OTC | Interest rate contracts | Not Designated as Hedging Instrument, Other | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Bilateral OTC | Interest rate contracts | Not Designated as Hedging Instrument, Other | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	62	76
Bilateral OTC | Foreign exchange contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	9,483	13,606
Bilateral OTC | Foreign exchange contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	9,623	13,479
Bilateral OTC | Equity contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	390	413
Bilateral OTC | Equity contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1,148	1,080
Bilateral OTC | Equity contracts | Not Designated as Hedging Instrument, Other | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	536	621
Bilateral OTC | Equity contracts | Not Designated as Hedging Instrument, Other | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	116	193
Bilateral OTC | Precious metals contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	1,288	1,150
Bilateral OTC | Precious metals contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1,271	1,033
Bilateral OTC | Credit contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	111	81
Bilateral OTC | Credit contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	137	137
Bilateral OTC | Credit contracts | Not Designated as Hedging Instrument, Other | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	11	13
Bilateral OTC | Credit contracts | Not Designated as Hedging Instrument, Other | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	128	122
Bilateral OTC | Other Contracts | Not Designated as Hedging Instrument, Other | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	11	5
Bilateral OTC | Other Contracts | Not Designated as Hedging Instrument, Other | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	56	40
Bilateral OTC | Fair Value Hedging | Interest rate contracts | Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	2	0
Bilateral OTC | Fair Value Hedging | Interest rate contracts | Designated as Hedging Instrument | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	2	83
Bilateral OTC | Cash Flow Hedging | Interest rate contracts | Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Bilateral OTC | Cash Flow Hedging | Interest rate contracts | Designated as Hedging Instrument | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	2	1
Bilateral OTC | Cash Flow Hedging | Foreign exchange contracts | Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	4	0
Bilateral OTC | Cash Flow Hedging | Foreign exchange contracts | Designated as Hedging Instrument | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	62	56
OTC Cleared | Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	101	70
OTC Cleared | Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	0
OTC Cleared | Foreign exchange contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	86	0
OTC Cleared | Foreign exchange contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	0
OTC Cleared | Credit contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	14
OTC Cleared | Credit contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	0
OTC Cleared | Credit contracts | Not Designated as Hedging Instrument, Other | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	1
OTC Cleared | Credit contracts | Not Designated as Hedging Instrument, Other | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	1
Exchange Traded | Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	7	7
Exchange Traded | Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1	16
Exchange Traded | Equity contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	5	7
Exchange Traded | Equity contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	0
Exchange Traded | Precious metals contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	3
Exchange Traded | Precious metals contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 0	$ 0

Derivative Financial Instrume_4

Derivative Financial Instruments - Carrying Value of Hedged Items in Fair Value Hedge (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Carrying amount of hedged items	$ 12,958	$ 11,112
Active hedged asset adjustments	(1,024)	(1,320)
Discontinued hedged asset adjustments	(41)	(70)
Total hedged asset adjustments	$ (1,065)	$ (1,390)
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Securities available-for-sale (includes amortized cost of $27.7 billion and $28.0 billion at September 30, 2024 and December 31, 2023, respectively, an allowance for credit losses of nil at both September 30, 2024 and December 31, 2023, and $1.6 billion and $0.2 billion pledged to creditors at September 30, 2024 and December 31, 2023, respectively)	Securities available-for-sale (includes amortized cost of $27.7 billion and $28.0 billion at September 30, 2024 and December 31, 2023, respectively, an allowance for credit losses of nil at both September 30, 2024 and December 31, 2023, and $1.6 billion and $0.2 billion pledged to creditors at September 30, 2024 and December 31, 2023, respectively)
Deposits
Derivatives, Fair Value [Line Items]
Carrying amount of hedged liability items	$ 1,483	$ 1,463
Active hedged liability adjustments	(62)	(104)
Discontinued hedged liability adjustments	44	67
Total hedged liability adjustments	$ (18)	$ (37)
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Deposits	Deposits
Long-term debt
Derivatives, Fair Value [Line Items]
Carrying amount of hedged liability items	$ 8,320	$ 7,913
Active hedged liability adjustments	(221)	(407)
Discontinued hedged liability adjustments	42	72
Total hedged liability adjustments	$ (179)	$ (335)
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Long-term debt (includes $7.1 billion and $7.5 billion designated under fair value option at September 30, 2024 and December 31, 2023, respectively)	Long-term debt (includes $7.1 billion and $7.5 billion designated under fair value option at September 30, 2024 and December 31, 2023, respectively)

Derivative Financial Instrume_5

Derivative Financial Instruments - Gains and Losses on Hedged Items in Fair Value Hedges (Detail) - Net interest income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivatives	$ (251)	$ 637	$ 57	$ 732
Gain (Loss) on Hedged Items	290	(615)	(20)	(634)
Asset-backed securities available-for-sale | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivatives	(405)	735	67	927
Gain (Loss) on Hedged Items	617	(550)	504	(384)
Deposits | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivatives	40	(15)	9	(42)
Gain (Loss) on Hedged Items	(53)	(20)	(92)	(58)
Long-term debt | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivatives	114	(83)	(19)	(153)
Gain (Loss) on Hedged Items	$ (274)	$ (45)	$ (432)	$ (192)

Derivative Financial Instrume_6

Derivative Financial Instruments - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Losses related to discontinued cash flow hedge relationships	$ 22	$ 53	$ 45	$ 153
Cash flow hedge gain (loss) to be reclassified within twelve months			(23)
Aggregate fair value of all derivative instruments with credit-risk related contingent features	110		110		$ 169
Collateral already posted aggregate fair value	$ 54		$ 54		$ 90
OCI, Cash Flow Hedge, Reclassification for Discontinuance, Statement of Income or Comprehensive Income [Extensible Enumeration]			Interest Income (Expense), Operating

Derivative Financial Instrume_7

Derivative Financial Instruments - Gains and Losses on Derivative Instruments Designated and Qualifying As Hedging Instruments in Cash Flow Hedges (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives	$ (164)	$ 27	$ (102)	$ (8)
Gain (Loss) Reclassified From AOCI into Income	(22)	(53)	(45)	(153)
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives	6	0	5	0
Foreign exchange contracts | Net interest income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified From AOCI into Income	0	0	0	0
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives	(170)	27	(107)	(8)
Interest rate contracts | Net interest income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified From AOCI into Income	$ (22)	$ (53)	$ (45)	$ (153)

Derivative Financial Instrume_8

Derivative Financial Instruments - Gains and Losses on Derivative Instruments Held For Trading Purpose (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ (647)	$ 984	$ (1,784)	$ 60
Trading revenue | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	(120)	173	8	118
Trading revenue | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	85	35	226	169
Trading revenue | Equity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	(495)	522	(2,016)	(651)
Trading revenue | Precious metals contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	(2)	84	(13)	233
Trading revenue | Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ (115)	$ 170	$ 11	$ 191

Derivative Financial Instrume_9

Derivative Financial Instruments - Gains and Losses on Derivative Instruments Held For Other Purpose (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ 214	$ (336)	$ 243	$ 326
Gain (loss) on instruments designated at fair value and related derivatives
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	256	(287)	319	408
Gain (loss) on instruments designated at fair value and related derivatives | Interest rate contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	69	(100)	(4)	(110)
Gain (loss) on instruments designated at fair value and related derivatives | Equity contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	186	(188)	321	518
Other income (loss) | Equity contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	4	0	4	0
Other income (loss) | Credit contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	(14)	(17)	(45)	(42)
Other income (loss) | Other Contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ (31)	$ (31)	$ (33)	$ (40)

Derivative Financial Instrum_10

Derivative Financial Instruments - Credit-Risk Related Contingent Features (Detail) $ in Millions	Sep. 30, 2024 USD ($)
One-notch downgrade
Derivative [Line Items]
Amount of additional collateral to be posted upon downgrade	$ 0
Two-notch downgrade
Derivative [Line Items]
Amount of additional collateral to be posted upon downgrade	$ 36

Derivative Financial Instrum_11

Derivative Financial Instruments - Notional Value of Derivative Contracts (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Total	$ 1,371,460	$ 1,301,082
Interest rate contracts
Derivative [Line Items]
Total	130,294	122,702
Futures and forwards
Derivative [Line Items]
Total	28,547	5,143
Swaps
Derivative [Line Items]
Total	99,232	114,947
Options written
Derivative [Line Items]
Total	1,054	1,260
Options purchased
Derivative [Line Items]
Total	1,461	1,352
Foreign exchange contracts
Derivative [Line Items]
Total	1,177,384	1,096,967
Swaps, futures and forwards
Derivative [Line Items]
Total	1,040,911	1,005,683
Options written
Derivative [Line Items]
Total	39,030	30,755
Options purchased
Derivative [Line Items]
Total	39,115	30,898
Spot
Derivative [Line Items]
Total	58,328	29,631
Total commodities, equities and precious metals
Derivative [Line Items]
Total	43,309	63,287
Swaps, futures and forwards
Derivative [Line Items]
Total	32,824	53,110
Options written
Derivative [Line Items]
Total	1,570	1,713
Options purchased
Derivative [Line Items]
Total	8,915	8,464
Credit derivatives
Derivative [Line Items]
Total	19,021	16,710
Other Contracts
Derivative [Line Items]
Total	$ 1,452	$ 1,416

Fair Value Option - Narrative (

Fair Value Option - Narrative (Details) - Commercial loans held for sale - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value option, loans 90 days or more past due	$ 0	$ 0
Fair value option loan in nonaccrual status	$ 0	$ 0

Fair Value Option - Summary of

Fair Value Option - Summary of Fair Value and Unpaid Principal Balance (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures [Line Items]
Client share repurchase asset, Fair Value	$ 0	$ 10
Client shares repurchase liability, Fair Value	0	10
Student loans held for investment
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans, designated under fair value option	12	15
Loans held for investment, Unpaid Principal Balance	14	17
Fair Value Over (Under) Unpaid Principal Balance	(2)	(2)
Commercial loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Commercial loans held for sale, Fair Value	673	250
Commercial loans held for sale, Unpaid Principal Balance	680	256
Fair Value Over (Under) Unpaid Principal Balance	(7)	(6)
Client share repurchase asset
Fair Value, Option, Quantitative Disclosures [Line Items]
Client share repurchase asset, Fair Value		10
Client share repurchase asset, Unpaid Principal Balance		10
Fair Value Over (Under) Unpaid Principal Balance		0
Fixed rate long-term debt
Fair Value, Option, Quantitative Disclosures [Line Items]
Fixed rate long-term debt, Fair Value	785	749
Fixed rate long-term debt, Unpaid Principal Balance	741	741
Fair Value Over (Under) Unpaid Principal Balance	44	8
Fixed rate long-term debt | Structured notes
Fair Value, Option, Quantitative Disclosures [Line Items]
Hybrid instruments, structured notes, Fair Value	6,360	6,790
Hybrid instruments, Unpaid Principal Balance	6,056	6,418
Fair Value Over (Under) Unpaid Principal Balance	304	372
Structured deposits
Fair Value, Option, Quantitative Disclosures [Line Items]
Hybrid instruments, structured deposits, Fair Value	2,594	1,821
Hybrid instruments, Unpaid Principal Balance	2,497	1,816
Fair Value Over (Under) Unpaid Principal Balance	$ 97	5
Client share repurchase liability
Fair Value, Option, Quantitative Disclosures [Line Items]
Client shares repurchase liability, Fair Value		10
Unpaid Principal Balance, Other Liabilities, Fair Value Disclosure		10
Fair Value Over (Under) Unpaid Principal Balance		$ 0

Fair Value Option - Components

Fair Value Option - Components of Gain (Loss) on Instruments at Fair Value and Related Derivatives (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]
Mark-to-market on related derivatives	$ 214	$ (336)	$ 243	$ 326
Gain (loss) on instruments designated at fair value and related derivatives	(3)	(9)	(33)	(29)
Gain (loss) on instruments designated at fair value and related derivatives
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]
Interest rate and other components	(259)	278	(350)	(446)
Credit risk component, total	1	1	0	9
Total mark-to-market on financial instruments designated at fair value	(258)	279	(350)	(437)
Mark-to-market on related derivatives	256	(287)	319	408
Net realized gain (loss) on related long-term debt derivatives	(1)	(1)	(2)	0
Gain (loss) on instruments designated at fair value and related derivatives	(3)	(9)	(33)	(29)
Gain (loss) on instruments designated at fair value and related derivatives | Loans
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]
Interest rate and other components	0	0	0	0
Credit risk component, assets	1	1	0	9
Total mark-to-market on financial instruments designated at fair value	1	1	0	9
Mark-to-market on related derivatives	0	0	0	0
Net realized gain (loss) on related long-term debt derivatives	0	0	0	0
Gain (loss) on instruments designated at fair value and related derivatives	1	1	0	9
Gain (loss) on instruments designated at fair value and related derivatives | Long-term debt
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]
Interest rate and other components	(33)	50	(3)	52
Credit risk component, liabilities	0	0	0	0
Total mark-to-market on financial instruments designated at fair value	(33)	50	(3)	52
Mark-to-market on related derivatives	38	(54)	3	(59)
Net realized gain (loss) on related long-term debt derivatives	(1)	(1)	(2)	0
Gain (loss) on instruments designated at fair value and related derivatives	4	(5)	(2)	(7)
Gain (loss) on instruments designated at fair value and related derivatives | Hybrid Instruments
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]
Interest rate and other components	(226)	228	(347)	(498)
Credit risk component, liabilities	0	0	0	0
Total mark-to-market on financial instruments designated at fair value	(226)	228	(347)	(498)
Mark-to-market on related derivatives	218	(233)	316	467
Net realized gain (loss) on related long-term debt derivatives	0	0	0	0
Gain (loss) on instruments designated at fair value and related derivatives	$ (8)	$ (5)	$ (31)	$ (31)

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, common equity			$ 11,374,000,000
Total other comprehensive income (loss)	$ 446,000,000	$ (295,000,000)	279,000,000	$ (106,000,000)
Balance at end of period, common equity	12,121,000,000	11,285,000,000	12,121,000,000	11,285,000,000
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, common equity	(2,093,000,000)	(2,386,000,000)	(1,926,000,000)	(2,575,000,000)
Total other comprehensive income (loss)	446,000,000	(295,000,000)	279,000,000	(106,000,000)
Balance at end of period, common equity	(1,647,000,000)	(2,681,000,000)	(1,647,000,000)	(2,681,000,000)
Unrealized gains (losses) on investment securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, common equity	(1,924,000,000)	(2,129,000,000)	(1,734,000,000)	(2,270,000,000)
Net unrealized gains (losses) arising during the period, net of tax	438,000,000	(346,000,000)	255,000,000	(203,000,000)
Reclassification adjustment for (gains) losses realized in net income (loss), net of tax	112,000,000	0	104,000,000	(2,000,000)
Amortization of net unrealized (gains) losses on securities transferred from available-for-sale to held-to-maturity realized in net income, net of tax			1,000,000	0
Total other comprehensive income (loss)	550,000,000	(346,000,000)	360,000,000	(205,000,000)
Balance at end of period, common equity	(1,374,000,000)	(2,475,000,000)	(1,374,000,000)	(2,475,000,000)
Tax on net unrealized gains (losses) arising during period	145,000,000	(113,000,000)	85,000,000	(66,000,000)
Tax on reclassification adjustment (less than)	36,000,000	0	34,000,000	(1,000,000)
Tax on amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity realized in net income (loss)			1,000,000	0
Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, common equity	20,000,000	85,000,000	61,000,000	86,000,000
Net unrealized gains (losses) arising during the period, net of tax	4,000,000	(8,000,000)	(37,000,000)	(9,000,000)
Total other comprehensive income (loss)	4,000,000	(8,000,000)	(37,000,000)	(9,000,000)
Balance at end of period, common equity	24,000,000	77,000,000	24,000,000	77,000,000
Tax on net unrealized gains (losses) arising during period	1,000,000	(2,000,000)	(12,000,000)	(3,000,000)
Unrealized gains (losses) on derivatives designated as cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, common equity	(196,000,000)	(347,000,000)	(260,000,000)	(396,000,000)
Net unrealized gains (losses) arising during the period, net of tax	(124,000,000)	20,000,000	(77,000,000)	(7,000,000)
Reclassification adjustment for (gains) losses realized in net income (loss), net of tax	17,000,000	40,000,000	34,000,000	116,000,000
Total other comprehensive income (loss)	(107,000,000)	60,000,000	(43,000,000)	109,000,000
Balance at end of period, common equity	(303,000,000)	(287,000,000)	(303,000,000)	(287,000,000)
Tax on net unrealized gains (losses) arising during period	(40,000,000)	7,000,000	(25,000,000)	(1,000,000)
Tax on reclassification adjustment (less than)	5,000,000	13,000,000	11,000,000	37,000,000
Pension and postretirement benefit liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, common equity	7,000,000	5,000,000	7,000,000	5,000,000
Net unrealized gains (losses) arising during the period, net of tax	(1,000,000)	(1,000,000)	(1,000,000)	(1,000,000)
Total other comprehensive income (loss)	(1,000,000)	(1,000,000)	(1,000,000)	(1,000,000)
Balance at end of period, common equity	6,000,000	4,000,000	6,000,000	4,000,000
Tax on net unrealized gains (losses) arising during period	$ (1,000,000)	$ (1,000,000)	$ (1,000,000)	$ (1,000,000)

Fee Income from Contracts wit_3

Fee Income from Contracts with Customers - Disaggregation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Other non-fee revenue	$ 26	$ 213	$ 475	$ 570
Total other revenues	334	517	1,410	1,418
Total Fee Income
Disaggregation of Revenue [Line Items]
Total fee income from contracts with customers	308	304	935	848
Credit card fees, net
Disaggregation of Revenue [Line Items]
Total fee income from contracts with customers	14	13	42	36
Trust and investment management fees
Disaggregation of Revenue [Line Items]
Total fee income from contracts with customers	37	33	107	96
Account services
Disaggregation of Revenue [Line Items]
Total fee income from contracts with customers	80	70	231	209
Credit facilities
Disaggregation of Revenue [Line Items]
Total fee income from contracts with customers	69	89	243	238
Other fees
Disaggregation of Revenue [Line Items]
Total fee income from contracts with customers	8	11	29	28
Other fees and commissions
Disaggregation of Revenue [Line Items]
Total fee income from contracts with customers	157	170	503	475
Servicing and other fees from HSBC affiliates
Disaggregation of Revenue [Line Items]
Total fee income from contracts with customers	99	87	280	238
Insurance
Disaggregation of Revenue [Line Items]
Total fee income from contracts with customers	$ 1	$ 1	$ 3	$ 3

Fee Income from Contracts wit_4

Fee Income from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Deferred fee income	$ 3		$ 3		$ 3
Credit card fees, net
Disaggregation of Revenue [Line Items]
Interchange fees	27	$ 25	81	$ 78
Rewards program costs	$ 16	$ 16	$ 48	$ 49

Related Party Transactions - Su

Related Party Transactions - Summary of Related Party Transactions (Details) - USD ($) $ in Millions		Sep. 30, 2024		Dec. 31, 2023		Sep. 30, 2023
Assets:
Cash and due from banks	[1]	$ 725		$ 704
Interest bearing deposits with banks	[1]	28,334		25,015
Securities purchased under agreements to resell	[1]	4,310		13,878
Trading assets	[1]	21,707		22,115
Loans, net		61,467	[1]	58,396	[1]	$ 57,016
Other	[1]	6,804		6,490
Total assets		167,799	[1]	168,238	[1]	164,357
Liabilities:
Deposits		123,373	[1]	121,283	[1]	$ 119,928
Trading liabilities	[1]	2,837		3,485
Short-term borrowings	[1]	7,653		9,914
Long-term debt	[1]	18,410		18,661
Other	[1]	3,140		3,256
Total liabilities	[1]	155,413		156,599
Related Party
Assets:
Cash and due from banks		205		133
Interest bearing deposits with banks		37		90
Securities purchased under agreements to resell		769		406
Trading assets		84		57
Loans, net		3,784		2,618
Other		459		491
Total assets		5,338		3,795
Liabilities:
Deposits		10,167		9,110
Trading liabilities		283		321
Short-term borrowings		1,342		1,014
Long-term debt		6,747		6,511
Other		272		331
Total liabilities		$ 18,811		$ 17,287
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Related Party Transactions - _2

Related Party Transactions - Summary of Related Party Transactions (Income - Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income (Expense):
Interest income	$ 1,946	$ 1,792	$ 5,756	$ 5,119
Net interest income	439	372	1,277	1,289
Trading revenue (expense)	208	277	717	730
Servicing and other fees from HSBC affiliates:
Gain (loss) on instruments designated at fair value and related derivatives	(3)	(9)	(33)	(29)
Support services from HSBC affiliates:
Total support services from HSBC affiliates	(428)	(426)	(1,246)	(1,235)
Related Party
Income (Expense):
Interest income	66	56	181	170
Interest expense	(140)	(132)	(423)	(375)
Net interest income	(74)	(76)	(242)	(205)
Trading revenue (expense)	(2,194)	1,043	(5,275)	(372)
Servicing and other fees from HSBC affiliates:
Gain (loss) on instruments designated at fair value and related derivatives	218	(233)	316	467
Support services from HSBC affiliates:
Total support services from HSBC affiliates	(428)	(426)	(1,246)	(1,235)
Rental income from HSBC affiliates, net	11	8	39	24
Stock based compensation expense	(7)	(4)	(22)	(14)
HSBC Markets (USA) Inc. ("HMUS")
Support services from HSBC affiliates:
Total support services from HSBC affiliates	(66)	(59)	(183)	(167)
Other HSBC affiliates
Support services from HSBC affiliates:
Total support services from HSBC affiliates	(124)	(126)	(356)	(362)
HSBC Technology & Services (USA) Inc. ("HTSU")
Support services from HSBC affiliates:
Total support services from HSBC affiliates	(238)	(241)	(707)	(706)
Servicing and other fees from HSBC affiliates
Servicing and other fees from HSBC affiliates:
Other revenues	99	87	280	238
Servicing and other fees from HSBC affiliates | Related Party
Servicing and other fees from HSBC affiliates:
Other revenues	99	87	280	238
Servicing and other fees from HSBC affiliates | HSBC Bank plc
Servicing and other fees from HSBC affiliates:
Other revenues	50	47	147	125
Servicing and other fees from HSBC affiliates | HSBC Markets (USA) Inc. ("HMUS")
Servicing and other fees from HSBC affiliates:
Other revenues	24	21	74	61
Servicing and other fees from HSBC affiliates | Other HSBC affiliates
Servicing and other fees from HSBC affiliates:
Other revenues	$ 25	$ 19	$ 59	$ 52

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) - USD ($)		Sep. 30, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Long-term debt	[1]	$ 18,410,000,000	$ 18,661,000,000
Loans receivable from related parties	[1]	62,014,000,000	58,987,000,000
Notional value of derivative contracts		1,371,460,000,000	1,301,082,000,000
Preferred stock issued		265,000,000	265,000,000
HNAH
Related Party Transaction [Line Items]
Long-term debt		6,700,000,000	6,500,000,000
Maximum borrowing capacity		4,000,000,000
Amount outstanding under the loan agreement		0	0
Preferred stock issued		265,000,000	265,000,000
Preferred stock outstanding		265,000,000	265,000,000
HNAH | Loans And Lines Of Credit
Related Party Transaction [Line Items]
Loans receivable from related parties		1,600,000,000	1,300,000,000
HNAH | Loans And Lines Of Credit Maturing In The Fourth Quarter Of 2024
Related Party Transaction [Line Items]
Loans receivable from related parties		1,000,000,000
HNAH | Loans And Lines Of Credit Maturing In The Second Quarter Of 2025
Related Party Transaction [Line Items]
Loans receivable from related parties		600,000,000
HMUS | Loans And Lines Of Credit
Related Party Transaction [Line Items]
Extended loans and lines of credit		14,300,000,000	13,300,000,000
Loans receivable from related parties		2,183,000,000	1,318,000,000
Other HSBC affiliates | Loans And Lines Of Credit
Related Party Transaction [Line Items]
Extended loans and lines of credit		3,500,000,000
Loans receivable from related parties		0	0
Other HSBC affiliates | Short Term Lending
Related Party Transaction [Line Items]
Loans receivable from related parties		1,000,000	0
Related Party
Related Party Transaction [Line Items]
Long-term debt		6,747,000,000	6,511,000,000
Loans receivable from related parties		3,784,000,000	2,618,000,000
Notional value of derivative contracts		787,400,000,000	719,600,000,000
Fair value of derivative assets and liabilities		122,000,000	$ 29,000,000
Fixed Rate Note Maturing June 2025 | HNAH | Senior debt:
Related Party Transaction [Line Items]
Long-term debt		2,000,000,000
Fixed Rate Note Maturing September 2025 | HNAH | Senior debt:
Related Party Transaction [Line Items]
Long-term debt		2,000,000,000
Fixed Rate Note Maturing December 2027 | HNAH | Senior debt:
Related Party Transaction [Line Items]
Long-term debt		500,000,000
Fixed Rate Note Maturing December 2028 | HNAH | Senior debt:
Related Party Transaction [Line Items]
Long-term debt		500,000,000
Fixed Rate Note Maturing June 2030 | HNAH | Senior debt:
Related Party Transaction [Line Items]
Long-term debt		1,500,000,000
Fixed Rate Note Maturing September 2029 | HNAH | Senior debt:
Related Party Transaction [Line Items]
Long-term debt		$ 200,000,000
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Related Party Transactions - _3

Related Party Transactions - Summary of Loans (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Loans, net	[1]	$ 62,014	$ 58,987
HMUS and subsidiaries | Loans And Lines Of Credit
Related Party Transaction [Line Items]
Loans, net		2,183	1,318
HSBC North America | Loans And Lines Of Credit
Related Party Transaction [Line Items]
Loans, net		1,600	1,300
Other short-term affiliate lending | Loans And Lines Of Credit
Related Party Transaction [Line Items]
Loans, net		0	0
Other short-term affiliate lending | Short Term Lending
Related Party Transaction [Line Items]
Loans, net		1	0
Related Party
Related Party Transaction [Line Items]
Loans, net		$ 3,784	$ 2,618
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Business Segments - Narrative (

Business Segments - Narrative (Details)	9 Months Ended
	Sep. 30, 2024 segment
Segment Reporting [Abstract]
Number of operating segments	3

Business Segments - Summary on

Business Segments - Summary on Reconciliation of Results Under IFRS to US GAAP (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2024		Sep. 30, 2023	Sep. 30, 2024		Sep. 30, 2023	Dec. 31, 2023	[1]
Operating Statistics [Line Items]
Net interest income (expense)	$ 439		$ 372	$ 1,277		$ 1,289
Other operating income (expense)	334		517	1,410		1,418
Total operating income (expense)	773		889	2,687		2,707
Provision for credit losses	(13)		(8)	36		48
Total income	786		897	2,651		2,659
Operating expenses	671		658	2,040		1,934
Income before income tax	115		239	611		725
Total assets	167,799	[1]	164,357	167,799	[1]	164,357	$ 168,238
Total loans, net	61,467	[1]	57,016	61,467	[1]	57,016	58,396
Goodwill	458	[1]	458	458	[1]	458	458
Total deposits	123,373	[1]	119,928	123,373	[1]	119,928	$ 121,283
Operating Segments
Operating Statistics [Line Items]
Net interest income (expense)	451		432	1,328		1,477
Other operating income (expense)	313		446	1,324		1,236
Total operating income	764		878	2,652		2,713
Expected credit losses / provision for credit losses	19		(15)	52		47
Total income	745		893	2,600		2,666
Operating expenses	654		636	1,997		1,687
Profit (loss) before income tax	91		257	603		979
Total assets	181,011		186,442	181,011		186,442
Total loans, net	59,851		55,804	59,851		55,804
Goodwill	358		358	358		358
Total deposits	115,774		115,504	115,774		115,504
Group Reporting Basis Adjustments
Operating Statistics [Line Items]
Net interest income (expense)	9		1	22		4
Other operating income (expense)	(7)		(8)	(13)		(57)
Total operating income	2		(7)	9		(53)
Expected credit losses / provision for credit losses	(32)		7	(16)		1
Total income	34		(14)	25		(54)
Operating expenses	10		4	17		200
Profit (loss) before income tax	24		(18)	8		(254)
Total assets	(13,212)		(22,085)	(13,212)		(22,085)
Total loans, net	(1,054)		(313)	(1,054)		(313)
Goodwill	100		100	100		100
Total deposits	(1,192)		(3,853)	(1,192)		(3,853)
Group Reporting Basis Reclassifications
Operating Statistics [Line Items]
Net interest income (expense)	(21)		(61)	(73)		(192)
Other operating income (expense)	28		79	99		239
Total operating income	7		18	26		47
Expected credit losses / provision for credit losses	0		0	0		0
Total income	7		18	26		47
Operating expenses	7		18	26		47
Profit (loss) before income tax	0		0	0		0
Total assets	0		0	0		0
Total loans, net	2,670		1,525	2,670		1,525
Goodwill	0		0	0		0
Total deposits	8,791		8,277	8,791		8,277
WPB | Operating Segments
Operating Statistics [Line Items]
Net interest income (expense)	175		175	529		582
Other operating income (expense)	8		28	133		132
Total operating income	183		203	662		714
Expected credit losses / provision for credit losses	2		(5)	0		(3)
Total income	181		208	662		717
Operating expenses	207		194	592		420
Profit (loss) before income tax	(26)		14	70		297
Total assets	38,385		42,719	38,385		42,719
Total loans, net	25,785		23,178	25,785		23,178
Goodwill	0		0	0		0
Total deposits	28,903		29,253	28,903		29,253
CMB | Operating Segments
Operating Statistics [Line Items]
Net interest income (expense)	305		285	884		858
Other operating income (expense)	29		74	189		225
Total operating income	334		359	1,073		1,083
Expected credit losses / provision for credit losses	21		8	56		38
Total income	313		351	1,017		1,045
Operating expenses	187		175	555		484
Profit (loss) before income tax	126		176	462		561
Total assets	54,909		52,215	54,909		52,215
Total loans, net	24,045		23,119	24,045		23,119
Goodwill	358		358	358		358
Total deposits	43,333		44,948	43,333		44,948
GB | Operating Segments
Operating Statistics [Line Items]
Net interest income (expense)	136		111	369		373
Other operating income (expense)	78		92	266		238
Total operating income	214		203	635		611
Expected credit losses / provision for credit losses	(4)		(18)	(4)		12
Total income	218		221	639		599
Operating expenses	133		144	398		420
Profit (loss) before income tax	85		77	241		179
Total assets	10,122		9,554	10,122		9,554
Total loans, net	9,828		9,009	9,828		9,009
Goodwill	0		0	0		0
Total deposits	40,881		38,810	40,881		38,810
MSS | Operating Segments
Operating Statistics [Line Items]
Net interest income (expense)	13		4	30		32
Other operating income (expense)	72		115	231		261
Total operating income	85		119	261		293
Expected credit losses / provision for credit losses	0		0	0		0
Total income	85		119	261		293
Operating expenses	78		68	238		208
Profit (loss) before income tax	7		51	23		85
Total assets	35,264		42,663	35,264		42,663
Total loans, net	117		104	117		104
Goodwill	0		0	0		0
Total deposits	1,393		825	1,393		825
GBM Other | Operating Segments
Operating Statistics [Line Items]
Net interest income (expense)	(3)		(9)	18		(21)
Other operating income (expense)	(48)		17	(2)		63
Total operating income	(51)		8	16		42
Expected credit losses / provision for credit losses	0		0	0		0
Total income	(51)		8	16		42
Operating expenses	25		19	72		51
Profit (loss) before income tax	(76)		(11)	(56)		(9)
Total assets	38,053		36,303	38,053		36,303
Total loans, net	76		394	76		394
Goodwill	0		0	0		0
Total deposits	1,264		1,668	1,264		1,668
CC | Operating Segments
Operating Statistics [Line Items]
Net interest income (expense)	(175)		(134)	(502)		(347)
Other operating income (expense)	174		120	507		317
Total operating income	(1)		(14)	5		(30)
Expected credit losses / provision for credit losses	0		0	0		0
Total income	(1)		(14)	5		(30)
Operating expenses	24		36	142		104
Profit (loss) before income tax	(25)		(50)	(137)		(134)
Total assets	4,278		2,988	4,278		2,988
Total loans, net	0		0	0		0
Goodwill	0		0	0		0
Total deposits	$ 0		$ 0	$ 0		$ 0
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Retained Earnings and Regulat_3

Retained Earnings and Regulatory Capital Requirements - Capital Amounts and Ratios in Accordance With Current Banking Regulations (Details) $ in Millions	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
HSBC USA
Common equity Tier 1 ratio:
Capital Amount	$ 13,279	$ 12,822
Well-Capitalized Ratio	0.045	0.045
Actual Ratio	0.130	0.130
Tier 1 capital ratio:
Capital Amount	$ 13,544	$ 13,087
Well-Capitalized Ratio	0.060	0.060
Actual Ratio	0.133	0.133
Total capital ratio:
Capital Amount	$ 15,889	$ 15,452
Well-Capitalized Ratio	0.100	0.100
Actual Ratio	0.155	0.157
Tier 1 leverage ratio:
Capital Amount	$ 13,544	$ 13,087
Well-Capitalized Ratio	0.040	0.040
Actual Ratio	0.082	0.077
Risk weighted assets:
Capital Amount	$ 102,195	$ 98,450
Adjusted quarterly average assets
Capital Amount	166,088	170,527
HSBC Bank USA
Common equity Tier 1 ratio:
Capital Amount	$ 15,527	$ 15,407
Well-Capitalized Ratio	0.065	0.065
Actual Ratio	0.159	0.161
Tier 1 capital ratio:
Capital Amount	$ 17,027	$ 16,907
Well-Capitalized Ratio	0.080	0.080
Actual Ratio	0.175	0.177
Total capital ratio:
Capital Amount	$ 19,077	$ 19,024
Well-Capitalized Ratio	0.100	0.100
Actual Ratio	0.196	0.199
Tier 1 leverage ratio:
Capital Amount	$ 17,027	$ 16,907
Well-Capitalized Ratio	0.050	0.050
Actual Ratio	0.105	0.102
Risk weighted assets:
Capital Amount	$ 97,500	$ 95,455
Adjusted quarterly average assets
Capital Amount	$ 161,401	$ 166,526

Retained Earnings and Regulat_4

Retained Earnings and Regulatory Capital Requirements - Narrative (Details) $ in Millions	3 Months Ended
	Sep. 30, 2024 USD ($)
HSBC Bank USA
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Proceeds from common stock dividend received	$ 600

Variable Interest Entities - Su

Variable Interest Entities - Summary of Assets and Liabilities Related to Consolidated Variable Interest Entities (Details) - USD ($) $ in Millions		Sep. 30, 2024		Dec. 31, 2023		Sep. 30, 2023
Variable Interest Entity [Line Items]
Other assets	[1]	$ 6,804		$ 6,490
Interest, taxes and other liabilities	[1]	3,140		3,256
Consolidated Assets		167,799	[1]	168,238	[1]	$ 164,357
Consolidated Liabilities	[1]	155,413		156,599
Variable interest entities
Variable Interest Entity [Line Items]
Other assets		13		23
Interest, taxes and other liabilities		21		17
Consolidated Assets		13		23
Consolidated Liabilities		21		17
Low income housing limited liability partnership: | Variable interest entities
Variable Interest Entity [Line Items]
Other assets		13		23
Interest, taxes and other liabilities		$ 21		$ 17
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Variable Interest Entities - Va

Variable Interest Entities - Variable Interests Held by Us and Our Maximum Exposure to Loss Rising From Our Involvements in Those VIEs (Details) - USD ($) $ in Millions		Sep. 30, 2024		Dec. 31, 2023		Sep. 30, 2023
Variable Interest Entity [Line Items]
Consolidated Assets		$ 167,799	[1]	$ 168,238	[1]	$ 164,357
Consolidated Liabilities	[1]	155,413		156,599
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets Held by Unconsolidated VIEs		7,626		7,825
Consolidated Assets		1,662		1,731
Consolidated Liabilities		387		327
Maximum Exposure to Loss		1,669		1,731
Limited partnership investments
Variable Interest Entity [Line Items]
Total Assets Held by Unconsolidated VIEs		6,519		6,718
Consolidated Assets		895		793
Consolidated Liabilities		387		327
Maximum Exposure to Loss		895		793
Asset-backed financing SPEs
Variable Interest Entity [Line Items]
Total Assets Held by Unconsolidated VIEs		1,107		1,107
Consolidated Assets		767		938
Consolidated Liabilities		0		0
Maximum Exposure to Loss		$ 774		$ 938
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Guarantee Arrangements, Pledg_3

Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Carrying Value and Contractual Amounts of our Sell Protection Credit Derivatives and Major Off-Balance Sheet Guarantee Arrangements (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Guarantor Obligations [Line Items]
Total, Carrying Value	$ 143	$ 54
Credit derivatives, Notional/Maximum Exposure to Loss	7,737	10,726
Total, Notional/Maximum Exposure to Loss	14,291	12,097
Sell-protection Credit Derivatives
Guarantor Obligations [Line Items]
Credit derivatives, Carrying Value	143	54
Credit derivatives, Notional/Maximum Exposure to Loss	5,642	2,992
Financial standby letters of credit, net of participations
Guarantor Obligations [Line Items]
Standby letters of credit, Carrying Value	0	0
Standby letters of credit, Notional/Maximum Exposure to Loss	5,469	5,785
Performance standby letters of credit, net of participations
Guarantor Obligations [Line Items]
Standby letters of credit, Carrying Value	0	0
Standby letters of credit, Notional/Maximum Exposure to Loss	3,180	3,320
Affiliated Entity | Sell-protection Credit Derivatives
Guarantor Obligations [Line Items]
Credit derivatives, Notional/Maximum Exposure to Loss	2,557	1,483
Affiliated Entity | Financial and performance standby letters of credit
Guarantor Obligations [Line Items]
Standby letters of credit, Notional/Maximum Exposure to Loss	$ 1,740	$ 2,080

Guarantee Arrangements, Pledg_4

Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Net Credit Derivative Positions (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Credit Derivatives [Line Items]
Net position, Carrying/Fair Value	$ (135)	$ (142)
Notional	7,737	10,726
Sell-protection credit derivative positions
Credit Derivatives [Line Items]
Carrying / Fair Value	143	54
Notional	5,642	2,992
Buy-protection credit derivative positions
Credit Derivatives [Line Items]
Carrying / Fair Value	(278)	(196)
Notional	$ 13,379	$ 13,718

Guarantee Arrangements, Pledg_5

Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Narrative (Detail) - USD ($)		3 Months Ended			9 Months Ended		36 Months Ended
		Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2007	Dec. 31, 2023
Guarantor Obligations [Line Items]
Deferred fees		$ 3,000,000			$ 3,000,000			$ 3,000,000
Carrying value of swap		1,371,460,000,000			1,371,460,000,000			1,301,082,000,000
Increase to right-of-use asset with corresponding increase to operating lease liability			$ 53,000,000
Estimate of reasonably possible loss		100,000,000			100,000,000
Fair Value	[1]	25,942,000,000			25,942,000,000			25,696,000,000
Trading assets	[1]	21,707,000,000			21,707,000,000			22,115,000,000
Collateral accepted under security resale agreements, fair value		8,919,000,000			8,919,000,000			19,278,000,000
Collateral accepted under security repurchase agreements but not reported on the balance sheet that can be sold or repledged, fair value		8,269,000,000			8,269,000,000			19,278,000,000
Collateral accepted under security repurchase agreements that has been sold or repledged under repurchase agreements or to cover short sales		781,000,000			781,000,000			2,696,000,000
Visa Class B Shares
Guarantor Obligations [Line Items]
Loss on Visa shares		29,000,000		$ 34,000,000	32,000,000	$ 40,000,000
Asset Pledged as Collateral with Right
Guarantor Obligations [Line Items]
Fair Value		1,567,000,000			1,567,000,000			161,000,000
Trading assets		3,417,000,000			3,417,000,000			3,046,000,000
Obligation to Repurchase Receivables Sold
Guarantor Obligations [Line Items]
Estimated repurchase liability		4,000,000			4,000,000			23,000,000
Obligation to Repurchase Receivables Sold | Minimum
Guarantor Obligations [Line Items]
Estimate of reasonably possible loss		0			0
Obligation to Repurchase Receivables Sold | Maximum
Guarantor Obligations [Line Items]
Estimate of reasonably possible loss		25,000,000			25,000,000
HSBC Securities
Guarantor Obligations [Line Items]
Whole loan securitization							$ 24,000,000,000
HSBC Securities | Mortgage Securitization Activity Related Litigation
Guarantor Obligations [Line Items]
Mortgage securitization outstanding loan purchase and sold		2,300,000,000			2,300,000,000			2,400,000,000
Other liabilities
Guarantor Obligations [Line Items]
Allowance for credit losses on unfunded standby letters of credit		11,000,000			11,000,000			17,000,000
Other liabilities | Standby Letters of Credit
Guarantor Obligations [Line Items]
Deferred fees		52,000,000			52,000,000			49,000,000
Swap
Guarantor Obligations [Line Items]
Carrying value of swap		$ 56,000,000			$ 56,000,000			$ 40,000,000
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Guarantee Arrangements, Pledg_6

Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Summary of Credit Ratings of Credit Risk Related Guarantees (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Credit Derivatives [Line Items]
Credit derivatives, Notional/Maximum Exposure to Loss	$ 7,737	$ 10,726
Total, Notional/Maximum Exposure to Loss	14,291	12,097
Sell-protection Credit Derivatives
Credit Derivatives [Line Items]
Credit derivatives, Notional/Maximum Exposure to Loss	$ 5,642	$ 2,992
Single name credit default swaps | Sell-protection Credit Derivatives
Credit Derivatives [Line Items]
Average Life (in years)	1 year 2 months 12 days
Credit derivatives, Notional/Maximum Exposure to Loss	$ 1,394
Index credit derivatives | Sell-protection Credit Derivatives
Credit Derivatives [Line Items]
Average Life (in years)	4 years 4 months 24 days
Credit derivatives, Notional/Maximum Exposure to Loss	$ 4,248
Standby Letters of Credit
Credit Derivatives [Line Items]
Average Life (in years)	9 months 18 days
Standby letters of credit, Notional/Maximum Exposure to Loss	$ 8,649
Investment Grade
Credit Derivatives [Line Items]
Total, Notional/Maximum Exposure to Loss	10,715
Investment Grade | Sell-protection Credit Derivatives
Credit Derivatives [Line Items]
Credit derivatives, Notional/Maximum Exposure to Loss	4,281
Investment Grade | Single name credit default swaps | Sell-protection Credit Derivatives
Credit Derivatives [Line Items]
Credit derivatives, Notional/Maximum Exposure to Loss	1,021
Investment Grade | Index credit derivatives | Sell-protection Credit Derivatives
Credit Derivatives [Line Items]
Credit derivatives, Notional/Maximum Exposure to Loss	3,260
Investment Grade | Standby Letters of Credit
Credit Derivatives [Line Items]
Standby letters of credit, Notional/Maximum Exposure to Loss	6,434
Non-Investment Grade
Credit Derivatives [Line Items]
Total, Notional/Maximum Exposure to Loss	3,576
Non-Investment Grade | Sell-protection Credit Derivatives
Credit Derivatives [Line Items]
Credit derivatives, Notional/Maximum Exposure to Loss	1,361
Non-Investment Grade | Single name credit default swaps | Sell-protection Credit Derivatives
Credit Derivatives [Line Items]
Credit derivatives, Notional/Maximum Exposure to Loss	373
Non-Investment Grade | Index credit derivatives | Sell-protection Credit Derivatives
Credit Derivatives [Line Items]
Credit derivatives, Notional/Maximum Exposure to Loss	988
Non-Investment Grade | Standby Letters of Credit
Credit Derivatives [Line Items]
Standby letters of credit, Notional/Maximum Exposure to Loss	$ 2,215

Guarantee Arrangements, Pledg_7

Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Summary of Pledged Assets Included in Consolidated Balance Sheet (Detail) - USD ($) $ in Millions		Sep. 30, 2024		Dec. 31, 2023		Sep. 30, 2023
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest bearing deposits with banks	[1]	$ 28,334		$ 25,015
Trading assets	[1]	21,707		22,115
Securities available-for-sale	[1]	25,942		25,696
Securities held-to-maturity	[1]	17,238		15,076
Loans, net	[1]	62,014		58,987
Other assets	[1]	6,804		6,490
Total assets		167,799	[1]	168,238	[1]	$ 164,357
Asset Pledged as Collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest bearing deposits with banks		1,072		998
Trading assets		3,417		3,046
Securities available-for-sale		14,554		9,773
Securities held-to-maturity		9,991		5,387
Loans, net		23,805		18,810
Other assets		849		934
Total assets		$ 53,688		$ 38,948
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Guarantee Arrangements and Pled

Guarantee Arrangements and Pledged Assets and Repurchase Agreements - Offsetting of Resale and Repurchase Agreements and Securities Borrowing and Lending Agreements (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Securities purchased under agreements to resell, Gross Amounts Recognized	$ 8,788	$ 19,382
Securities purchased under agreements to resell, Gross Amounts Offset in the Balance Sheet	4,478	5,504
Securities purchased under agreements to resell, Net amounts Presented in the Balance Sheet	4,310	13,878
Securities purchased under agreements to resell, Gross Amounts Not Offset in the Balance Sheet, Financial Instruments	4,305	13,677
Securities purchased under agreements to resell, Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Receive / Pledged	0	7
Securities purchased under agreements to resell, Net amount	5	194
Securities sold under repurchase agreements, Gross Amounts Recognized	5,697	5,771
Securities sold under repurchase agreements, Gross Amounts Offset in the Balance Sheet	4,478	5,504
Securities sold under repurchase agreements, Net Amounts Presented in the Balance Sheet	1,219	267
Securities sold under repurchase agreements, Gross Amounts Not Offset in the Balance sheet, Financial Instruments	1,212	266
Securities sold under repurchase agreements, Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Received / Pledged	0	0
Securities sold under repurchase agreements, Net amount	$ 7	$ 1

Guarantee Arrangements, Pledg_8

Guarantee Arrangements, Pledged Assets and Repurchase Agreements, Collateral Pledged and Remaining Contractual Maturity of Repurchase Agreements Accounted for as Secured Borrowings (Details) - U.S. Treasury, U.S. Government sponsored and U.S. Government agency securities - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings	$ 5,697	$ 5,771
Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings	3,531	3,107
Up to 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings	594	288
31 to 90 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings	944	918
91 Days to One Year
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings	628	1,458
Greater Than One Year
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings	$ 0	$ 0

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Netting, Assets		$ (10,428)	$ (14,110)
Fair Value	[1]	25,942	25,696
Netting Liabilities		(10,428)	(14,110)
Trading assets	[1]	21,707	22,115
Trading liabilities	[1]	2,837	3,485
Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		3,970	2,469
Trading assets		759	4,019
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets		14,344	11,702
Precious metals trading
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets		160	346
Trading liabilities		238	301
Home equity
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		10	12
Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		92	92
Derivatives liability
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading liabilities		1,071	1,496
Derivative assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets		1,177	1,276
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		60,256	64,268
Netting, Assets		(11,598)	(15,870)
Net Balance, Assets		48,658	48,398
Gross Balance, Liabilities		24,804	28,622
Netting Liabilities		(11,939)	(15,431)
Net Balance, Liabilities		12,865	13,191
Fair Value, Recurring | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		21,870	23,123
Fair Value, Recurring | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		3,970	2,469
Fair Value, Recurring | Home equity
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		10	12
Fair Value, Recurring | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		92	92
Fair Value, Recurring | Domestic Deposits | Domestic deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		2,594	1,821
Net Balance, Liabilities		2,594	1,821
Fair Value, Recurring | Trading liabilities, excluding derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,766	1,989
Net Balance, Liabilities		1,766	1,989
Fair Value, Recurring | Derivatives liability
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		13,299	17,263
Netting Liabilities		(11,939)	(15,431)
Net Balance, Liabilities		1,360	1,832
Fair Value, Recurring | Derivatives liability | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		758	1,122
Netting Liabilities		0	0
Net Balance, Liabilities		758	1,122
Fair Value, Recurring | Derivatives liability | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		9,685	13,535
Netting Liabilities		0	0
Net Balance, Liabilities		9,685	13,535
Fair Value, Recurring | Derivatives liability | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,264	1,273
Netting Liabilities		0	0
Net Balance, Liabilities		1,264	1,273
Fair Value, Recurring | Derivatives liability | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,271	1,033
Netting Liabilities		0	0
Net Balance, Liabilities		1,271	1,033
Fair Value, Recurring | Derivatives liability | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		265	260
Netting Liabilities		0	0
Net Balance, Liabilities		265	260
Fair Value, Recurring | Derivatives liability | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		56	40
Netting Liabilities		0	0
Net Balance, Liabilities		56	40
Fair Value, Recurring | Derivatives liability | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Netting Liabilities		(11,939)	(15,431)
Net Balance, Liabilities		(11,939)	(15,431)
Fair Value, Recurring | Long-term debt | Long-term debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		7,145	7,539
Net Balance, Liabilities		7,145	7,539
Fair Value, Recurring | Other liabilities | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities			10
Net Balance, Liabilities			10
Fair Value, Recurring | Trading assets, excluding derivatives | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		5,267	4,772
Net Balance, Assets		5,267	4,772
Fair Value, Recurring | Trading assets, excluding derivatives | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		759	4,019
Net Balance, Assets		759	4,019
Fair Value, Recurring | Trading assets, excluding derivatives | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		14,344	11,702
Net Balance, Assets		14,344	11,702
Fair Value, Recurring | Trading assets, excluding derivatives | Precious metals trading
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		160	346
Net Balance, Assets		160	346
Fair Value, Recurring | Derivative assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		12,832	17,169
Netting, Assets		(11,598)	(15,870)
Net Balance, Assets		1,234	1,299
Fair Value, Recurring | Derivative assets | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		907	1,255
Netting, Assets		0	0
Net Balance, Assets		907	1,255
Fair Value, Recurring | Derivative assets | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		9,573	13,606
Netting, Assets		0	0
Net Balance, Assets		9,573	13,606
Fair Value, Recurring | Derivative assets | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		931	1,041
Netting, Assets		0	0
Net Balance, Assets		931	1,041
Fair Value, Recurring | Derivative assets | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		1,288	1,153
Netting, Assets		0	0
Net Balance, Assets		1,288	1,153
Fair Value, Recurring | Derivative assets | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		122	109
Netting, Assets		0	0
Net Balance, Assets		122	109
Fair Value, Recurring | Derivative assets | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		11	5
Netting, Assets		0	0
Net Balance, Assets		11	5
Fair Value, Recurring | Derivative assets | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Netting, Assets		(11,598)	(15,870)
Net Balance, Assets		(11,598)	(15,870)
Fair Value, Recurring | Loans | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		12	15
Net Balance, Assets		12	15
Fair Value, Recurring | Loans | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		673	250
Net Balance, Assets		673	250
Fair Value, Recurring | Other assets | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		130	127
Net Balance, Assets		130	127
Fair Value, Recurring | Other assets | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			10
Net Balance, Assets			10
Fair Value, Recurring | Other assets | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		7	19
Net Balance, Assets		7	19
Fair Value, Recurring | Other assets | Equity securities measured at net asset value
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		130	143
Net Balance, Assets		130	143
Fair Value, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		33,135	29,460
Gross Balance, Liabilities		1,529	1,704
Fair Value, Recurring | Level 1 | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		10,012	7,799
Fair Value, Recurring | Level 1 | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		3,970	2,359
Fair Value, Recurring | Level 1 | Home equity
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		0	0
Fair Value, Recurring | Level 1 | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		0	0
Fair Value, Recurring | Level 1 | Domestic Deposits | Domestic deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Trading liabilities, excluding derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,528	1,688
Fair Value, Recurring | Level 1 | Derivatives liability
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1	16
Fair Value, Recurring | Level 1 | Derivatives liability | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1	16
Fair Value, Recurring | Level 1 | Derivatives liability | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Derivatives liability | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Derivatives liability | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Derivatives liability | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Derivatives liability | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Derivatives liability | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Long-term debt | Long-term debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Other liabilities | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities			0
Fair Value, Recurring | Level 1 | Trading assets, excluding derivatives | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		4,038	3,564
Fair Value, Recurring | Level 1 | Trading assets, excluding derivatives | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		759	4,019
Fair Value, Recurring | Level 1 | Trading assets, excluding derivatives | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		14,344	11,702
Fair Value, Recurring | Level 1 | Trading assets, excluding derivatives | Precious metals trading
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Derivative assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		12	17
Fair Value, Recurring | Level 1 | Derivative assets | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		7	7
Fair Value, Recurring | Level 1 | Derivative assets | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Derivative assets | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		5	7
Fair Value, Recurring | Level 1 | Derivative assets | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	3
Fair Value, Recurring | Level 1 | Derivative assets | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Derivative assets | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Derivative assets | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Loans | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Loans | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Other assets | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Other assets | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			0
Fair Value, Recurring | Level 1 | Other assets | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Other assets | Equity securities measured at net asset value
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		26,573	34,310
Gross Balance, Liabilities		20,231	24,489
Fair Value, Recurring | Level 2 | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		11,858	15,324
Fair Value, Recurring | Level 2 | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		0	110
Fair Value, Recurring | Level 2 | Home equity
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		0	0
Fair Value, Recurring | Level 2 | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		0	0
Fair Value, Recurring | Level 2 | Domestic Deposits | Domestic deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		2,182	1,528
Fair Value, Recurring | Level 2 | Trading liabilities, excluding derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		238	301
Fair Value, Recurring | Level 2 | Derivatives liability
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		13,096	17,030
Fair Value, Recurring | Level 2 | Derivatives liability | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		752	1,100
Fair Value, Recurring | Level 2 | Derivatives liability | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		9,680	13,534
Fair Value, Recurring | Level 2 | Derivatives liability | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,129	1,104
Fair Value, Recurring | Level 2 | Derivatives liability | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,271	1,033
Fair Value, Recurring | Level 2 | Derivatives liability | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		264	259
Fair Value, Recurring | Level 2 | Derivatives liability | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 2 | Derivatives liability | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 2 | Long-term debt | Long-term debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		4,715	5,620
Fair Value, Recurring | Level 2 | Other liabilities | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities			10
Fair Value, Recurring | Level 2 | Trading assets, excluding derivatives | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		1,229	1,208
Fair Value, Recurring | Level 2 | Trading assets, excluding derivatives | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2 | Trading assets, excluding derivatives | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2 | Trading assets, excluding derivatives | Precious metals trading
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		160	346
Fair Value, Recurring | Level 2 | Derivative assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		12,589	16,952
Fair Value, Recurring | Level 2 | Derivative assets | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		897	1,246
Fair Value, Recurring | Level 2 | Derivative assets | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		9,568	13,605
Fair Value, Recurring | Level 2 | Derivative assets | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		714	844
Fair Value, Recurring | Level 2 | Derivative assets | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		1,288	1,150
Fair Value, Recurring | Level 2 | Derivative assets | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		122	107
Fair Value, Recurring | Level 2 | Derivative assets | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2 | Derivative assets | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2 | Loans | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		12	15
Fair Value, Recurring | Level 2 | Loans | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		595	218
Fair Value, Recurring | Level 2 | Other assets | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		130	127
Fair Value, Recurring | Level 2 | Other assets | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			10
Fair Value, Recurring | Level 2 | Other assets | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2 | Other assets | Equity securities measured at net asset value
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		418	355
Gross Balance, Liabilities		3,044	2,429
Fair Value, Recurring | Level 3 | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		0	0
Fair Value, Recurring | Level 3 | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		0	0
Fair Value, Recurring | Level 3 | Home equity
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		10	12
Fair Value, Recurring | Level 3 | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		92	92
Fair Value, Recurring | Level 3 | Domestic Deposits | Domestic deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		412	293
Fair Value, Recurring | Level 3 | Trading liabilities, excluding derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 3 | Derivatives liability
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		202	217
Fair Value, Recurring | Level 3 | Derivatives liability | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		5	6
Fair Value, Recurring | Level 3 | Derivatives liability | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		5	1
Fair Value, Recurring | Level 3 | Derivatives liability | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		135	169
Fair Value, Recurring | Level 3 | Derivatives liability | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 3 | Derivatives liability | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1	1
Fair Value, Recurring | Level 3 | Derivatives liability | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		56	40
Fair Value, Recurring | Level 3 | Derivatives liability | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 3 | Long-term debt | Long-term debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		2,430	1,919
Fair Value, Recurring | Level 3 | Other liabilities | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities			0
Fair Value, Recurring | Level 3 | Trading assets, excluding derivatives | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Trading assets, excluding derivatives | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Trading assets, excluding derivatives | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Trading assets, excluding derivatives | Precious metals trading
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Derivative assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		231	200
Fair Value, Recurring | Level 3 | Derivative assets | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		3	2
Fair Value, Recurring | Level 3 | Derivative assets | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		5	1
Fair Value, Recurring | Level 3 | Derivative assets | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		212	190
Fair Value, Recurring | Level 3 | Derivative assets | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Derivative assets | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	2
Fair Value, Recurring | Level 3 | Derivative assets | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		11	5
Fair Value, Recurring | Level 3 | Derivative assets | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Loans | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Loans | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		78	32
Fair Value, Recurring | Level 3 | Other assets | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Other assets | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			0
Fair Value, Recurring | Level 3 | Other assets | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		7	19
Fair Value, Recurring | Level 3 | Other assets | Equity securities measured at net asset value
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		$ 0	$ 0
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Fair Value Measurements - Chang

Fair Value Measurements - Changes in Fair Value of Level 3 Assets and Liabilities (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net income	Net income	Net income	Net income
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net income	Net income	Net income	Net income
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net income	Net income	Net income	Net income
Derivatives liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total liabilities, ending balance	$ (202)	$ (237)	$ (202)	$ (237)
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total assets, beginning balance	185	77	138	(83)
Assets, Total Realized/Unrealized Gains (Losses) Included in Earnings	31	(113)	77	67
Assets, Total Realized/Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss)	2	(2)	0	(3)
Assets, Purchases	16	0	52	3
Assets, Issuances	0	0	0	0
Assets, Settlements	(40)	16	(59)	12
Assets, Transfers Into Level 3	46	40	50	39
Assets Transfers out of Level 3	(24)	(2)	(42)	(19)
Total assets, ending balance	216	16	216	16
Assets, Current Period Unrealized Gains (Losses) Still Held Included in Earnings	54	(64)	74	34
Assets, Current Period Unrealized Gains (Losses) Still Held Included in Other Comprehensive Income (Loss)	2	(2)	0	(3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total liabilities, beginning balance	(2,496)	(2,532)	(2,212)	(3,012)
Total Realized/Unrealized Gains (Losses) Included in Earnings	(112)	43	(258)	(248)
Total Realized/Unrealized Gains (Losses) Included in Other Comprehensive Income	0	1	(4)	5
Purchases	0	0	0	0
Issuances	(819)	(241)	(1,769)	(616)
Settlements	369	352	987	896
Transfers Into Level 3	(3)	(48)	(51)	(84)
Transfers Out of Level 3	219	198	465	832
Total liabilities, ending balance	(2,842)	(2,227)	(2,842)	(2,227)
Current Period Unrealized Gains (Losses) Still Held Included in Earnings	(71)	67	(125)	(71)
Current Period Unrealized Gains (Losses) Still Held Included in Other Comprehensive Income (Loss)	0	1	(4)	5
Level 3 | Interest rate contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivatives, net, Beginning Balance	(3)	(5)	(4)	(5)
Derivatives, net, Total Realized/Unrealized Gains (Losses) Included in Earnings	2	0	1	0
Derivatives, net, Total Realized/Unrealized Gains (Losses) Included in Other Comprehensive Income	0	0	0	0
Derivatives, net, Purchases	0	0	0	0
Derivatives, net, Issuances	0	0	0	0
Derivatives, net, Settlements	0	0	0	0
Derivatives, net, Transfers into Level 3	(1)	0	1	0
Derivatives, net, Transfers out of Level 3	0	0	0	0
Derivatives, net, Ending Balance	(2)	(5)	(2)	(5)
Derivatives, net, Current Period Unrealized Gains (Losses) Still Held Included in Earnings	2	0	1	0
Derivatives, net, Current Period Unrealized Gains (Losses) Still Held Included in Other Comprehensive Income (Loss)	0	0	0	0
Level 3 | Foreign exchange contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivatives, net, Beginning Balance	0	0	0	0
Derivatives, net, Total Realized/Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Derivatives, net, Total Realized/Unrealized Gains (Losses) Included in Other Comprehensive Income	0	0	0	0
Derivatives, net, Purchases	0	0	0	0
Derivatives, net, Issuances	0	0	0	0
Derivatives, net, Settlements	0	0	0	0
Derivatives, net, Transfers into Level 3	0	0	0	0
Derivatives, net, Transfers out of Level 3	0	0	0	0
Derivatives, net, Ending Balance	0	0	0	0
Derivatives, net, Current Period Unrealized Gains (Losses) Still Held Included in Earnings	0	0	0	0
Derivatives, net, Current Period Unrealized Gains (Losses) Still Held Included in Other Comprehensive Income (Loss)	0	0	0	0
Level 3 | Equity contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivatives, net, Beginning Balance	49	(25)	21	(226)
Derivatives, net, Total Realized/Unrealized Gains (Losses) Included in Earnings	61	(83)	113	106
Derivatives, net, Total Realized/Unrealized Gains (Losses) Included in Other Comprehensive Income	0	0	0	0
Derivatives, net, Purchases	0	0	0	0
Derivatives, net, Issuances	0	0	0	0
Derivatives, net, Settlements	(25)	3	(25)	21
Derivatives, net, Transfers into Level 3	4	4	(3)	3
Derivatives, net, Transfers out of Level 3	(12)	3	(29)	(2)
Derivatives, net, Ending Balance	77	(98)	77	(98)
Derivatives, net, Current Period Unrealized Gains (Losses) Still Held Included in Earnings	53	(63)	75	35
Derivatives, net, Current Period Unrealized Gains (Losses) Still Held Included in Other Comprehensive Income (Loss)	0	0	0	0
Level 3 | Credit contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivatives, net, Beginning Balance	(4)	2	1	2
Derivatives, net, Total Realized/Unrealized Gains (Losses) Included in Earnings	0	0	(4)	0
Derivatives, net, Total Realized/Unrealized Gains (Losses) Included in Other Comprehensive Income	0	0	0	0
Derivatives, net, Purchases	0	0	0	0
Derivatives, net, Issuances	0	0	0	0
Derivatives, net, Settlements	0	0	(1)	0
Derivatives, net, Transfers into Level 3	0	0	(3)	0
Derivatives, net, Transfers out of Level 3	3	0	6	0
Derivatives, net, Ending Balance	(1)	2	(1)	2
Derivatives, net, Current Period Unrealized Gains (Losses) Still Held Included in Earnings	0	0	(1)	0
Derivatives, net, Current Period Unrealized Gains (Losses) Still Held Included in Other Comprehensive Income (Loss)	0	0	0	0
Level 3 | Other Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivatives, net, Beginning Balance	(21)	(24)	(35)	(33)
Derivatives, net, Total Realized/Unrealized Gains (Losses) Included in Earnings	(31)	(31)	(33)	(40)
Derivatives, net, Total Realized/Unrealized Gains (Losses) Included in Other Comprehensive Income	0	0	0	0
Derivatives, net, Purchases	0	0	0	0
Derivatives, net, Issuances	0	0	0	0
Derivatives, net, Settlements	7	15	23	33
Derivatives, net, Transfers into Level 3	0	0	0	0
Derivatives, net, Transfers out of Level 3	0	0	0	0
Derivatives, net, Ending Balance	(45)	(40)	(45)	(40)
Derivatives, net, Current Period Unrealized Gains (Losses) Still Held Included in Earnings	0	0	0	0
Derivatives, net, Current Period Unrealized Gains (Losses) Still Held Included in Other Comprehensive Income (Loss)	$ 0	$ 0	$ 0	$ 0
Asset-backed securities available-for-sale
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other comprehensive income (loss), net of tax	Other comprehensive income (loss), net of tax	Other comprehensive income (loss), net of tax	Other comprehensive income (loss), net of tax
Asset-backed securities available-for-sale | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total assets, beginning balance	$ 101	$ 105	$ 104	$ 108
Assets, Total Realized/Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Assets, Total Realized/Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss)	2	(2)	0	(3)
Assets, Purchases	0	0	0	0
Assets, Issuances	0	0	0	0
Assets, Settlements	(1)	(2)	(2)	(4)
Assets, Transfers Into Level 3	0	0	0	0
Assets Transfers out of Level 3	0	0	0	0
Total assets, ending balance	102	101	102	101
Assets, Current Period Unrealized Gains (Losses) Still Held Included in Earnings	0	0	0	0
Assets, Current Period Unrealized Gains (Losses) Still Held Included in Other Comprehensive Income (Loss)	$ 2	$ (2)	$ 0	$ (3)
Mortgage servicing rights
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (loss)	Other income (loss)	Other income (loss)	Other income (loss)
Mortgage servicing rights | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total assets, beginning balance	$ 19	$ 21	$ 19	$ 22
Assets, Total Realized/Unrealized Gains (Losses) Included in Earnings	(1)	(1)	(1)	(1)
Assets, Total Realized/Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss)	0	0	0	0
Assets, Purchases	0	0	0	0
Assets, Issuances	0	0	0	0
Assets, Settlements	(11)	0	(11)	(1)
Assets, Transfers Into Level 3	0	0	0	0
Assets Transfers out of Level 3	0	0	0	0
Total assets, ending balance	7	20	7	20
Assets, Current Period Unrealized Gains (Losses) Still Held Included in Earnings	(1)	(1)	(1)	(1)
Assets, Current Period Unrealized Gains (Losses) Still Held Included in Other Comprehensive Income (Loss)	0	0	0	0
Derivative assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total assets, ending balance	231	96	231	96
Domestic deposits | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total liabilities, beginning balance	(386)	(241)	(293)	(373)
Total Realized/Unrealized Gains (Losses) Included in Earnings	(16)	6	(23)	5
Total Realized/Unrealized Gains (Losses) Included in Other Comprehensive Income	0	1	(3)	2
Purchases	0	0	0	0
Issuances	(86)	(43)	(230)	(44)
Settlements	23	26	71	128
Transfers Into Level 3	0	0	(1)	0
Transfers Out of Level 3	53	1	67	32
Total liabilities, ending balance	(412)	(250)	(412)	(250)
Current Period Unrealized Gains (Losses) Still Held Included in Earnings	(7)	7	(6)	10
Current Period Unrealized Gains (Losses) Still Held Included in Other Comprehensive Income (Loss)	0	1	(3)	2
Long-term debt | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total liabilities, beginning balance	(2,110)	(2,291)	(1,919)	(2,639)
Total Realized/Unrealized Gains (Losses) Included in Earnings	(96)	37	(235)	(253)
Total Realized/Unrealized Gains (Losses) Included in Other Comprehensive Income	0	0	(1)	3
Purchases	0	0	0	0
Issuances	(733)	(198)	(1,539)	(572)
Settlements	346	326	916	768
Transfers Into Level 3	(3)	(48)	(50)	(84)
Transfers Out of Level 3	166	197	398	800
Total liabilities, ending balance	(2,430)	(1,977)	(2,430)	(1,977)
Current Period Unrealized Gains (Losses) Still Held Included in Earnings	(64)	60	(119)	(81)
Current Period Unrealized Gains (Losses) Still Held Included in Other Comprehensive Income (Loss)	0	0	(1)	3
Loans held for sale | Loans | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total assets, beginning balance	44	3	32	49
Assets, Total Realized/Unrealized Gains (Losses) Included in Earnings	0	2	1	2
Assets, Total Realized/Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss)	0	0	0	0
Assets, Purchases	16	0	52	3
Assets, Issuances	0	0	0	0
Assets, Settlements	(10)	0	(43)	(37)
Assets, Transfers Into Level 3	43	36	55	36
Assets Transfers out of Level 3	(15)	(5)	(19)	(17)
Total assets, ending balance	78	36	78	36
Assets, Current Period Unrealized Gains (Losses) Still Held Included in Earnings	0	0	0	0
Assets, Current Period Unrealized Gains (Losses) Still Held Included in Other Comprehensive Income (Loss)	$ 0	$ 0	$ 0	$ 0

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative Information about Recurring Fair Value Measurement of Assets and Liabilities Classified as Level 3 (Detail) $ in Millions		Sep. 30, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($)
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Fair Value	[1]	$ 25,942	$ 25,696
Long-term debt	[1]	(18,410)	(18,661)
Level 3
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Commercial loans held-for-sale		78	32
Mortgage servicing rights		7	19
Domestic deposits		(412)	(293)
Long-term debt		0	0
Structured notes | Level 3
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-term debt		(2,430)	(1,919)
Asset-backed securities | Level 3
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Fair Value		102	104
Interest rate contracts | Level 3
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative assets (liability		(2)	(4)
Foreign exchange contracts | Level 3
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative assets (liability		0	0
Equity contracts | Level 3
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative assets (liability		77	21
Credit contracts | Level 3
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative assets (liability		(1)	1
Other Contracts | Level 3
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative assets (liability		$ (45)	$ (35)
Probability to fund for rate lock commitments | Interest rate contracts | Recurring | Minimum | Market comparable adjusted for probability to fund and, where applicable, option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		0.58	0.71
Probability to fund for rate lock commitments | Interest rate contracts | Recurring | Maximum | Market comparable adjusted for probability to fund and, where applicable, option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		1	0.92
Probability to fund for rate lock commitments | Interest rate contracts | Recurring | Weighted Average | Market comparable adjusted for probability to fund and, where applicable, option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		0.94	0.84
Interest rate yield curve | Interest rate contracts | Recurring | Market comparable adjusted for probability to fund and, where applicable, option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		0.09	0.09
Cross-currency basis | Foreign exchange contracts | Recurring | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		(0.0062)	0.0008
Equity / Equity Index volatility | Recurring | Minimum | Option adjusted discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Domestic deposits		0.06	0.07
Equity / Equity Index volatility | Recurring | Minimum | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-term debt		0.06	0.07
Equity / Equity Index volatility | Recurring | Maximum | Option adjusted discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Domestic deposits		0.55	0.29
Equity / Equity Index volatility | Recurring | Maximum | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-term debt		0.95	0.95
Equity / Equity Index volatility | Recurring | Weighted Average | Option adjusted discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Domestic deposits		0.14	0.13
Equity / Equity Index volatility | Recurring | Weighted Average | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-term debt		0.26	0.22
Equity / Equity Index volatility | Equity contracts | Recurring | Minimum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		0.06	0.06
Equity / Equity Index volatility | Equity contracts | Recurring | Maximum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		1.12	1.11
Equity / Equity Index volatility | Equity contracts | Recurring | Weighted Average | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		0.49	0.41
Equity / Equity and Equity / Index correlation | Recurring | Minimum | Option adjusted discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Domestic deposits		0.42	0.51
Equity / Equity and Equity / Index correlation | Recurring | Minimum | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-term debt		0.35	0.45
Equity / Equity and Equity / Index correlation | Recurring | Maximum | Option adjusted discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Domestic deposits		0.90	0.93
Equity / Equity and Equity / Index correlation | Recurring | Maximum | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-term debt		0.98	0.97
Equity / Equity and Equity / Index correlation | Recurring | Weighted Average | Option adjusted discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Domestic deposits		0.69	0.71
Equity / Equity and Equity / Index correlation | Recurring | Weighted Average | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-term debt		0.85	0.84
Equity / Equity and Equity / Index correlation | Equity contracts | Recurring | Minimum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		0.35	0.45
Equity / Equity and Equity / Index correlation | Equity contracts | Recurring | Maximum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		0.98	0.97
Equity / Equity and Equity / Index correlation | Equity contracts | Recurring | Weighted Average | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		0.83	0.84
Equity forward price | Equity contracts | Recurring | Minimum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives | $ / shares		0
Equity forward price | Equity contracts | Recurring | Maximum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives | $ / shares		7,307
Equity forward price | Equity contracts | Recurring | Weighted Average | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives | $ / shares		1,115
Equity forward price | Equity contracts | Recurring | Minimum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives			41
Equity forward price | Equity contracts | Recurring | Maximum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives			6,245
Equity forward price | Equity contracts | Recurring | Weighted Average | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives			643
Credit default swap spreads | Recurring | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-term debt		0.0742	0.0948
Credit default swap spreads | Credit contracts | Recurring | Minimum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		0.0017	0.0059
Credit default swap spreads | Credit contracts | Recurring | Maximum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		0.0782	0.1558
Credit default swap spreads | Credit contracts | Recurring | Weighted Average | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		0.0085	0.0160
Conversion rate | Other Contracts | Recurring | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		1.5	1.6
Expected duration | Other Contracts | Recurring | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivatives		1.5	1
Market assumptions related to yields for comparable instruments | Recurring | Minimum | Market comparables and internal assumptions
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Loans Held-for-sale, Measurement Input		0.95	0.78
Market assumptions related to yields for comparable instruments | Recurring | Maximum | Market comparables and internal assumptions
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Loans Held-for-sale, Measurement Input		1.01	1
Market assumptions related to yields for comparable instruments | Recurring | Weighted Average | Market comparables and internal assumptions
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Loans Held-for-sale, Measurement Input		0.97	0.90
Market assumptions related to yields for comparable instruments | Asset-backed securities | Recurring | Minimum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Available for sale securities		0.02	0.02
Market assumptions related to yields for comparable instruments | Asset-backed securities | Recurring | Maximum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Available for sale securities		0.03	0.03
Market assumptions related to yields for comparable instruments | Asset-backed securities | Recurring | Weighted Average | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Available for sale securities		0.02	0.02
Constant prepayment rates | Recurring | Minimum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Mortgage servicing rights		0.07	0.06
Constant prepayment rates | Recurring | Maximum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Mortgage servicing rights		0.20	0.17
Constant prepayment rates | Recurring | Weighted Average | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Mortgage servicing rights		0.07	0.06
Discount rate | Recurring | Minimum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Mortgage servicing rights		0.10	0.10
Discount rate | Recurring | Maximum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Mortgage servicing rights		0.14	0.14
Discount rate | Recurring | Weighted Average | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Mortgage servicing rights		0.10	0.10
Estimated annualized costs to service | Recurring | Minimum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Mortgage servicing rights		70	72
Estimated annualized costs to service | Recurring | Maximum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Mortgage servicing rights		79	77
Estimated annualized costs to service | Recurring | Weighted Average | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Mortgage servicing rights		76	74
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unfunded commitments, equity securities measured at net asset value	$ 20		$ 20			$ 21
Revaluation period			90 days
Deferred fee income	3		$ 3			3
Unfunded Loan Commitment
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Deferred fee income	167		167			162
Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Transfers Out of Level 3	219	$ 198	465	$ 832
Assets Transfers out of Level 3	(24)	(2)	(42)	(19)
Transfers into Level 3	3	48	51	84
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	46	40	50	39
Fair Value (in millions)	216	16	216	16	$ 185	138	$ 77	$ (83)
Level 3 | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivatives, net, Transfers out of Level 3	12	(3)	29	2
Level 3 | Long-term debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Transfers Out of Level 3	166	197	398	800
Transfers into Level 3	3	48	50	84
Level 3 | Deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Transfers Out of Level 3	53	1	67	32
Transfers into Level 3	0	0	1	0
Level 3 | Commercial loans held for sale | Loans, net
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets Transfers out of Level 3	(15)	(5)	(19)	(17)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	43	36	55	36
Fair Value (in millions)	$ 78	$ 36	$ 78	$ 36	$ 44	$ 32	$ 3	$ 49

Fair Value Measurements - Ass_2

Fair Value Measurements - Assets and Liabilities Recorded as Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total Gains (Losses)	$ 11	$ 1	$ (48)	$ (60)
Consumer loans
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total Gains (Losses)	1	1	3	0
Commercial loans held for sale
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total Gains (Losses)	1	6	3	(31)
Commercial Loans
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total Gains (Losses)	9	(6)	(39)	(15)
Leases [Member]
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total Gains (Losses)	0	$ 0	(15)	$ (14)
Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	530		530		$ 480
Fair Value, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0		0		0
Fair Value, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	102		102		106
Fair Value, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	428		428		374
Fair Value, Nonrecurring | Consumer loans
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	102		102		106
Fair Value, Nonrecurring | Consumer loans | Level 1
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0		0		0
Fair Value, Nonrecurring | Consumer loans | Level 2
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	102		102		106
Fair Value, Nonrecurring | Consumer loans | Level 3
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0		0		0
Fair Value, Nonrecurring | Commercial loans held for sale
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0		0		0
Fair Value, Nonrecurring | Commercial loans held for sale | Level 1
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0		0		0
Fair Value, Nonrecurring | Commercial loans held for sale | Level 2
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0		0		0
Fair Value, Nonrecurring | Commercial loans held for sale | Level 3
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0		0		0
Fair Value, Nonrecurring | Commercial Loans
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	428		428		374
Fair Value, Nonrecurring | Commercial Loans | Level 1
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0		0		0
Fair Value, Nonrecurring | Commercial Loans | Level 2
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0		0		0
Fair Value, Nonrecurring | Commercial Loans | Level 3
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	428		428		374
Fair Value, Nonrecurring | Leases [Member]
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0		0		0
Fair Value, Nonrecurring | Leases [Member] | Level 1
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0		0		0
Fair Value, Nonrecurring | Leases [Member] | Level 2
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0		0		0
Fair Value, Nonrecurring | Leases [Member] | Level 3
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	$ 0		$ 0		$ 0

Fair Value Measurements - Qua_2

Fair Value Measurements - Quantitative Information about Nonrecurring Fair Value Measurement of Assets and Liabilities Classified as Level 3 (Detail) - Fair Value, Nonrecurring $ in Millions	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	$ 530	$ 480
Commercial loans held for sale
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0	0
Commercial Loans
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	428	374
Level 3
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	428	374
Level 3 | Commercial loans held for sale
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	0	0
Level 3 | Commercial Loans
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Total assets at fair value on a non-recurring basis	$ 428	$ 374
Loss severity rates | Level 3 | Commercial Loans | Minimum | Valuation of third-party appraisal on underlying collateral
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Range of Inputs	0	0.01
Loss severity rates | Level 3 | Commercial Loans | Maximum | Valuation of third-party appraisal on underlying collateral
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Range of Inputs	1	0.93
Loss severity rates | Level 3 | Commercial Loans | Weighted Average | Valuation of third-party appraisal on underlying collateral
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]
Range of Inputs	0.22	0.25

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information Relating To Asset-Backed Securities and Collateralized Debt Obligations (Detail) - Level 3 $ in Millions	Sep. 30, 2024 USD ($)
Asset-backed securities available-for-sale
Fair Value Of Other Financial Instrument [Line Items]
Trading asset-backed securities and related collateral	$ 102
Other | BBB - B
Fair Value Of Other Financial Instrument [Line Items]
Trading asset-backed securities and related collateral	92
Alt A | Home equity | AAA - A
Fair Value Of Other Financial Instrument [Line Items]
Trading asset-backed securities and related collateral	$ 10

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions		Sep. 30, 2024		Dec. 31, 2023		Sep. 30, 2023
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Federal funds sold and securities purchased under agreements to resell	[1]	$ 4,310		$ 13,878
Total loans, net		61,467	[1]	58,396	[1]	$ 57,016
Loans held for sale	[1]	744		339
Deposits		123,373	[1]	121,283	[1]	$ 119,928
Long-term debt	[1]	18,410		18,661
Level 1
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Short-term financial assets, net of allowance for credit losses		725		704
Federal funds sold and securities purchased under agreements to resell		0		0
Securities held-to-maturity, net of allowance for credit losses		2,798		0
Short-term financial liabilities		0		0
Deposits		0		0
Long-term debt		0		0
Level 1 | Commercial loans
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Total loans, net		0		0
Loans held for sale		0		0
Level 1 | Consumer loans
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Total loans, net		0		0
Loans held for sale		0
Level 2
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Short-term financial assets, net of allowance for credit losses		28,334		25,015
Federal funds sold and securities purchased under agreements to resell		4,310		13,878
Securities held-to-maturity, net of allowance for credit losses		14,238		14,689
Short-term financial liabilities		7,653		9,914
Deposits		120,804		119,465
Long-term debt		11,725		11,645
Level 2 | Commercial loans
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Total loans, net		0		0
Loans held for sale		69		89
Level 2 | Consumer loans
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Total loans, net		0		0
Loans held for sale		2
Level 3
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Short-term financial assets, net of allowance for credit losses		3		13
Federal funds sold and securities purchased under agreements to resell		0		0
Securities held-to-maturity, net of allowance for credit losses		0		0
Short-term financial liabilities		3		13
Deposits		0		0
Long-term debt		0		0
Level 3 | Commercial loans
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Total loans, net		41,474		40,557
Loans held for sale		0		0
Level 3 | Consumer loans
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Total loans, net		19,208		17,043
Loans held for sale		0
Carrying Value
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Short-term financial assets, net of allowance for credit losses		29,062		25,732
Federal funds sold and securities purchased under agreements to resell		4,310		13,878
Securities held-to-maturity, net of allowance for credit losses		17,238		15,076
Short-term financial liabilities		7,656		9,927
Deposits		120,779		119,462
Long-term debt		11,265		11,122
Carrying Value | Commercial loans
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Total loans, net		40,584		39,383
Loans held for sale		69		89
Carrying Value | Consumer loans
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Total loans, net		20,871		18,998
Loans held for sale		2
Fair Value
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Short-term financial assets, net of allowance for credit losses		29,062		25,732
Federal funds sold and securities purchased under agreements to resell		4,310		13,878
Securities held-to-maturity, net of allowance for credit losses		17,036		14,689
Short-term financial liabilities		7,656		9,927
Deposits		120,804		119,465
Long-term debt		11,725		11,645
Fair Value | Commercial loans
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Total loans, net		41,474		40,557
Loans held for sale		69		89
Fair Value | Consumer loans
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Total loans, net		19,208		$ 17,043
Loans held for sale		$ 2
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024 December 31, 2023 (in millions) Assets Other assets $ 13 $ 23 Total assets $ 13 $ 23 Liabilities Interest, taxes and other liabilities $ 21 $ 17 Total liabilities $ 21 $ 17

Litigation and Regulatory Mat_2

Litigation and Regulatory Matters - Narrative (Details) $ in Millions	Sep. 30, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Estimate of reasonably possible loss	$ 100