Interactive Brokers (IBKR) 10-K 26 Feb 24 2023 FY Annual report Financial data

Documentation and Entity Inform

Documentation and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Feb. 21, 2024	Jun. 30, 2023
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-33440
Entity Registrant Name	INTERACTIVE BROKERS GROUP, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	30-0390693
Entity Address, Address Line One	One Pickwick Plaza
Entity Address, City or Town	Greenwich
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06830
City Area Code	203
Local Phone Number	618-5800
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	IBKR
Security Exchange Name	NASDAQ
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 8,396,870,712
Current Fiscal Year End Date	--12-31
Fiscal Period Focus	FY
Fiscal Year Focus	2023
Entity Central Index Key	0001381197
Amendment Flag	false
Documents Incorporated by Reference [Text Block]	Documents Incorporated by Reference: Portions of Registrant’s definitive proxy statement for its 2024 annual meeting of shareholders are incorporated by reference in Part III of this Form 10 - K.
Auditor Firm ID	34
Auditor Location	New York, New York
Auditor Name	Deloitte & Touche LLP
Common Class A [Member]
Common Stock Shares Outstanding		107,062,321
Common Class B [Member]
Common Stock Shares Outstanding		100

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash and cash equivalents	$ 3,753	$ 3,436
Cash segregated for regulatory purposes	28,840	25,167
Securities - segregated for regulatory purposes	35,386	31,781
Securities borrowed	5,835	4,749
Securities purchased under agreements to resell	5,504	6,029
Financial instruments owned, at fair value	1,488	485
Receivables:
Customers, less allowance for credit losses of $10 and $10 as of December 31, 2023 and 2022	44,472	38,760
Brokers, dealers and clearing organizations	1,643	3,469
Interest	375	341
Total receivables	46,490	42,570
Other assets	1,127	926
Total assets	128,423	115,143
Liabilities and equity
Short-term borrowings	17	18
Securities loaned	11,347	8,940
Financial instruments sold, not yet purchased, at fair value	193	146
Payables
Customers	101,012	93,195
Brokers, dealers and clearing organizations	590	291
Affiliate	210	214
Accounts payable, accrued expenses and other liabilities	676	531
Interest	311	193
Total payables	102,799	94,424
Total liabilities	114,356	103,528
Commitments, contingencies and guarantees (see Note 14)
Stockholders' equity
Additional paid-in capital	1,726	1,581
Retained earnings	1,852	1,294
Accumulated other comprehensive income, net of income taxes of $0 and $0 as of December 31, 2023 and 2022	8	(22)
Treasury stock, at cost, 133,034 and 169,420 shares as of December 31, 2023 and 2022	(3)	(6)
Total stockholders' equity	3,584	2,848
Noncontrolling interests	10,483	8,767
Total equity	14,067	11,615
Total liabilities and stockholders' equity	128,423	115,143
Asset Not Pledged as Collateral [Member]
Assets
Financial instruments owned, at fair value	1,422	396
Asset Pledged as Collateral [Member]
Assets
Financial instruments owned, at fair value	66	89
Common Class A [Member]
Stockholders' equity
Common stock, $0.01 par value per share	1	1
Common Class B [Member]
Stockholders' equity
Common stock, $0.01 par value per share

Consolidated Statements of Fi_2

Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Allowance for credit losses	$ 10	$ 10
Accumulated other comprehensive income tax	$ 0	$ 0
Treasury stock shares	133,034	169,420
Common Class A [Member]
Common stock, par value	$ 0.01	$ 0.01
Shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	107,178,928	103,057,148
Common stock, shares outstanding	107,045,894	102,887,728
Common Class B [Member]
Common stock, par value	$ 0.01	$ 0.01
Shares authorized	100	100
Common stock, shares issued	100	100
Common stock, shares outstanding	100	100

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Commissions	$ 1,360	$ 1,322	$ 1,350
Other fees and services	197	184	218
Other income (loss)	(11)	(107)	(2)
Total non-interest income	1,546	1,399	1,566
Interest income	6,230	2,686	1,372
Interest expense	(3,436)	(1,018)	(224)
Total net interest income	2,794	1,668	1,148
Total net revenues	4,340	3,067	2,714
Non-interest expenses:
Execution, clearing and distribution fees	386	324	236
Employee compensation and benefits	527	454	399
Occupancy, depreciation and amortization	99	90	80
Communications	41	33	33
General and administrative	211	165	176
Customer bad debt	7	3	3
Total non-interest expenses	1,271	1,069	927
Income before income taxes	3,069	1,998	1,787
Income tax expense	257	156	151
Net income	2,812	1,842	1,636
Less net income attributable to noncontrolling interests	2,212	1,462	1,328
Net income available for common stockholders	$ 600	$ 380	$ 308
Earnings per share:
Basic	$ 5.72	$ 3.78	$ 3.27
Diluted	$ 5.67	$ 3.75	$ 3.24
Weighted average common shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	104,965,050	100,460,016	94,167,572
Weighted Average Number of Shares Outstanding, Diluted	105,846,877	101,299,609	95,009,880
Comprehensive income:
Net income available for common stockholders	$ 600	$ 380	$ 308
Other comprehensive income:
Cumulative translation adjustment, before income taxes	30	(26)	(22)
Other comprehensive income (loss), net of tax	30	(26)	(22)
Comprehensive income available for common stockholders	630	354	286
Comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	2,212	1,462	1,328
Other comprehensive income - cumulative translation adjustment	92	(85)	(75)
Comprehensive income attributable to noncontrolling interests	$ 2,304	$ 1,377	$ 1,253

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 2,812	$ 1,842	$ 1,636
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income taxes	30	20	23
Depreciation and amortization	65	58	50
Amortization of right-of-use assets	29	26	24
Employee stock plan compensation	100	92	80
Unrealized (gains) losses on other investments, net	(14)	8	9
Gain on remeasurement of Tax Receivable Agreement liability	(7)	(6)	(1)
Bad debt expense	7	3	3
Impairment loss		1
Shares distributed to customers under IBKR Promotions	12	9	9
Change in operating assets and liabilities:
Securities - segregated for regulatory purposes	(3,605)	(16,660)	12,700
Securities borrowed	(1,086)	(837)	1,044
Securities purchased under agreements to resell	525	(1,649)	(3,588)
Financial instruments owned, at fair value	(1,033)	189	(32)
Receivables from customers	(5,719)	16,172	(15,605)
Other receivables	1,792	88	(2,540)
Other assets	(103)	35	(198)
Securities loaned	2,407	(2,829)	1,931
Financial instruments sold but not yet purchased, at fair value	47	(36)	29
Payable to customers	7,817	7,561	9,754
Other payables	468	(119)	568
Net cash provided by operating activities	4,544	3,968	5,896
Cash flows from investing activities:
Purchases of other investments	(26)	(5)	(116)
Distributions received and proceeds from sales of other investments	23	7	5
Purchase of property, equipment and intangible assets	(49)	(69)	(77)
Net cash used in investing activities	(52)	(67)	(188)
Cash flows from financing activities:
Short-term borrowings, net	(1)	(9)	4
Dividends paid to stockholders	(42)	(40)	(38)
Distributions to noncontrolling interests	(556)	(404)	(374)
Repurchases of common stock for employee tax withholdings	(34)	(20)	(27)
Proceeds from sales of treasury stock	34	23	26
Issuance of senior notes	0	0	1,428
Redemptions of senior notes			(1,524)
Payments made under the Tax Receivable Agreement	(25)	(20)	(18)
Net cash used in financing activities	(624)	(470)	(523)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	122	(111)	(97)
Net increase in cash, cash equivalents and restricted cash	3,990	3,320	5,088
Cash, cash equivalents and restricted cash at beginning of period	28,603	25,283	20,195
Cash, cash equivalents and restricted cash at end of period	32,593	28,603	25,283
Cash, cash equivalents and restricted cash
Cash and cash equivalents	3,753	3,436	2,395
Cash segregated for regulatory purposes	28,840	25,167	22,888
Cash, cash equivalents and restricted cash	32,593	28,603	25,283
Supplemental disclosures of cash flow information:
Cash paid for interest	3,317	833	222
Cash paid for taxes, net	228	148	114
Cash paid for amounts included in lease liabilities	35	32	24
Non-cash financing activities:
Issuance of common stock in exchange of member interests in IBG LLC	229	192	376
Redemption of member interests from IBG Holdings LLC	(229)	(192)	(376)
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC	33	27	25
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC	$ (33)	(27)	(25)
Non-cash distribution to noncontrolling interests		$ (1)	$ (3)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total Stockholders' Equity [Member]	Non-controlling Interests [Member]	Total
Balance at Dec. 31, 2020	$ 1	$ 1,244	$ (3)	$ 683	$ 26	$ 1,951	$ 7,052	$ 9,003
Balance (in shares) at Dec. 31, 2020	90,909,889
Issuance of common stock in follow-on offering		145				145	(145)
Issuance of common stock in follow-on offering, shares	6,079,542
Common Stock distributed pursuant to stock incentive plans (in shares)	1,220,141
Issuance of common stock - IBKR Promotions		3	(11)			(8)	8
Issuance of common stock - IBKR Promotions, shares	150,000
Net distribution of common stocks - IBKR Promotion			9			9		9
Compensation for stock grants vesting in the future		18				18	62	80
Deferred tax benefit retained - follow-on offering		7				7		7
Repurchase of common stock for employee tax withholding under stock incentive plans			(27)			(27)		(27)
Sales of treasury stock			27			27		26
Sales of treasury stock							(1)
Dividends paid to stockholders - $0.10 per share				(38)		(38)		(38)
Distributions from IBG LLC to noncontrolling interests							(377)	(377)
Adjustments for changes in proportionate ownership in IBG LLC		25				25	(25)
Comprehensive income				308	(22)	286	1,253	1,539
Balance at Dec. 31, 2021	$ 1	1,442	(5)	953	4	2,395	7,827	10,222
Balance (in shares) at Dec. 31, 2021	98,359,572
Issuance of common stock in follow-on offering		84				84	(84)
Issuance of common stock in follow-on offering, shares	3,271,390
Common Stock distributed pursuant to stock incentive plans (in shares)	1,276,186
Issuance of common stock - IBKR Promotions		2	(10)			(8)	8
Issuance of common stock - IBKR Promotions, shares	150,000
Net distribution of common stocks - IBKR Promotion			9			9		9
Compensation for stock grants vesting in the future		23				23	69	92
Deferred tax benefit retained - follow-on offering		3				3		3
Repurchase of common stock for employee tax withholding under stock incentive plans			(20)			(20)		(20)
Sales of treasury stock			20	1		21		23
Sales of treasury stock							2
Dividends paid to stockholders - $0.10 per share				(40)		(40)		(40)
Distributions from IBG LLC to noncontrolling interests							(405)	(405)
Adjustments for changes in proportionate ownership in IBG LLC		27				27	(27)
Comprehensive income				380	(26)	354	1,377	1,731
Balance at Dec. 31, 2022	$ 1	1,581	(6)	1,294	(22)	2,848	8,767	11,615
Balance (in shares) at Dec. 31, 2022	103,057,148
Issuance of common stock in follow-on offering		81				81	(81)
Issuance of common stock in follow-on offering, shares	2,632,748
Common Stock distributed pursuant to stock incentive plans (in shares)	1,389,032
Issuance of common stock - IBKR Promotions		2	(8)			(6)	6
Issuance of common stock - IBKR Promotions, shares	100,000
Net distribution of common stocks - IBKR Promotion			11			11	1	12
Compensation for stock grants vesting in the future		25				25	75	100
Deferred tax benefit retained - follow-on offering		4				4		4
Repurchase of common stock for employee tax withholding under stock incentive plans			(34)			(34)		(34)
Sales of treasury stock			34			34		34
Dividends paid to stockholders - $0.10 per share				(42)		(42)		(42)
Distributions from IBG LLC to noncontrolling interests							(556)	(556)
Adjustments for changes in proportionate ownership in IBG LLC		33				33	(33)
Comprehensive income				600	30	630	2,304	2,934
Balance at Dec. 31, 2023	$ 1	$ 1,726	$ (3)	$ 1,852	$ 8	$ 3,584	$ 10,483	$ 14,067
Balance (in shares) at Dec. 31, 2023	107,178,928

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Consolidated Statements of Changes in Equity [Abstract]
Dividend per share	$ 0.10	$ 0.10	$ 0.10

Organization Of Business

Organization Of Business	12 Months Ended
	Dec. 31, 2023
Organization Of Business [Abstract]
Organization Of Business	1. Organization of Business Interactive Brokers Group, Inc. (“IBG, Inc.”) is a Delaware holding company whose primary asset is its ownership of approximately 25.4 % of the membership interests of IBG LLC, which, in turn, owns operating subsidiaries (collectively, “IBG LLC”). IBG, Inc. together with IBG LLC and its consolidated subsidiaries (collectively, “the Company”), is an automated global electronic broker specializing in executing and clearing trades in stocks, options, futures, foreign exchange instruments, bonds, mutual funds, exchange-traded funds (“ETFs”) and precious metals on more than 150 electronic exchanges and market centers around the world and offering custody, prime brokerage, securities and margin lending services to customers. In addition, the Company’s customers can use its trading platform to trade certain cryptocurrencies through third-party cryptocurrency service providers that execute, clear and custody the cryptocurrencies. In the United States of America (“U.S.”), the Company conducts its business primarily from its headquarters in Greenwich, Connecticut and from Chicago, Illinois. Abroad, the Company conducts its business through offices located in Canada, the United Kingdom, Ireland, Switzerland, Hungary, India, China (Hong Kong and Shanghai), Japan, Singapore, and Australia. As of December 31, 2023, the Company had 2,932 employees worldwide. IBG LLC is a Connecticut limited liability company that conducts its business through its significant operating subsidiaries: Interactive Brokers LLC (“IB LLC”); IBKR Securities Services LLC (“IBKRSS”); Interactive Brokers Canada Inc. (“IBC”); Interactive Brokers (U.K.) Limited (“IBUK”); Interactive Brokers Ireland Limited (“IBIE”); IBKR Financial Services AG (“IBKRFS”); Interactive Brokers Central Europe Zrt. (“IBCE”); Interactive Brokers (India) Private Limited (“IBI”); Interactive Brokers Hong Kong Limited (“IBHK”); Interactive Brokers Securities Japan, Inc. (“IBSJ”); Interactive Brokers Singapore Private Limited (“IBSG”); and Interactive Brokers Australia Pty Limited (“IBA”). Certain operating subsidiaries are members of various securities and commodities exchanges in North America, Europe and the Asia/Pacific region and are subject to regulatory capital and other requirements (see Note 16). IB LLC, IBKRSS, IBC, IBUK, IBIE, IBCE, IBI, IBHK, IBSJ, IBSG and IBA carry securities accounts for customers or perform custodial functions relating to customer securities.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Significant Accounting Policies [Abstract]
Significant Accounting Policies	2. Significant Accounting Policies Basis of Presentation These consolidated financial statements are presented in U.S. dollars and have been prepared in accordance with accounting principles generally accepted in the U.S. (“U.S. GAAP”) and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding financial reporting with respect to Form 10 - K. These consolidated financial statements include the accounts of the Company and its consolidated subsidiaries and reflect all adjustments of a normal and recurring nature that are, in the opinion of management, necessary for the fair presentation of the results for the periods presented. Principles of Consolidation, including Noncontrolling Interests These consolidated financial statements include the accounts of IBG, Inc. and its majority and wholly-owned subsidiaries. As sole managing member of IBG LLC, IBG, Inc. exerts control over IBG LLC’s operations. In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810, “ Consolidation, ” the Company consolidates IBG LLC’s financial statements and records the interests in IBG LLC that it does not own as noncontrolling interests. The Company’s policy is to consolidate all other entities in which it owns more than 50% unless it does not have control and any potential variable interest entities (“VIEs”) where the Company is deemed to be the primary beneficiary when it has the power to make the decisions that most significantly affect the economic performance of the VIE and has the obligation to absorb significant losses or the right to receive benefits that could potentially be significant to the VIE. As of December 31, 2023, the Company was not the primary beneficiary of any VIEs . All inter - company balances and transactions have been eliminated. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts and disclosures in these consolidated financial statements and accompanying notes. These estimates and assumptions are based on judgment and the best available information at the time. Therefore, actual results could differ materially from those estimates. Such estimates include the allowance for credit losses, valuation of certain investments, compensation accruals, current and deferred income taxes, and contingency reserves. Fair Value Substantially all of the Company’s assets and liabilities, including financial instruments, are carried at fair value based on observable market prices and are marked to market, or are assets and liabilities which are short - term in nature and are carried at amounts that approximate fair value. The Company applies the fair value hierarchy in accordance with FASB ASC Topic 820, “ Fair Value Measurement” (“ASC Topic 820”) , to prioritize the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities and the lowest priority to unobservable inputs. The three levels of the fair value hierarchy are: Level 1 Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2 Quoted prices for similar assets in an active market, quoted prices in markets that are not considered to be active or financial instruments for which all significant inputs are observable, either directly or indirectly. Level 3 Prices or valuations that require inputs that are both significant to fair value measurement and unobservable. Financial instruments owned, at fair value, and financial instruments sold, but not yet purchased, at fair value are generally classified as Level 1 of the fair value hierarchy. The Company’s Level 1 financial instruments, which are valued using quoted market prices as published by exchanges and clearing houses or otherwise broadly distributed in active markets, include active listed stocks, options, warrants and U.S. and foreign government securities. The Company does not adjust quoted prices for financial instruments classified as Level 1 of the fair value hierarchy, even if the Company may hold a large position whereby a purchase or sale could reasonably be expected to impact quoted prices. Currency forward contracts are valued using broadly distributed bank and broker prices and are classified as Level 2 of the fair value hierarchy since inputs to their valuation can generally be corroborated by market data. Precious metals are valued using an internal model, which incorporates the exchange-traded futures price of the underlying instruments, benchmark interest rates and estimated storage costs, and are classified as Level 2 of the fair value hierarchy since the significant inputs to their valuation are observable . Other securities that are not traded in active markets are also classified as Level 2 of the fair value hierarchy. Level 3 financial instruments are comprised of securities that have been delisted or otherwise are no longer tradable in active markets and have been valued by the Company based on internal estimates. Earnings per Share Earnings per share (“EPS”) is computed in accordance with FASB ASC Topic 260, “ Earnings per Share .” Basic EPS is computed by dividing the net income available for common stockholders by the weighted average number of shares outstanding for that period. Diluted EPS is calculated by dividing the net income available for common stockholders by the diluted weighted average shares outstanding for that period. Diluted EPS includes the determinants of basic EPS and, in addition, reflects the dilutive effect of shares of common stock estimated to be distributed in the future under the Company’s stock-based compensation plans, with no adjustments to net income available for common stockholders for potentially dilutive common shares. Current Expected Credit Losses The Company follows FASB ASC Topic 326 – “Financial Instruments – Credit Losses” (“ASC Topic 326”) which applies to financial assets measured at amortized cost, held-to-maturity debt securities and off-balance sheet credit exposures. For on-balance sheet assets, an allowance must be recognized at the origination or purchase of in-scope assets and represents the expected credit losses over the contractual life of those assets. Expected credit losses on off-balance sheet credit exposures must be estimated over the contractual period the Company is exposed to credit risk as a result of a present obligation to extend credit. The impact to the current period is not material since the Company’s in-scope assets are primarily subject to collateral maintenance provisions for which the Company elected to apply the practical expedient of reporting the difference between the fair value of the collateral and the amortized cost for the in-scope assets as the allowance for current expected credit losses. Cash and Cash Equivalents Cash and cash equivalents consist of deposits with banks and all highly liquid investments, with maturities of three months or less, that are not segregated and deposited for regulatory purposes or to meet margin requirements at clearing houses and clearing banks. Cash and Securities - Segregated for Regulatory Purposes As a result of customer activities, certain operating subsidiaries are obligated by rules mandated by their primary regulators to segregate or set aside cash or qualified securities to satisfy such regulations, which have been promulgated to protect customer assets. Restricted cash represents cash and cash equivalents that are subject to withdrawal or usage restrictions. Cash segregated for regulatory purposes meets the definition of restricted cash and is included in “cash, cash equivalents and restricted cash” in the consolidated statements of cash flows. The table below presents the composition of the Company’s securities segregated for regulatory purposes for the periods indicated. December 31, 2023 2022 (in millions) U.S. and foreign government securities $ 5,684 $ 4,641 Municipal securities 70 82 Securities purchased under agreements to resell 1 29,632 27,058 $ 35,386 $ 31,781 ___________________________ (1) These balances are collateralized by U.S. government securities. Securities Borrowed and Securities Loaned Securities borrowed and securities loaned are recorded at the amount of the cash collateral advanced or received. Securities borrowed transactions require the Company to provide counterparties with collateral, which may be in the form of cash, letters of credit or other securities. With respect to securities loaned, the Company receives collateral, which may be in the form of cash or other securities in an amount generally in excess of the fair value of the securities loaned. The Company monitors the market value of securities borrowed and loaned daily, with additional collateral obtained or refunded as permitted contractually. The Company’s policy is to net, in the consolidated statements of financial condition, securities borrowed and securities loaned contracts entered into with the same counterparty that meet the offsetting requirements prescribed in FASB ASC Topic 210-20, “Balance Sheet – Offsetting” (“ASC Topic 210-20”). Securities lending fees received and paid by the Company are included in interest income and interest expense, respectively, in the consolidated statements of comprehensive income. Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase Securities purchased under agreements to resell and securities sold under agreements to repurchase, which are reported as collateralized financing transactions, are recorded at contract value, which approximates fair value. To ensure that the fair value of the underlying collateral remains sufficient, the collateral is valued daily with additional collateral obtained or excess collateral returned, as permitted under contractual provisions. The Company’s policy is to net, in the consolidated statements of financial condition, securities purchased under agreements to resell transactions and securities sold under agreements to repurchase transactions entered into with the same counterparty that meet the offsetting requirements prescribed in ASC Topic 210-20. Financial Instruments Owned and Financial Instruments Sold, But Not Yet Purchased, at Fair Value Financial instrument transactions are accounted for on a trade date basis. Financial instruments owned and financial instruments sold, but not yet purchased are stated at fair value based upon quoted market prices, or if not available, are valued by the Company based on internal estimates (see Fair Value above). The Company’s financial instruments pledged to counterparties where the counterparty has the right, by contract or custom, to sell or repledge the financial instruments are reported as financial instruments owned and pledged as collateral in the consolidated statements of financial condition. Customer Receivables and Payables Receivables from and payables to customers include amounts due on cash and margin transactions, including futures contracts transacted on behalf of customers. Securities owned by customers, including those that collateralize margin loans or other similar transactions, are not reported in the consolidated statements of financial condition. Amounts receivable from customers that are determined by management to be uncollectible are recorded as customer bad debt expense in the consolidated statements of comprehensive income. Receivables from and Payables to Brokers, Dealers and Clearing Organizations Receivables from and payables to brokers, dealers and clearing organizations include net receivables and payables from unsettled trades, including amounts related to futures and options on futures contracts executed on behalf of customers, amounts receivable for securities not delivered by the Company to the purchaser by the settlement date (“fails to deliver”) and cash deposits. Payables to brokers, dealers and clearing organizations also include amounts payable for securities not received by the Company from a seller by the settlement date (“fails to receive”). Investments The Company makes certain strategic investments related to its business which are included in other assets in the consolidated statements of financial condition. The Company accounts for these investments as follows:  Under the equity method of accounting as required under FASB ASC Topic 323, “ Investments - Equity Method and Joint Ventures. ” These investments, including where the investee is a limited partnership or limited liability company, are recorded at the fair value amount of the Company’s initial investment and are adjusted each period for the Company’s share of the investee’s income or loss. Contributions paid to and distributions received from equity method investees are recorded as additions or reductions, respectively, to the respective investment balance.  At fair value, if the investment in equity securities has a readily determinable fair value.  At adjusted cost, if the investment does not have a readily determinable fair value. Adjusted cost represents the historical cost, less impairment if any. If the Company identifies observable price changes in orderly transactions for the identical or a similar investment of the same issuer, the Company measures the equity security at fair value as of the date that the observable transaction occurred in accordance with FASB ASC Topic 321, “Investments in Equity Securities.” A judgmental aspect of accounting for investments is evaluating whether a decline in the value of an investment has occurred. The evaluation of impairment is dependent on specific quantitative and qualitative factors and circumstances surrounding an investment, including recurring operating losses, credit defaults and subsequent rounds of financing. Most of the Company’s equity investments do not have readily determinable market values. All investments are reviewed for changes in circumstances or occurrence of events that suggest the Company’s investment may not be recoverable. An impairment loss, if any, is recognized in the period the determination is made . The table below presents the composition of the Company’s investments for the periods indicated. December 31, 2023 2022 (in millions) Equity method investments 1 $ 142 $ 121 Investments in equity securities at adjusted cost 2 22 16 Investments in equity securities at fair value 2 44 34 Investments in exchange memberships and equity securities of certain exchanges 2 2 2 $ 210 $ 173 ___________________________ (1) The Company’s share of income or losses is included in other income in the consolidated statements of comprehensive income. (2) These investments do not qualify for the equity method of accounting. Dividends received are included in other income in the consolidated statements of comprehensive income. Property, Equipment and Intangible Assets Property, equipment and intangible assets, which are included in other assets in the consolidated statements of financial condition, consist of leasehold improvements, computer equipment, software developed for the Company’s internal use, office furniture and equipment . Property and equipment are recorded at historical cost, less accumulated depreciation and amortization. Additions and improvements that extend the lives of assets are capitalized, while expenditures for repairs and maintenance are expensed as incurred. Depreciation and amortization are computed using the straight - line method. Equipment is depreciated over the estimated useful lives of the assets, while leasehold improvements are amortized over the lesser of the estimated economic useful life of the asset or the term of the lease. Computer equipment is depreciated over three to five years and office furniture and equipment are depreciated over five to seven years . Intangible assets with a finite life are amortized on a straight-line basis over their estimated useful lives of three to five years , and tested for recoverability whenever events indicate that the carrying amounts may not be recoverable. Qualifying costs for internally developed software are capitalized and amortized over the expected useful life of the developed software, not to exceed three years . Upon retirement or disposition of property and equipment, the cost and related accumulated depreciation are removed from the consolidated statements of financial condition and any resulting gain or loss is recorded in other income in the consolidated statements of comprehensive income. Fully depreciated (or amortized) assets are retired periodically throughout the year. Leases The Company reviews all relevant contracts to determine if the contract contains a lease at its inception date. A contract contains a lease if the contract conveys to the company the right to control the use of an underlying asset for a period of time in exchange for consideration. If the Company determines that a contract contains a lease, it recognizes, in the consolidated statements of financial condition, a lease liability and a corresponding right-of-use asset on the commencement date of the lease. The lease liability is initially measured at the present value of the future lease payments over the lease term using the rate implicit in the lease or, if not readily determinable, the Company’s secured incremental borrowing rate. An operating lease right-of-use asset is initially measured at the value of the lease liability minus any lease incentives and initial direct costs incurred plus any prepaid rent. The Company’s leases are classified as operating leases and consist of real estate leases for office space, data centers and other facilities. Each lease liability is measured using the Company’s secured incremental borrowing rate, which is based on an internally developed yield curve using interest rates of third parties’ corporate debt issued with a similar risk profile as the Company and a duration similar to the lease term. The Company’s leases have remaining terms of less than one year to thirteen years , some of which include options to extend the lease term, and some of which include options to terminate the lease upon notice. The Company considers these options when determining the lease term used to calculate the right-of-use asset and the lease liability when the Company is reasonably certain it will exercise such option. The Company’s operating leases contain both lease components and non-lease components . Non-lease components are distinct elements of a contract that are not related to securing the use of the underlying assets, such as common area maintenance and other management costs. The Company elected to measure the lease liability by combining the lease and non-lease components as a single lease component. As such, the Company includes the fixed payments and any payments that depend on a rate or index that relate to the lease and non-lease components in the measurement of the lease liability. Some of the non-lease components are variable and not based on an index or rate, and as a result, are not included in the measurement of the right-of-use asset or lease liability. Operating lease expense is recognized on a straight-line basis over the lease term and is included in occupancy, depreciation and amortization expense in the Company’s consolidated statements of comprehensive income. Crypto-assets safeguarding liability and corresponding safeguarding asset Staff Accounting Bulletin No. 121 (“SAB 121”) requires an entity to recognize a liability to reflect its obligation to safeguard the crypto-assets held for its platform users and a corresponding safeguarding asset on its balance sheet, even when the Company does not control the crypto-assets. Both the crypto-asset safeguarding liability and the corresponding safeguarding asset shall be measured at the fair value of the crypto-assets held for the platform users with the measurement of the safeguarding asset taking into account any potential loss events. The Company has entered into agreements with third-party Cryptocurrency Service Providers (“CSPs”), which provide (i) cryptocurrency exchange platforms and services whereby investors can buy and sell certain cryptocurrencies and (ii) custody services for certain cryptocurrencies, enabling some of our customers to trade and custody Bitcoin (BTC), Ethereum (ETH), Litecoin (LTC), Bitcoin Cash (BCH) and potentially other cryptocurrencies via CSPs. Even though the Company is not responsible for the safeguarding of crypto-assets at the CSPs, its customers’ crypto-assets held at the CSPs are deemed to be in scope of SAB 121. As of December 31, 2023, the fair value of the Company’s customers’ crypto-assets held at the CSPs that the Company recognized on its balance sheet for both the crypto-asset safeguarding liability and the corresponding safeguarding asset, which are included in “accounts payable, accrued expenses and other liabilities” and “other assets,” respectively, in the consolidated statements of financial condition, was $ 172 million ($ 80 million as of December 31, 2022), which consisted of $ 120 million of Bitcoin, $ 50 million of Ethereum and $ 2 million of other crypto-assets. Changes in the fair value of crypto-assets, held by our customers, do not impact our consolidated statements of comprehensive income unless a loss event is identified. As of December 31, 2023, no loss events were identified. Comprehensive Income and Foreign Currency Translation The Company’s operating results are reported in the consolidated statements of comprehensive income pursuant to FASB ASC Topic 220, “ Comprehensive Income. ” Comprehensive income consists of two components: net income and other comprehensive income (“OCI”). The Company’s OCI is comprised of gains and losses resulting from translating foreign currency financial statements of non-U.S. subsidiaries , net of related income taxes, where applicable. In general, the practice and intention of the Company is to reinvest the earnings of its non - U.S. subsidiaries in those operations; therefore, tax is usually not accrued on OCI. The Company’s non - U.S. domiciled subsidiaries have a functional currency that is other than the U.S. dollar. Such subsidiaries’ assets and liabilities are translated into U.S. dollars at period - end exchange rates, and revenues and expenses are translated at average exchange rates prevailing during the period. Adjustments that result from translating amounts from a subsidiary’s functional currency to the U.S. dollar (as described above) are reported net of tax, where applicable, in accumulated OCI in the consolidated statements of financial condition. Revenue Recognition Commissions Commissions earned for executing and/or clearing transactions are accrued on a trade date basis and are reported as commissions in the consolidated statements of comprehensive income. Commissions also include payments for order flow income received from IBKR Lite SM liquidity providers. The Company’s IBKR Lite SM offering provides commission-free trades on U.S. exchange-listed stocks and ETFs and generates no commission revenues from customers on these trades. See Note 8 for further information on revenue from contracts with customers. Other Fees and Services The Company earns fee income on services provided to customers, which includes market data fees, risk exposure fees, payments for order flow from exchange-mandated programs, Insured Bank Deposit Sweep Program fees (“FDIC sweep fees”), minimum activity fees, and other fees and services charged to customers. Fee income is recognized either daily or monthly. See Note 8 for further information on revenue from contracts with customers. Interest Income and Expense The Company earns interest income and incurs interest expense primarily in connection with its electronic brokerage customer business and its securities lending activities, which are recorded on an accrual basis and are included in interest income and interest expense, respectively, in the consolidated statements of comprehensive income. Principal Transactions Principal transactions include gains and losses as a result of changes in the fair value of financial instruments owned, at fair value, financial instruments sold, but not yet purchased, at fair value, and other investments measured at fair value (i.e., unrealized gains and losses) and realized gains and losses related to the Company’s principal transactions. Included are net gains and losses on stocks, options, U.S. and foreign government securities, municipal securities, futures, foreign exchange, precious metals and other derivative instruments, which are reported on a net basis in other income in the consolidated statements of comprehensive income. Dividends are integral to the valuation of stocks. Accordingly, dividend income and expense attributable to financial instruments owned, at fair value and financial instruments sold, but not yet purchased, at fair value, are reported on a net basis in other income in the consolidated statements of comprehensive income. Foreign Currency Gains and Losses Foreign currency balances are assets and liabilities in currencies other than the Company’s functional currency. At every reporting date, the Company revalues its foreign currency balances to its functional currency at the spot exchange rate and records the associated foreign currency gains and losses. These foreign currency gains and losses are reported in the consolidated statements of comprehensive income, as follows: (a) foreign currency gains and losses related to the Company’s currency diversification strategy are reported in other income; (b) foreign currency gains and losses arising from currency swap transactions are reported in interest income or interest expense; and (c) all other foreign currency gains and losses are reported in other income . Rebates Rebates consist of volume discounts, credits, or payments received from exchanges or other market centers related to the placement and/or removal of liquidity from the marketplace and are recorded on an accrual basis. Rebates are recorded net within execution, clearing and distribution fees in the consolidated statements of comprehensive income. Rebates received for trades executed on behalf of customers that elect tiered pricing are passed, in whole or part, to these customers, and such pass-through amounts are recorded net within commissions in the consolidated statements of comprehensive income. Stock - Based Compensation The Company follows FASB ASC Topic 718, “ Compensation - Stock Compensation” (“ASC Topic 718”) , to account for its stock - based compensation plans. ASC Topic 718 requires all share - based payments to employees to be recognized in the consolidated financial statements using a fair value - based method. Grants, which are denominated in U.S. dollars, are communicated to employees in the year of the grant, thereby establishing the fair value of each grant. The fair value of awards granted to employees are generally expensed as follows: 50 % in the year of grant in recognition of the plans’ post-employment provisions (as described below) and the remaining 50 % over the related vesting period utilizing the “graded vesting” method permitted under ASC Topic 718. In the case of “retirement eligible” employees (those employees older than 59), 100 % of awards are expensed when granted. Awards granted under stock - based compensation plans are subject to the plans’ post-employment provisions in the event an employee ceases employment with the Company. The plans provide that employees who discontinue employment with the Company without cause and continue to meet the terms of the plans’ post - employment provisions will be eligible to earn 50 % of previously granted but not yet earned awards, unless the employee is over the age of 59, in which case the employee would be eligible to receive 100 % of previously granted but not yet earned awards. Income Taxes The Company accounts for income taxes in accordance with FASB ASC Topic 740, “ Income Taxes” (“ASC Topic 740”) . The Company’s income tax expense, deferred tax assets and liabilities, and reserves for unrecognized tax benefits are based on enacted tax laws (see Note 11) and reflect management’s best assessment of estimated future taxes to be paid. The Company is subject to income taxes in the U.S. and numerous foreign jurisdictions. Determining income tax expense requires significant judgment and estimates. Deferred income tax assets and liabilities arise from temporary differences between the tax and financial statement recognition of underlying assets and liabilities. In evaluating the ability to recover deferred tax assets within the jurisdictions from which they arise, the Company considers all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax - planning strategies and results of recent operations. In projecting future taxable income, historical results are adjusted for changes in accounting policies and incorporate assumptions including the amount of future state, federal and foreign pre-tax operating income, the reversal of temporary differences, and the implementation of feasible and prudent tax - planning strategies. These assumptions require significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates the Company is using to manage the underlying businesses. In evaluating the objective evidence that historical results provide, three years of cumulative operating income (loss) are considered. Deferred income taxes have not been provided for U.S. tax liabilities or for additional foreign taxes on the unremitted earnings of foreign subsidiaries that have been indefinitely reinvested. The calculation of the Company’s tax liabilities involves dealing with uncertainties in the application of complex tax laws and regulations in a multitude of jurisdictions across the Company’s global operations. Changes in tax laws and rates could also affect recorded deferred tax assets and liabilities in the future. On December 15, 2022, the European Union (“EU”) formally adopted the EU’s Pillar Two Directive, effective January 1, 2024, which provides for a minimum effective tax rate of 15%, as established by the Organization for Economic Cooperation and Development (“OECD”) Pillar Two Framework. A significant number of other countries have either already or are expected to also implement similar legislation with varying effective dates. The Company is continuing to evaluate the potential impact of the EU’s Pillar Two Directive and similar legislations adopted by other countries on its future results of operations, financial condition and cash flows. The Company records tax liabilities in accordance with ASC Topic 740 and adjusts these liabilities when management’s judgment changes as a result of the evaluation of new information not previously available. Because of the complexity of some of these uncertainties, the ultimate resolution may result in payments that are different from the current estimates of these tax liabilities. These differences will be reflected as increases or decreases to income tax expense in the period in which new information becomes available. The Company recognizes a tax benefit from an uncertain tax position only when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, on the basis of the technical merits. A tax position that meets this standard is measured at the largest amount of benefit that will more likely than not be realized on settlement. The Company recognizes interest related to income tax matters as interest income or interest expense and penalties related to income tax matters as income tax expense in the consolidated statements of comprehensive income. Standards Adopted During 2023 Standard Summary of guidance Effect on financial statements Business Combinations (Topic 805) Issued October 2021  Requires companies to recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606, “Revenue from Contracts with Customers”. At the acquisition date, the acquirer should account for the related revenue contracts as if it had originated the contracts.  Effective date: January 1, 2023.  The changes did not have a material impact on

Trading Activities And Related

Trading Activities And Related Risks	12 Months Ended
	Dec. 31, 2023
Trading Activities And Related Risks [Abstract]
Trading Activities And Related Risks	3. Trading Activities and Related Risks Trading activities expose the Company to market and credit risks. These risks are managed in accordance with established risk management policies and procedures. To accomplish this, management has established a risk management process that includes: • a regular review of the risk management process by executive management as part of its oversight role; • defined risk management policies and procedures supported by a rigorous analytic framework; and • articulated risk tolerance levels as defined by executive management that are regularly reviewed to ensure that the Company’s risk - taking is consistent with its business strategy, its capital structure, and current and anticipated market conditions. Market Risk The Company is exposed to various market risks. Exposures to market risks arise from equity price risk, foreign currency exchange rate fluctuations and changes in interest rates. The Company seeks to mitigate market risk associated with trading inventories by employing hedging strategies that correlate rate, price and spread movements of trading inventories and related financing and hedging activities. The Company uses a combination of cash instruments and exchange-traded derivatives to hedge its market exposures. The Company does not apply hedge accounting. The following discussion describes the types of market risk faced: Equity Price Risk Equity price risk arises from the possibility that equity security prices will fluctuate, affecting the value of equity securities and other instruments that derive their value from a particular stock, a defined basket of stocks, or a stock index. The Company is subject to equity price risk primarily in financial instruments owned, at fair value and financial instruments sold, but not yet purchased, at fair value. The Company attempts to limit such risks by continuously reevaluating prices and by diversifying its portfolio across many different options, futures and underlying securities and avoiding concentrations of positions based on the same underlying security. Interest Rate Risk Interest rate risk arises from the possibility that changes in interest rates will affect the value of financial instruments. The Company is exposed to interest rate risk on cash and margin balances, positions carried in equity and fixed income securities, options, futures and on its borrowings. These risks are managed through investment policies and by entering into interest rate futures contracts. Currency Risk Currency risk arises from the possibility that fluctuations in foreign exchange rates will impact the value of financial instruments. The Company manages this risk using spot (i.e., cash) currency transactions, currency futures contracts and currency forward contracts. The Company actively manages its currency exposure using a currency diversification strategy that is based on a defined basket of ten currencies internally referred to as the “GLOBAL.” These strategies minimize the fluctuation of the Company’s equity as expressed in GLOBALs, thereby diversifying its risk in alignment with these global currencies, weighted by the Company’s view of their importance. As the Company’s financial results are reported in U.S. dollars, the change in the value of the GLOBAL as expressed in U.S. dollars affects the Company’s earnings. The impact of this currency diversification strategy in the Company’s earnings is included in other income in the consolidated statements of comprehensive income. Credit Risk The Company is exposed to the risk of loss if a customer, counterparty or issuer fails to perform its obligations under contractual terms (“default risk”). Both cash instruments and derivatives expose the Company to default risk. The Company has established policies and procedures for mitigating credit risk on principal transactions, including reviewing and establishing limits for credit exposure, maintaining collateral and continually assessing the creditworthiness of counterparties. The Company’s credit risk is limited as contracts entered into are settled directly at securities and commodities clearing houses or are settled through member firms and banks with substantial financial and operational resources. Over-the-counter transactions, such as securities lending and contracts for differences (“CFDs”), are marked to market daily and are conducted with counterparties that have undergone a thorough credit review. The Company seeks to control the risks associated with its customer margin activities by requiring customers to maintain collateral in compliance with regulatory and internal guidelines. In the normal course of business, the Company executes, settles and finances various customer securities transactions. Execution of these transactions includes the purchase and sale of securities which exposes the Company to default risk arising from the potential that customers or counterparties may fail to satisfy their obligations. In these situations, the Company may be required to purchase or sell financial instruments at unfavorable market prices to satisfy obligations to customers or counterparties. Liabilities to other brokers and dealers related to unsettled transactions (i.e., securities fails to receive) are recorded at the amount for which the securities were purchased, and are paid upon receipt of the securities from other brokers or dealers. In the case of aged securities fails to receive, the Company may purchase the underlying security in the market and seek reimbursement for any losses from the counterparty. For cash management purposes, the Company enters into short - term securities purchased under agreements to resell and securities sold under agreements to repurchase transactions (“repos”) in addition to securities borrowing and lending arrangements, all of which may result in credit exposure in the event the counterparty to a transaction is unable to fulfill its contractual obligations. Repos are collateralized by securities with a market value in excess of the obligation under the contract. Similarly, securities lending agreements are collateralized by deposits of cash or securities. The Company attempts to minimize credit risk associated with these activities by monitoring collateral values daily and requiring additional collateral to be deposited with or returned to the Company as permitted under contractual provisions. Concentrations of Credit Risk The Company’s exposure to credit risk associated with its trading and other activities is measured on an individual counterparty basis, as well as by groups of counterparties that share similar attributes. Concentrations of credit risk can be affected by changes in political, industry, or economic factors. To reduce the potential for risk concentration, credit limits are established and exposure is monitored in light of changing counterparty and market conditions. As of December 31, 2023, the Company did not have any material concentrations of credit risk outside the ordinary course of business. Off - Balance Sheet Risks The Company may be exposed to a risk of loss not reflected in the consolidated financial statements to settle futures and certain over - the - counter contracts at contracted prices, which may require repurchase or sale of the underlying products in the market at prevailing prices. Accordingly, these transactions result in off - balance sheet risk as the Company’s cost to liquidate such contracts may exceed the amounts reported in the Company’s consolidated statements of financial condition.

Equity And Earnings Per Share

Equity And Earnings Per Share	12 Months Ended
	Dec. 31, 2023
Equity And Earnings Per Share [Abstract]
Equity And Earnings Per Share	4. Equity and Earnings per Share In connection with IBG, Inc.’s initial public offering of Class A common stock (“IPO”) in May 2007, it purchased 10.0 % of the membership interests in IBG LLC from IBG Holdings LLC (“Holdings”), became the sole managing member of IBG LLC and began to consolidate IBG LLC’s financial results into its financial statements. Holdings owns all of IBG, Inc.’s Class B common stock, which has voting rights in proportion to its ownership interests in IBG LLC . The table below presents the amount of IBG LLC membership interests held by IBG, Inc. and Holdings as of December 31 , 2023. IBG, Inc. Holdings Total Ownership % 25.4 % 74.6 % 100.0 % Membership interests 107,049,483 313,976,354 421,025,837 These consolidated financial statements reflect the results of operations and financial position of IBG, Inc., including consolidation of its investment in IBG LLC and its subsidiaries. The noncontrolling interests in IBG LLC attributable to Holdings are reported as a component of total equity in the consolidated statements of financial condition. Recapitalization and Post - IPO Capital Structure Immediately before and immediately following the consummation of the IPO, IBG, Inc., Holdings, IBG LLC and the members of IBG LLC consummated a series of transactions collectively referred to herein as the “Recapitalization.” In connection with the Recapitalization, IBG, Inc., Holdings and the historical members of IBG LLC entered into an exchange agreement, dated as of May 3, 2007 (the “Exchange Agreement”), under which the historical members of IBG LLC received membership interests in Holdings in exchange for their membership interests in IBG LLC. Additionally, IBG, Inc. became the sole managing member of IBG LLC. In connection with the consummation of the IPO, Holdings used the net proceeds to redeem 10.0 % of members’ interests in Holdings in proportion to their interests. Immediately following the Recapitalization and IPO, Holdings owned approximately 90 % of IBG LLC and 100 % of IBG, Inc.’s Class B common stock. Since the consummation of the IPO and Recapitalization, IBG, Inc.’s equity capital structure has been comprised of Class A and Class B common stock. All shares of common stock have a par value of $ 0.01 per share and have identical rights to earnings and dividends and in liquidation. As of December 31 , 2023 and 2022, 1,000,000,000 shares of Class A common stock were authorized, of which 107,178,928 and 103,057,148 shares have been issued; and 107,045,894 and 102,887,728 shares were outstanding, respectively. Class B common stock is comprised of 100 authorized shares, of which 100 shares were issued and outstanding as of December 31 , 2023 and 2022. In addition, 10,000 shares of preferred stock have been authorized, of which no shares are issued or outstanding as of December 31 , 2023 and 2022. As a result of a federal income tax election made by IBG LLC applicable to the acquisition of IBG LLC member interests by IBG, Inc., the income tax basis of the assets of IBG LLC acquired by IBG, Inc. have been adjusted based on the amount paid for such interests. Deferred tax assets were recorded as of the IPO date and in connection with subsequent redemptions of Holdings member interests in exchange for common stock. These deferred tax assets are included in other assets in the Company’s consolidated statements of financial condition and are being amortized as additional deferred income tax expense over 15 years from the IPO date and from the additional redemption dates, respectively, as allowable under current tax law. As of December 31 , 2023 and 2022, the unamortized balance of these deferred tax assets was $ 197 million and $ 193 million, respectively. IBG, Inc. also entered into an agreement (the “Tax Receivable Agreement”) with Holdings to pay Holdings (for the benefit of the former members of IBG LLC) 85 % of the tax savings that IBG, Inc. actually realizes as the result of tax basis increases. These payables to Holdings are reported as payable to affiliate in the Company’s consolidated statements of financial condition. The remaining 15 % is accounted for as a permanent increase to additional paid - in capital in the Company’s consolidated statements of financial condition. The cumulative amounts of deferred tax assets, payables to Holdings and additional paid - in capital arising from stock offerings from the date of the IPO through December 31 , 2023 were $ 682 million, $ 580 million and $ 102 million, respectively. Amounts payable under the Tax Receivable Agreement are payable to Holdings annually following the filing of IBG, Inc.’s federal income tax return. The Company has paid Holdings a cumulative total of $ 268 million through December 31 , 2023 under the terms of the Tax Receivable Agreement. The Exchange Agreement, as amended, provides for future redemptions of member interests and for the purchase of member interests in IBG LLC by IBG, Inc. from Holdings, which could result in IBG, Inc. acquiring the remaining member interests in IBG LLC that it does not own. On an annual basis, members of Holdings can request redemption of their interests. At the time of IBG, Inc.’s IPO in 2007, three hundred sixty ( 360 ) million shares of authorized common stock were reserved for future sales and redemptions. From 2008 through 2010, Holdings redeemed 5,013,259 IBG LLC interests with a total value of $ 114 million, which redemptions were funded using cash on hand at IBG LLC. Upon cash redemption, these IBG LLC interests were retired. From 2011 through 2022, IBG, Inc. issued 37,478,697 shares of common stock (with a fair value of $ 1.7 billion) directly to Holdings in exchange for an equivalent number of member interests in IBG LLC. On July 27, 2023, the Company filed a Prospectus Supplement on Form 424B5 (File Number 333-273451) with the SEC to issue 2,632,748 shares of common stock (with a fair value of $ 229 million) in exchange for an equivalent number of shares of member interests in IBG LLC. On July 26, 2023, the Company filed a Prospectus Supplement on Form 424B (File Number 333-273451) with the SEC to re-register up to 630,000 shares of common stock, offering the opportunity for eligible persons to receive awards in the form of an offer to receive such shares by participating in one or more promotions that are designed to attract new customers to the Company’s brokerage platform, increase assets held with the Company’s brokerage business and enhance customer loyalty. From 2019 through 2023, the Company issued 420,000 shares and an additional 50,000 shares in January 2024 to IBG LLC for distribution to eligible customers of certain of its subsidiaries. As a consequence of these redemption transactions and distribution of shares to employees (see Note 10), IBG, Inc.’s interest in IBG LLC has increased to approximately 25.4 %, with Holdings owning the remaining 74.6 % as of December 31 , 2023. The redemptions also increased the Holdings interest held by Mr. Thomas Peterffy and his affiliates from approximately 84.6 % at the IPO to approximately 91.3 % as of December 31 , 2023. Earnings per Share Basic earnings per share is calculated utilizing net income available for common stockholders divided by the weighted average number of shares of Class A and Class B common stock outstanding for that period. Year-Ended December 31, 2023 2022 2021 (in millions, except share or per share amounts) Basic earnings per share Net income available for common stockholders $ 600 $ 380 $ 308 Weighted average shares of common stock outstanding Class A 104,964,950 100,459,916 94,167,472 Class B 100 100 100 104,965,050 100,460,016 94,167,572 Basic earnings per share $ 5.72 $ 3.78 $ 3.27 Diluted earnings per share are calculated utilizing the Company’s basic net income available for common stockholders divided by diluted weighted average shares outstanding with no adjustments to net income available to common stockholders for potentially dilutive common shares. Year-Ended December 31, 2023 2022 2021 (in millions, except share or per share amounts) Diluted earnings per share Net income available for common stockholders $ 600 $ 380 $ 308 Weighted average shares of common stock outstanding Class A Issued and outstanding 104,964,950 100,459,916 94,167,472 Potentially dilutive common shares Issuable pursuant to employee stock incentive plans 881,827 839,593 842,308 Class B 100 100 100 105,846,877 101,299,609 95,009,880 Diluted earnings per share $ 5.67 $ 3.75 $ 3.24 Member Distributions and Stockholder Dividends During the three years ended December 31 , 2023, 2022, and 2021, IBG LLC made distributions totaling $ 741 million, $ 533 million and $ 489 million to its members, of which IBG, Inc.’s proportionate share was $ 185 million, $ 128 million and $ 112 million, respectively. The Company paid quarterly cash dividends of $ 0.10 per share of common stock, totaling $ 42 million, $ 40 million and $ 38 million during 2023, 2022, and 2021, respectively. On January 16, 2024 , the Company declared a cash dividend of $ 0.10 per common share, payable on March 14, 2024 to stockholders of record as of March 1, 2024 .

Comprehensive Income

Comprehensive Income	12 Months Ended
	Dec. 31, 2023
Comprehensive Income Detail [Abstract]
Comprehensive Income	5. Comprehensive Income The table below presents comprehensive income and earnings per share on comprehensive income for the periods indicated. Year-Ended December 31, 2023 2022 2021 (in millions, except share or per share amounts) Comprehensive income available for common stockholders $ 630 $ 354 $ 286 Earnings per share on comprehensive income Basic $ 6.00 $ 3.53 $ 3.04 Diluted $ 5.95 $ 3.50 $ 3.01 Weighted average common shares outstanding Basic 104,965,050 100,460,016 94,167,572 Diluted 105,846,877 101,299,609 95,009,880

Financial Assets And Financial

Financial Assets And Financial Liabilities	12 Months Ended
	Dec. 31, 2023
Financial Assets And Financial Liabilities [Abstract]
Financial Assets And Financial Liabilities	6. Financial Assets and Financial Liabilities Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis The tables below present, by level within the fair value hierarchy (see Note 2), financial assets and liabilities, measured at fair value on a recurring basis for the periods indicated. As required by ASC Topic 820, financial assets and financial liabilities are classified in their entirety based on the lowest level of input that is significant to the respective fair value measurement. Financial Assets at Fair Value as of December 31, 2023 Level 1 Level 2 Level 3 Total (in millions) Securities segregated for regulatory purposes U.S. and foreign government securities $ 5,684 $ — $ — $ 5,684 Municipal securities — 70 — 70 Total securities segregated for regulatory purposes 5,684 70 — 5,754 Financial instruments owned, at fair value Stocks 1,023 — — 1,023 Options 354 — — 354 U.S. and foreign government securities 39 — — 39 Precious metals — 12 — 12 Currency forward contracts — 60 — 60 Total financial instruments owned, at fair value 1,416 72 — 1,488 Other assets Customer-held fractional shares 144 — — 144 Crypto-asset safeguarding asset — 172 — 172 Other investments in equity securities 44 — — 44 Total other assets 188 172 — 360 Total financial assets at fair value $ 7,288 $ 314 $ — $ 7,602 Financial Liabilities at Fair Value as of December 31, 2023 Level 1 Level 2 Level 3 Total (in millions) Financial instruments sold, but not yet purchased, at fair value Stocks $ 77 $ — $ — $ 77 Options 104 — — 104 Precious metals — 7 — 7 Currency forward contracts — 5 — 5 Total financial instruments sold, but not yet purchased, at fair value 181 12 — 193 Accounts payable, accrued expenses and other liabilities Fractional shares repurchase obligation 144 — — 144 Crypto-asset safeguarding liability — 172 — 172 Total accounts payable, accrued expenses and other liabilities 144 172 — 316 Total financial liabilities at fair value $ 325 $ 184 $ — $ 509 Financial Assets at Fair Value as of December 31, 2022 Level 1 Level 2 Level 3 Total (in millions) Securities segregated for regulatory purposes U.S. and foreign government securities $ 4,641 $ — $ — $ 4,641 Municipal securities — 82 — 82 Total securities segregated for regulatory purposes 4,641 82 — 4,723 Financial instruments owned, at fair value Stocks 380 — — 380 Options 31 — — 31 U.S. and foreign government securities 35 — — 35 Precious metals — 9 — 9 Currency forward contracts — 30 — 30 Total financial instruments owned, at fair value 446 39 — 485 Other assets Customer-held fractional shares 91 — — 91 Crypto-asset safeguarding asset — 80 — 80 Other investments in equity securities 34 — — 34 Total other assets 125 80 — 205 Total financial assets at fair value $ 5,212 $ 201 $ — $ 5,413 Financial Liabilities at Fair Value as of December 31, 2022 Level 1 Level 2 Level 3 Total (in millions) Financial instruments sold, but not yet purchased, at fair value Stocks $ 121 $ — $ — $ 121 Options 16 — — 16 Precious metals — 7 — 7 Currency forward contracts — 2 — 2 Total financial instruments sold, but not yet purchased, at fair value 137 9 — 146 Accounts payable, accrued expenses and other liabilities Fractional shares repurchase obligation 91 — — 91 Crypto-asset safeguarding liability — 80 — 80 Total accounts payable, accrued expenses and other liabilities 91 80 — 171 Total financial liabilities at fair value $ 228 $ 89 $ — $ 317 Level 3 Financial Assets and Financial Liabilities There were no transfers in or out of level 3 for the year ended December 31, 2023. Financial Assets and Liabilities Not Measured at Fair Value Financial assets and liabilities not measured at fair value are recorded at carrying value, which approximates fair value due to their short-term nature. The tables below represent the carrying value, fair value and fair value hierarchy category of certain financial assets and liabilities that are not recorded at fair value in the Company's consolidated statements of financial condition for the periods indicated. The tables below exclude certain financial instruments such as equity method investments and all non-financial assets and liabilities. December 31, 2023 Carrying Value Fair Value Level 1 Level 2 Level 3 (in millions) Financial assets, not measured at fair value Cash and cash equivalents $ 3,753 $ 3,753 $ 3,753 $ — $ — Cash - segregated for regulatory purposes 28,840 28,840 28,840 — — Securities - segregated for regulatory purposes 29,632 29,632 — 29,632 — Securities borrowed 5,835 5,835 — 5,835 — Securities purchased under agreements to resell 5,504 5,504 — 5,504 — Receivables from customers 44,472 44,472 — 44,472 — Receivables from brokers, dealers and clearing organizations 1,643 1,643 — 1,643 — Interest receivable 375 375 — 375 — Other assets 22 23 — 2 21 Total financial assets, not measured at fair value $ 120,076 $ 120,077 $ 32,593 $ 87,463 $ 21 Financial liabilities, not measured at fair value Short-term borrowings $ 17 $ 17 $ — $ 17 $ — Securities loaned 11,347 11,347 — 11,347 — Payables to customers 101,012 101,012 — 101,012 — Payables to brokers, dealers and clearing organizations 590 590 — 590 — Interest payable 311 311 — 311 — Total financial liabilities, not measured at fair value $ 113,277 $ 113,277 $ — $ 113,277 $ — December 31, 2022 Carrying Value Fair Value Level 1 Level 2 Level 3 (in millions) Financial assets, not measured at fair value Cash and cash equivalents $ 3,436 $ 3,436 $ 3,436 $ — $ — Cash - segregated for regulatory purposes 25,167 25,167 25,167 — — Securities - segregated for regulatory purposes 27,058 27,058 — 27,058 — Securities borrowed 4,749 4,749 — 4,749 — Securities purchased under agreements to resell 6,029 6,029 — 6,029 — Receivables from customers 38,760 38,760 — 38,760 — Receivables from brokers, dealers and clearing organizations 3,469 3,469 — 3,469 — Interest receivable 341 341 — 341 — Other assets 17 18 — 2 16 Total financial assets, not measured at fair value $ 109,026 $ 109,027 $ 28,603 $ 80,408 $ 16 Financial liabilities, not measured at fair value Short-term borrowings $ 18 $ 18 $ — $ 18 $ — Securities loaned 8,940 8,940 — 8,940 — Payables to customers 93,195 93,195 — 93,195 — Payables to brokers, dealers and clearing organizations 291 291 — 291 — Interest payable 193 193 — 193 — Total financial liabilities, not measured at fair value $ 102,637 $ 102,637 $ — $ 102,637 $ — Netting of Financial Assets and Financial Liabilities The Company’s policy is to net securities borrowed and securities loaned, and securities purchased under agreements to resell and securities sold under agreements to repurchase that meet the offsetting requirements prescribed in ASC Topic 210-20. In the tables below, the amounts of financial instruments that are not offset in the consolidated statements of financial condition, but could be netted against cash or financial instruments with specific counterparties under master netting agreements, according to the terms of the agreements, including clearing houses (exchange-traded options, warrants and discount certificates) or over the counter currency forward contract counterparties, are presented to provide financial statement readers with the Company’s net payable or receivable with counterparties for these financial instruments. The tables below present the netting of financial assets and financial liabilities for the periods indicated . December 31, 2023 Gross Amounts Net Amounts Amounts Not Amounts Offset in the Presented in the Offset in the of Financial Consolidated Consolidated Consolidated Statement Assets and Statement of Statement of of Financial Condition Liabilities Financial Financial Cash or Financial Net Recognized Condition 2 Condition Instruments Amount (in millions) Offsetting of financial assets Securities segregated for regulatory purposes - purchased under agreements to resell $ 29,632 1 $ — $ 29,632 $ ( 29,632 ) $ — Securities borrowed 5,835 — 5,835 ( 5,618 ) 217 Securities purchased under agreements to resell 5,504 — 5,504 ( 5,504 ) — Financial instruments owned, at fair value Options 354 — 354 ( 104 ) 250 Currency forward contracts 60 — 60 — 60 Total $ 41,385 $ — $ 41,385 $ ( 40,858 ) $ 527 (in millions) Offsetting of financial liabilities Securities loaned $ 11,347 $ — $ 11,347 $ ( 10,443 ) $ 904 Financial instruments sold, but not yet purchased, at fair value Options 104 — 104 ( 104 ) — Currency forward contracts 5 — 5 — 5 Total $ 11,456 $ — $ 11,456 $ ( 10,547 ) $ 909 December 31, 2022 Gross Amounts Net Amounts Amounts Not Amounts Offset in the Presented in the Offset in the of Financial Consolidated Consolidated Consolidated Statement Assets and Statement of Statement of of Financial Condition Liabilities Financial Financial Cash or Financial Net Recognized Condition 2 Condition Instruments Amount (in millions) Offsetting of financial assets Securities segregated for regulatory purposes - purchased under agreements to resell $ 27,058 1 $ — $ 27,058 $ ( 27,058 ) $ — Securities borrowed 4,749 — 4,749 ( 4,597 ) 152 Securities purchased under agreements to resell 6,029 — 6,029 ( 6,029 ) — Financial instruments owned, at fair value Options 31 — 31 ( 16 ) 15 Currency forward contracts 30 — 30 — 30 Total $ 37,897 $ — $ 37,897 $ ( 37,700 ) $ 197 (in millions) Offsetting of financial liabilities Securities loaned $ 8,940 $ — $ 8,940 $ ( 8,260 ) $ 680 Financial instruments sold, but not yet purchased, at fair value Options 16 — 16 ( 16 ) — Currency forward contracts 2 — 2 — 2 Total $ 8,958 $ — $ 8,958 $ ( 8,276 ) $ 682 ___________________________ (1) As of December 31 , 2023 and 2022, the Company had $ 29.6 billion and $ 27.1 billion, respectively, of securities purchased under agreements to resell that were segregated to satisfy regulatory requirements. These securities are included in “Securities - segregated for regulatory purposes” in the consolidated statements of financial condition. (2) The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at December 31, 2023 and 2022. Secured Financing Transactions – Maturities and Collateral Pledged The tables below present gross obligations for securities loaned transactions by remaining contractual maturity and class of collateral pledged for the periods indicated. December 31, 2023 Remaining Contractual Maturity Overnight Less than 30 – 90 Over 90 and Open 30 days days days Total (in millions) Securities loaned Stocks $ 11,306 $ — $ — $ — $ 11,306 Corporate bonds 41 — — — 41 Foreign government securities — — — — — Total securities loaned $ 11,347 $ — $ — $ — $ 11,347 December 31, 2022 Remaining Contractual Maturity Overnight Less than 30 – 90 Over 90 and Open 30 days days days Total (in millions) Securities loaned Stocks $ 8,837 $ — $ — $ — $ 8,837 Corporate bonds 101 — — — 101 Foreign government securities 2 — — — 2 Total securities loaned $ 8,940 $ — $ — $ — $ 8,940

Collateralized Transactions

Collateralized Transactions	12 Months Ended
	Dec. 31, 2023
Disclosure Collateralized Transactions [Abstract]
Collateralized Transactions	7. Collateralized Transactions The Company enters into securities borrowing and lending transactions and agreements to repurchase and resell securities to finance trading inventory, to obtain securities for settlement and to earn residual interest rate spreads. In addition, the Company’s customers pledge their securities owned to collateralize margin loans. Under these transactions, the Company either receives or provides collateral, including equity, corporate debt and U.S. government securities. Under typical agreements, the Company is permitted to sell or repledge securities received as collateral and use these securities to secure securities purchased under agreements to resell, enter into securities lending transactions or deliver these securities to counterparties to cover short positions. The Company also engages in securities financing transactions with and for customers through margin lending. Customer receivables generated from margin lending activity are collateralized by customer - owned securities held by the Company. Customers’ required margin levels and established credit limits are monitored continuously by risk management staff using automated systems. Pursuant to the Company’s policy and as enforced by such systems, customers are required to deposit additional collateral or reduce positions, when necessary, to avoid automatic liquidation of their positions. Margin loans are extended to customers on a demand basis and are not committed facilities. Factors considered in the acceptance or rejection of margin loans are the amount of the loan, the degree of leverage being employed in the customer account and an overall evaluation of the customer’s portfolio to ensure proper diversification or, in the case of concentrated positions, appropriate liquidity of the underlying collateral. Additionally, transactions relating to concentrated or restricted positions are limited or prohibited by raising the level of required margin collateral (to 100% in the extreme case). The underlying collateral for margin loans is evaluated with respect to the liquidity of the collateral positions, valuation of securities, volatility analysis and an evaluation of industry concentrations. Adherence to the Company’s collateral policies significantly limits the Company’s credit exposure to margin loans in the event of a customer’s default. Under margin lending agreements, the Company may request additional margin collateral from customers and may sell securities that have not been paid for or purchase securities sold but not delivered from customers, if necessary. As of December 31 , 2023 and 2022, approximately $ 44.5 billion and $ 38.8 billion, respectively, of customer margin loans were outstanding. The table below presents a summary of the amounts related to collateralized transactions for the periods indicated . December 31, 2023 December 31, 2022 Permitted Sold or Permitted Sold or to Repledge Repledged to Repledge Repledged (in millions) Securities lending transactions $ 97,210 $ 8,437 $ 62,689 $ 7,055 Securities purchased under agreements to resell transactions 1 35,198 34,825 33,208 31,108 Customer margin assets 54,847 17,234 42,222 17,008 $ 187,255 $ 60,496 $ 138,119 $ 55,171 ___________________________ (1) As of December 31 , 2023, $ 29.6 billion or 85 % (as of December 31, 2022, $ 27.1 billion or 87 %) of securities purchased under agreements to resell were segregated to satisfy regulatory requirements and are included in “Securities - segregated for regulatory purposes” in the consolidated statements of financial condition. In the normal course of business, the Company pledges qualified securities with clearing organizations to satisfy daily margin and clearing fund requirements. As of December 31, 2023 and 2022, the majority of the Company’s U.S. and foreign government securities owned were pledged to clearing organizations. The table below presents financial instruments owned and pledged as collateral, including amounts pledged to affiliates, where the counterparty has the right to repledge, for the periods indicated . December 31, 2023 2022 (in millions) Stocks $ 28 $ 54 U.S. and foreign government securities 38 35 $ 66 $ 89

Revenue From Contracts With Cus

Revenue From Contracts With Customers	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenues From Contracts With Customers	8. Revenues from Contracts with Customers Revenue from contracts with customers is recognized when, or as, the Company satisfies its performance obligations by transferring the promised services to the customers. A service is transferred to a customer when, or as, the customer obtains control of that service. A performance obligation may be satisfied at a point in time or over time. Revenue from a performance obligation satisfied at a point in time is recognized at the point in time that the Company determines the customer obtains control over the promised service. Revenue from a performance obligation satisfied over time is recognized by measuring the Company’s progress in satisfying the performance obligation in a manner that depicts the transfer of the services to the customer. The amount of revenue recognized reflects the consideration the Company expects to receive in exchange for those promised services ( i.e. , the “transaction price”). In determining the transaction price, the Company considers multiple factors, including the effects of variable consideration, if any. The Company’s revenues from contracts with customers are recognized when the performance obligations are satisfied at an amount that reflects the consideration expected to be received in exchange for such services. The majority of the Company’s performance obligations are satisfied at a point in time and are typically collected from customers by debiting their brokerage account with the Company. Nature of Services The Company’s main sources of revenues from contracts with customers are as follows:  Commissions are charged to customers for order execution services and trade clearing and settlement services. These services represent a single performance obligation as the services are not separately identifiable in the context of the contract. The Company recognizes revenue at a point in time at the execution of the order (i.e., trade date). Commissions are generally collected from cleared customers on trade date and from non-cleared customers monthly. Commissions also include payments for order flow received from IBKR Lite SM liquidity providers.  Market data fees are charged to customers for market data services to which they subscribe that the Company delivers. The Company recognizes revenue monthly as the performance obligation is satisfied over time by continually providing market data for the period. Market data fees are collected monthly, generally in advance.  Risk exposure fees are charged to customers who carry positions with a market risk that exceeds defined thresholds. The Company recognizes revenue daily as the performance obligation is satisfied at a point in time by the Company taking on the additional risk of account liquidation and potential losses due to insufficient margin. Risk exposure fees are collected daily.  Payments for order flow are earned from various options exchanges based upon options trading volume originated by the Company that meets certain criteria. The Company recognizes revenue daily as the performance obligation is satisfied at a point in time on customer orders that qualify for payments subject to exchange-mandated programs. Payments for order flow are collected monthly, in arrears.  FDIC sweep fees are earned from the banks that participate in the Company’s Insured Bank Deposit Sweep Program with respect to the Company’s customers’ funds deposited with each participating bank. The Company recognizes revenue daily as the performance obligation is satisfied when customer funds are swept to their FDIC insured accounts with the participating banks.  Minimum activity fees are charged to customers that do not generate the required minimum monthly commission. The Company recognizes revenue monthly as the performance obligation is satisfied at a point in time by servicing customer accounts that do not generate the required minimum monthly commissions. Minimum activity fees are collected monthly, in arrears. Effective July 1, 2021, the Company eliminated minimum activity fees for most account types. The Company also earns revenues from other services, including order cancelation or modification fees, position transfer fees, telecommunications fees, and withdrawal fees, among others. Disaggregation of Revenue The tables below present revenue from contracts with customers by geographic location and major types of services for the periods indicated. Year-Ended December 31, 2023 2022 2021 (in millions) Geographic location 1 United States $ 968 $ 931 $ 951 International 589 575 617 $ 1,557 $ 1,506 $ 1,568 Major types of services Commissions $ 1,360 $ 1,322 $ 1,350 Market data fees 2 70 76 78 Risk exposure fees 2 46 33 38 Payments for order flow 2 31 37 40 FDIC sweep fees 2 19 10 6 Minimum activity fees 2 4 3 18 Other 2 27 25 38 $ 1,557 $ 1,506 $ 1,568 ___________________________ (1) Based on the location of the subsidiaries in which the revenues are recorded. (2) Included in other fees and services in the consolidated statements of comprehensive income. Receivables and Contract Balances Receivables arise when the Company has an unconditional right to receive payment under a contract with a customer and are derecognized when the cash is received. Receivables of $ 26 million and $ 17 million, as of December 31, 2023 and 2022, respectively, are reported in other assets in the consolidated statements of financial condition. Contract assets arise when the revenue associated with the contract is recognized before the Company’s unconditional right to receive payment under a contract with a customer (i.e., unbilled receivable) and are derecognized when either it becomes a receivable or the cash is received. Contract assets, if any, are reported in other assets in the consolidated statements of financial condition. As of December 31 , 2023 and 2022, there were no contract asset balances outstanding. Contract liabilities arise when customers remit contractual cash payments in advance of the Company satisfying its performance obligations under the contract and are derecognized when the revenue associated with the contract is recognized either when a milestone is met triggering the contractual right to bill the customer or when the performance obligation is satisfied. Contract liabilities, if any, are reported in accounts payable, accrued expenses and other liabilities in the consolidated statements of financial condition. As of December 31 , 2023 and 2022, there were no contract liability balances outstanding.

Other Income (Loss)

Other Income (Loss)	12 Months Ended
	Dec. 31, 2023
Other Income (Loss) [Abstract]
Other Income (Loss)	9. Other Income (Loss) The table below presents the components of other income (loss) for the periods indicated. Year-Ended December 31, 2023 2022 2021 (in millions) Principal transactions $ 48 $ ( 16 ) $ 22 Gains (losses) from currency diversification strategy, net ( 80 ) ( 100 ) ( 37 ) Other, net 21 9 13 $ ( 11 ) $ ( 107 ) $ ( 2 ) ___________________________ Principal transactions include (1) trading gains and losses from the Company’s remaining market making activities; (2) realized and unrealized gains and losses on financial instruments that (a) are held for purposes other than the Company’s market making activities, or (b) are subject to restrictions; and (3) dividends on investments accounted at cost less impairment.

Employee Incentive Plans

Employee Incentive Plans	12 Months Ended
	Dec. 31, 2023
Employee Incentive Plans [Abstract]
Employee Incentive Plans	10. Employee Incentive Plans Defined Contribution Plan The Company offers substantially all employees of U.S.-based operating subsidiaries who have met minimum service requirements the opportunity to participate in defined contribution retirement plans qualifying under the provisions of Section 401(k) of the Internal Revenue Code. The general purpose of this plan is to provide employees with an incentive to make regular savings in order to provide additional financial security during retirement. This plan provides for the Company to match 50 % of the employees’ pre-tax contribution, up to a maximum of 10 % of eligible earnings. The employee is vested in the matching contribution incrementally over six years of service. Included in employee compensation and benefits expenses in the consolidated statements of comprehensive income were $ 7 million, $ 6 million and $ 5 million of plan contributions for the years ended December 31, 2023, 2022, and 2021, respectively. 2007 Stock Incentive Plan On February 28, 2023, the Company amended the 2007 Stock Incentive Plan to increase the number of shares of Class A common stock authorized and reserved for issuance from 30 million to 40 million, which was approved by the Company’s stockholders at its 2023 Annual Meeting held on April 20, 2023, and the shares were registered with the SEC on July 27, 2023. Under the Company’s Stock Incentive Plan, up to 40 million shares of the Company’s Class A common stock may be issued to satisfy vested restricted stock units granted to directors, officers, employees, contractors and consultants of the Company. The purpose of the Stock Incentive Plan is to promote the Company’s long - term financial success by attracting, retaining and rewarding eligible participants. As a result of the Company’s organizational structure, a description of which can be found in “Business – Organizational Structure” in Part I, Item I of this Annual Report on Form 10-K, there is no material dilutive effect upon ownership of common stockholders of issuing shares under the Stock Incentive Plan. The issuances do not dilute the book value of the ownership of common stockholders since the restricted stock units are granted at market value, and upon their vesting and the related issuance of shares of common stock, the ownership of IBG, Inc. in IBG LLC, increases proportionately to the shares issued. As a result of such proportionate increase in share ownership, the dilution upon issuance of common stock is borne by IBG LLC’s majority member (i.e., noncontrolling interest), Holdings, and not by IBG, Inc. or its common stockholders. Additionally, dilution of earnings that may take place after issuance of common stock is reflected in EPS reported in the Company’s financial statements. The EPS dilution can be neither estimated nor projected, but historically it has not been material. The Stock Incentive Plan is administered by the Compensation Committee of the Company’s Board of Directors. The Compensation Committee has discretionary authority to determine the eligibility to participate in the Stock Incentive Plan and establishes the terms and conditions of the awards, including the number of awards granted to each participant and all other terms and conditions applicable to such awards in individual grant agreements. Awards are expected to be made primarily through grants of restricted stock units. Stock Incentive Plan awards are subject to issuance over time. All previously granted but not yet earned awards may be canceled by the Company upon the participant’s termination of employment or violation of certain applicable covenants before issuance, unless determined otherwise by the Compensation Committee. The Stock Incentive Plan provides that, upon a change in control, the Compensation Committee may, at its discretion, fully vest any granted but not yet earned awards under the Stock Incentive Plan, or provide that any such granted but not yet earned awards will be honored or assumed, or new rights substituted by the new employer on a substantially similar basis and terms and conditions substantially comparable to those of the Stock Incentive Plan. The Company expects to continue to grant awards on or about December 31 of each year to eligible participants as part of an overall plan of equity compensation. In 2021, the Company’s Compensation Committee approved a change to the vesting schedule for the Stock Incentive Plan. For awards granted on December 31, 2021 onwards, restricted stock units vest and become distributable to participants 20% on each vesting date , which is on or about May 9 of each year, assuming continued employment with the Company and compliance with non-competition and other applicable covenants. The vesting and distribution of grants prior to December 31, 2021 remain in accordance with the following schedule: (a) 10% on the first vesting date, which is on or about May 9 of each year; and (b) an additional 15% on each of the following six anniversaries of the first vesting. Awards granted to directors vest and are distributed as follows: (a) one-time award granted to external directors on December 31 of the year of appointment vests over a five - year period ( 20 % per year) commencing one year after the date of grant, and (b) annual awards granted to all directors on December 31 of each year are fully vested and distributed immediately on grant date . A total of 39,025 restricted stock units have been granted to the directors cumulatively since the plan’s inception. The table below presents Stock Incentive Plan awards granted and the related fair values since the plan’s inception. Fair Value at Date of Grant Units ($ millions) Prior periods (since inception) 28,247,286 $ 758 December 31, 2021 1,084,773 84 April 25, 2022 180,889 1 12 December 31, 2022 1,248,105 2 91 December 31, 2023 1,256,870 102 Total awards granted since inception 32,017,923 $ 1,047 ___________________________ (1) On April 25, 2022, the Company awarded a special grant of restricted stock units to employees. (2) Stock Incentive Plan number of granted restricted stock units related to 2022 was adjusted by 3,722 additional restricted stock units during the year ended December 31, 2023. Estimated future grants under the Stock Incentive Plan are accrued for ratably during each year (see Note 2). In accordance with the vesting schedule, outstanding awards vest and are distributed to participants yearly on or about May 9 of each year. At the end of each year, no vested awards remain undistributed. Compensation expense related to the Stock Incentive Plan recognized in the consolidated statements of comprehensive income was $ 100 million, $ 92 million and $ 80 million for the years ended December 31 , 2023, 2022, and 2021, respectively. Estimated future compensation costs for unvested awards, net of credits for canceled awards, as of December 31 , 2023 are $ 42 million. The table below summarizes the Stock Incentive Plan activity for the periods indicated . Intrinsic Value of SIP Shares Stock which Vested and Incentive Plan were Distributed Units ($ millions) 1 Balance, December 31, 2020 4,974,355 Granted 1,084,773 Canceled ( 55,177 ) Distributed ( 1,220,141 ) $ 85 Balance, December 31, 2021 4,783,810 Granted 1,428,994 2 Canceled ( 179,856 ) Distributed ( 1,276,186 ) $ 67 Balance, December 31, 2022 4,756,761 Granted 1,256,870 Canceled ( 20,480 ) Distributed ( 1,389,032 ) $ 108 Balance, December 31, 2023 4,604,119 ___________________________ (1) Intrinsic value of SIP units distributed represents the compensation value reported to the participants. (2) Stock Incentive Plan number of granted restricted stock units related to 2022 was adjusted by 3,722 additional restricted stock units during the year ended December 31, 2023. Awards previously granted but not yet earned under the stock plans are subject to the plans’ post-employment provisions in the event a participant ceases employment with the Company. Through December 31 , 2023, a total of 1,320,900 restricted stock units have been distributed under these post - employment provisions. These distributions are included in the table above.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Taxes [Abstract]
Income Taxes	11. Income Taxes Income tax expense for the three years ended December 31 , 2023, 2022, and 2021 differs from the U.S. federal statutory rate primarily due to the taxation treatment of income attributable to noncontrolling interests in IBG LLC. These noncontrolling interests are held directly through a U.S. partnership. Accordingly, the income attributable to these noncontrolling interests is reported in the consolidated statements of comprehensive income, but the related U.S. income tax expense attributable to these noncontrolling interests is not reported by the Company as it is generally the obligation of the noncontrolling interests. Income tax expense is also affected by the differing effective tax rates in foreign, state and local jurisdictions where certain of the Company’s subsidiaries are subject to corporate taxation. Deferred income taxes arise primarily due to the amortization of the deferred tax assets recognized in connection with the common stock offerings (see Note 4), differences in the valuation of financial assets and liabilities, and for other temporary differences arising from the deductibility of compensation and depreciation expenses in different periods for accounting and income tax return purposes. Under U.S. GAAP, the Company is allowed to make an accounting policy election of either (1) treating taxes due on future U.S. inclusions in taxable income related to global intangible low tax income as a current-period expense when incurred (the “period cost method”) or (2) factoring such amounts into the Company’s measurement of its deferred taxes (the “deferred method”). The Company has elected the period cost method. The table below presents the components of the provision for income taxes for the periods indicated. Year-Ended December 31, 2023 2022 2021 (in millions) Current Federal $ 104 $ 59 $ 62 State and local 14 8 8 Foreign 109 69 58 Total current 227 136 128 Deferred Federal 27 21 15 State and local 4 4 4 Foreign ( 1 ) ( 5 ) 4 Total deferred 30 20 23 $ 257 $ 156 $ 151 The table below presents a reconciliation of the statutory U.S. Federal income tax rate of 21 % to the Company’s effective tax rate for the periods indicated. Year-Ended December 31, 2023 2022 2021 U.S. Statutory Tax Rate 21.0 % 21.0 % 21.0 % State, local and foreign taxes, net of federal benefit 2.5 % 2.1 % 3.0 % Subtotal 23.5 % 23.1 % 24.0 % Less: rate attributable to noncontrolling interests ( 15.1 %) ( 15.3 %) ( 15.6 %) Total 8.4 % 7.8 % 8.4 % The table below presents significant components of the Company’s deferred tax assets and liabilities, which are reported in other assets and in accounts payable, accrued expenses and other liabilities, respectively, in the consolidated statements of financial condition for the periods indicated. December 31, 2023 2022 2021 (in millions) Deferred tax assets Arising from the acquisition of interests in IBG LLC $ 197 $ 193 $ 209 Deferred compensation 17 14 11 Other 31 34 22 Total deferred tax assets 245 241 242 Deferred tax liabilities Foreign 4 2 1 Other 10 7 11 Total deferred tax liabilities 14 9 12 Net deferred tax assets $ 231 $ 232 $ 230 As of and for the years ended December 31, 2023 and 2022, the Company had no material valuation allowances on deferred tax assets. The Company is subject to taxation in the U.S. and various states and foreign jurisdictions. As of December 31, 2023, the Company is no longer subject to U.S. Federal and State income tax examinations for tax years before 2016, and to non-U.S. income tax examinations for tax years prior to 2012. As of December 31 , 2023, accumulated earnings held by non - U.S. subsidiaries totaled $ 2.7 billion (as of December 31, 2022 $ 1.9 billion), of which $ 2.4 billion of such earnings are indefinitely reinvested abroad due to regulatory and other capital requirements in foreign jurisdictions. As a result, the Company has not provided for its proportionate share of additional foreign taxes or deferred U.S. tax on Internal Revenue Code (“IRC”) Section 986 gains/losses on previously taxed earnings and any local foreign withholding taxes associated with the repatriation of such earnings. If the Company were to record a deferred tax liability due to a hypothetical repatriation of such earnings, the estimated amount of such taxes would be up to $ 16 million of foreign withholding taxes as of December 31, 2023. Under U.S. GAAP, a tax benefit from an uncertain tax position may be recognized when it is more likely than not that the position will be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. Based upon the Company’s review of its federal, state, local and foreign income tax returns and tax filing positions, the Company has recorded a $ 2 million tax liability for an uncertain tax position for an IRS audit primarily related to the IRC Section 199 Domestic Production Activities Deduction.

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Leases	12. Leases All of the Company’s leases are classified as operating leases and primarily consist of real estate leases for corporate offices, data centers and other facilities. As of December 31 , 2023, the weighted-average remaining lease term on these leases is approximately 6 years and the weighted-average discount rate used to measure the lease liabilities is approximately 3.73 %. For the year ended December 31 , 2023, right-of-use assets obtained under new operating leases were $ 28 million. The Company’s lease agreements do not contain any residual value guarantees, restrictions, or covenants. The table below presents balances reported in the consolidated statements of financial condition related to the Company’s leases for the periods indicated. December 31, 2023 2022 (in millions) Right-of-use assets 1 $ 120 $ 119 Lease liabilities 1 $ 143 $ 140 ___________________________ (1) Right-of-use assets are included in other assets and lease liabilities are included in accounts payable, accrued expenses and other liabilities in the Company’s consolidated statements of financial condition. The table below presents balances reported in the consolidated statements of comprehensive income related to the Company’s leases for the periods indicated. Year-Ended December 31, 2023 2022 2021 (in millions) Operating lease cost $ 35 $ 32 $ 28 Variable lease cost 6 4 5 Total lease cost $ 41 $ 36 $ 33 The table below reconciles the undiscounted cash flows of the Company’s leases to the present value of its operating lease payments for the period indicated. December 31, 2023 (in millions) 2024 $ 34 2025 28 2026 23 2027 18 2028 17 Thereafter 40 Total undiscounted operating lease payments 160 Less: imputed interest ( 17 ) Present value of operating lease liabilities $ 143

Property, Equipment and Intangi

Property, Equipment and Intangible Assets	12 Months Ended
	Dec. 31, 2023
Property, Equipment and Intangible Assets [Abstract]
Property, Equipment and Intangible Assets	13. Property, Equipment and Intangible Assets Property, equipment and intangible assets, which are included in other assets in the consolidated statements of financial condition, consist of leasehold improvements, computer equipment, software developed for the Company’s internal use, office furniture and equipment. The table below presents balances related to property, equipment and intangible assets for the periods indicated. December 31, 2023 2022 (in millions) Leasehold improvements $ 56 $ 51 Computer equipment 90 84 Office furniture and equipment 15 16 161 151 Less - accumulated depreciation and amortization ( 80 ) ( 58 ) Property and equipment, net 81 93 Internally developed software 84 87 Other intangible assets 4 4 Less - accumulated amortization ( 45 ) ( 43 ) Intangible assets, net 43 48 Total property, equipment, and intangible assets, net $ 124 $ 141 Depreciation and amortization of $ 65 million, $ 58 million and $ 50 million, for the three years ended December 31, 2023, 2022, and 2021, respectively, is included in occupancy, depreciation and amortization expenses in the consolidated statements of comprehensive income. Amortization expense related to the Company’s intangible assets as of December 31, 2023 is expected to be approximately $ 24 million, $ 15 million, and $ 4 million, for years ended December 31, 2024, 2025, and 2026, respectively.

Commitments, Contingencies And

Commitments, Contingencies And Guarantees	12 Months Ended
	Dec. 31, 2023
Commitments, Contingencies And Guarantees [Abstract]
Commitments, Contingencies And Guarantees	14. Commitments, Contingencies and Guarantees Legal, Regulatory and Governmental Matters The Company is subject to certain pending and threatened legal, regulatory and governmental actions and proceedings that arise out of the normal course of business. Given the inherent difficulty of predicting the outcome of such matters, particularly in proceedings where claimants seek substantial or indeterminate damages, or which are in their early stages, the Company is generally not able to quantify the actual loss or range of loss related to such legal proceedings, the manner in which they will be resolved, the timing of their final resolution or the ultimate settlement. Management believes that the resolution of these matters will not have a material effect, if any, on the Company’s business or financial condition, but may have a material impact on the results of operations for a given period. The Company accounts for potential losses related to litigation in accordance with FASB ASC Topic 450, “Contingencies.” As of December 31 , 2023 and 2022, accruals for potential losses related to legal, regulatory and governmental actions and proceedings matters were not material. Trading Technologies Matter As previously disclosed, on February 3, 2010, Trading Technologies International, Inc. (“Trading Technologies”) filed a complaint in the U.S. District Court for the Northern District of Illinois, Eastern Division (the “District Court”), against IBG LLC and IB LLC (the “Defendants”). The complaint, as amended, alleged that the Defendants infringed twelve U.S. patents held by Trading Technologies, and sought damages and injunctive relief. After proceedings before the United States Patent and Trademark Office Patent Trial Appeal Board , and review by the United States Court of Appeals for the Federal Circuit, all but four patents were found to be invalid. In June 2021, the District Court found two of the remaining four patents to be invalid, and trial on the two remaining patents began on August 6, 2021. On September 7, 2021, the jury rendered its verdict, finding that the Defendants infringed the two patents and awarding $ 6.6 million in damages to Trading Technologies, while rejecting Trading Technologies’ claims of willful infringement and request for damages of at least $ 962.4 million. On January 11, 2022, the District Court awarded Trading Technologies pre-judgment interest of $ 2.1 million and post-judgment interest, and on March 31, 2022, granted Trading Technologies’ bill of costs of $ 490,232 . On March 24, 2022, Harris Brumfield, the successor-in-interest to the patents-in-suit, filed a notice of appeal with the Court of Appeals of the Federal Circuit . On April 7, 2022, the Defendants filed a notice of cross-appeal, which the Defendants subsequently dismissed. After briefing on the appeal, oral argument was held on January 8, 2024. The parties are awaiting the Federal Circuit’s decision. Class Action Matter On December 18, 2015, a former individual customer filed a purported class action complaint against IB LLC, IBG, Inc., and Thomas Frank, Ph.D., the Company’s Executive Vice President and Chief Information Officer, in the U.S. District Court for the District of Connecticut. The complaint alleges that a purported class of IB LLC’s customers were harmed by alleged “flaws” in the computerized system used to close out (i.e., liquidate) positions in customer brokerage accounts that have margin deficiencies. The complaint seeks, among other things, undefined compensatory damages and declaratory and injunctive relief. On September 28, 2016, the District Court issued an order granting the Company’s motion to dismiss the complaint in its entirety, without leave to amend. On September 28, 2017, the plaintiff appealed to the United States Court of Appeals for the Second Circuit. On September 26, 2018, the Court of Appeals affirmed the dismissal of plaintiff’s claims of breach of contract and commercially unreasonable liquidation but vacated and remanded back to the District Court plaintiff’s claims for negligence. The Company’s motion to dismiss plaintiff’s subsequent second amended complaint was denied on September 30, 2019. On July 14, 2022, after obtaining leave to amend his complaint, the plaintiff filed a third amended complaint. The Company’s answer and counterclaim were filed on July 26, 2022. On August 25, 2023, the Court granted plaintiff’s motion for class certification, certifying a class that consists of IB LLC account holders (with some exclusions) who had positions liquidated from December 18, 2013 to the date of trial at prices outside of a “pricing corridor” defined in the Court’s decision. On September 8, 2023, the Company filed a petition for permission to appeal the District Court’s class certification decision to the United States Court of Appeals for the Second Circuit, which denied the Company’s petition on December 19, 2023. The Company continues to believe that a purported class action is inappropriate given the great differences in portfolios, markets and many other circumstances surrounding the liquidation of any particular customer’s margin-deficient account. Pursuant to a District Court scheduling order, trial is tentatively scheduled to commence in 2025. IB LLC and the related defendants continue to believe that the plaintiff’s claims are deficient and intend to continue to defend themselves vigorously and, consistent with past practice, may pursue any potential claims for counsel fees and expenses incurred in defending the case. Regulatory Matters On September 29, 2023, IB LLC and Interactive Brokers Corp. (“IB Corp.”) entered into settlements with the SEC and CFTC to resolve investigations into compliance with records preservation requirements relating to business communications sent over electronic messaging channels that IB LLC and IB Corp. had not approved. Under the terms of the settlements, IB LLC and IB Corp. together paid $ 35 million to the SEC and $ 20 million to the CFTC, and agreed to cease and desist from further violations of certain records preservation requirements. As required by the settlements, IB LLC and IB Corp. have also engaged an independent compliance consultant and are implementing additional enhancements to their related compliance policies and procedures. As has been publicly reported, the SEC and CFTC have settled a number of similar investigations of other financial services firms, and are still in the process of conducting other similar investigations. IB LLC has identified a number of issues dating back to 2016 related to the Company’s compliance with sanctions regulations, predominantly transactions engaged in from countries or by entities prohibited by the Office of Foreign Assets Control (“OFAC”) of the United States Department of the Treasury. The Company has made voluntary self-disclosures to OFAC, has received additional inquiries from OFAC related to the Company’s sanctions compliance program, and is cooperating with the investigation. The Company cannot currently predict when OFAC’s investigation will conclude or the exact amount of any potential civil money penalty. The Company believes that, in addition to its voluntary self-disclosures and continued cooperation with OFAC, the significant investment in and improvements to the Company’s Anti-Money Laundering and Sanctions programs over the past five years will be considered as mitigating factors with respect to the matter, and that any monetary fines or restrictions will not be material to the Company’s financial results. Guarantees Certain of the operating subsidiaries provide guarantees to securities and commodities clearing houses and exchanges which meet the accounting definition of a guarantee under FASB ASC Topic 460, “Guarantees.” Under standard membership agreements, clearing house and exchange members are required to guarantee collectively the performance of other members. Under the agreements, if a member becomes unable to satisfy its obligations, other members would be required to meet shortfalls. In the opinion of management, the operating subsidiaries’ liability under these arrangements is not quantifiable and could exceed the cash and securities they have posted as collateral. However, the potential for these operating subsidiaries to be required to make payments under these arrangements is remote. Accordingly, no contingent liability is carried in the consolidated statements of financial condition for these arrangements. In connection with its retail brokerage business, IB LLC or other electronic brokerage operating subsidiaries perform securities and commodities execution, clearance and settlement on behalf of their customers for whom they commit to settle trades submitted by such customers with the respective clearing houses. If a customer fails to fulfill its settlement obligations, the respective operating subsidiary must fulfill those settlement obligations. No contingent liability is carried on the consolidated statements of financial condition for such customer obligations. Other Commitments Certain clearing houses, clearing banks and firms used by certain operating subsidiaries are given a security interest in certain assets of those operating subsidiaries held by those clearing organizations. These assets may be applied to satisfy the obligations of those operating subsidiaries to the respective clearing organizations.

Geographic Information

Geographic Information	12 Months Ended
	Dec. 31, 2023
Geographic Information [Abstract]
Geographic Information	15. Geographic Information The Company operates its automated global business in the U.S. and international markets on more than 150 electronic exchanges and market centers. A significant portion of the Company’s net revenues is generated by subsidiaries operating outside the U.S. International operations are conducted in 33 countries in Europe, Asia/Pacific and the Americas (outside the U.S.). The following table presents total net revenues and income before income taxes by geographic area for the periods indicated . Significant transactions and balances between the operating subsidiaries occur, primarily as a result of certain operating subsidiaries holding exchange or clearing organization memberships, which are utilized to provide execution and clearing services to subsidiaries. Intra - region income and expenses and related balances have been eliminated in this geographic information to reflect the external business conducted in each geographic region. The geographic analysis presented below is based on the location of the subsidiaries in which the transactions are recorded. This geographic information does not reflect the way the Company’s business is managed. Year-Ended December 31, 2023 2022 2021 (in millions) Net revenues United States $ 3,028 $ 2,115 $ 1,881 International 1,312 952 833 Total net revenues $ 4,340 $ 3,067 $ 2,714 Income before income taxes United States $ 2,316 $ 1,546 $ 1,474 International 753 452 313 Total income before income taxes $ 3,069 $ 1,998 $ 1,787

Regulatory Requirements

Regulatory Requirements	12 Months Ended
	Dec. 31, 2023
Regulatory Requirements [Abstract]
Regulatory Requirements	16. Regulatory Requirements As of December 31 , 2023, aggregate excess regulatory capital for all operating subsidiaries was $ 10.2 billion. IB LLC, IBKRSS and IB Corp. are subject to the Uniform Net Capital Rule (Rule 15c3 - 1) under the Exchange Act. IB LLC is also subject to the CFTC’s minimum financial requirements (Regulation 1.17). IBC is subject to the Canadian Investment Regulatory Organization risk-adjusted capital requirement. IBKRFS is subject to the Swiss Financial Market Supervisory Authority eligible equity requirement, IBUK is subject to the United Kingdom Financial Conduct Authority Capital Requirements Directive, IBIE is subject to the Central Bank of Ireland financial resources requirement, IBCE is subject to the Hungarian National Bank financial resource requirement, IBI is subject to the National Stock Exchange of India net capital requirements, IBHK is subject to the Hong Kong Securities Futures Commission liquid capital requirement, IBSJ is subject to the Japanese Financial Supervisory Agency capital requirements, IBSG is subject to the Monetary Authority of Singapore capital requirements, and IBA is subject to the Australian Securities Exchange liquid capital requirement. The table below summarizes capital, capital requirements and excess regulatory capital as of December 31, 2023. Net Capital/ Eligible Equity Requirement Excess (in millions) IB LLC $ 7,319 $ 823 $ 6,496 IBHK 1,265 223 1,042 IBIE 685 189 496 Other regulated operating subsidiaries 2,333 142 2,191 $ 11,602 $ 1,377 $ 10,225 Regulatory capital requirements could restrict the operating subsidiaries from expanding their business and declaring dividends if their net capital does not meet regulatory requirements. Also, certain operating subsidiaries are subject to other regulatory restrictions and requirements. As of December 31 , 2023, all regulated operating subsidiaries were in compliance with their respective regulatory capital requirements.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2023
Related Party Transactions [Abstract]
Related Party Transactions	17. Related Party Transactions Receivable from affiliate, reported in other assets in the consolidated statements of financial condition, represents amounts advanced to Holdings and payable to affiliate represents amounts payable to Holdings under the Tax Receivable Agreement (see Note 4). Included in receivables from and payables to customers in the consolidated statements of financial condition as of December 31 , 2023 and 2022 were accounts receivable from directors, officers and their affiliates of $ 6 million and $ 17 million, respectively, and payables of $ 985 million and $ 1,208 million, respectively. The Company may extend credit to these related parties in connection with margin and securities loans. Such loans are (i) made in the ordinary course of business, (ii) are made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable loans with persons not related to the company, and (iii) do not involve more than the normal risk of collectability or present other unfavorable features.

Senior Notes Payable

Senior Notes Payable	12 Months Ended
	Dec. 31, 2023
Senior Notes Payable [Abstract]
Senior Notes Payable	18. Senior Notes Payable IBG LLC from time to time may offer senior notes in private placements to certain qualified customers of IB LLC at an issue price of $ 1 thousand per note. The senior notes will mature no later than the thirtieth day following the issuance date. IBG LLC, at its option, may redeem the senior notes at any time, at a redemption price equal to 100 % of the principal amount of the senior notes to be redeemed, plus accrued interest. The senior notes will pay a fixed rate of interest during their tenure. The interest rate is calculated by adding the benchmark rate to a rate (spread) that IBG LLC will announce from time to time. The benchmark rate is the effective federal funds rate as reported by the Federal Reserve Bank of New York on the morning of the date of the offering. IBG LLC intends to use the proceeds for general financing purposes when interest spread opportunities arise. The carrying value of the senior notes approximates fair value since the notes are short-term in nature. During the years ended December 31, 2023 and 2022, the Company did no t issue any senior notes. As of December 31 , 2023 and 2022, there were no senior notes outstanding. Interest expense on the senior notes for the year ended December 31, 2023, 2022, and 2021 was $ 0 , and $ 0 and $ 1 million, respectively.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	19. Subsequent Events The Company has evaluated subsequent events for adjustment to or disclosure in its consolidated financial statements through the date the consolidated financial statements were issued. Except as disclosed in Note 4 and Note 14, no other recordable or disclosable events occurred. *****

Schedule I - Condensed Financia

Schedule I - Condensed Financial Information of Registrant (Parent Company Only)	12 Months Ended
	Dec. 31, 2023
Schedule I - Condensed Financial Information of Registrant (Parent Company Only) [Abstract]
Schedule I - Condensed Financial Information of Registrant (Parent Company Only)	INTERACTIVE BROKERS GROUP, INC. (Parent Company Only) CONDENSED STATEMENTS OF FINANCIAL CONDITION December 31, (in millions, except share amounts) 2023 2022 Assets Cash and cash equivalents $ 6 $ 1 Investments in subsidiaries, equity basis 3,571 2,845 Other assets 230 231 Total assets $ 3,807 $ 3,077 Liabilities and Equity Liabilities: Payable to affiliates $ 209 $ 214 Accrued expenses and other liabilities 14 15 223 229 Stockholders' equity: Common stock, $ 0.01 par value per share: Class A – Authorized - 1,000,000,000 , Issued - 107,178,928 and 103,057,148 shares, Outstanding – 107,045,994 and 102,887,728 shares as of December 31, 2023 and 2022 1 1 Class B – Authorized, Issued and Outstanding – 100 shares as of December 31, 2023 and 2022 — — Additional paid-in capital 1,726 1,581 Retained earnings 1,852 1,294 Accumulated other comprehensive income, net of income taxes of $ 0 and $ 0 as of December 31, 2023 and 2022 8 ( 22 ) Treasury stock, at cost, 133,034 and 169,420 shares as of December 31, 2023 and 2022 ( 3 ) ( 6 ) Total equity 3,584 2,848 Total liabilities and equity $ 3,807 $ 3,077 See accompanying notes to the condensed financial statements. INTERACTIVE BROKERS GROUP, INC. (Parent Company Only) CONDENSED STATEMENTS OF COMPREHENSIVE INCOME Year-Ended December 31, (in millions) 2023 2022 2021 Income (loss) before income from subsidiaries $ 5 $ 4 $ — Undistributed gains of subsidiaries, net 737 463 383 Income tax expense 142 87 75 Net income $ 600 $ 380 $ 308 Net income available for common stockholders $ 600 $ 380 $ 308 Cumulative translation adjustment, net of tax 30 ( 26 ) ( 22 ) Comprehensive income available for common stockholders $ 630 $ 354 $ 286 See accompanying notes to the condensed financial statements. INTERACTIVE BROKERS GROUP, INC. (Parent Company Only) CONDENSED STATEMENTS OF CASH FLOWS Year-Ended December 31, (in millions) 2023 2022 2021 Cash flows from operating activities Net income $ 600 $ 380 $ 308 Adjustments to reconcile net income to net cash used in operating activities Undistributed gains of subsidiaries, net ( 737 ) ( 463 ) ( 383 ) Deferred income taxes 34 28 18 (Gain) loss on remeasurement of Tax Receivable Agreement liability ( 7 ) ( 6 ) ( 1 ) Changes in operating assets and liabilities ( 33 ) 20 21 Net cash used in operating activities ( 143 ) ( 41 ) ( 37 ) Cash flows provided by investing activities 185 127 111 Cash flows used in financing activities ( 67 ) ( 59 ) ( 56 ) Effect of exchange rate changes on cash and cash equivalents 30 ( 26 ) ( 22 ) Net increase in cash and cash equivalents 5 1 ( 4 ) Cash and cash equivalents at beginning of period 1 — 4 Cash and cash equivalents at end of period $ 6 $ 1 $ — Supplemental disclosures of cash flow information Cash paid for interest $ 2 $ 1 $ 1 Cash paid for taxes, net $ 111 $ 67 $ 57 Non-cash investing activities: Non-cash distributions from subsidiaries $ — $ 1 $ 1 See accompanying notes to the condensed financial statements. INTERACTIVE BROKERS GROUP, INC. (Parent Co mpany Only) NOTES TO CONDEN SED FINANCIAL STATEMENTS 1. Basis of Presentation The accompanying condensed financial statements (the “Parent Company Financial Statements”) of Interactive Brokers Group, Inc. (“IBG, Inc.”), a Delaware holding company, including the notes thereto, should be read in conjunction with the consolidated financial statements of IBG, Inc. and its subsidiaries (the “Company”) and the notes thereto. IBG, Inc.’s primary asset is its ownership interest in IBG LLC, an automated global electronic broker specializing in executing and clearing trades in stocks, options, futures, foreign exchange instruments, bonds, mutual funds, exchange-traded funds (“ETFs”) and precious metals on more than 150 electronic exchanges and market centers around the world and offering custody, prime brokerage, securities and margin lending services to customers. The preparation of the Parent Company Financial Statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts and disclosures in the condensed financial statements and accompanying notes. Income Taxes Refer to Note 2 to the consolidated financial statements. 2. Related Party Transactions As of December 31, 2023 and 2022, receivables from affiliates were immaterial. Dividends received from IBG LLC for the three years ended December 31, 2023, 2022, and 2021, were $ 185 million, $ 128 million and $ 112 million, respectively. As of December 31, 2023 and 2022, respectively, payable to affiliates of $ 210 million and $ 214 million consisted primarily of amounts payable to Holdings under the Tax Receivable Agreement. 3. Stockholders’ Equity Refer to Note 4 to the consolidated financial statements. 4. Employee Incentive Plans Refer to Note 10 to the consolidated financial statements. 5. Commitments, Contingencies and Guarantees Refer to Note 14 to the consolidated financial statements. 6. Subsequent Events As required by FASB ASC Topic, “Subsequent Events,” IBG, Inc. has evaluated subsequent events for adjustment to or disclosure in its condensed financial statements through the date the condensed financial statements were issued. Except as disclosed in Note 4 and Note 14 to the consolidated financial statements, no other recordable or disclosable events occurred.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These consolidated financial statements are presented in U.S. dollars and have been prepared in accordance with accounting principles generally accepted in the U.S. (“U.S. GAAP”) and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding financial reporting with respect to Form 10 - K. These consolidated financial statements include the accounts of the Company and its consolidated subsidiaries and reflect all adjustments of a normal and recurring nature that are, in the opinion of management, necessary for the fair presentation of the results for the periods presented.
Principles Of Consolidation, Including Noncontrolling Interests	Principles of Consolidation, including Noncontrolling Interests These consolidated financial statements include the accounts of IBG, Inc. and its majority and wholly-owned subsidiaries. As sole managing member of IBG LLC, IBG, Inc. exerts control over IBG LLC’s operations. In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810, “ Consolidation, ” the Company consolidates IBG LLC’s financial statements and records the interests in IBG LLC that it does not own as noncontrolling interests. The Company’s policy is to consolidate all other entities in which it owns more than 50% unless it does not have control and any potential variable interest entities (“VIEs”) where the Company is deemed to be the primary beneficiary when it has the power to make the decisions that most significantly affect the economic performance of the VIE and has the obligation to absorb significant losses or the right to receive benefits that could potentially be significant to the VIE. As of December 31, 2023, the Company was not the primary beneficiary of any VIEs . All inter - company balances and transactions have been eliminated.
Use Of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts and disclosures in these consolidated financial statements and accompanying notes. These estimates and assumptions are based on judgment and the best available information at the time. Therefore, actual results could differ materially from those estimates. Such estimates include the allowance for credit losses, valuation of certain investments, compensation accruals, current and deferred income taxes, and contingency reserves.
Fair Value	Fair Value Substantially all of the Company’s assets and liabilities, including financial instruments, are carried at fair value based on observable market prices and are marked to market, or are assets and liabilities which are short - term in nature and are carried at amounts that approximate fair value. The Company applies the fair value hierarchy in accordance with FASB ASC Topic 820, “ Fair Value Measurement” (“ASC Topic 820”) , to prioritize the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities and the lowest priority to unobservable inputs. The three levels of the fair value hierarchy are: Level 1 Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2 Quoted prices for similar assets in an active market, quoted prices in markets that are not considered to be active or financial instruments for which all significant inputs are observable, either directly or indirectly. Level 3 Prices or valuations that require inputs that are both significant to fair value measurement and unobservable. Financial instruments owned, at fair value, and financial instruments sold, but not yet purchased, at fair value are generally classified as Level 1 of the fair value hierarchy. The Company’s Level 1 financial instruments, which are valued using quoted market prices as published by exchanges and clearing houses or otherwise broadly distributed in active markets, include active listed stocks, options, warrants and U.S. and foreign government securities. The Company does not adjust quoted prices for financial instruments classified as Level 1 of the fair value hierarchy, even if the Company may hold a large position whereby a purchase or sale could reasonably be expected to impact quoted prices. Currency forward contracts are valued using broadly distributed bank and broker prices and are classified as Level 2 of the fair value hierarchy since inputs to their valuation can generally be corroborated by market data. Precious metals are valued using an internal model, which incorporates the exchange-traded futures price of the underlying instruments, benchmark interest rates and estimated storage costs, and are classified as Level 2 of the fair value hierarchy since the significant inputs to their valuation are observable . Other securities that are not traded in active markets are also classified as Level 2 of the fair value hierarchy. Level 3 financial instruments are comprised of securities that have been delisted or otherwise are no longer tradable in active markets and have been valued by the Company based on internal estimates.
Earnings Per Share	Earnings per Share Earnings per share (“EPS”) is computed in accordance with FASB ASC Topic 260, “ Earnings per Share .” Basic EPS is computed by dividing the net income available for common stockholders by the weighted average number of shares outstanding for that period. Diluted EPS is calculated by dividing the net income available for common stockholders by the diluted weighted average shares outstanding for that period. Diluted EPS includes the determinants of basic EPS and, in addition, reflects the dilutive effect of shares of common stock estimated to be distributed in the future under the Company’s stock-based compensation plans, with no adjustments to net income available for common stockholders for potentially dilutive common shares.
Current Expected Credit Losses	Current Expected Credit Losses The Company follows FASB ASC Topic 326 – “Financial Instruments – Credit Losses” (“ASC Topic 326”) which applies to financial assets measured at amortized cost, held-to-maturity debt securities and off-balance sheet credit exposures. For on-balance sheet assets, an allowance must be recognized at the origination or purchase of in-scope assets and represents the expected credit losses over the contractual life of those assets. Expected credit losses on off-balance sheet credit exposures must be estimated over the contractual period the Company is exposed to credit risk as a result of a present obligation to extend credit. The impact to the current period is not material since the Company’s in-scope assets are primarily subject to collateral maintenance provisions for which the Company elected to apply the practical expedient of reporting the difference between the fair value of the collateral and the amortized cost for the in-scope assets as the allowance for current expected credit losses.
Cash And Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents consist of deposits with banks and all highly liquid investments, with maturities of three months or less, that are not segregated and deposited for regulatory purposes or to meet margin requirements at clearing houses and clearing banks.
Cash And Securities - Segregated For Regulatory Purposes	Cash and Securities - Segregated for Regulatory Purposes As a result of customer activities, certain operating subsidiaries are obligated by rules mandated by their primary regulators to segregate or set aside cash or qualified securities to satisfy such regulations, which have been promulgated to protect customer assets. Restricted cash represents cash and cash equivalents that are subject to withdrawal or usage restrictions. Cash segregated for regulatory purposes meets the definition of restricted cash and is included in “cash, cash equivalents and restricted cash” in the consolidated statements of cash flows. The table below presents the composition of the Company’s securities segregated for regulatory purposes for the periods indicated. December 31, 2023 2022 (in millions) U.S. and foreign government securities $ 5,684 $ 4,641 Municipal securities 70 82 Securities purchased under agreements to resell 1 29,632 27,058 $ 35,386 $ 31,781 ___________________________ (1) These balances are collateralized by U.S. government securities.
Securities Borrowed And Securities Loaned	Securities Borrowed and Securities Loaned Securities borrowed and securities loaned are recorded at the amount of the cash collateral advanced or received. Securities borrowed transactions require the Company to provide counterparties with collateral, which may be in the form of cash, letters of credit or other securities. With respect to securities loaned, the Company receives collateral, which may be in the form of cash or other securities in an amount generally in excess of the fair value of the securities loaned. The Company monitors the market value of securities borrowed and loaned daily, with additional collateral obtained or refunded as permitted contractually. The Company’s policy is to net, in the consolidated statements of financial condition, securities borrowed and securities loaned contracts entered into with the same counterparty that meet the offsetting requirements prescribed in FASB ASC Topic 210-20, “Balance Sheet – Offsetting” (“ASC Topic 210-20”). Securities lending fees received and paid by the Company are included in interest income and interest expense, respectively, in the consolidated statements of comprehensive income.
Securities Purchased Under Agreements To Resell and Securities Sold Under Agreements to Repurchase	Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase Securities purchased under agreements to resell and securities sold under agreements to repurchase, which are reported as collateralized financing transactions, are recorded at contract value, which approximates fair value. To ensure that the fair value of the underlying collateral remains sufficient, the collateral is valued daily with additional collateral obtained or excess collateral returned, as permitted under contractual provisions. The Company’s policy is to net, in the consolidated statements of financial condition, securities purchased under agreements to resell transactions and securities sold under agreements to repurchase transactions entered into with the same counterparty that meet the offsetting requirements prescribed in ASC Topic 210-20.
Financial Instruments Owned And Sold But Not Yet Purchased, at Fair Value	Financial Instruments Owned and Financial Instruments Sold, But Not Yet Purchased, at Fair Value Financial instrument transactions are accounted for on a trade date basis. Financial instruments owned and financial instruments sold, but not yet purchased are stated at fair value based upon quoted market prices, or if not available, are valued by the Company based on internal estimates (see Fair Value above). The Company’s financial instruments pledged to counterparties where the counterparty has the right, by contract or custom, to sell or repledge the financial instruments are reported as financial instruments owned and pledged as collateral in the consolidated statements of financial condition.
Customer Receivables And Payables	Customer Receivables and Payables Receivables from and payables to customers include amounts due on cash and margin transactions, including futures contracts transacted on behalf of customers. Securities owned by customers, including those that collateralize margin loans or other similar transactions, are not reported in the consolidated statements of financial condition. Amounts receivable from customers that are determined by management to be uncollectible are recorded as customer bad debt expense in the consolidated statements of comprehensive income.
Receivables From And Payables To Brokers, Dealers And Clearing Organizations	Receivables from and Payables to Brokers, Dealers and Clearing Organizations Receivables from and payables to brokers, dealers and clearing organizations include net receivables and payables from unsettled trades, including amounts related to futures and options on futures contracts executed on behalf of customers, amounts receivable for securities not delivered by the Company to the purchaser by the settlement date (“fails to deliver”) and cash deposits. Payables to brokers, dealers and clearing organizations also include amounts payable for securities not received by the Company from a seller by the settlement date (“fails to receive”).
Investments	Investments The Company makes certain strategic investments related to its business which are included in other assets in the consolidated statements of financial condition. The Company accounts for these investments as follows:  Under the equity method of accounting as required under FASB ASC Topic 323, “ Investments - Equity Method and Joint Ventures. ” These investments, including where the investee is a limited partnership or limited liability company, are recorded at the fair value amount of the Company’s initial investment and are adjusted each period for the Company’s share of the investee’s income or loss. Contributions paid to and distributions received from equity method investees are recorded as additions or reductions, respectively, to the respective investment balance.  At fair value, if the investment in equity securities has a readily determinable fair value.  At adjusted cost, if the investment does not have a readily determinable fair value. Adjusted cost represents the historical cost, less impairment if any. If the Company identifies observable price changes in orderly transactions for the identical or a similar investment of the same issuer, the Company measures the equity security at fair value as of the date that the observable transaction occurred in accordance with FASB ASC Topic 321, “Investments in Equity Securities.” A judgmental aspect of accounting for investments is evaluating whether a decline in the value of an investment has occurred. The evaluation of impairment is dependent on specific quantitative and qualitative factors and circumstances surrounding an investment, including recurring operating losses, credit defaults and subsequent rounds of financing. Most of the Company’s equity investments do not have readily determinable market values. All investments are reviewed for changes in circumstances or occurrence of events that suggest the Company’s investment may not be recoverable. An impairment loss, if any, is recognized in the period the determination is made . The table below presents the composition of the Company’s investments for the periods indicated. December 31, 2023 2022 (in millions) Equity method investments 1 $ 142 $ 121 Investments in equity securities at adjusted cost 2 22 16 Investments in equity securities at fair value 2 44 34 Investments in exchange memberships and equity securities of certain exchanges 2 2 2 $ 210 $ 173 ___________________________ (1) The Company’s share of income or losses is included in other income in the consolidated statements of comprehensive income. (2) These investments do not qualify for the equity method of accounting. Dividends received are included in other income in the consolidated statements of comprehensive income.
Property, Equipment, and Intangible Assets	Property, Equipment and Intangible Assets Property, equipment and intangible assets, which are included in other assets in the consolidated statements of financial condition, consist of leasehold improvements, computer equipment, software developed for the Company’s internal use, office furniture and equipment . Property and equipment are recorded at historical cost, less accumulated depreciation and amortization. Additions and improvements that extend the lives of assets are capitalized, while expenditures for repairs and maintenance are expensed as incurred. Depreciation and amortization are computed using the straight - line method. Equipment is depreciated over the estimated useful lives of the assets, while leasehold improvements are amortized over the lesser of the estimated economic useful life of the asset or the term of the lease. Computer equipment is depreciated over three to five years and office furniture and equipment are depreciated over five to seven years . Intangible assets with a finite life are amortized on a straight-line basis over their estimated useful lives of three to five years , and tested for recoverability whenever events indicate that the carrying amounts may not be recoverable. Qualifying costs for internally developed software are capitalized and amortized over the expected useful life of the developed software, not to exceed three years . Upon retirement or disposition of property and equipment, the cost and related accumulated depreciation are removed from the consolidated statements of financial condition and any resulting gain or loss is recorded in other income in the consolidated statements of comprehensive income. Fully depreciated (or amortized) assets are retired periodically throughout the year.
Leases	Leases The Company reviews all relevant contracts to determine if the contract contains a lease at its inception date. A contract contains a lease if the contract conveys to the company the right to control the use of an underlying asset for a period of time in exchange for consideration. If the Company determines that a contract contains a lease, it recognizes, in the consolidated statements of financial condition, a lease liability and a corresponding right-of-use asset on the commencement date of the lease. The lease liability is initially measured at the present value of the future lease payments over the lease term using the rate implicit in the lease or, if not readily determinable, the Company’s secured incremental borrowing rate. An operating lease right-of-use asset is initially measured at the value of the lease liability minus any lease incentives and initial direct costs incurred plus any prepaid rent. The Company’s leases are classified as operating leases and consist of real estate leases for office space, data centers and other facilities. Each lease liability is measured using the Company’s secured incremental borrowing rate, which is based on an internally developed yield curve using interest rates of third parties’ corporate debt issued with a similar risk profile as the Company and a duration similar to the lease term. The Company’s leases have remaining terms of less than one year to thirteen years , some of which include options to extend the lease term, and some of which include options to terminate the lease upon notice. The Company considers these options when determining the lease term used to calculate the right-of-use asset and the lease liability when the Company is reasonably certain it will exercise such option. The Company’s operating leases contain both lease components and non-lease components . Non-lease components are distinct elements of a contract that are not related to securing the use of the underlying assets, such as common area maintenance and other management costs. The Company elected to measure the lease liability by combining the lease and non-lease components as a single lease component. As such, the Company includes the fixed payments and any payments that depend on a rate or index that relate to the lease and non-lease components in the measurement of the lease liability. Some of the non-lease components are variable and not based on an index or rate, and as a result, are not included in the measurement of the right-of-use asset or lease liability. Operating lease expense is recognized on a straight-line basis over the lease term and is included in occupancy, depreciation and amortization expense in the Company’s consolidated statements of comprehensive income.
Crypto-Assets Safeguarding Liability And Corresponding Safeguarding Asset	Crypto-assets safeguarding liability and corresponding safeguarding asset Staff Accounting Bulletin No. 121 (“SAB 121”) requires an entity to recognize a liability to reflect its obligation to safeguard the crypto-assets held for its platform users and a corresponding safeguarding asset on its balance sheet, even when the Company does not control the crypto-assets. Both the crypto-asset safeguarding liability and the corresponding safeguarding asset shall be measured at the fair value of the crypto-assets held for the platform users with the measurement of the safeguarding asset taking into account any potential loss events. The Company has entered into agreements with third-party Cryptocurrency Service Providers (“CSPs”), which provide (i) cryptocurrency exchange platforms and services whereby investors can buy and sell certain cryptocurrencies and (ii) custody services for certain cryptocurrencies, enabling some of our customers to trade and custody Bitcoin (BTC), Ethereum (ETH), Litecoin (LTC), Bitcoin Cash (BCH) and potentially other cryptocurrencies via CSPs. Even though the Company is not responsible for the safeguarding of crypto-assets at the CSPs, its customers’ crypto-assets held at the CSPs are deemed to be in scope of SAB 121. As of December 31, 2023, the fair value of the Company’s customers’ crypto-assets held at the CSPs that the Company recognized on its balance sheet for both the crypto-asset safeguarding liability and the corresponding safeguarding asset, which are included in “accounts payable, accrued expenses and other liabilities” and “other assets,” respectively, in the consolidated statements of financial condition, was $ 172 million ($ 80 million as of December 31, 2022), which consisted of $ 120 million of Bitcoin, $ 50 million of Ethereum and $ 2 million of other crypto-assets. Changes in the fair value of crypto-assets, held by our customers, do not impact our consolidated statements of comprehensive income unless a loss event is identified. As of December 31, 2023, no loss events were identified.
Comprehensive Income And Foreign Currency Translation	Comprehensive Income and Foreign Currency Translation The Company’s operating results are reported in the consolidated statements of comprehensive income pursuant to FASB ASC Topic 220, “ Comprehensive Income. ” Comprehensive income consists of two components: net income and other comprehensive income (“OCI”). The Company’s OCI is comprised of gains and losses resulting from translating foreign currency financial statements of non-U.S. subsidiaries , net of related income taxes, where applicable. In general, the practice and intention of the Company is to reinvest the earnings of its non - U.S. subsidiaries in those operations; therefore, tax is usually not accrued on OCI. The Company’s non - U.S. domiciled subsidiaries have a functional currency that is other than the U.S. dollar. Such subsidiaries’ assets and liabilities are translated into U.S. dollars at period - end exchange rates, and revenues and expenses are translated at average exchange rates prevailing during the period. Adjustments that result from translating amounts from a subsidiary’s functional currency to the U.S. dollar (as described above) are reported net of tax, where applicable, in accumulated OCI in the consolidated statements of financial condition.
Revenue Recognition	Revenue Recognition Commissions Commissions earned for executing and/or clearing transactions are accrued on a trade date basis and are reported as commissions in the consolidated statements of comprehensive income. Commissions also include payments for order flow income received from IBKR Lite SM liquidity providers. The Company’s IBKR Lite SM offering provides commission-free trades on U.S. exchange-listed stocks and ETFs and generates no commission revenues from customers on these trades. See Note 8 for further information on revenue from contracts with customers. Other Fees and Services The Company earns fee income on services provided to customers, which includes market data fees, risk exposure fees, payments for order flow from exchange-mandated programs, Insured Bank Deposit Sweep Program fees (“FDIC sweep fees”), minimum activity fees, and other fees and services charged to customers. Fee income is recognized either daily or monthly. See Note 8 for further information on revenue from contracts with customers. Interest Income and Expense The Company earns interest income and incurs interest expense primarily in connection with its electronic brokerage customer business and its securities lending activities, which are recorded on an accrual basis and are included in interest income and interest expense, respectively, in the consolidated statements of comprehensive income. Principal Transactions Principal transactions include gains and losses as a result of changes in the fair value of financial instruments owned, at fair value, financial instruments sold, but not yet purchased, at fair value, and other investments measured at fair value (i.e., unrealized gains and losses) and realized gains and losses related to the Company’s principal transactions. Included are net gains and losses on stocks, options, U.S. and foreign government securities, municipal securities, futures, foreign exchange, precious metals and other derivative instruments, which are reported on a net basis in other income in the consolidated statements of comprehensive income. Dividends are integral to the valuation of stocks. Accordingly, dividend income and expense attributable to financial instruments owned, at fair value and financial instruments sold, but not yet purchased, at fair value, are reported on a net basis in other income in the consolidated statements of comprehensive income. Foreign Currency Gains and Losses Foreign currency balances are assets and liabilities in currencies other than the Company’s functional currency. At every reporting date, the Company revalues its foreign currency balances to its functional currency at the spot exchange rate and records the associated foreign currency gains and losses. These foreign currency gains and losses are reported in the consolidated statements of comprehensive income, as follows: (a) foreign currency gains and losses related to the Company’s currency diversification strategy are reported in other income; (b) foreign currency gains and losses arising from currency swap transactions are reported in interest income or interest expense; and (c) all other foreign currency gains and losses are reported in other income .
Rebates	Rebates Rebates consist of volume discounts, credits, or payments received from exchanges or other market centers related to the placement and/or removal of liquidity from the marketplace and are recorded on an accrual basis. Rebates are recorded net within execution, clearing and distribution fees in the consolidated statements of comprehensive income. Rebates received for trades executed on behalf of customers that elect tiered pricing are passed, in whole or part, to these customers, and such pass-through amounts are recorded net within commissions in the consolidated statements of comprehensive income.
Stock-Based Compensation	Stock - Based Compensation The Company follows FASB ASC Topic 718, “ Compensation - Stock Compensation” (“ASC Topic 718”) , to account for its stock - based compensation plans. ASC Topic 718 requires all share - based payments to employees to be recognized in the consolidated financial statements using a fair value - based method. Grants, which are denominated in U.S. dollars, are communicated to employees in the year of the grant, thereby establishing the fair value of each grant. The fair value of awards granted to employees are generally expensed as follows: 50 % in the year of grant in recognition of the plans’ post-employment provisions (as described below) and the remaining 50 % over the related vesting period utilizing the “graded vesting” method permitted under ASC Topic 718. In the case of “retirement eligible” employees (those employees older than 59), 100 % of awards are expensed when granted. Awards granted under stock - based compensation plans are subject to the plans’ post-employment provisions in the event an employee ceases employment with the Company. The plans provide that employees who discontinue employment with the Company without cause and continue to meet the terms of the plans’ post - employment provisions will be eligible to earn 50 % of previously granted but not yet earned awards, unless the employee is over the age of 59, in which case the employee would be eligible to receive 100 % of previously granted but not yet earned awards.
Income Taxes	Income Taxes The Company accounts for income taxes in accordance with FASB ASC Topic 740, “ Income Taxes” (“ASC Topic 740”) . The Company’s income tax expense, deferred tax assets and liabilities, and reserves for unrecognized tax benefits are based on enacted tax laws (see Note 11) and reflect management’s best assessment of estimated future taxes to be paid. The Company is subject to income taxes in the U.S. and numerous foreign jurisdictions. Determining income tax expense requires significant judgment and estimates. Deferred income tax assets and liabilities arise from temporary differences between the tax and financial statement recognition of underlying assets and liabilities. In evaluating the ability to recover deferred tax assets within the jurisdictions from which they arise, the Company considers all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax - planning strategies and results of recent operations. In projecting future taxable income, historical results are adjusted for changes in accounting policies and incorporate assumptions including the amount of future state, federal and foreign pre-tax operating income, the reversal of temporary differences, and the implementation of feasible and prudent tax - planning strategies. These assumptions require significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates the Company is using to manage the underlying businesses. In evaluating the objective evidence that historical results provide, three years of cumulative operating income (loss) are considered. Deferred income taxes have not been provided for U.S. tax liabilities or for additional foreign taxes on the unremitted earnings of foreign subsidiaries that have been indefinitely reinvested. The calculation of the Company’s tax liabilities involves dealing with uncertainties in the application of complex tax laws and regulations in a multitude of jurisdictions across the Company’s global operations. Changes in tax laws and rates could also affect recorded deferred tax assets and liabilities in the future. On December 15, 2022, the European Union (“EU”) formally adopted the EU’s Pillar Two Directive, effective January 1, 2024, which provides for a minimum effective tax rate of 15%, as established by the Organization for Economic Cooperation and Development (“OECD”) Pillar Two Framework. A significant number of other countries have either already or are expected to also implement similar legislation with varying effective dates. The Company is continuing to evaluate the potential impact of the EU’s Pillar Two Directive and similar legislations adopted by other countries on its future results of operations, financial condition and cash flows. The Company records tax liabilities in accordance with ASC Topic 740 and adjusts these liabilities when management’s judgment changes as a result of the evaluation of new information not previously available. Because of the complexity of some of these uncertainties, the ultimate resolution may result in payments that are different from the current estimates of these tax liabilities. These differences will be reflected as increases or decreases to income tax expense in the period in which new information becomes available. The Company recognizes a tax benefit from an uncertain tax position only when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, on the basis of the technical merits. A tax position that meets this standard is measured at the largest amount of benefit that will more likely than not be realized on settlement. The Company recognizes interest related to income tax matters as interest income or interest expense and penalties related to income tax matters as income tax expense in the consolidated statements of comprehensive income.
Recently Issued Accounting Pronouncements	Standards Adopted During 2023 Standard Summary of guidance Effect on financial statements Business Combinations (Topic 805) Issued October 2021  Requires companies to recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606, “Revenue from Contracts with Customers”. At the acquisition date, the acquirer should account for the related revenue contracts as if it had originated the contracts.  Effective date: January 1, 2023.  The changes did not have a material impact on the Company’s consolidated financial statements. FASB Standards issued but not adopted as of December 31, 2023 Standard Summary of guidance Effect on financial statements Segment Reporting (Topic 280) Issued November 2023  Requires public entities with a single reportable segment to provide all new and existing segment disclosures required by FASB ASC Topic 280, “Segment Reporting”.  Requires public entities to disclose significant segment expenses that are regularly reported to the chief operating decision maker (“CODM”) and included within each measure of segment profit or loss, as well as the title and position of the CODM and an explanation on how the CODM uses segment profit and loss in assessing segment performance.  Effective date: January 1, 2024 and for interim periods effective January 1, 2025.  The Company is currently assessing the impact to its consolidated financial statements. Intangibles - Goodwill and Other - Crypto Assets (Subtopic 350-60) Issued December 2023  Requires companies to subsequently measure crypto assets that meet certain criteria at fair value with changes recognized in net income.  Requires companies to disclose the name, cost basis, fair value, and number of units for each significant crypto asset holding and the aggregate fair values and cost basis of the crypto asset holdings that are not individually significant.  Requires companies to disclose a roll forward, in the aggregate, of activity for crypto asset holdings, including additions dispositions, gains, and losses.  Effective date: January 1, 2025.  The changes are not expected to have a material impact on the Company’s consolidated financial statements. Standard Summary of guidance Summary of guidance Income Taxes (Topic 740) Issued December 2023  Requires companies to disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold.  Requires companies to disclose the amount of income taxes paid disaggregated by federal, state, and foreign taxes and amount of income taxes paid disaggregated by individual jurisdictions in which income taxes paid is equal to or greater than five percent of total income taxes paid.  Requires companies to disclose income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign and income tax expense (or benefit) from continuing operations disaggregated by federal, state, and foreign.  Effective date: January 1, 2025.  The Company is currently assessing the impact to its consolidated financial statements.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Significant Accounting Policies [Abstract]
Schedule Of Securities Segregated For Regulatory Purposes	December 31, 2023 2022 (in millions) U.S. and foreign government securities $ 5,684 $ 4,641 Municipal securities 70 82 Securities purchased under agreements to resell 1 29,632 27,058 $ 35,386 $ 31,781 ___________________________ (1) These balances are collateralized by U.S. government securities.
Composition Of Investment	December 31, 2023 2022 (in millions) Equity method investments 1 $ 142 $ 121 Investments in equity securities at adjusted cost 2 22 16 Investments in equity securities at fair value 2 44 34 Investments in exchange memberships and equity securities of certain exchanges 2 2 2 $ 210 $ 173 ___________________________ (1) The Company’s share of income or losses is included in other income in the consolidated statements of comprehensive income. (2) These investments do not qualify for the equity method of accounting. Dividends received are included in other income in the consolidated statements of comprehensive income.

Equity And Earnings Per Share (

Equity And Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2023
Equity And Earnings Per Share [Abstract]
IBG LLC Ownership of Member Interests	IBG, Inc. Holdings Total Ownership % 25.4 % 74.6 % 100.0 % Membership interests 107,049,483 313,976,354 421,025,837
Earnings Per Share Basic And Diluted	Basic earnings per share is calculated utilizing net income available for common stockholders divided by the weighted average number of shares of Class A and Class B common stock outstanding for that period. Year-Ended December 31, 2023 2022 2021 (in millions, except share or per share amounts) Basic earnings per share Net income available for common stockholders $ 600 $ 380 $ 308 Weighted average shares of common stock outstanding Class A 104,964,950 100,459,916 94,167,472 Class B 100 100 100 104,965,050 100,460,016 94,167,572 Basic earnings per share $ 5.72 $ 3.78 $ 3.27 Diluted earnings per share are calculated utilizing the Company’s basic net income available for common stockholders divided by diluted weighted average shares outstanding with no adjustments to net income available to common stockholders for potentially dilutive common shares. Year-Ended December 31, 2023 2022 2021 (in millions, except share or per share amounts) Diluted earnings per share Net income available for common stockholders $ 600 $ 380 $ 308 Weighted average shares of common stock outstanding Class A Issued and outstanding 104,964,950 100,459,916 94,167,472 Potentially dilutive common shares Issuable pursuant to employee stock incentive plans 881,827 839,593 842,308 Class B 100 100 100 105,846,877 101,299,609 95,009,880 Diluted earnings per share $ 5.67 $ 3.75 $ 3.24

Comprehensive Income (Tables)

Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2023
Comprehensive Income Detail [Abstract]
Comprehensive Income Table	Year-Ended December 31, 2023 2022 2021 (in millions, except share or per share amounts) Comprehensive income available for common stockholders $ 630 $ 354 $ 286 Earnings per share on comprehensive income Basic $ 6.00 $ 3.53 $ 3.04 Diluted $ 5.95 $ 3.50 $ 3.01 Weighted average common shares outstanding Basic 104,965,050 100,460,016 94,167,572 Diluted 105,846,877 101,299,609 95,009,880

Financial Assets And Financia_2

Financial Assets And Financial Liabilities (Tables)	12 Months Ended
	Dec. 31, 2023
Financial Assets And Financial Liabilities [Abstract]
Fair Value Table	Financial Assets at Fair Value as of December 31, 2023 Level 1 Level 2 Level 3 Total (in millions) Securities segregated for regulatory purposes U.S. and foreign government securities $ 5,684 $ — $ — $ 5,684 Municipal securities — 70 — 70 Total securities segregated for regulatory purposes 5,684 70 — 5,754 Financial instruments owned, at fair value Stocks 1,023 — — 1,023 Options 354 — — 354 U.S. and foreign government securities 39 — — 39 Precious metals — 12 — 12 Currency forward contracts — 60 — 60 Total financial instruments owned, at fair value 1,416 72 — 1,488 Other assets Customer-held fractional shares 144 — — 144 Crypto-asset safeguarding asset — 172 — 172 Other investments in equity securities 44 — — 44 Total other assets 188 172 — 360 Total financial assets at fair value $ 7,288 $ 314 $ — $ 7,602 Financial Liabilities at Fair Value as of December 31, 2023 Level 1 Level 2 Level 3 Total (in millions) Financial instruments sold, but not yet purchased, at fair value Stocks $ 77 $ — $ — $ 77 Options 104 — — 104 Precious metals — 7 — 7 Currency forward contracts — 5 — 5 Total financial instruments sold, but not yet purchased, at fair value 181 12 — 193 Accounts payable, accrued expenses and other liabilities Fractional shares repurchase obligation 144 — — 144 Crypto-asset safeguarding liability — 172 — 172 Total accounts payable, accrued expenses and other liabilities 144 172 — 316 Total financial liabilities at fair value $ 325 $ 184 $ — $ 509 Financial Assets at Fair Value as of December 31, 2022 Level 1 Level 2 Level 3 Total (in millions) Securities segregated for regulatory purposes U.S. and foreign government securities $ 4,641 $ — $ — $ 4,641 Municipal securities — 82 — 82 Total securities segregated for regulatory purposes 4,641 82 — 4,723 Financial instruments owned, at fair value Stocks 380 — — 380 Options 31 — — 31 U.S. and foreign government securities 35 — — 35 Precious metals — 9 — 9 Currency forward contracts — 30 — 30 Total financial instruments owned, at fair value 446 39 — 485 Other assets Customer-held fractional shares 91 — — 91 Crypto-asset safeguarding asset — 80 — 80 Other investments in equity securities 34 — — 34 Total other assets 125 80 — 205 Total financial assets at fair value $ 5,212 $ 201 $ — $ 5,413 Financial Liabilities at Fair Value as of December 31, 2022 Level 1 Level 2 Level 3 Total (in millions) Financial instruments sold, but not yet purchased, at fair value Stocks $ 121 $ — $ — $ 121 Options 16 — — 16 Precious metals — 7 — 7 Currency forward contracts — 2 — 2 Total financial instruments sold, but not yet purchased, at fair value 137 9 — 146 Accounts payable, accrued expenses and other liabilities Fractional shares repurchase obligation 91 — — 91 Crypto-asset safeguarding liability — 80 — 80 Total accounts payable, accrued expenses and other liabilities 91 80 — 171 Total financial liabilities at fair value $ 228 $ 89 $ — $ 317
Financial Assets and Liabilities Not Measured at Fair Value	December 31, 2023 Carrying Value Fair Value Level 1 Level 2 Level 3 (in millions) Financial assets, not measured at fair value Cash and cash equivalents $ 3,753 $ 3,753 $ 3,753 $ — $ — Cash - segregated for regulatory purposes 28,840 28,840 28,840 — — Securities - segregated for regulatory purposes 29,632 29,632 — 29,632 — Securities borrowed 5,835 5,835 — 5,835 — Securities purchased under agreements to resell 5,504 5,504 — 5,504 — Receivables from customers 44,472 44,472 — 44,472 — Receivables from brokers, dealers and clearing organizations 1,643 1,643 — 1,643 — Interest receivable 375 375 — 375 — Other assets 22 23 — 2 21 Total financial assets, not measured at fair value $ 120,076 $ 120,077 $ 32,593 $ 87,463 $ 21 Financial liabilities, not measured at fair value Short-term borrowings $ 17 $ 17 $ — $ 17 $ — Securities loaned 11,347 11,347 — 11,347 — Payables to customers 101,012 101,012 — 101,012 — Payables to brokers, dealers and clearing organizations 590 590 — 590 — Interest payable 311 311 — 311 — Total financial liabilities, not measured at fair value $ 113,277 $ 113,277 $ — $ 113,277 $ — December 31, 2022 Carrying Value Fair Value Level 1 Level 2 Level 3 (in millions) Financial assets, not measured at fair value Cash and cash equivalents $ 3,436 $ 3,436 $ 3,436 $ — $ — Cash - segregated for regulatory purposes 25,167 25,167 25,167 — — Securities - segregated for regulatory purposes 27,058 27,058 — 27,058 — Securities borrowed 4,749 4,749 — 4,749 — Securities purchased under agreements to resell 6,029 6,029 — 6,029 — Receivables from customers 38,760 38,760 — 38,760 — Receivables from brokers, dealers and clearing organizations 3,469 3,469 — 3,469 — Interest receivable 341 341 — 341 — Other assets 17 18 — 2 16 Total financial assets, not measured at fair value $ 109,026 $ 109,027 $ 28,603 $ 80,408 $ 16 Financial liabilities, not measured at fair value Short-term borrowings $ 18 $ 18 $ — $ 18 $ — Securities loaned 8,940 8,940 — 8,940 — Payables to customers 93,195 93,195 — 93,195 — Payables to brokers, dealers and clearing organizations 291 291 — 291 — Interest payable 193 193 — 193 — Total financial liabilities, not measured at fair value $ 102,637 $ 102,637 $ — $ 102,637 $ —
Offsetting Assets And Liabilities	. December 31, 2023 Gross Amounts Net Amounts Amounts Not Amounts Offset in the Presented in the Offset in the of Financial Consolidated Consolidated Consolidated Statement Assets and Statement of Statement of of Financial Condition Liabilities Financial Financial Cash or Financial Net Recognized Condition 2 Condition Instruments Amount (in millions) Offsetting of financial assets Securities segregated for regulatory purposes - purchased under agreements to resell $ 29,632 1 $ — $ 29,632 $ ( 29,632 ) $ — Securities borrowed 5,835 — 5,835 ( 5,618 ) 217 Securities purchased under agreements to resell 5,504 — 5,504 ( 5,504 ) — Financial instruments owned, at fair value Options 354 — 354 ( 104 ) 250 Currency forward contracts 60 — 60 — 60 Total $ 41,385 $ — $ 41,385 $ ( 40,858 ) $ 527 (in millions) Offsetting of financial liabilities Securities loaned $ 11,347 $ — $ 11,347 $ ( 10,443 ) $ 904 Financial instruments sold, but not yet purchased, at fair value Options 104 — 104 ( 104 ) — Currency forward contracts 5 — 5 — 5 Total $ 11,456 $ — $ 11,456 $ ( 10,547 ) $ 909 December 31, 2022 Gross Amounts Net Amounts Amounts Not Amounts Offset in the Presented in the Offset in the of Financial Consolidated Consolidated Consolidated Statement Assets and Statement of Statement of of Financial Condition Liabilities Financial Financial Cash or Financial Net Recognized Condition 2 Condition Instruments Amount (in millions) Offsetting of financial assets Securities segregated for regulatory purposes - purchased under agreements to resell $ 27,058 1 $ — $ 27,058 $ ( 27,058 ) $ — Securities borrowed 4,749 — 4,749 ( 4,597 ) 152 Securities purchased under agreements to resell 6,029 — 6,029 ( 6,029 ) — Financial instruments owned, at fair value Options 31 — 31 ( 16 ) 15 Currency forward contracts 30 — 30 — 30 Total $ 37,897 $ — $ 37,897 $ ( 37,700 ) $ 197 (in millions) Offsetting of financial liabilities Securities loaned $ 8,940 $ — $ 8,940 $ ( 8,260 ) $ 680 Financial instruments sold, but not yet purchased, at fair value Options 16 — 16 ( 16 ) — Currency forward contracts 2 — 2 — 2 Total $ 8,958 $ — $ 8,958 $ ( 8,276 ) $ 682 ___________________________ (1) As of December 31 , 2023 and 2022, the Company had $ 29.6 billion and $ 27.1 billion, respectively, of securities purchased under agreements to resell that were segregated to satisfy regulatory requirements. These securities are included in “Securities - segregated for regulatory purposes” in the consolidated statements of financial condition. (2) The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at December 31, 2023 and 2022.
Schedule of Securities Financing Transactions	December 31, 2023 Remaining Contractual Maturity Overnight Less than 30 – 90 Over 90 and Open 30 days days days Total (in millions) Securities loaned Stocks $ 11,306 $ — $ — $ — $ 11,306 Corporate bonds 41 — — — 41 Foreign government securities — — — — — Total securities loaned $ 11,347 $ — $ — $ — $ 11,347 December 31, 2022 Remaining Contractual Maturity Overnight Less than 30 – 90 Over 90 and Open 30 days days days Total (in millions) Securities loaned Stocks $ 8,837 $ — $ — $ — $ 8,837 Corporate bonds 101 — — — 101 Foreign government securities 2 — — — 2 Total securities loaned $ 8,940 $ — $ — $ — $ 8,940

Collateralized Transactions (Ta

Collateralized Transactions (Tables)	12 Months Ended
	Dec. 31, 2023
Disclosure Collateralized Transactions [Abstract]
Amounts Related To Collateralized Transactions	December 31, 2023 December 31, 2022 Permitted Sold or Permitted Sold or to Repledge Repledged to Repledge Repledged (in millions) Securities lending transactions $ 97,210 $ 8,437 $ 62,689 $ 7,055 Securities purchased under agreements to resell transactions 1 35,198 34,825 33,208 31,108 Customer margin assets 54,847 17,234 42,222 17,008 $ 187,255 $ 60,496 $ 138,119 $ 55,171 ___________________________ (1) As of December 31 , 2023, $ 29.6 billion or 85 % (as of December 31, 2022, $ 27.1 billion or 87 %) of securities purchased under agreements to resell were segregated to satisfy regulatory requirements and are included in “Securities - segregated for regulatory purposes” in the consolidated statements of financial condition.
Financial Instruments Owned and Pledged as Collateral (table)	December 31, 2023 2022 (in millions) Stocks $ 28 $ 54 U.S. and foreign government securities 38 35 $ 66 $ 89

Revenue From Contracts With C_2

Revenue From Contracts With Customers (Tables)	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Year-Ended December 31, 2023 2022 2021 (in millions) Geographic location 1 United States $ 968 $ 931 $ 951 International 589 575 617 $ 1,557 $ 1,506 $ 1,568 Major types of services Commissions $ 1,360 $ 1,322 $ 1,350 Market data fees 2 70 76 78 Risk exposure fees 2 46 33 38 Payments for order flow 2 31 37 40 FDIC sweep fees 2 19 10 6 Minimum activity fees 2 4 3 18 Other 2 27 25 38 $ 1,557 $ 1,506 $ 1,568 ___________________________ (1) Based on the location of the subsidiaries in which the revenues are recorded. (2) Included in other fees and services in the consolidated statements of comprehensive income.

Other Income (Loss) (Tables)

Other Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2023
Other Income (Loss) [Abstract]
Schedule Of Components Of Other Income	Year-Ended December 31, 2023 2022 2021 (in millions) Principal transactions $ 48 $ ( 16 ) $ 22 Gains (losses) from currency diversification strategy, net ( 80 ) ( 100 ) ( 37 ) Other, net 21 9 13 $ ( 11 ) $ ( 107 ) $ ( 2 )

Employee Incentive Plans (Table

Employee Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2023
Employee Incentive Plans [Abstract]
Share Grants And Fair Value	Fair Value at Date of Grant Units ($ millions) Prior periods (since inception) 28,247,286 $ 758 December 31, 2021 1,084,773 84 April 25, 2022 180,889 1 12 December 31, 2022 1,248,105 2 91 December 31, 2023 1,256,870 102 Total awards granted since inception 32,017,923 $ 1,047 ___________________________ (1) On April 25, 2022, the Company awarded a special grant of restricted stock units to employees. (2) Stock Incentive Plan number of granted restricted stock units related to 2022 was adjusted by 3,722 additional restricted stock units during the year ended December 31, 2023.
2007 Stock Incentive Plan, ROI Summary	. Intrinsic Value of SIP Shares Stock which Vested and Incentive Plan were Distributed Units ($ millions) 1 Balance, December 31, 2020 4,974,355 Granted 1,084,773 Canceled ( 55,177 ) Distributed ( 1,220,141 ) $ 85 Balance, December 31, 2021 4,783,810 Granted 1,428,994 2 Canceled ( 179,856 ) Distributed ( 1,276,186 ) $ 67 Balance, December 31, 2022 4,756,761 Granted 1,256,870 Canceled ( 20,480 ) Distributed ( 1,389,032 ) $ 108 Balance, December 31, 2023 4,604,119 ___________________________ (1) Intrinsic value of SIP units distributed represents the compensation value reported to the participants. (2) Stock Incentive Plan number of granted restricted stock units related to 2022 was adjusted by 3,722 additional restricted stock units during the year ended December 31, 2023.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Taxes [Abstract]
Schedule Of The Provision For Income Taxes	Year-Ended December 31, 2023 2022 2021 (in millions) Current Federal $ 104 $ 59 $ 62 State and local 14 8 8 Foreign 109 69 58 Total current 227 136 128 Deferred Federal 27 21 15 State and local 4 4 4 Foreign ( 1 ) ( 5 ) 4 Total deferred 30 20 23 $ 257 $ 156 $ 151
Reconciliation Of The Statutory U.S. Federal Income Tax Rate Of 35% To The Company’s Effective Tax Rate	Year-Ended December 31, 2023 2022 2021 U.S. Statutory Tax Rate 21.0 % 21.0 % 21.0 % State, local and foreign taxes, net of federal benefit 2.5 % 2.1 % 3.0 % Subtotal 23.5 % 23.1 % 24.0 % Less: rate attributable to noncontrolling interests ( 15.1 %) ( 15.3 %) ( 15.6 %) Total 8.4 % 7.8 % 8.4 %
Significant Components Of The Company’s Deferred Tax Assets (Liabilities)	December 31, 2023 2022 2021 (in millions) Deferred tax assets Arising from the acquisition of interests in IBG LLC $ 197 $ 193 $ 209 Deferred compensation 17 14 11 Other 31 34 22 Total deferred tax assets 245 241 242 Deferred tax liabilities Foreign 4 2 1 Other 10 7 11 Total deferred tax liabilities 14 9 12 Net deferred tax assets $ 231 $ 232 $ 230

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Supplemental Balance Sheet Information Related To Operating Leases	December 31, 2023 2022 (in millions) Right-of-use assets 1 $ 120 $ 119 Lease liabilities 1 $ 143 $ 140 ___________________________ (1) Right-of-use assets are included in other assets and lease liabilities are included in accounts payable, accrued expenses and other liabilities in the Company’s consolidated statements of financial condition.
Lease Cost	Year-Ended December 31, 2023 2022 2021 (in millions) Operating lease cost $ 35 $ 32 $ 28 Variable lease cost 6 4 5 Total lease cost $ 41 $ 36 $ 33
Undiscounted Cash Flows of Operating Lease	December 31, 2023 (in millions) 2024 $ 34 2025 28 2026 23 2027 18 2028 17 Thereafter 40 Total undiscounted operating lease payments 160 Less: imputed interest ( 17 ) Present value of operating lease liabilities $ 143

Property, Equipment and Intan_2

Property, Equipment and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Equipment and Intangible Assets [Abstract]
Property, Equipment and Intangible Assets	December 31, 2023 2022 (in millions) Leasehold improvements $ 56 $ 51 Computer equipment 90 84 Office furniture and equipment 15 16 161 151 Less - accumulated depreciation and amortization ( 80 ) ( 58 ) Property and equipment, net 81 93 Internally developed software 84 87 Other intangible assets 4 4 Less - accumulated amortization ( 45 ) ( 43 ) Intangible assets, net 43 48 Total property, equipment, and intangible assets, net $ 124 $ 141

Geographic Information (Tables)

Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2023
Geographic Information [Abstract]
Schedule Of Total Net Revenues And Income Before Income Taxes By Geographic Area	Year-Ended December 31, 2023 2022 2021 (in millions) Net revenues United States $ 3,028 $ 2,115 $ 1,881 International 1,312 952 833 Total net revenues $ 4,340 $ 3,067 $ 2,714 Income before income taxes United States $ 2,316 $ 1,546 $ 1,474 International 753 452 313 Total income before income taxes $ 3,069 $ 1,998 $ 1,787

Regulatory Requirements (Tables

Regulatory Requirements (Tables)	12 Months Ended
	Dec. 31, 2023
Regulatory Requirements [Abstract]
Summary Of Capital, Capital Requirements And Excess Capital	Net Capital/ Eligible Equity Requirement Excess (in millions) IB LLC $ 7,319 $ 823 $ 6,496 IBHK 1,265 223 1,042 IBIE 685 189 496 Other regulated operating subsidiaries 2,333 142 2,191 $ 11,602 $ 1,377 $ 10,225

Organization Of Business (Detai

Organization Of Business (Details) - employee	Dec. 31, 2023	May 03, 2007
Number of employees	2,932
IBG LLC [Member]
IBG Inc. ownership % of IBG LLC	25.40%	10%

Significant Accounting Polici_4

Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	May 03, 2007
Significant Accounting Policies [Line Items]
SIP expense - Year of grant			50%
SIP expense - Remaining vesting period			50%
SIP expense - Employees over 59 in year of grant			100%
Percent of shares canceled post employment			50%
Over 59 percent of shares eligible			100%
Fair value of crypto assets held in customers' name	$ 172	$ 80
Bitcoin [Member]
Significant Accounting Policies [Line Items]
Fair value of crypto assets held in customers' name	120
Ethereum [Member]
Significant Accounting Policies [Line Items]
Fair value of crypto assets held in customers' name	50
Other Crypto-Assets [Member]
Significant Accounting Policies [Line Items]
Fair value of crypto assets held in customers' name	$ 2
Maximum [Member]
Significant Accounting Policies [Line Items]
Leases, remaining terms	13 years
Maximum [Member] | Computer Equipment [Member]
Significant Accounting Policies [Line Items]
Property and equipment useful lives	5 years
Maximum [Member] | Office Furniture And Equipment [Member]
Significant Accounting Policies [Line Items]
Property and equipment useful lives	7 years
Maximum [Member] | Internally Developed Software [Member]
Significant Accounting Policies [Line Items]
Intangible assets useful lives	3 years
Maximum [Member] | Finite-Lived Intangible Assets [Member]
Significant Accounting Policies [Line Items]
Intangible assets useful lives	5 years
Minimum [Member]
Significant Accounting Policies [Line Items]
Leases, remaining terms	1 year
Minimum [Member] | Computer Equipment [Member]
Significant Accounting Policies [Line Items]
Property and equipment useful lives	3 years
Minimum [Member] | Office Furniture And Equipment [Member]
Significant Accounting Policies [Line Items]
Property and equipment useful lives	5 years
Minimum [Member] | Finite-Lived Intangible Assets [Member]
Significant Accounting Policies [Line Items]
Intangible assets useful lives	3 years

Significant Accounting Polici_5

Significant Accounting Policies (Schedule Of Securities Segregated For Regulatory Purposes) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Marketable Securities [Line Items]
Securities - segregated for regulatory purposes		$ 35,386	$ 31,781
US And Foreign Government Securities [Member]
Marketable Securities [Line Items]
Securities - segregated for regulatory purposes		5,684	4,641
Municipal Securities [Member]
Marketable Securities [Line Items]
Securities - segregated for regulatory purposes		70	82
Securities Purchased Under Agreement To Resell [Member]
Marketable Securities [Line Items]
Securities - segregated for regulatory purposes	[1]	$ 29,632	$ 27,058
[1] These balances are collateralized by U.S. government securities.

Significant Accounting Polici_6

Significant Accounting Policies (Components Of Investments) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Significant Accounting Policies [Abstract]
Equity method investments	[1]	$ 142	$ 121
Investment in equity securities at adjusted cost	[2]	22	16
Investments in equity securities at fair value	[2]	44	34
Investments in exchange memberships and equity securities of certain exchanges	[2]	2	2
Total investments		$ 210	$ 173
[1] The Company’s share of income or losses is included in other income in the consolidated statements of comprehensive income. These investments do not qualify for the equity method of accounting. Dividends received are included in other income in the consolidated statements of comprehensive income.

Equity And Earnings Per Share_2

Equity And Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	12 Months Ended			36 Months Ended	60 Months Ended	144 Months Ended	200 Months Ended
	Jul. 27, 2023	Jul. 26, 2023	Jan. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2010	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	May 03, 2007
Equity And Earnings Per Share [Line Items]
IBG Holdings Redemption of IBG LLC											10%
IBG Holdings LLC Ownership Percentage of Class B Common Stock											100%
Preferred stock shares authorized				10,000	10,000			10,000	10,000	10,000
Preferred stock shares issued				0	0			0	0	0
Preferred stock shares outstanding				0	0			0	0	0
Amortization period DTA (years)				15 years
Unamortized deferred tax asset arising from equity offerings				$ 197	$ 193			$ 197	$ 193	$ 197
Percent of tax savings owed to IBG Holdings LLC				85%
Percentage of tax savings retained by IBG Inc.				15%
Deferred tax asset from common stock offerings				$ 682				$ 682		682
Tax savings owed to IBG Holdings LLC										580
Tax savings retained by IBG Inc.										102
Tax savings paid to IBG Holdings LLC										$ 268
Shares reserved for future issuance											360,000,000
Shares redeemed by IBG Holdings from IBG LLC							5,013,259
Cash Redemptions IBG Holdings							$ 114
Fair Value of Issued Shares in Exchange for Membership Interests	$ 229								$ 1,700
Stock registered, number of common stock		630,000
Shares Issued	2,632,748							420,000	37,478,697
Thomas Peterffy and Affiliates Ownership				91.30%				91.30%		91.30%	84.60%
Distribution from IBG LLC				$ 741	533	$ 489
Cash distribution to IBG, Inc.				$ 185	$ 128	$ 112
Dividend per share				$ 0.10	$ 0.10	$ 0.10
Dividends paid to common shareholders				$ 42	$ 40	$ 38
Declaration Date				Jan. 16, 2024
Payment Date				Mar. 14, 2024
Record Date				Mar. 01, 2024
Subsequent Event [Member]
Equity And Earnings Per Share [Line Items]
Shares Issued			50,000
IBG LLC [Member]
Equity And Earnings Per Share [Line Items]
IBG Inc. ownership % of IBG LLC				25.40%				25.40%		25.40%	10%
IBG Holdings ownership % of IBG LLC				74.60%				74.60%		74.60%	90%
Common Class A [Member]
Equity And Earnings Per Share [Line Items]
Common stock, par value				$ 0.01	$ 0.01			$ 0.01	$ 0.01	$ 0.01
Shares authorized				1,000,000,000	1,000,000,000			1,000,000,000	1,000,000,000	1,000,000,000
Common stock, shares issued				107,178,928	103,057,148			107,178,928	103,057,148	107,178,928
Common stock, shares outstanding				107,045,894	102,887,728			107,045,894	102,887,728	107,045,894
Common Class B [Member]
Equity And Earnings Per Share [Line Items]
Common stock, par value				$ 0.01	$ 0.01			$ 0.01	$ 0.01	$ 0.01
Shares authorized				100	100			100	100	100
Common stock, shares issued				100	100			100	100	100
Common stock, shares outstanding				100	100			100	100	100

Equity And Earnings Per Share_3

Equity And Earnings Per Share (IBG LLC Ownership of Member Interests) (Details)	Dec. 31, 2023 shares
Ownership Percentage	100%
Membership Interests	421,025,837
IBG Inc [Member]
Ownership Percentage	25.40%
Membership Interests	107,049,483
Holdings [Member]
Ownership Percentage	74.60%
Membership Interests	313,976,354

Equity And Earnings Per Share_4

Equity And Earnings Per Share (Basic Table) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic earnings per share:
Net income available for common stockholders	$ 600	$ 380	$ 308
Weighted average shares of common stock outstanding:
Weighted Average Number of Shares Outstanding, Basic	104,965,050	100,460,016	94,167,572
Basic earnings per share	$ 5.72	$ 3.78	$ 3.27
Common Class A [Member]
Weighted average shares of common stock outstanding:
Weighted Average Number of Shares Outstanding, Basic	104,964,950	100,459,916	94,167,472
Common Class B [Member]
Weighted average shares of common stock outstanding:
Weighted Average Number of Shares Outstanding, Basic	100	100	100

Equity And Earnings Per Share_5

Equity And Earnings Per Share (Diluted Table) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Diluted earnings per share:
Net income available for common stockholders	$ 600	$ 380	$ 308
Weighted Average Shares Outstanding [Abstract]
Weighted Average Number of Shares Outstanding, Basic	104,965,050	100,460,016	94,167,572
Potentially dilutive common shares:
Issuable pursuant to employee incentive plans	881,827	839,593	842,308
Weighted Average Number of Shares Outstanding, Diluted	105,846,877	101,299,609	95,009,880
Earnings Per Share, Diluted	$ 5.67	$ 3.75	$ 3.24
Common Class A [Member]
Weighted Average Shares Outstanding [Abstract]
Weighted Average Number of Shares Outstanding, Basic	104,964,950	100,459,916	94,167,472
Common Class B [Member]
Weighted Average Shares Outstanding [Abstract]
Weighted Average Number of Shares Outstanding, Basic	100	100	100

Comprehensive Income (Details)

Comprehensive Income (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Comprehensive Income Detail [Abstract]
Comprehensive income available for common stockholders	$ 630	$ 354	$ 286
Earnings per share on comprehensive income:
Basic	$ 6	$ 3.53	$ 3.04
Diluted	$ 5.95	$ 3.50	$ 3.01
Weighted average common shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	104,965,050	100,460,016	94,167,572
Weighted Average Number of Shares Outstanding, Diluted	105,846,877	101,299,609	95,009,880

Financial Assets And Financia_3

Financial Assets And Financial Liabilities (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financial Assets And Financial Liabilities [Abstract]
Transfers in and/or out of Level 3	$ 0
Securities purchased under agreement to resell segregated for regulatory purposes	$ 29,600,000,000	$ 27,100,000,000

Financial Assets And Financia_4

Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities segregated for regulatory purposes	$ 5,754	$ 4,723
Total financial instruments owned, at fair value	1,488	485
Other assets	360	205
Total financial assets at fair value	7,602	5,413
Financial instruments sold, not yet purchased, at fair value	193	146
Accounts payable, accrued expenses and other liabilities	316	171
Total Financial Liabilities at Fair Value	509	317
US And Foreign Government Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities segregated for regulatory purposes	5,684	4,641
Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities segregated for regulatory purposes	70	82
Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial instruments owned, at fair value	1,023	380
Financial instruments sold, not yet purchased, at fair value	77	121
Options Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial instruments owned, at fair value	354	31
Financial instruments sold, not yet purchased, at fair value	104	16
U.S. And Foreign Government Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial instruments owned, at fair value	39	35
Customer-Held Fractional Shares [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	144	91
Crypto-Asses Safeguarding Asset [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	172	80
Other Investments In Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	44	34
Fractional Shares Repurchase Obligation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts payable, accrued expenses and other liabilities	144	91
Crypto-Assets Safeguarding Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts payable, accrued expenses and other liabilities	172	80
Precious Metals [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial instruments owned, at fair value	12	9
Financial instruments sold, not yet purchased, at fair value	7	7
Currency Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial instruments owned, at fair value	60	30
Financial instruments sold, not yet purchased, at fair value	5	2
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities segregated for regulatory purposes	5,684	4,641
Total financial instruments owned, at fair value	1,416	446
Other assets	188	125
Total financial assets at fair value	7,288	5,212
Financial instruments sold, not yet purchased, at fair value	181	137
Accounts payable, accrued expenses and other liabilities	144	91
Total Financial Liabilities at Fair Value	325	228
Level 1 [Member] | US And Foreign Government Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities segregated for regulatory purposes	5,684	4,641
Level 1 [Member] | Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial instruments owned, at fair value	1,023	380
Financial instruments sold, not yet purchased, at fair value	77	121
Level 1 [Member] | Options Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial instruments owned, at fair value	354	31
Financial instruments sold, not yet purchased, at fair value	104	16
Level 1 [Member] | U.S. And Foreign Government Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial instruments owned, at fair value	39	35
Level 1 [Member] | Customer-Held Fractional Shares [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	144	91
Level 1 [Member] | Other Investments In Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	44	34
Level 1 [Member] | Fractional Shares Repurchase Obligation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts payable, accrued expenses and other liabilities	144	91
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities segregated for regulatory purposes	70	82
Total financial instruments owned, at fair value	72	39
Other assets	172	80
Total financial assets at fair value	314	201
Financial instruments sold, not yet purchased, at fair value	12	9
Accounts payable, accrued expenses and other liabilities	172	80
Total Financial Liabilities at Fair Value	184	89
Level 2 [Member] | Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities segregated for regulatory purposes	70	82
Level 2 [Member] | Crypto-Asses Safeguarding Asset [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	172	80
Level 2 [Member] | Crypto-Assets Safeguarding Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts payable, accrued expenses and other liabilities	172	80
Level 2 [Member] | Precious Metals [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial instruments owned, at fair value	12	9
Financial instruments sold, not yet purchased, at fair value	7	7
Level 2 [Member] | Currency Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial instruments owned, at fair value	60	30
Financial instruments sold, not yet purchased, at fair value	$ 5	$ 2

Financial Assets And Financia_5

Financial Assets And Financial Liabilities (Level 3 Financial Liabilities) (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)
Financial Liabilities Level 3 Rollforward [Abstract]
Transfers in and/or out of Level 3 (Liabilities)	$ 0

Financial Assets And Financia_6

Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash and cash equivalents	$ 3,753	$ 3,436	$ 2,395
Cash segregated for regulatory purposes	28,840	25,167	$ 22,888
Securities - segregated for regulatory purposes	35,386	31,781
Securities borrowed	5,835	4,749
Securities purchased under agreements to resell	5,504	6,029
Receivables from customers	44,472	38,760
Brokers, dealers and clearing organizations	1,643	3,469
Interest Receivable	375	341
Other assets	1,127	926
Short-term borrowings	17	18
Securities loaned	11,347	8,940
Customers	101,012	93,195
Brokers, dealers and clearing organizations	590	291
Interest	311	193
at Fair Value
Cash and cash equivalents	3,753	3,436
Cash segregated for regulatory purposes	28,840	25,167
Securities - segregated for regulatory purposes	29,632	27,058
Securities borrowed	5,835	4,749
Securities purchased under agreements to resell	5,504	6,029
Receivables from customers	44,472	38,760
Brokers, dealers and clearing organizations	1,643	3,469
Interest Receivable	375	341
Other assets	23	18
Total financial assets, not measured at fair value	120,077	109,027
Short-term borrowings	17	18
Securities loaned	11,347	8,940
Customers	101,012	93,195
Brokers, dealers and clearing organizations	590	291
Interest	311	193
Total financial liabilities, not measured at fair value	113,277	102,637
Carrying Value
Cash and cash equivalents	3,753	3,436
Cash segregated for regulatory purposes	28,840	25,167
Securities - segregated for regulatory purposes	29,632	27,058
Securities borrowed	5,835	4,749
Securities purchased under agreements to resell	5,504	6,029
Receivables from customers	44,472	38,760
Brokers, dealers and clearing organizations	1,643	3,469
Interest Receivable	375	341
Other assets	22	17
Total financial assets, not measured at fair value	120,076	109,026
Short-term borrowings	17	18
Securities loaned	11,347	8,940
Customers	101,012	93,195
Brokers, dealers and clearing organizations	590	291
Interest	311	193
Total financial liabilities, not measured at fair value	113,277	102,637
Level 1 [Member]
Cash and cash equivalents	3,753	3,436
Cash segregated for regulatory purposes	28,840	25,167
Total financial assets, not measured at fair value	32,593	28,603
Short-term borrowings
Securities loaned
Customers
Brokers, dealers and clearing organizations
Interest
Total financial liabilities, not measured at fair value
Level 2 [Member]
Securities - segregated for regulatory purposes	29,632	27,058
Securities borrowed	5,835	4,749
Securities purchased under agreements to resell	5,504	6,029
Receivables from customers	44,472	38,760
Brokers, dealers and clearing organizations	1,643	3,469
Interest Receivable	375	341
Other assets	2	2
Total financial assets, not measured at fair value	87,463	80,408
Short-term borrowings	17	18
Securities loaned	11,347	8,940
Customers	101,012	93,195
Brokers, dealers and clearing organizations	590	291
Interest	311	193
Total financial liabilities, not measured at fair value	113,277	102,637
Level 3 [Member]
Cash and cash equivalents
Cash segregated for regulatory purposes
Securities - segregated for regulatory purposes
Securities borrowed
Securities purchased under agreements to resell
Receivables from customers
Brokers, dealers and clearing organizations
Interest Receivable
Other assets	21	16
Total financial assets, not measured at fair value	21	16
Short-term borrowings
Securities loaned
Customers
Brokers, dealers and clearing organizations
Interest
Total financial liabilities, not measured at fair value

Financial Assets And Financia_7

Financial Assets And Financial Liabilities (Netting of Financial Assets) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Securities, Segregated For Regulatory Purposes, Purchased Under Agreements To Resell [Abstract]
Gross Amounts of Financial Assets Recognized	[1]	$ 29,632	$ 27,058
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		29,632	27,058
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments		(29,632)	(27,058)
Net Amount
Offsetting Securities Borrowed [Abstract]
Gross Amounts of Financial Assets Recognized		5,835	4,749
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		5,835	4,749
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments		(5,618)	(4,597)
Net Amount		217	152
Offsetting Securities Purchased under Agreements to Resell [Abstract]
Gross Amounts of Financial Assets Recognized		5,504	6,029
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		5,504	6,029
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments		(5,504)	(6,029)
Net Amount
Total [Abstract]
Gross Amounts of Financial Assets Recognized		41,385	37,897
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		41,385	37,897
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments		(40,858)	(37,700)
Net Amount		527	197
Options [Member]
Offsetting Financial Instruments Owned, At Fair Value [Abstract]
Gross Amounts of Financial Assets Recognized		354	31
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		354	31
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments		(104)	(16)
Net Amount		250	15
Currency Forward Contracts [Member]
Offsetting Financial Instruments Owned, At Fair Value [Abstract]
Gross Amounts of Financial Assets Recognized		60	30
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		60	30
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments
Net Amount		$ 60	$ 30
[1] As of December 31 , 2023 and 2022, the Company had $ 29.6 billion and $ 27.1 billion, respectively, of securities purchased under agreements to resell that were segregated to satisfy regulatory requirements. These securities are included in “Securities - segregated for regulatory purposes” in the consolidated statements of financial condition. The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at December 31, 2023 and 2022.

Financial Assets And Financia_8

Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Offsetting Securities Loaned [Abstract]
Gross Amounts of Financial Assets Recognized		$ 11,347	$ 8,940
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		11,347	8,940
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments)		(10,443)	(8,260)
Net Amount		904	680
Total [Abstract]
Gross Amounts of Financial Assets Recognized		11,456	8,958
Amounts Offset in the Consolidated Statement of Financial Condition	[1]
Net Amounts Presented in the Consolidated Statement of Financial Condition		11,456	8,958
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments)		(10,547)	(8,276)
Net Amount		909	682
Options [Member]
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]
Gross Amounts of Financial Assets Recognized		104	16
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		104	16
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments)		(104)	(16)
Net Amount
Currency Forward Contracts [Member]
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]
Gross Amounts of Financial Assets Recognized		5	2
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		5	2
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments)
Net Amount		$ 5	$ 2
[1] The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at December 31, 2023 and 2022.

Financial Assets And Financia_9

Financial Assets And Financial Liabilities (Secured Financing Transactions) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities loaned	$ 11,347	$ 8,940
Foreign Government Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities loaned		2
Overnight and Open [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities loaned	11,347	8,940
Overnight and Open [Member] | Foreign Government Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities loaned		2
Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities loaned	11,306	8,837
Common Stock [Member] | Overnight and Open [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities loaned	11,306	8,837
Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities loaned	41	101
Corporate Bonds [Member] | Overnight and Open [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities loaned	$ 41	$ 101

Collateralized Transactions (Na

Collateralized Transactions (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure Collateralized Transactions [Abstract]
Customers receivables	$ 44,472	$ 38,760
Securities purchased under agreement to resell segregated for regulatory purposes	$ 29,600	$ 27,100
Percentage of securities repledged and deposited for customers	85%	87%

Collateralized Transactions (Am

Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Permitted To Repledge [Member]
Collateralized Transactions [Line Items]
Securities lending transactions		$ 97,210	$ 62,689
Agreements to resell	[1]	35,198	33,208
Customer margin assets		54,847	42,222
Total collateralized transactions		187,255	138,119
Sold Or Repledged [Member]
Collateralized Transactions [Line Items]
Securities lending transactions		8,437	7,055
Agreements to resell	[1]	34,825	31,108
Customer margin assets		17,234	17,008
Total collateralized transactions		$ 60,496	$ 55,171
[1] As of December 31 , 2023, $ 29.6 billion or 85 % (as of December 31, 2022, $ 27.1 billion or 87 %) of securities purchased under agreements to resell were segregated to satisfy regulatory requirements and are included in “Securities - segregated for regulatory purposes” in the consolidated statements of financial condition.

Collateralized Transactions (Fi

Collateralized Transactions (Financial instruments owned and pledged where the counterparty has the right to repledge) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total financial instruments owned, at fair value	$ 1,488	$ 485
Asset Pledged as Collateral with Right [Member] | Affiliated Entity [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Stocks	28	54
U.S. and foreign government securities	38	35
Total financial instruments owned, at fair value	$ 66	$ 89

Revenue From Contracts With C_3

Revenue From Contracts With Customers (Narrative) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Receivables	$ 26,000,000	$ 17,000,000
Contract assets	0	0
Contract liabilities	$ 0	$ 0

Revenue From Contracts With C_4

Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	$ 1,557	$ 1,506	$ 1,568
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	968	931	951
International [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	589	575	617
Commissions [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,360	1,322	1,350
Market Data Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[2]	70	76	78
Risk Exposure Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[2]	46	33	38
Payments For Order Flow [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[2]	31	37	40
FDIC Sweep Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[2]	19	10	6
Minimum Activity Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[2]	4	3	18
Others [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[2]	$ 27	$ 25	$ 38
[1] Based on the location of the subsidiaries in which the revenues are recorded. Included in other fees and services in the consolidated statements of comprehensive income.

Other Income (Loss) (Schedule O

Other Income (Loss) (Schedule Of Components Of Other Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Income (Loss) [Abstract]
Principal transactions	$ 48	$ (16)	$ 22
Gains (losses) from currency diversification strategy, net	(80)	(100)	(37)
Other, net	21	9	13
Other income (loss)	$ (11)	$ (107)	$ (2)

Employee Incentive Plans (Narra

Employee Incentive Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended			200 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023	Feb. 28, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	50%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	10%
Defined Contribution Plan Vesting Period	6 years
401(k) plan contribution expense	$ 7	$ 6	$ 5
Maximum shares of stock distributable under 2007 Stock Incentive Plan	40,000,000			40,000,000	30,000,000
Shares granted to external directors				39,025
2007 Stock Incentive Plan Compensation Expense	$ 100	$ 92	$ 80
Estimated Future 2007 Stock Incentive Plan Compensation Expense	$ 42			$ 42
Post employment shares distribution				1,320,900
2007 Stock Incentive Plan (Shares) | Vesting And Distribution Of Grants Prior To December 31, 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, description	10% on the first vesting date, which is on or about May 9 of each year; and (b) an additional 15% on each of the following six anniversaries of the first vesting.
2007 Stock Incentive Plan (Shares) | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, description	In 2021, the Company’s Compensation Committee approved a change to the vesting schedule for the Stock Incentive Plan. For awards granted on December 31, 2021 onwards, restricted stock units vest and become distributable to participants 20% on each vesting date
2007 Stock Incentive Plan (Shares) | External Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, description	annual awards granted to all directors on December 31 of each year are fully vested and distributed immediately on grant date.
Vesting period	5 years
2007 Stock Incentive Plan (Shares) | External Director [Member] | Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage per year	20%

Employee Incentive Plans (Share

Employee Incentive Plans (Share Grants And Fair Value) (Details) - USD ($) $ in Millions			12 Months Ended				164 Months Ended	200 Months Ended
	Apr. 25, 2022		Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2023
Employee Incentive Plans [Abstract]
Shares granted	180,889	[1]	1,256,870	1,248,105	[2]	1,084,773	28,247,286	32,017,923
Fair Value - Date of Grant	$ 12		$ 102	$ 91		$ 84	$ 758	$ 1,047
Stock Incentive Plan Granted Shares Adjustment			3,722	3,722
[1] On April 25, 2022, the Company awarded a special grant of restricted stock units to employees. Stock Incentive Plan number of granted restricted stock units related to 2022 was adjusted by 3,722 additional restricted stock units during the year ended December 31, 2023.

Employee Incentive Plans (2007

Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Employee Incentive Plans [Abstract]
Beginning Balance		4,756,761	4,783,810		4,974,355
Shares Granted		1,256,870	1,428,994	[1]	1,084,773
Shares Canceled		(20,480)	(179,856)		(55,177)
Shares Distributed		(1,389,032)	(1,276,186)		(1,220,141)
Ending Balance		4,604,119	4,756,761		4,783,810
Distributed	[2]	$ 108	$ 67		$ 85
Stock Incentive Plan Granted Shares Adjustment		3,722	3,722
[1] Stock Incentive Plan number of granted restricted stock units related to 2022 was adjusted by 3,722 additional restricted stock units during the year ended December 31, 2023. Intrinsic value of SIP units distributed represents the compensation value reported to the participants.

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Abstract]
U.S. Statutory Tax Rate	21%	21%	21%
Valuation allowance on deferred tax assets	$ 0	$ 0
Undistributed accumulated earnings of foreign subsidiaries	2,700,000,000	$ 1,900,000,000
Earnings, Indefinitely Reinvested Abroad Due To Regulatory And Other Capital Requirements	2,400,000,000
Estimated Deferred Tax Liablity Due To Hypothetical Repatriation Of Earnings	16,000,000
Liability for Uncertainty in Income Taxes	$ 2,000,000

Income Taxes (Schedule Of The P

Income Taxes (Schedule Of The Provision For Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 104	$ 59	$ 62
State and local	14	8	8
Foreign	109	69	58
Total current	227	136	128
Deferred:
Federal	27	21	15
State and local	4	4	4
Foreign	(1)	(5)	4
Total deferred	30	20	23
Income tax expense	$ 257	$ 156	$ 151

Income Taxes (Reconciliation Of

Income Taxes (Reconciliation Of The Statutory U.S. Federal Income Tax Rate Of 35% To The Company’s Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Abstract]
U.S. Statutory Tax Rate	21%	21%	21%
State, local and foreign taxes, net of federal benefit	2.50%	2.10%	3%
Subtotal	23.50%	23.10%	24%
Less: rate attributable to noncontrolling interests	(15.10%)	(15.30%)	(15.60%)
Effective income tax rate	8.40%	7.80%	8.40%

Income Taxes (Significant Compo

Income Taxes (Significant Components Of The Company’s Deferred Tax Assets (Liabilities)) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Deferred tax asset arising from the acquisition of interests in IBGLLC	$ 197	$ 193	$ 209
Deferred compensation	17	14	11
Other	31	34	22
Total deferred tax assets	245	241	242
Deferred tax liabilities:
Foreign	4	2	1
Other	10	7	11
Total deferred tax liabilities	14	9	12
Net deferred tax assets	$ 231	$ 232	$ 230

Leases (Narrative) (Details)

Leases (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Leases [Abstract]
Operating lease, weighted-average remaining lease term	6 years
Operating lease, weighted-average discount rate	3.73%
Right-of-use assets obtained in exchange for operating lease liabilities	$ 28

Leases (Supplemental Balance Sh

Leases (Supplemental Balance Sheet Information Related To Operating Leases) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Right-of-use assets	[1]	$ 120	$ 119
Lease liabilities	[1]	$ 143	$ 140
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets	Other Assets
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]		Accounts payable, accrued expenses and other liabilities	Accounts payable, accrued expenses and other liabilities
[1] Right-of-use assets are included in other assets and lease liabilities are included in accounts payable, accrued expenses and other liabilities in the Company’s consolidated statements of financial condition.

Leases (Lease Cost) (Details)

Leases (Lease Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease cost	$ 35	$ 32	$ 28
Variable lease cost	6	4	5
Total lease cost	$ 41	$ 36	$ 33

Leases (Undiscounted Cash Flows

Leases (Undiscounted Cash Flows of Operating Lease) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
2024		$ 34
2025		28
2026		23
2027		18
2028		17
Thereafter		40
Total undiscounted operating lease payments		160
Less: imputed interest		(17)
Present value of operating lease liabilities	[1]	$ 143	$ 140
[1] Right-of-use assets are included in other assets and lease liabilities are included in accounts payable, accrued expenses and other liabilities in the Company’s consolidated statements of financial condition.

Property, Equipment and Intan_3

Property, Equipment and Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Equipment and Intangible Assets [Abstract]
Depreciation and amortization	$ 65	$ 58	$ 50
Expected amortization expense, 2024	24
Expected amortization expense, 2025	15
Expected amortization expense, 2026	$ 4

Property, Equipment and Intan_4

Property, Equipment and Intangible Assets (Property And Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Property, Equipment and Intangible Assets [Abstract]
Leasehold improvements	$ 56	$ 51
Computer equipment	90	84
Office furniture and equipment	15	16
Property and equipment, gross	161	151
Less—accumulated depreciation and amortization	(80)	(58)
Property and equipment, net	81	93
Internally developed software	84	87
Other intangible assets	4	4
Less-accumulated amortization	(45)	(43)
Intangible assets, net	43	48
Total property equipment and intangible assets, net	$ 124	$ 141

Commitments, Contingencies an_2

Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($)				1 Months Ended
	Sep. 29, 2023	Jan. 11, 2022	Sep. 07, 2021	Mar. 31, 2022	Dec. 31, 2023
Commitment And Contingencies [Line Items]
Guarantees, Fair Value Disclosure					$ 0
Trading Technologies Matter [Member]
Commitment And Contingencies [Line Items]
Damages sought			$ 962,400,000
Damage awarded		$ 2,100,000	$ 6,600,000	$ 490,232
SEC [Member]
Commitment And Contingencies [Line Items]
Settlement, penalties agreed to paid	$ 35,000,000
CFTC [Member]
Commitment And Contingencies [Line Items]
Settlement, penalties agreed to paid	$ 20,000,000

Geographic Information (Geograp

Geographic Information (Geographic Table) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total net revenues	$ 4,340	$ 3,067	$ 2,714
Income before income taxes	3,069	1,998	1,787
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	3,028	2,115	1,881
Income before income taxes	2,316	1,546	1,474
International [Member]
Segment Reporting Information [Line Items]
Total net revenues	1,312	952	833
Income before income taxes	$ 753	$ 452	$ 313

Regulatory Requirements (Narrat

Regulatory Requirements (Narrative) (Details) $ in Millions	Dec. 31, 2023 USD ($)
Regulatory Requirements [Abstract]
Excess	$ 10,225

Regulatory Requirements (Summar

Regulatory Requirements (Summary Of Capital, Capital Requirements And Excess Capital) (Details) $ in Millions	Dec. 31, 2023 USD ($)
Net Capital / Eligible Equity	$ 11,602
Requirement	1,377
Excess	10,225
IB LLC [Member]
Net Capital / Eligible Equity	7,319
Requirement	823
Excess	6,496
IBHK [Member]
Net Capital / Eligible Equity	1,265
Requirement	223
Excess	1,042
IBIE [Member]
Net Capital / Eligible Equity	685
Requirement	189
Excess	496
Other Regulated Operating Companies [Member]
Net Capital / Eligible Equity	2,333
Requirement	142
Excess	$ 2,191

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Due to Affiliate	$ 210	$ 214
Directors, Officers, And Affiliates [Member]
Related Party Transaction [Line Items]
Due from Related Parties - Customers	6	17
Due to Affiliate	$ 985	$ 1,208

Senior Notes Payable (Details)

Senior Notes Payable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Senior Notes Payable [Abstract]
Issue price per note	$ 1,000
Redemption price percent	100%
Issuance of senior notes	$ 0	$ 0	$ 1,428,000,000
Redemptions of senior notes			1,524,000,000
Notes payable	0	0
Interest expense on short-term borrowings	$ 0	$ 0	$ 1,000,000

Schedule I - Condensed Financ_2

Schedule I - Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Financial Conditions) (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 3,753	$ 3,436	$ 2,395
Total assets	128,423	115,143
Liabilities and stockholders' equity
Accrued expenses and other liabilities	676	531
Total liabilities	114,356	103,528
Stockholders’ equity:
Additional paid-in capital	1,726	1,581
Retained earnings	1,852	1,294
Accumulated other comprehensive income, net of income taxes of $0 and $0 as of December 31, 2023 and 2022	8	(22)
Treasury stock, at cost, 133,034 and 169,420 shares as of December 31, 2023 and 2022	(3)	(6)
Total stockholders' equity	3,584	2,848
Total liabilities and stockholders' equity	128,423	115,143
Accumulated other comprehensive income tax	$ 0	$ 0
Treasury stock shares	133,034	169,420
Common Class A [Member]
Stockholders’ equity:
Common stock, $0.01 par value per share	$ 1	$ 1
Common stock, par value	$ 0.01	$ 0.01
Shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	107,178,928	103,057,148
Common stock, shares outstanding	107,045,894	102,887,728
Common Class B [Member]
Stockholders’ equity:
Common stock, $0.01 par value per share
Common stock, par value	$ 0.01	$ 0.01
Shares authorized	100	100
Common stock, shares issued	100	100
Common stock, shares outstanding	100	100
Parent Company [Member]
Assets
Cash and cash equivalents	$ 6	$ 1		$ 4
Investments in subsidiaries, equity basis	3,571	2,845
Other assets	230	231
Total assets	3,807	3,077
Liabilities and stockholders' equity
Payable to affiliates	209	214
Accrued expenses and other liabilities	14	15
Total liabilities	223	229
Stockholders’ equity:
Additional paid-in capital	1,726	1,581
Retained earnings	1,852	1,294
Accumulated other comprehensive income, net of income taxes of $0 and $0 as of December 31, 2023 and 2022	8	(22)
Treasury stock, at cost, 133,034 and 169,420 shares as of December 31, 2023 and 2022	(3)	(6)
Total stockholders' equity	3,584	2,848
Total liabilities and stockholders' equity	3,807	3,077
Accumulated other comprehensive income tax	$ 0	$ 0
Treasury stock shares	133,034	169,420
Parent Company [Member] | Common Class A [Member]
Stockholders’ equity:
Common stock, $0.01 par value per share	$ 1	$ 1
Common stock, par value	$ 0.01	$ 0.01
Shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	107,178,928	103,057,148
Common stock, shares outstanding	107,045,994	102,887,728
Parent Company [Member] | Common Class B [Member]
Stockholders’ equity:
Common stock, $0.01 par value per share
Common stock, par value	$ 0.01	$ 0.01
Shares authorized	100	100
Common stock, shares issued	100	100
Common stock, shares outstanding	100	100

Schedule I - Condensed Financ_3

Schedule I - Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income tax expense	$ 257	$ 156	$ 151
Net income	2,812	1,842	1,636
Net income available to common stockholders	600	380	308
Comprehensive income available for common stockholders	630	354	286
Parent Company [Member]
Undistributed gains of subsidiaries, net	5	4
Undistributed gains of subsidiaries, net	737	463	383
Income tax expense	142	87	75
Net income	600	380	308
Net income available to common stockholders	600	380	308
Cumulative translation adjustment, net of tax	30	(26)	(22)
Comprehensive income available for common stockholders	$ 630	$ 354	$ 286

Schedule I - Condensed Financ_4

Schedule I - Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income	$ 2,812	$ 1,842	$ 1,636
Deferred income taxes	30	20	23
(Gain) loss on remeasurement of Tax Receivable Agreement liability	(7)	(6)	(1)
Net cash provided by operating activities	4,544	3,968	5,896
Cash flows provided by investing activities	(52)	(67)	(188)
Cash flows used in financing activities	(624)	(470)	(523)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	122	(111)	(97)
Net increase in cash, cash equivalents and restricted cash	3,990	3,320	5,088
Cash, cash equivalents, and restricted cash at beginning of period	3,436	2,395
Cash, cash equivalents, and restricted cash at end of period	3,753	3,436	2,395
Cash paid for interest	3,317	833	222
Cash paid for taxes, net	228	148	114
Parent Company [Member]
Net income	600	380	308
Undistributed gains of subsidiaries, net	(737)	(463)	(383)
Deferred income taxes	34	28	18
(Gain) loss on remeasurement of Tax Receivable Agreement liability	(7)	(6)	(1)
Changes in operating assets and liabilities	(33)	20	21
Net cash provided by operating activities	(143)	(41)	(37)
Cash flows provided by investing activities	185	127	111
Cash flows used in financing activities	(67)	(59)	(56)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	30	(26)	(22)
Net increase in cash, cash equivalents and restricted cash	5	1	(4)
Cash, cash equivalents, and restricted cash at beginning of period	1		4
Cash, cash equivalents, and restricted cash at end of period	6	1
Cash paid for interest	2	1	1
Cash paid for taxes, net	$ 111	67	57
Non-cash distributions from subsidiaries		$ 1	$ 1

Schedule I - Condensed Financ_5

Schedule I - Condensed Financial Information of Registrant (Parent Company Only) (Transactions With Affiliates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Affiliate	$ 210	$ 214
Parent Company [Member]
Dividends received	185	128	$ 112
Affiliate	$ 210	$ 214

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Insider Trading Arrangements [Line Items]
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false