Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities:
Net income		$ 1,970	$ 1,604
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income taxes		8	6
Depreciation and amortization	[1]	30	34
Amortization of right-of-use assets		15	14
Employee stock plan compensation		59	54
Unrealized (gains) losses on other investments, net		(33)	(5)
Customer bad debt expense		2	7
Shares distributed to customers under IBKR Promotions		17	11
Change in operating assets and liabilities:
Securities - segregated for regulatory purposes		(9,126)	7,068
Securities borrowed		(4,776)	(383)
Securities purchased under agreements to resell		(2,954)	(707)
Financial instruments owned, at fair value		(1,928)	(277)
Receivables from customers		(915)	(10,787)
Other receivables		(1,886)	(295)
Other assets		(191)	(104)
Securities loaned		4,981	4,335
Financial instruments sold but not yet purchased, at fair value		201	280
Payable to customers		23,074	2,361
Other payables		1,175	88
Net cash provided by operating activities		9,723	3,304
Cash flows from investing activities:
Purchases of other investments		(38)	(4)
Purchase of property, equipment and intangible assets		(30)	(23)
Net cash used in investing activities		(68)	(27)
Cash flows from financing activities:
Short-term borrowings, net		(6)	(6)
Dividends paid to stockholders		(62)	(38)
Distributions to noncontrolling interests		(484)	(404)
Repurchases of common stock for employee tax withholdings		(84)	(54)
Proceeds from sales of treasury stock		95	57
Payments made under the Tax Receivable Agreement		(15)	(25)
Net cash used in financing activities		(556)	(470)
Effect of exchange rate changes on cash, cash equivalents and restricted cash		413	(112)
Net increase in cash, cash equivalents and restricted cash		9,512	2,695
Cash, cash equivalents and restricted cash at beginning of period		40,233	32,593
Cash, cash equivalents and restricted cash at end of period		49,745	35,288
Cash, cash equivalents and restricted cash
Cash and cash equivalents		4,688	3,918
Cash segregated for regulatory purposes		45,057	31,370
Cash, cash equivalents and restricted cash		49,745	35,288
Supplemental disclosures of cash flow information:
Cash paid for interest		2,007	2,040
Cash paid for taxes, net		193	152
Cash paid for amounts included in lease liabilities		21	20
Non-cash financing activities:
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC		46	38
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC		$ (46)	$ (38)

[1] Included in “Occupancy, depreciation and amortization” in the condensed consolidated statements of comprehensive income.