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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:      
Net income $ 3,407 $ 2,812 $ 1,842
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Deferred income taxes (2) 30 20
Depreciation and amortization 67 65 58
Amortization of right-of-use assets 29 29 26
Employee stock plan compensation 112 100 92
Unrealized (gains) losses on other investments, net (12) (14) 8
Gain on remeasurement of Tax Receivable Agreement liability 10 (7) (6)
Customer bad debt expense 15 7 3
Impairment loss     1
Shares distributed to customers under IBKR Promotions 23 12 9
Change in operating assets and liabilities:      
Securities - segregated for regulatory purposes 7,540 (3,605) (16,660)
Securities borrowed 466 (1,086) (837)
Securities purchased under agreements to resell (1,071) 525 (1,649)
Financial instruments owned, at fair value (434) (1,033) 189
Receivables from customers (19,975) (5,719) 16,172
Other receivables (624) 1,792 88
Other assets (203) (103) 35
Securities loaned 4,901 2,407 (2,829)
Financial instruments sold but not yet purchased, at fair value 100 47 (36)
Payable to customers 14,331 7,817 7,561
Other payables 44 468 (119)
Net cash provided by operating activities 8,724 4,544 3,968
Cash flows from investing activities:      
Purchases of other investments (40) (26) (5)
Distributions received and proceeds from sales of other investments 45 23 7
Purchase of property, equipment and intangible assets (49) (49) (69)
Net cash used in investing activities (44) (52) (67)
Cash flows from financing activities:      
Short-term borrowings, net (3) (1) (9)
Dividends paid to stockholders (92) (42) (40)
Distributions to noncontrolling interests (715) (556) (404)
Repurchases of common stock for employee tax withholdings (54) (34) (20)
Proceeds from sales of treasury stock 56 34 23
Payments made under the Tax Receivable Agreement (25) (25) (20)
Net cash used in financing activities (833) (624) (470)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (207) 122 (111)
Net increase in cash, cash equivalents and restricted cash 7,640 3,990 3,320
Cash, cash equivalents and restricted cash at beginning of period 32,593 28,603 25,283
Cash, cash equivalents and restricted cash at end of period 40,233 32,593 28,603
Cash, cash equivalents and restricted cash      
Cash and cash equivalents 3,633 3,753 3,436
Cash segregated for regulatory purposes 36,600 28,840 25,167
Cash, cash equivalents and restricted cash 40,233 32,593 28,603
Supplemental disclosures of cash flow information:      
Cash paid for interest 4,190 3,317 833
Cash paid for taxes, net 279 228 148
Cash paid for amounts included in lease liabilities 39 35 32
Non-cash financing activities:      
Issuance of common stock in exchange of member interests in IBG LLC 39 229 192
Redemption of member interests from IBG Holdings LLC (39) (229) (192)
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 41 33 27
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC $ (41) $ (33) (27)
Non-cash distribution to noncontrolling interests     $ (1)