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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income $ 3,156 $ 2,438
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Deferred income taxes 28 7
Depreciation and amortization [1] 45 51
Amortization of right-of-use assets 24 22
Employee stock plan compensation 90 80
Unrealized (gains) losses on other investments, net (76) (18)
Customer bad debt expense   14
Shares distributed to customers under IBKR Promotions 25 17
Change in operating assets and liabilities:    
Securities - segregated for regulatory purposes (10,845) 4,283
Securities borrowed (6,199) (1,678)
Securities purchased under agreements to resell (1,949) (2,672)
Financial instruments owned, at fair value (1,197) (1,461)
Receivables from customers (13,157) (11,548)
Other receivables (2,619) (615)
Other assets (295) (135)
Securities loaned 10,783 5,471
Securities sold under agreement to repurchase 894  
Financial instruments sold but not yet purchased, at fair value 206 188
Payable to customers 34,099 11,567
Other payables 1,189 875
Net cash provided by operating activities 14,202 6,886
Cash flows from investing activities:    
Purchases of other investments (67) (28)
Purchase of property, equipment and intangible assets (45) (34)
Net cash used in investing activities (112) (62)
Cash flows from financing activities:    
Short-term borrowings, net (4) 16
Dividends paid to stockholders (98) (65)
Distributions to noncontrolling interests (680) (576)
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 (786) (647)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 375 41
Net increase in cash, cash equivalents and restricted cash 13,679 6,218
Cash, cash equivalents and restricted cash at beginning of period 40,233 32,593
Cash, cash equivalents and restricted cash at end of period 53,912 38,811
Cash, cash equivalents and restricted cash    
Cash and cash equivalents 5,128 3,595
Cash segregated for regulatory purposes 48,784 35,216
Cash, cash equivalents and restricted cash 53,912 38,811
Supplemental disclosures of cash flow information:    
Cash paid for interest 3,108 3,119
Cash paid for taxes, net 251 213
Cash paid for amounts included in lease liabilities 31 31
Non-cash financing activities:    
Issuance of common stock in exchange of member interests in IBG LLC 254 39
Redemption of member interests from IBG Holdings LLC (254) (39)
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 46 40
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC $ (46) $ (40)
[1] Included in “Occupancy, depreciation and amortization” in the condensed consolidated statements of comprehensive income.