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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net income $ 2,073 $ 1,209
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Deferred income taxes 9 8
Depreciation and amortization 49 43
Amortization of right-of-use assets 20 19
Employee stock plan compensation 75 64
Unrealized (gains) losses on other investments, net (21) 13
Bad debt expense 2 3
Impairment loss   1
Shares distributed to customers under IBKR Promotions 7 7
Change in operating assets and liabilities:    
Securities - segregated for regulatory purposes 446 (16,180)
Securities borrowed (729) 4
Securities purchased under agreements to resell 549 (480)
Financial instruments owned, at fair value (870) (423)
Receivables from customers (4,844) 14,508
Other receivables 1,644 353
Other assets (59) 61
Securities loaned 1,542 (2,279)
Financial instruments sold but not yet purchased, at fair value 52 229
Payable to customers 1,678 6,960
Other payables 552 (122)
Net cash provided by operating activities 2,175 3,998
Cash flows from investing activities:    
Purchases of other investments (10) (5)
Distributions received and proceeds from sales of other investments 23 7
Purchase of property, equipment and intangible assets (40) (50)
Net cash used in investing activities (27) (48)
Cash flows from financing activities:    
Short-term borrowings, net (7) 8
Dividends paid to stockholders (31) (30)
Distributions to noncontrolling interests (453) (309)
Repurchases of common stock for employee tax withholdings (34) (20)
Proceeds from sales of treasury stock 34 23
Payments made under the Tax Receivable Agreement (25) (20)
Net cash used in financing activities (516) (348)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (26) (269)
Net increase in cash, cash equivalents and restricted cash 1,606 3,333
Cash, cash equivalents and restricted cash at beginning of period 28,603 25,283
Cash, cash equivalents and restricted cash at end of period 30,209 28,616
Cash, cash equivalents and restricted cash    
Cash and cash equivalents 3,824 3,184
Cash segregated for regulatory purposes 26,385 25,432
Cash, cash equivalents and restricted cash 30,209 28,616
Supplemental disclosures of cash flow information:    
Cash paid for interest 2,375 381
Cash paid for taxes, net 162 89
Cash paid for amounts included in lease liabilities 26 23
Non-cash financing activities:    
Issuance of common stock in exchange of member interests in IBG LLC 229 192
Redemption of member interests from IBG Holdings LLC (229) (192)
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 32 26
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC $ (32) $ (26)