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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net income $ 795 $ 700
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Deferred income taxes (1) 3
Depreciation and amortization 17 16
Amortization of right-of-use assets 7 7
Employee stock plan compensation 28 26
Unrealized (gains) losses on other investments, net 8 (3)
Customer bad debt expense 5 3
Shares distributed to customers under IBKR Promotions 5 2
Change in operating assets and liabilities:    
Securities - segregated for regulatory purposes 6,094 (5,206)
Securities borrowed (527) (557)
Securities purchased under agreements to resell (1,170) (670)
Financial instruments owned, at fair value 376 71
Receivables from customers (6,928) (735)
Other receivables (103) 1,760
Other assets (35) (25)
Securities loaned 2,869 1,779
Financial instruments sold but not yet purchased, at fair value 43 44
Payable to customers 185 1,702
Other payables 15 160
Net cash provided by operating activities 1,683 (923)
Cash flows from investing activities:    
Purchases of other investments (1)  
Distributions received and proceeds from sales of other investments   23
Purchase of property, equipment and intangible assets (12) (17)
Net cash used in investing activities (13) 6
Cash flows from financing activities:    
Short-term borrowings, net (3) (8)
Dividends paid to stockholders (11) (10)
Distributions to noncontrolling interests (123) (119)
Net cash used in financing activities (137) (137)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (102) 19
Net increase in cash, cash equivalents and restricted cash 1,431 (1,035)
Cash, cash equivalents and restricted cash at beginning of period 32,593 28,603
Cash, cash equivalents and restricted cash at end of period 34,024 27,568
Cash, cash equivalents and restricted cash    
Cash and cash equivalents 4,063 3,214
Cash segregated for regulatory purposes 29,961 24,354
Cash, cash equivalents and restricted cash 34,024 27,568
Supplemental disclosures of cash flow information:    
Cash paid for interest 1,006 666
Cash paid for taxes, net 32 50
Cash paid for amounts included in lease liabilities 12 9
Non-cash financing activities:    
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 1 2
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC $ (1) $ (2)