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Condensed Consolidated Statements of Cash Flows
$ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Cash flows from operating activities:    
Net income $ 964 $ 795
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Deferred income taxes (1) (1)
Depreciation and amortization 15 [1] 17 [1]
Amortization of right-of-use assets 7 7
Employee stock plan compensation 31 28
Unrealized (gains) losses on other investments, net (17) 8
Customer bad debt expense 1 5
Shares distributed to customers under IBKR Promotions 9 5
Change in operating assets and liabilities:    
Securities - segregated for regulatory purposes (1,548) 6,094
Securities borrowed (476) (527)
Securities purchased under agreements to resell (1,801) (1,170)
Financial instruments owned, at fair value (1,480) 376
Receivables from customers 574 (6,928)
Other receivables (296) (103)
Other assets (42) (35)
Securities loaned 646 2,869
Financial instruments sold but not yet purchased, at fair value (41) 43
Payable to customers 5,311 185
Other payables 728 15
Net cash provided by operating activities 2,584 1,683
Cash flows from investing activities:    
Purchases of other investments (10) (1)
Purchase of property, equipment and intangible assets (16) (12)
Net cash used in investing activities (26) (13)
Cash flows from financing activities:    
Short-term borrowings, net (2) (3)
Dividends paid to stockholders (27) (11)
Distributions to noncontrolling interests (196) (123)
Net cash used in financing activities (225) (137)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 107 (102)
Net increase in cash, cash equivalents and restricted cash 2,440 1,431
Cash, cash equivalents and restricted cash at beginning of period 40,233 32,593
Cash, cash equivalents and restricted cash at end of period 42,673 34,024
Cash, cash equivalents and restricted cash    
Cash and cash equivalents 3,500 4,063
Cash segregated for regulatory purposes 39,173 29,961
Cash, cash equivalents and restricted cash 42,673 34,024
Supplemental disclosures of cash flow information:    
Cash paid for interest 963 1,006
Cash paid for taxes, net 40 32
Cash paid for amounts included in lease liabilities 10 12
Non-cash financing activities:    
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 1 1
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC $ (1) $ (1)
[1] Included in “Occupancy, depreciation and amortization” in the condensed consolidated statements of comprehensive income.