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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income $ 1,301 $ 726
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Deferred income taxes 7 6
Depreciation and amortization 32 29
Amortization of right-of-use assets 14 13
Employee stock plan compensation 49 42
Unrealized (gains) losses on other investments, net 7 7
Bad debt expense 2 2
Shares distributed to customers under IBKR Promotions 5 5
Change in operating assets and liabilities:    
Securities - segregated for regulatory purposes (1,676) (15,588)
Securities borrowed (1,250) 57
Securities purchased under agreements to resell (402) (1,908)
Financial instruments owned, at fair value (42) 114
Receivables from customers (3,208) 12,381
Other receivables 2,019 1,809
Other assets (56) 35
Securities loaned 1,321 (1,073)
Financial instruments sold but not yet purchased, at fair value 11 36
Payable to customers 2,804 5,131
Other payables 258 (240)
Net cash provided by operating activities 1,196 1,584
Cash flows from investing activities:    
Purchases of other investments   (3)
Distributions received and proceeds from sales of other investments 23 9
Purchase of property, equipment and intangible assets (32) (32)
Net cash used in investing activities (9) (26)
Cash flows from financing activities:    
Short-term borrowings, net (1) (10)
Dividends paid to stockholders (21) (20)
Distributions to noncontrolling interests (342) (231)
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 (389) (278)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 50 (146)
Net increase in cash, cash equivalents and restricted cash 848 1,134
Cash, cash equivalents and restricted cash at beginning of period 28,603 25,283
Cash, cash equivalents and restricted cash at end of period 29,451 26,417
Cash, cash equivalents and restricted cash    
Cash and cash equivalents 3,681 2,881
Cash segregated for regulatory purposes 25,770 23,536
Cash, cash equivalents and restricted cash 29,451 26,417
Supplemental disclosures of cash flow information:    
Cash paid for interest 1,484 133
Cash paid for taxes, net 125 65
Cash paid for amounts included in lease liabilities 17 16
Non-cash financing activities:    
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)