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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net income $ 1,209 $ 1,298
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Deferred income taxes 8 18
Depreciation and amortization 43 37
Amortization of right-of-use assets 19 17
Employee stock plan compensation 64 51
Unrealized (gain) loss on other investments, net 13 (45)
(Gain) loss on remeasurement of Tax Receivable Agreement liability   (1)
Bad debt expense 3 3
Impairment loss 1  
Shares distributed to customers under IBKR Promotions 7 6
Change in operating assets and liabilities:    
Securities - segregated for regulatory purposes (16,180) 13,421
Securities borrowed 4 1,145
Securities purchased under agreements to resell (480) (5,316)
Financial instruments owned, at fair value (423) (20)
Receivables from customers 14,508 (11,173)
Other receivables 353 (2,793)
Other assets 61 (19)
Securities loaned (2,279) 697
Financial instruments sold but not yet purchased, at fair value 229 80
Payable to customers 6,960 8,205
Other payables (122) 660
Net cash provided by operating activities 3,998 6,271
Cash flows from investing activities:    
Purchases of other investments (5) (13)
Distributions received and proceeds from sales of other investments 7 5
Purchase of property, equipment and intangible assets (50) (51)
Net cash used in investing activities (48) (59)
Cash flows from financing activities:    
Short-term borrowings, net 8 6
Dividends paid to stockholders (30) (28)
Distributions from IBG LLC to noncontrolling interests (309) (230)
Repurchases of common stock for employee tax withholding under stock incentive plans (20) (27)
Proceeds from sales of treasury stock 23 26
Issuance of senior notes   1,428
Redemptions of senior notes   (1,524)
Payments made under the Tax Receivable Agreement (20)  
Net cash used in financing activities (348) (349)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (269) (95)
Net increase in cash, cash equivalents and restricted cash 3,333 5,768
Cash, cash equivalents and restricted cash at beginning of period 25,283 20,195
Cash, cash equivalents and restricted cash at end of period 28,616 25,963
Cash, cash equivalents and restricted cash    
Cash and cash equivalents 3,184 2,838
Cash segregated for regulatory purposes 25,432 23,125
Cash, cash equivalents and restricted cash 28,616 25,963
Supplemental disclosures of cash flow information:    
Cash paid for interest 381 165
Cash paid for taxes, net 89 87
Cash paid for amounts included in lease liabilities 23 18
Non-cash financing activities:    
Issuance of common stock in exchange of member interests in IBG LLC 192 376
Redemption of member interests from IBG Holdings LLC (192) (376)
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 26 24
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC $ (26) $ (24)