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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net income $ 726 $ 1,092
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Deferred income taxes 6 29
Depreciation and amortization 29 25
Amortization of right-of-use assets 13 11
Employee stock plan compensation 42 34
Unrealized gain on other investments, net 7 (225)
Bad debt expense 2 3
Shares distributed to customers under IBKR Promotions 5 4
Change in operating assets and liabilities:    
Securities - segregated for regulatory purposes (15,588) 12,186
Securities borrowed 57 1,326
Securities purchased under agreements to resell (1,908) (3,374)
Financial instruments owned, at fair value 114 (86)
Receivables from customers 12,381 (10,624)
Other receivables 1,809 (2,733)
Other assets 35 (17)
Securities loaned (1,073) 1,742
Financial instruments sold but not yet purchased, at fair value 36 38
Payable to customers 5,131 5,570
Other payables (240) 57
Net cash provided by operating activities 1,584 5,058
Cash flows from investing activities:    
Purchases of other investments (3) (4)
Distributions received and proceeds from sales of other investments 9 4
Purchase of property, equipment and intangible assets (32) (38)
Net cash used in investing activities (26) (38)
Cash flows from financing activities:    
Short-term borrowings, net (10) 151
Dividends paid to stockholders (20) (18)
Distributions from IBG LLC to noncontrolling interests (231) (131)
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   1,237
Redemptions of senior notes   (1,081)
Payments made under the Tax Receivable Agreement (20)  
Net cash used in financing activities (278) 157
Effect of exchange rate changes on cash, cash equivalents and restricted cash (146) (55)
Net increase in cash, cash equivalents and restricted cash 1,134 5,122
Cash, cash equivalents and restricted cash at beginning of period 25,283 20,195
Cash, cash equivalents and restricted cash at end of period 26,417 25,317
Cash, cash equivalents and restricted cash    
Cash and cash equivalents 2,881 3,218
Cash segregated for regulatory purposes 23,536 22,099
Cash, cash equivalents and restricted cash 26,417 25,317
Supplemental disclosures of cash flow information:    
Cash paid for interest 133 115
Cash paid for taxes, net 65 43
Cash paid for amounts included in lease liabilities 16 12
Non-cash financing activities:    
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)