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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income $ 1,636 $ 1,179 $ 1,089
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Deferred income taxes 23 9 24
Depreciation and amortization 50 42 31
Amortization of right-of-use assets 24 20 21
Employee stock plan compensation 80 65 60
Unrealized gain on other investments, net 9 (50) (8)
(Gain) loss on remeasurement of Tax Receivable Agreement liability (1) 3  
Bad debt expense 3 13 44
Impairment loss   14 1
Shares distributed to customers under IBKR Promotions 9    
Change in operating assets and liabilities:      
Securities - segregated for regulatory purposes 12,700 (9,997) (2,229)
Securities borrowed 1,044 (1,040) (585)
Securities purchased under agreements to resell (3,588) 2,319 (1,869)
Financial instruments owned, at fair value (32) 1,286 210
Receivables from customers (15,605) (8,041) (4,332)
Other receivables (2,540) (515) 4
Other assets (198) (11) (169)
Securities loaned 1,931 5,428 373
Securities sold under agreements to repurchase   (1,909) 1,909
Financial instruments sold but not yet purchased, at fair value 29 (304) (224)
Payable to customers 9,754 19,634 8,255
Other payables 568 (77) 61
Net cash provided by operating activities 5,896 8,068 2,666
Cash flows from investing activities:      
Purchases of other investments (116) (5) (19)
Distributions received and proceeds from sales of other investments 5 5 4
Purchase of property, equipment and intangible assets (77) (50) (74)
Net cash used in investing activities (188) (50) (89)
Cash flows from financing activities:      
Short-term borrowings, net 4 6 (1)
Dividends paid to stockholders (38) (32) (31)
Distributions from IBG LLC to noncontrolling interests (374) (283) (357)
Repurchases of common stock for employee tax withholding under stock incentive plans (27) (17) (27)
Proceeds from sales of treasury stock 26 18 26
Issuance of senior notes 1,428 116  
Redemptions of senior notes (1,524) (20)  
Payments made under the Tax Receivable Agreement (18) (17) (29)
Net cash used in financing activities (523) (229) (419)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (97) 124 24
Net increase in cash, cash equivalents and restricted cash 5,088 7,913 2,182
Cash, cash equivalents and restricted cash at beginning of period 20,195 12,282 10,100
Cash, cash equivalents and restricted cash at end of period 25,283 20,195 12,282
Cash, cash equivalents and restricted cash      
Cash and cash equivalents 2,395 4,292 2,882
Cash segregated for regulatory purposes 22,888 15,903 9,400
Cash, cash equivalents and restricted cash 25,283 20,195 12,282
Supplemental disclosures of cash flow information:      
Cash paid for interest 222 284 654
Cash paid for taxes, net 114 64 51
Cash paid for amounts included in lease liabilities 24 21 20
Non-cash financing activities:      
Issuance of common stock in exchange of member interests in IBG LLC 376 609 1
Redemption of member interests from IBG Holdings LLC (376) (609) (1)
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 25 21 24
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC (25) (21) $ (24)
Non-cash distribution to noncontrolling interests $ (3) $ (5)