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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income $ 1,092 $ 497
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Deferred income taxes 29 10
Depreciation and amortization 25 20
Amortization of right-of-use assets 11 10
Employee stock plan compensation 34 29
Unrealized (gain) loss on other investments, net (225) 2
Bad debt expense 3 10
Shares distributed to customers under IBKR Promotions 4  
Change in operating assets and liabilities:    
Securities - segregated for regulatory purposes 12,186 (15,626)
Securities borrowed 1,326 (920)
Securities purchased under agreements to resell (3,374) 1,744
Financial instruments owned, at fair value (86) 1,020
Receivables from customers (10,624) 5,616
Other receivables (2,733) (633)
Other assets (17) (1)
Securities loaned 1,742 1,446
Securities sold under agreements to repurchase   (1,909)
Financial instruments sold but not yet purchased, at fair value 38 (223)
Payable to customers 5,570 12,548
Other payables 57 6
Net cash provided by operating activities 5,058 3,646
Cash flows from investing activities:    
Purchases of other investments (4) (2)
Distributions received and proceeds from sales of other investments 4 1
Purchase of property, equipment and intangible assets (38) (22)
Net cash used in investing activities (38) (23)
Cash flows from financing activities:    
Short-term borrowings, net 151 123
Dividends paid to stockholders (18) (15)
Distributions from IBG LLC to noncontrolling interests (131) (182)
Repurchases of common stock for employee tax withholding under stock incentive plans (27) (17)
Proceeds from sales of treasury stock 26 18
Issuance of senior notes 1,237  
Redemptions of senior notes (1,081)  
Payments made under the Tax Receivable Agreement   (17)
Net cash used in financing activities 157 (90)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash (55) (16)
Net increase in cash, cash equivalents, and restricted cash 5,122 3,517
Cash, cash equivalents, and restricted cash at beginning of period 20,195 12,282
Cash, cash equivalents, and restricted cash at end of period 25,317 15,799
Cash, cash equivalents, and restricted cash    
Cash and cash equivalents 3,218 3,115
Cash segregated for regulatory purposes 22,099 12,684
Cash, cash equivalents, and restricted cash 25,317 15,799
Supplemental disclosures of cash flow information:    
Cash paid for interest 115 187
Cash paid for taxes, net 43 21
Cash paid for amounts included in lease liabilities 12 10
Non-cash financing activities:    
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 24 21
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC $ (24) $ (21)