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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net income $ 366 $ 586
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Deferred income taxes 2 15
Depreciation and amortization 15 13
Amortization of right-of-use assets 6 5
Employee stock plan compensation 21 17
Unrealized gain on other investments, net   (108)
Bad debt expense 1 2
Shares distributed to customers under IBKR Promotions 3 2
Change in operating assets and liabilities:    
Securities - segregated for regulatory purposes (9,229) 2,752
Securities borrowed (533) (752)
Securities purchased under agreements to resell (1,888) (900)
Financial instruments owned, at fair value 96 (4)
Receivables from customers 6,628 (3,314)
Other receivables 1,592 (2,126)
Other assets (20) (6)
Securities loaned (390) 2,029
Securities sold under agreements to repurchase 300  
Financial instruments sold but not yet purchased, at fair value 8 38
Payable to customers 5,463 5,322
Other payables (316) 163
Net cash provided by operating activities 2,125 3,734
Cash flows from investing activities:    
Purchases of other investments   (1)
Distributions received and proceeds from sales of other investments 5 1
Purchase of property, equipment and intangible assets (19) (21)
Net cash used in investing activities (14) (21)
Cash flows from financing activities:    
Short-term borrowings, net (16) (10)
Dividends paid to stockholders (9) (9)
Distributions from IBG LLC to noncontrolling interests (80) (86)
Issuance of senior notes   602
Redemptions of senior notes   (498)
Net cash used in financing activities (105) (1)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (41) (76)
Net increase in cash, cash equivalents and restricted cash 1,965 3,636
Cash, cash equivalents and restricted cash at beginning of period 25,283 20,195
Cash, cash equivalents and restricted cash at end of period 27,248 23,831
Cash, cash equivalents and restricted cash    
Cash and cash equivalents 2,667 2,627
Cash segregated for regulatory purposes 24,581 21,204
Cash, cash equivalents and restricted cash 27,248 23,831
Supplemental disclosures of cash flow information:    
Cash paid for interest 50 79
Cash paid for taxes, net 16 24
Cash paid for amounts included in lease liabilities 8 6
Non-cash financing activities:    
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 1 1
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC $ (1) $ (1)