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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net income $ 700 $ 366
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Deferred income taxes 3 2
Depreciation and amortization 16 15
Amortization of right-of-use assets 7 6
Employee stock plan compensation 26 21
Unrealized (gains) losses on other investments, net (3)  
Bad debt expense 3 1
Shares distributed to customers under IBKR Promotions 2 3
Change in operating assets and liabilities:    
Securities - segregated for regulatory purposes (5,206) (9,229)
Securities borrowed (557) (533)
Securities purchased under agreements to resell (670) (1,888)
Financial instruments owned, at fair value 71 96
Receivables from customers (735) 6,628
Other receivables 1,760 1,592
Other assets (25) (20)
Securities loaned 1,779 (390)
Securities sold under agreements to repurchase   300
Financial instruments sold but not yet purchased, at fair value 44 8
Payable to customers 1,702 5,463
Other payables 160 (316)
Net cash provided by (used in) operating activities (923) 2,125
Cash flows from investing activities:    
Distributions received and proceeds from sales of other investments 23 5
Purchase of property, equipment and intangible assets (17) (19)
Net cash provided by (used in) investing activities 6 (14)
Cash flows from financing activities:    
Short-term borrowings, net (8) (16)
Dividends paid to stockholders (10) (9)
Distributions from IBG LLC to noncontrolling interests (119) (80)
Net cash used in financing activities (137) (105)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 19 (41)
Net increase (decrease) in cash, cash equivalents and restricted cash (1,035) 1,965
Cash, cash equivalents and restricted cash at beginning of period 28,603 25,283
Cash, cash equivalents and restricted cash at end of period 27,568 27,248
Cash, cash equivalents and restricted cash    
Cash and cash equivalents 3,214 2,667
Cash segregated for regulatory purposes 24,354 24,581
Cash, cash equivalents and restricted cash 27,568 27,248
Supplemental disclosures of cash flow information:    
Cash paid for interest 666 50
Cash paid for taxes, net 50 16
Cash paid for amounts included in lease liabilities 9 8
Non-cash financing activities:    
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 2 1
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC $ (2) $ (1)