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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 586 $ 290
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Deferred income taxes 15 5
Depreciation and amortization 13 10
Amortization of right-of-use assets 5 5
Employee stock plan compensation 17 16
Unrealized (gain) loss on other investments, net (108) 19
Bad debt expense 2 7
Shares distributed to customers under IBKR Promotions 2  
Change in operating assets and liabilities:    
Securities - segregated for regulatory purposes 2,752 (12,363)
Securities borrowed (752) (54)
Securities purchased under agreements to resell (900) 2,201
Financial instruments owned, at fair value (4) 704
Receivables from customers (3,314) 11,205
Other receivables (2,126) (805)
Other assets (6) (4)
Securities loaned 2,029 (366)
Securities sold under agreements to repurchase   (1,909)
Financial instruments sold but not yet purchased, at fair value 38 (296)
Payable to customers 5,322 6,491
Other payables 163 47
Net cash provided by operating activities 3,734 5,203
Cash flows from investing activities:    
Purchases of other investments (1)  
Distributions received and proceeds from sales of other investments 1 1
Purchase of property, equipment and intangible assets (21) (12)
Net cash used in investing activities (21) (11)
Cash flows from financing activities:    
Short-term borrowings, net (10) (2)
Dividends paid to stockholders (9) (8)
Distributions from IBG LLC to noncontrolling interests (86) (53)
Issuance of senior notes 602  
Redemptions of senior notes (498)  
Net cash used in financing activities (1) (63)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash (76) (38)
Net increase in cash, cash equivalents, and restricted cash 3,636 5,091
Cash, cash equivalents, and restricted cash at beginning of period 20,195 12,282
Cash, cash equivalents, and restricted cash at end of period 23,831 17,373
Cash, cash equivalents, and restricted cash    
Cash, cash equivalents, and restricted cash 23,831 17,373
Supplemental disclosures of cash flow information:    
Cash paid for interest 79 129
Cash paid for taxes, net 24 15
Cash paid for amounts included in lease liabilities 6 $ 5
Non-cash financing activities:    
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 1  
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC $ (1)