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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 1,125 $ 793 $ 699
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Deferred income taxes 21 147 27
Depreciation and amortization 26 25 25
Employee stock plan compensation 58 53 51
Unrealized (gain) loss on other investments, net 2 (4) 1
Gain on remeasurement of Tax Receivable Agreement liability (3) (93)  
Bad debt expense 4 2 6
Impairment loss 1 21  
Change in operating assets and liabilities:      
Securities - segregated for regulatory purposes (1,910) 4,708 (2,617)
Securities borrowed (374) 672 295
Securities purchased under agreements to resell 793 (1,924) 84
Financial instruments owned, at fair value 1,034 886 (647)
Receivables from customers 2,800 (10,414) (2,365)
Other receivables 92 158 (342)
Other assets 11 (3) 3
Securities loaned (407) 151 1,399
Securities sold under agreement to repurchase (1,316) 1,316  
Financial instruments sold but not yet purchased, at fair value (86) (1,378) (454)
Payable to customers 445 5,817 4,647
Other payables 40 132 (177)
Net cash provided by operating activities 2,356 1,065 635
Cash flows from investing activities:      
Purchases of other investments (22)   (17)
Distributions received and proceeds from sales of other investments 1 2 38
Purchase of property, equipment and intangible assets (36) (28) (27)
Net cash used in investing activities (57) (26) (6)
Cash flows from financing activities:      
Short-term borrowings, net 2 (59) 74
Dividends paid to stockholders (29) (28) (26)
Distributions from IBG LLC to noncontrolling interests (339) (272) (219)
Repurchases of common stock for employee tax withholding under stock incentive plans (45) (21) (26)
Proceeds from sales of treasury stock 40 21 25
Payments made under the Tax Receivable Agreement (28) (15) (17)
Net cash used in financing activities (399) (374) (189)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash (79) 65 (25)
Net increase in cash, cash equivalents, and restricted cash 1,821 730 415
Cash, cash equivalents, and restricted cash at beginning of period 8,279 7,549 7,134
Cash, cash equivalents, and restricted cash at end of period 10,100 8,279 7,549
Cash, cash equivalents, and restricted cash      
Cash, cash equivalents, and restricted cash 8,279 7,549 7,134
Supplemental disclosures of cash flow information:      
Cash paid for interest 444 209 77
Cash paid for taxes, net 50 47 29
Non-cash financing activities:      
Issuance of common stock in exchange of member interests in IBG LLC 94 49 56
Redemption of member interests from IBG Holdings LLC (94) (49) (56)
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 28 28 25
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC (28) $ (28) (25)
Non-cash distribution to noncontrolling interests $ (11)   $ (5)