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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 793 $ 699 $ 415
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Deferred income taxes 147 27 15
Depreciation and amortization 25 25 22
Employee stock plan compensation 53 51 50
Unrealized (gain) loss on other investments, net (4) 1 7
Gain on remeasurement of Tax Receivable Agreement liability (93)    
Bad debt expense 2 6 146
Impairment loss 21    
Change in operating assets and liabilities:      
Cash and securities - segregated for regulatory purposes 3,785 (2,708) (5,905)
Securities borrowed 672 295 (264)
Securities purchased under agreements to resell (1,924) 84 191
Financial instruments owned, at fair value 886 (647) 568
Receivables from customers (10,414) (2,365) (144)
Other receivables 158 (342) 413
Other assets (3) 3 13
Securities loaned 151 1,399 (305)
Securities sold under agreement to repurchase 1,316    
Financial instruments sold but not yet purchased, at fair value (1,378) (454) 38
Payable to customers 5,817 4,647 5,288
Other payables 132 (177) 177
Net cash provided by operating activities 142 544 725
Cash flows from investing activities:      
Purchases of other investments   (17) (16)
Distributions received and proceeds from sales of other investments 2 38 11
Purchase of property and equipment (28) (27) (30)
Net cash used in investing activities (26) (6) (35)
Cash flows from financing activities:      
Short-term borrowings, net (59) 74 (34)
Dividends paid to stockholders (28) (26) (25)
Distributions to noncontrolling interests (272) (219) (227)
Repurchases of common stock for employee tax withholding under stock incentive plans (21) (26) (25)
Proceeds from sales of treasury stock 21 25 29
Payments made under the Tax Receivable Agreement (15) (17) (13)
Net cash used in financing activities (374) (189) (295)
Effect of exchange rate changes on cash and cash equivalents 65 (25) (63)
Net increase (decrease) in cash and cash equivalents (193) 324 332
Cash and cash equivalents at beginning of period 1,925 1,601 1,269
Cash and cash equivalents at end of period 1,732 1,925 1,601
Supplemental disclosures of cash flow information:      
Cash paid for interest 209 77 68
Cash paid for taxes, net 47 29 31
Non-cash financing activities:      
Issuance of Common Stock in exchange of member interests in IBG LLC 49 56 132
Redemption of member interests from IBG Holdings LLC (49) (56) (132)
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 28 25 26
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC $ (28) (25) $ (26)
Non-cash distribution to noncontrolling interests   $ (5)