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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues:      
Trading gains $ 40 $ 163 $ 269
Commissions 647 612 617
Interest income 908 606 492
Other income (loss) 332 94 (122)
Total revenues 1,927 1,475 1,256
Interest expense 225 79 67
Total net revenues 1,702 1,396 1,189
Non-interest expenses:      
Execution and clearing 241 244 231
Employee compensation and benefits 249 242 227
Occupancy, depreciation and amortization 47 51 44
Communications 28 30 25
General and administrative 86 62 58
Customer bad debt 2 6 146
Total non-interest expenses 653 635 731
Income before income taxes 1,049 761 458
Income tax expense 256 62 43
Net income 793 699 415
Less net income attributable to noncontrolling interests 717 615 366
Net income available for common stockholders $ 76 $ 84 $ 49
Earnings per share:      
Basic $ 1.09 $ 1.28 $ 0.80
Diluted $ 1.07 $ 1.25 $ 0.78
Weighted average common shares outstanding:      
Weighted Average Number of Shares Outstanding, Basic 69,926,933 66,013,247 61,043,071
Weighted Average Number of Shares Outstanding, Diluted 70,904,921 67,299,413 62,509,796
Comprehensive income:      
Net income available for common stockholders $ 76 $ 84 $ 49
Other comprehensive income:      
Cumulative translation adjustment, before income taxes 11 (4) (10)
Other comprehensive income (loss), net of tax 11 (4) (10)
Comprehensive income available for common stockholders 87 80 39
Comprehensive income attributable to noncontrolling interests:      
Net income attributable to noncontrolling interests 717 615 366
Other comprehensive income - cumulative translation adjustment 54 (21) (53)
Comprehensive income attributable to noncontrolling interests $ 771 $ 594 $ 313