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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 319 $ 195
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Deferred income taxes 4 5
Depreciation and amortization 7 6
Employee stock plan compensation 14 13
Unrealized (gain) loss on other investments, net (2)  
Bad debt expense 3 1
Impairment loss 1  
Change in operating assets and liabilities:    
Securities - segregated for regulatory purposes 932 295
Securities borrowed (11) (294)
Securities purchased under agreements to resell 1,358 (1)
Financial instruments owned, at fair value 742 1,014
Receivables from customers 354 (1,865)
Other receivables (162) (17)
Other assets (12) (2)
Securities loaned (273) (326)
Securities sold under agreement to repurchase (1,316)  
Financial instruments sold but not yet purchased, at fair value (525) (779)
Payable to customers (125) 2,570
Other payables (107) (36)
Net cash provided by operating activities 1,201 779
Cash flows from investing activities:    
Purchase of property and equipment (8) (6)
Net cash used in investing activities (8) (6)
Cash flows from financing activities:    
Short-term borrowings, net 4 (36)
Dividends paid to stockholders (7) (7)
Distributions to noncontrolling interests (61) (34)
Net cash used in financing activities (64) (77)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash 8 23
Net increase in cash, cash equivalents, and restricted cash 1,137 719
Cash, cash equivalents, and restricted cash at beginning of period 8,279 7,549
Cash, cash equivalents, and restricted cash at end of period 9,416 8,268
Cash, cash equivalents, and restricted cash    
Cash, cash equivalents, and restricted cash at end of period 8,279 7,549
Supplemental disclosures of cash flow information:    
Cash paid for interest 89 30
Cash paid for taxes, net $ 13 $ 7