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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Revenue from Contract with Customer, Excluding Assessed Tax $ 204 $ 681
Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax 203 676
Market Making [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax 1 4
Corporate [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax   1
United States [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 145 488
United States [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 144 483
United States [Member] | Market Making [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 1 4
United States [Member] | Corporate [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1]   1
International [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 59 193
International [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 59 193
Commissions [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax 167 572
Commissions [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax 167 572
Market Data Fees [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 12 34
Market Data Fees [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 12 34
Risk Exposure Fees [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 5 20
Risk Exposure Fees [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 5 20
Payments For Order Flow [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 6 16
Payments For Order Flow [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 6 16
Minimum Activity Fees [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 6 16
Minimum Activity Fees [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 6 16
Others [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 8 23
Others [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 7 18
Others [Member] | Market Making [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] $ 1 4
Others [Member] | Corporate [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2]   $ 1
[1] Based on the location of the subsidiaries in which the revenues are recorded.Included in other income on the condensed consolidated statements of comprehensive income.
[2] Included in other income on the condensed consolidated statements of comprehensive income.