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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Revenue from Contract with Customer, Excluding Assessed Tax $ 221 $ 477
Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax 219 473
Market Making [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax 1 3
Corporate [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax 1 1
United States [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 159 343
United States [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 157 339
United States [Member] | Market Making [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 1 3
United States [Member] | Corporate [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 1 1
International [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 62 134
International [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 62 134
Commissions [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax 185 405
Commissions [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax 185 405
Market Data Fees [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 11 22
Market Data Fees [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 11 22
Risk Exposure Fees [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 7 15
Risk Exposure Fees [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 7 15
Payments For Order Flow [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 5 10
Payments For Order Flow [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 5 10
Minimum Activity Fees [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 5 10
Minimum Activity Fees [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 5 10
Others [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 8 15
Others [Member] | Electronic Brokerage [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 6 11
Others [Member] | Market Making [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 1 3
Others [Member] | Corporate [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] $ 1 $ 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.