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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
Revenue from Contract with Customer, Excluding Assessed Tax $ 256 [1]
Electronic Brokerage [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 254 [1]
Market Making [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 2 [1]
United States [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 184 [1]
United States [Member] | Electronic Brokerage [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 182 [1]
United States [Member] | Market Making [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 2 [1]
International [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 72 [1]
International [Member] | Electronic Brokerage [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 72 [1]
Commissions [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 220
Commissions [Member] | Electronic Brokerage [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 220
Market Data Fees [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 11 [2]
Market Data Fees [Member] | Electronic Brokerage [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 11 [2]
Risk Exposure Fees [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 8 [2]
Risk Exposure Fees [Member] | Electronic Brokerage [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 8 [2]
Payments For Order Flow [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 5 [2]
Payments For Order Flow [Member] | Electronic Brokerage [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 5 [2]
Minimum Activity Fees [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 5 [2]
Minimum Activity Fees [Member] | Electronic Brokerage [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 5 [2]
Others [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 7 [2]
Others [Member] | Electronic Brokerage [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax 5 [2]
Others [Member] | Market Making [Member]  
Revenue from Contract with Customer, Excluding Assessed Tax $ 2 [2]
[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.