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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | $ 307 | $ 208
United States [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | 197 | 148
International [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | 110 | 60
Commissions [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 269 | 173
Market Data Fees [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | 13 | 12
Risk Exposure Fees [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | 4 | 4
Payments For Order Flow [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | 7 | 5
Minimum Activity Fees [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | 6 | 7
Others [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | $ 8 | $ 7
[1] | Based on the location of the subsidiaries in which the revenues are recorded.
[2] | Included in other fees and services in the condensed consolidated statements of comprehensive income.

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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