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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Revenue from Contract with Customer, Excluding Assessed Tax | $ 847 | $ 925
Electronic Brokerage [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 843 | 918
Market Making [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2 | 5
Corporate [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2 | 2
United States [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 603 | 665
United States [Member] | Electronic Brokerage [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 599 | 658
United States [Member] | Market Making [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2 | 5
United States [Member] | Corporate [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2 | 2
International [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 244 | 260
International [Member] | Electronic Brokerage [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 244 | 260
Commissions [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 706 | 777
Commissions [Member] | Electronic Brokerage [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 706 | 777
Market Data Fees [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 45 | 46
Market Data Fees [Member] | Electronic Brokerage [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 45 | 46
Risk Exposure Fees [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 16 | 26
Risk Exposure Fees [Member] | Electronic Brokerage [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 16 | 26
Payments For Order Flow [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 21 | 21
Payments For Order Flow [Member] | Electronic Brokerage [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 21 | 21
Minimum Activity Fees [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 27 | 23
Minimum Activity Fees [Member] | Electronic Brokerage [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 27 | 23
Others [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 32 | 32
Others [Member] | Electronic Brokerage [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 28 | 25
Others [Member] | Market Making [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2 | 5
Others [Member] | Corporate [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 2 | $ 2

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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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