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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from Contract with Customer, Excluding Assessed Tax	$ 208	$ 256
Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	207	254
Market Making [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1	2
United States [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	148	184
United States [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	147	182
United States [Member] | Market Making [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1	2
International [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	60	72
International [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	60	72
Commissions [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	173	220
Commissions [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	173	220
Market Data Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	12	11
Market Data Fees [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	12	11
Risk Exposure Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	4	8
Risk Exposure Fees [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	4	8
Payments For Order Flow [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	5	5
Payments For Order Flow [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	5	5
Minimum Activity Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7	5
Minimum Activity Fees [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7	5
Others [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7	7
Others [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	6	5
Others [Member] | Market Making [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1	$ 2

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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