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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue from Contract with Customer, Excluding Assessed Tax	$ 222	$ 204	$ 643	$ 681
Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	221	203	640	676
Market Making [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		1	1	4
Corporate [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1		2	1
United States [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	158	145	460	488
United States [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	157	144	457	483
United States [Member] | Market Making [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		1	1	4
United States [Member] | Corporate [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1		2	1
International [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	64	59	183	193
International [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	64	59	183	193
Commissions [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	187	167	538	572
Commissions [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	187	167	538	572
Market Data Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	11	12	34	34
Market Data Fees [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	11	12	34	34
Risk Exposure Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	4	5	13	20
Risk Exposure Fees [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	4	5	13	20
Payments For Order Flow [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	5	6	16	16
Payments For Order Flow [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	5	6	16	16
Minimum Activity Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7	6	20	16
Minimum Activity Fees [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7	6	20	16
Others [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	8	8	22	23
Others [Member] | Electronic Brokerage [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7	7	19	18
Others [Member] | Market Making [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 1	1	4
Others [Member] | Corporate [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1		$ 2	$ 1

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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