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Segment Reporting - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) segment member	Dec. 31, 2018 USD ($) member	Dec. 31, 2017 USD ($) member
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Revenue	$ 6,547	$ 6,276	$ 5,843
Trading and Clearing Segment
Segment Reporting Information [Line Items]
Revenue	$ 3,887	$ 3,717	$ 3,333
Revenue | Trading and Clearing Segment
Segment Reporting Information [Line Items]
Number of members | member	1	1	2
Revenue	$ 368	$ 406	$ 477
Concentration risk, percentage	14.00%	17.00%	22.00%

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Number of Members

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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