Revenue Recognition - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) obligation	Jun. 30, 2017 USD ($)
Disaggregation of Revenue [Line Items]
Number of performance obligations \| obligation			2
Number of performance obligations related to trade execution \| obligation			1
Period of recognition of performance obligations	2 years		2 years
Trading and clearing segment revenues	$ 1,556	$ 1,496	$ 3,136	$ 2,967
Interest rates and other financial futures and options contracts
Disaggregation of Revenue [Line Items]
Trading and clearing segment revenues	864	817	1,762	1,615
Trading and Clearing Segment
Disaggregation of Revenue [Line Items]
Trading and clearing segment revenues	919	866	1,870	1,709
Trading and Clearing Segment \| Interest rates and other financial futures and options contracts
Disaggregation of Revenue [Line Items]
Trading and clearing segment revenues	$ 864	817	$ 1,762	1,615
Trading and Clearing Segment \| Interest rates and other financial futures and options contracts \| Transferred over Time
Disaggregation of Revenue [Line Items]
Period of recognition of performance obligations	1 month		1 month
Trading and clearing segment revenues	$ 65	$ 59	$ 128	$ 116

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Revenue Recognition, Number of Performance Obligations

+ References

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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://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
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-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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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

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