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Revenue Recognition - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) obligation | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disaggregation of Revenue [Line Items] |  |  |
Number of performance obligations | obligation | 2 |  |
Number of performance obligations related to trade execution | obligation | 1 |  |
Rebates | $ 860 | $ 844 | $ 749
Total revenues | 6,547 | 6,276 | 5,843
Transaction and clearing, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 3,627 | 3,483 | 3,131
Trading and Clearing Segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 3,887 | 3,717 | 3,333
Services transferred over time | Trading and Clearing Segment | Transaction and clearing, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 247 | $ 248 | $ 226

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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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