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Deferred Revenue (Estimated Deferred Revenue) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
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Deferred Revenue Arrangement [Line Items] |  |  |  |
2017 | $ 301 |  |  |
2018 | 67 |  |  |
2019 | 50 |  |  |
2020 | 40 |  |  |
2021 | 18 |  |  |
2022 and thereafter | 10 |  |  |
Deferred revenue estimated revenue to be recognized | 486 | $ 333 | $ 492 | $ 327
Initial Listing Revenues |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
2017 | 12 |  |  |
2018 | 14 |  |  |
2019 | 12 |  |  |
2020 | 8 |  |  |
2021 | 5 |  |  |
2022 and thereafter | 2 |  |  |
Deferred revenue estimated revenue to be recognized | 53 | 54 | 56 | 59
Listing of Additional Shares Revenues |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
2017 | 15 |  |  |
2018 | 11 |  |  |
2019 | 5 |  |  |
2020 | 2 |  |  |
2021 | 0 |  |  |
2022 and thereafter | 0 |  |  |
Deferred revenue estimated revenue to be recognized | 33 | 37 | 48 | 53
Annual Renewal and Other Revenues |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
2017 | 216 |  |  |
2018 | 4 |  |  |
2019 | 1 |  |  |
2020 | 0 |  |  |
2021 | 0 |  |  |
2022 and thereafter | 0 |  |  |
Deferred revenue estimated revenue to be recognized | 221 | 57 | 200 | 28
Market Technology Revenues |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
2017 | 58 |  |  |
2018 | 38 |  |  |
2019 | 32 |  |  |
2020 | 30 |  |  |
2021 | 13 |  |  |
2022 and thereafter | 8 |  |  |
Deferred revenue estimated revenue to be recognized | $ 179 | $ 185 | $ 188 | $ 187

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- Definition Deferred Revenue Estimated Revenue, Expected Recognized In Remainder Of Year + References No definition available. + Details
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- Definition Deferred Revenue Estimated Revenue Expected Recognized In Year Five + References No definition available. + Details
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- Definition Deferred Revenue Estimated Revenue Expected Recognized In Year Four + References No definition available. + Details
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- Definition Deferred Revenue Estimated Revenue Expected Recognized In Year Three + References No definition available. + Details
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- Definition Deferred Revenue Estimated Revenue Expected Recognized In Year Two + References No definition available. + Details
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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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- Definition 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. + References No definition available. + Details
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