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Deferred Revenue (Estimated Deferred Revenue) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Deferred Revenue Arrangement [Line Items] |  |  |
2017 | $ 164 |  |
2018 | 61 |  |
2019 | 48 |  |
2020 | 39 |  |
2021 | 13 |  |
2022 and thereafter | 8 |  |
Deferred revenue estimated revenue to be recognized | 333 | $ 327 | $ 392
Initial Listing Revenues |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
2017 | 16 |  |
2018 | 14 |  |
2019 | 11 |  |
2020 | 8 |  |
2021 | 4 |  |
2022 and thereafter | 1 |  |
Deferred revenue estimated revenue to be recognized | 54 | 59 | 54
Listing of Additional Shares Revenues |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
2017 | 21 |  |
2018 | 11 |  |
2019 | 4 |  |
2020 | 1 |  |
2021 | 0 |  |
2022 and thereafter | 0 |  |
Deferred revenue estimated revenue to be recognized | 37 | 53 | 78
Annual Renewal and Other Revenues |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
2017 | 57 |  |
2018 | 0 |  |
2019 | 0 |  |
2020 | 0 |  |
2021 | 0 |  |
2022 and thereafter | 0 |  |
Deferred revenue estimated revenue to be recognized | 57 | 28 | 52
Market Technology Revenues |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
2017 | 70 |  |
2018 | 36 |  |
2019 | 33 |  |
2020 | 30 |  |
2021 | 9 |  |
2022 and thereafter | 7 |  |
Deferred revenue estimated revenue to be recognized | $ 185 | $ 187 | $ 208

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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 One + 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 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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