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Deferred Revenue (Changes in Deferred Revenue) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Movement in Deferred Revenue [Roll Forward] |  |
Beginning Balance | $ 327 | $ 392
Additions | 864 | 626
Amortization | (849) | (674)
Translation adjustment | (9) | (17)
Ending Balance | 333 | 327
Initial Listing Revenues |  |
Movement in Deferred Revenue [Roll Forward] |  |
Beginning Balance | 59 | 54
Additions | 13 | 21
Amortization | (18) | (16)
Translation adjustment | 0 | 0
Ending Balance | 54 | 59
Listing of Additional Shares Revenues |  |
Movement in Deferred Revenue [Roll Forward] |  |
Beginning Balance | 53 | 78
Additions | 12 | 10
Amortization | (28) | (35)
Translation adjustment | 0 | 0
Ending Balance | 37 | 53
Annual Renewal and Other Revenues |  |
Movement in Deferred Revenue [Roll Forward] |  |
Beginning Balance | 28 | 52
Additions | 606 | 403
Amortization | (576) | (424)
Translation adjustment | (1) | (3)
Ending Balance | 57 | 28
Market Technology Revenues |  |
Movement in Deferred Revenue [Roll Forward] |  |
Beginning Balance | 187 | 208
Additions | 233 | 192
Amortization | (227) | (199)
Translation adjustment | (8) | (14)
Ending Balance | $ 185 | $ 187

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- Definition Deferred Revenue Foreign Currency Translation Adjustment + 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 Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date 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.4(a).Q1) -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.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + 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.4(a).Q1 Response)) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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