Deferred Revenue Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Movement in Deferred Revenue [Roll Forward]
Deferred revenue balance at December 31, 2014	$ 136us-gaap_DeferredRevenue
Additions	440us-gaap_DeferredRevenueAdditions
Amortization	(126)
Deferred revenue balance at March 31, 2015	450us-gaap_DeferredRevenue
Deferred revenue	367us-gaap_DeferredRevenueCurrent	69us-gaap_DeferredRevenueCurrent
Deferred Revenue, Noncurrent	83us-gaap_DeferredRevenueNoncurrent
Annual Listing Fee Revenue
Movement in Deferred Revenue [Roll Forward]
Deferred revenue balance at December 31, 2014	0
Additions	354
Amortization	(89)
Deferred revenue balance at March 31, 2015	265
Original Listing Fee Revenues
Movement in Deferred Revenue [Roll Forward]
Deferred revenue balance at December 31, 2014	47
Additions	6
Amortization	(2)
Deferred revenue balance at March 31, 2015	51
Other Listing Fee Revenues
Movement in Deferred Revenue [Roll Forward]
Deferred revenue balance at December 31, 2014	34
Additions	19
Amortization	(3)
Deferred revenue balance at March 31, 2015	50
Data Services Fees and Other Revenues
Movement in Deferred Revenue [Roll Forward]
Deferred revenue balance at December 31, 2014	55
Additions	61
Amortization	(32)
Deferred revenue balance at March 31, 2015	$ 84

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

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 Response)

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

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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.

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- Definition

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ 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=27012821&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 8

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

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- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. 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.

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- Definition

Amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. Deferred revenue is a liability 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.

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