v2.4.0.6

Subsequent Event (Details) (USD $) In Millions, unless otherwise specified					1 Months Ended
	Mar. 31, 2013 SEC Reserve Matter [Member]	Apr. 30, 2013 TOM [Member]	Apr. 30, 2013 eSpeed [Member]	Apr. 30, 2013 Subsequent Event [Member] TOM [Member]	Apr. 30, 2013 Subsequent Event [Member] eSpeed [Member]
Subsequent Event [Line Items]
Contingency, accrual	$ 10
Percentage of acquired ownership interest		25.00%	100.00%	25.00%
Option to acquire additional ownership percentage				25.10%
Business acquisition, cash paid					$ 750
Future common stock issuance, payment term					15 years
Expected annual issuance of common stock					1

X

- Definition

Business Acquisition Additional Equity Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	ndaq_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Business Acquisition Contingent Consideration Expected Annual Future Issuance Of Common Stock

+ References

No definition available.

+ Details

Name:	ndaq_BusinessAcquisitionContingentConsiderationExpectedAnnualFutureIssuanceOfCommonStock
Namespace Prefix:	ndaq_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Business Acquisition Contingent Consideration Future Issuance Of Common Stock Payment Term

+ References

No definition available.

+ Details

Name:	ndaq_BusinessAcquisitionContingentConsiderationFutureIssuanceOfCommonStockPaymentTerm
Namespace Prefix:	ndaq_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cash paid to acquire the entity.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Percentage of voting equity interests acquired in the business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration