Acquisition Recorded As Deferred Tax Asset

No definition available.

Name:	ndaq_AcquisitionRecordedAsDeferredTaxAsset
Namespace Prefix:	ndaq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ndaq_EVestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
Subsequent Events (Details) - USD ($) $ in Millions	Oct. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Oct. 27, 2017
Subsequent Event [Line Items]
Payments to acquire businesses, net of cash acquired		$ 0	$ 1,460
Subsequent Event \| eVestment
Subsequent Event [Line Items]
Cash consideration	$ 705
Payments to acquire businesses, net of cash acquired	$ 744
Purchase price allocation deferred tax assets				$ 39