v2.4.0.8

Clearing Operations (Schedule of Derivative Contracts Outstanding Additional Information) (Details) | 3 Months Ended
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Mar. 31, 2014 TW | Mar. 31, 2013 TW
Clearing Operations [Abstract] |  |
Total volume in cleared power, in Terawatt hours (TWh) | 429 | 460

X
- Details
Name: | ndaq_ClearingOperationsAbstract
Namespace Prefix: | ndaq_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total volume in cleared power. + References No definition available. + Details
Name: | ndaq_TotalVolumeInClearedPower
Namespace Prefix: | ndaq_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration