v2.4.0.8

Clearing Operations (Schedule of Derivative Contracts Outstanding Additional Information) (Details) | 9 Months Ended
--- | ---
Sep. 30, 2013 TW | Sep. 30, 2012 TW
Clearing Operations [Abstract] |  |
Total volume in cleared power, in Terawatt hours (TWh) | 1,247 | 1,250

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