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