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Debt Obligations (Other Credit Facilities) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Clearinghouse Credit Facilities
Debt Instrument [Line Items]
Credit facility, available liquidity	$ 172	$ 170

X

- Definition

Credit Facility Available Liquidity

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DebtInstrumentAxis=ndaq_ClearinghouseCreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: