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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

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- 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

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