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Debt Obligations (Senior Unsecured Notes) (Details) | 9 Months Ended
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Sep. 30, 2018
Senior Notes | Senior Notes Excluding 2020 Notes |
Debt Instrument [Line Items] |
Aggregate principal amount purchased plus accrued and unpaid interest | 101.00%

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- Definition Aggregate Principal Amount Purchased Plus Accrued And Unpaid Interest + References No definition available. + Details
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Namespace Prefix: | ndaq_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=ndaq_SeniorNotesExcluding2020NotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |