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Debt Obligations (Senior Unsecured Notes) (Details)	12 Months Ended
	Dec. 31, 2018
Senior Notes | Senior Notes Excluding 2020 Notes
Debt Instrument [Line Items]
Aggregate principal amount purchased plus accrued and unpaid interest	101.00%

X

- 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

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

X

- Details

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