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Organization and Nature of Operations (Details)
$ in Billions
 9 Months Ended
Sep. 30, 2018
USD ($)
marketplace
segment
company
exchange
exchange_traded_product
country
Organization And Basis Of Presentation [Line Items]  
Number of operating segments | segment 4
Market Services  
Organization And Basis Of Presentation [Line Items]  
Number of derivative exchanges listing commodities offerings | exchange 2
Market Services | United States | Options Markets  
Organization And Basis Of Presentation [Line Items]  
Number of exchanges | exchange 6
Market Services | United States | Cash Equities Trading Markets  
Organization And Basis Of Presentation [Line Items]  
Number of exchanges | exchange 3
Corporate Services  
Organization And Basis Of Presentation [Line Items]  
Total number of listings on The Nasdaq Stock Market | company 3,049
ETPs and other listings listed on Nasdaq Stock Market | company 390
Approximate combined market capitalization, U.S. | $ $ 13,400
Total number of listed companies within Nordic and Baltic exchanges | company 1,010
Approximate combined market capitalization within Nordic and Baltic exchanges | $ $ 1,500
Information Services  
Organization And Basis Of Presentation [Line Items]  
Number of exchange traded products licensed to Nasdaq's Indexes | exchange_traded_product 358
Assets management value | $ $ 206
Market Technology  
Organization And Basis Of Presentation [Line Items]  
Number of exchanges | marketplace 100
Number of countries services are provided (more than) | country 50