Organization and Nature of Operations	3 Months Ended
Organization and Nature of Operations	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Nature of Operations	Organization and Nature of Operations Nasdaq is a global technology company serving the capital markets and other industries. Our diverse offerings of data, analytics, software and services enables clients to optimize and execute their business vision with confidence. We manage, operate and provide our products and services in four business segments: Market Services, Corporate Platforms, Investment Intelligence and Market Technology. Market Services Our Market Services segment includes our Equity Derivative Trading and Clearing, Cash Equity Trading, FICC and Trade Management Services businesses. We operate multiple exchanges and other marketplace facilities across several asset classes, including derivatives, commodities, cash equity, debt, structured products and ETPs. In addition, in certain countries where we operate exchanges, we also provide broker services, clearing, settlement and central depository services. In January 2020, we commenced an orderly wind-down of our Nordic broker services operations business. We expect this wind-down to continue through 2021. Also, in February 2021, we announced that we entered into a purchase and sale agreement, or the Purchase Agreement, to sell our U.S. Fixed Income business and as a result, this business has been classified as held for sale as of March 31, 2021. See Note 5, “Assets and Liabilities Held for Sale,” for further discussion. Our transaction-based platforms provide market participants with the ability to access, process, display and integrate orders and quotes. The platforms allow the routing and execution of buy and sell orders as well as the reporting of transactions, providing fee-based revenues. In the U.S., we operate six options exchanges and three cash equity exchanges. The Nasdaq Stock Market, the largest of our cash equities exchanges, is the largest single venue of liquidity for trading U.S.-listed cash equities. The U.S. portion of Nasdaq Fixed Income includes an electronic platform for trading of U.S. Treasuries and we also operate a Canadian exchange for the trading of certain Canadian-listed securities. As noted above, in February 2021, we announced that we entered into a Purchase Agreement to sell our U.S. Fixed Income business. In Europe, we operate exchanges in Stockholm (Sweden), Copenhagen (Denmark), Helsinki (Finland), and Reykjavik (Iceland), as well as the clearing operations of Nasdaq Clearing, as Nasdaq Nordic. We also operate exchanges in Tallinn (Estonia), Riga (Latvia) and Vilnius (Lithuania) as Nasdaq Baltic. Collectively, Nasdaq Nordic and Nasdaq Baltic offer trading in cash equities, depository receipts, warrants, convertibles, rights, fund units and ETFs, as well as trading and clearing of derivatives and clearing of resale and repurchase agreements. The European portion of Nasdaq Fixed Income provides a wide range of products and services, such as trading and clearing, for fixed income products in Sweden, Denmark, Finland, Iceland, Estonia, Lithuania and Latvia. Nasdaq Commodities is the brand name for Nasdaq’s European commodity-related products and services. Nasdaq Commodities’ offerings include derivatives in power, natural gas and carbon emission markets, seafood, electricity certificates and clearing services. These products are listed on Nasdaq Oslo ASA, except for seafood, which is listed on Fishpool, a third party platform. Through our Trade Management Services business, we provide market participants with a wide variety of alternatives for connecting to and accessing our markets. Our marketplaces may be accessed via a number of different protocols used for quoting, order entry, trade reporting, and connectivity to various data feeds. We also offer the Nasdaq Workstation, a browser-based, front-end interface that allows market participants to view data and enter orders, quotes and trade reports. In addition, we offer a variety of add-on compliance tools to help firms comply with regulatory requirements. We provide colocation services to market participants, whereby we offer firms cabinet space and power to house their own equipment and servers within our data centers. Additionally, we offer a number of wireless connectivity offerings between select data centers using millimeter wave and microwave technology. Our broker services operations business primarily offers technology and customized securities administration solutions to financial participants in the Nordic market. As noted above, we have commenced an orderly wind-down of our Nordic broker services operations business that will continue through 2021. Corporate Platforms Our Corporate Platforms segment includes our Listing Services and IR & ESG Services businesses. These businesses deliver critical capital market and governance solutions across the lifecycle of public and private companies. Our Listing Services business includes our U.S. and European Listing Services businesses. We operate a variety of listing platforms around the world to provide multiple global capital raising solutions for private and public companies. Our main listing markets are The Nasdaq Stock Market and the Nasdaq Nordic and Nasdaq Baltic exchanges. Through Nasdaq First North, our Nordic and Baltic operations also offer alternative marketplaces for smaller companies and growth companies. Our Listing Services business also includes NPM, which provides liquidity solutions for private companies to enable employees, investors, and companies to execute transactions. We are continuing to grow our U.S. Corporate Bond exchange for the listing of corporate bonds. This exchange operates pursuant to The Nasdaq Stock Market exchange license and is powered by the NFF. As of March 31, 2021, 92 corporate bonds were listed on the Corporate Bond exchange. We also continue to grow the Nasdaq Sustainable Bond Network, a platform for increased transparency in the global sustainable bond markets. As of March 31, 2021, there were 3,667 total listings on The Nasdaq Stock Market, including 410 ETPs. The combined market capitalization was approximately $23.0 trillion. In Europe, the Nasdaq Nordic and Nasdaq Baltic exchanges, together with Nasdaq First North, were home to 1,090 listed companies with a combined market capitalization of approximately $2.2 trillion. Our IR & ESG Services business includes our Investor Relations Intelligence and Governance Solutions businesses, which serve both public and private companies and organizations. Our public company clients can be companies listed on our exchanges or other U.S. and global exchanges. We help organizations enhance their ability to understand and expand their global shareholder base, improve corporate governance, and navigate the evolving ESG landscape through our suite of advanced technology, analytics, reporting and consultative services. We provide clients with counsel on a range of governance and sustainability-related issues. Our offerings also include our ESG Advisory service and our board assessment and collaboration technology. Investment Intelligence Our Investment Intelligence segment includes our Market Data, Index and Analytics businesses. Our Market Data business sells and distributes historical and real-time market data to the sell-side, the institutional investing community, retail online brokers, proprietary trading shops, other venues, internet portals and data distributors. Our market data products enhance transparency of market activity within our exchanges and provide critical information to professional and non-professional investors globally. Additionally, our Nasdaq Cloud Data Service provides a flexible and efficient method of delivery for real-time exchange data and other financial information. Our Index business develops and licenses Nasdaq-branded indexes and financial products. We also license cash-settled options, futures and options on futures on our indexes. As of March 31, 2021, 349 ETPs listed in 30 countries and exchanges tracked a Nasdaq index and accounted for $385 billion in AUM. Our Analytics business provides asset managers, investment consultants and institutional asset owners with information and analytics to make data-driven investment decisions, deploy their resources more productively, and provide liquidity solutions for private funds. Through eVestment and Solovis, we provide a suite of cloud-based solutions that help institutional investors and consultants conduct pre-investment due diligence, and monitor their portfolios post-investment. The eVestment platform also enables asset managers to market their institutional products worldwide. Market Technology Our Market Technology segment includes our Marketplace Infrastructure Technology business, which includes our solutions for the full trade life cycle to market infrastructure operators, banks and brokers, and non-financial market operators and our Anti Financial Crime Technology business, which includes our SaaS offering providing surveillance, risk management, and Verafin's anti-money laundering and fraud technology solutions. Our Market Technology segment is a leading global technology solutions provider and partner to exchanges, clearing organizations, central securities depositories, regulators, banks, brokers, buy-side firms and corporate businesses. Our Market Technology business is the sales channel for our complete global offering to other marketplaces. Our marketplace infrastructure technology solutions power over 130 market infrastructure operators and new market clients in more than 50 countries and handles a wide array of assets, including but not limited to cash equities, equity derivatives, currencies, various interest-bearing securities, commodities, energy products and digital currencies. Our solutions can also be used in the creation of new asset classes, and non-capital markets customers, including those in insurance liabilities securitization, cryptocurrencies and sports wagering. We also continue to extend our anti-financial crime strategy. Our Nasdaq Trade Surveillance solution is a managed service designed for brokers and other market participants to assist them in complying with market rules, regulations and internal market surveillance policies. We have added a cloud-deployed anti-money laundering offering with an automated investigator tool for retail banks, the Nasdaq Automated Investigator. Additionally, in February 2021, we completed the acquisition of Verafin, a SaaS technology provider of anti-financial crime management solutions that provides a cloud-based platform to help detect, investigate, and report money laundering and financial fraud. See “2021 Acquisition,” of Note 4, “Acquisitions,” for further discussion. Nasdaq’s market technology is utilized by leading markets in the U.S., Europe and Asia as well as emerging markets in the Middle East, Latin America, and Africa. Market participants leverage our surveillance technology globally to manage their integrity obligations and assist them in complying with market rules, regulations and internal market surveillance policies.