<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2021"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:ndaq="http://www.nasdaq.com/20221019"
  xmlns:us-gaap="http://fasb.org/us-gaap/2021-01-31"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="ndaq-20221019.xsd" xlink:type="simple"/>
    <context id="duration_2022-10-19_to_2022-10-19">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001120193</identifier>
        </entity>
        <period>
            <startDate>2022-10-19</startDate>
            <endDate>2022-10-19</endDate>
        </period>
    </context>
    <context id="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-CommonStock.01parvaluepershareMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001120193</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">ndaq:CommonStock.01parvaluepershareMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-10-19</startDate>
            <endDate>2022-10-19</endDate>
        </period>
    </context>
    <context id="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-ZeroPointNineZeroZeroSeniorUnsecuredNotesDue2033Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001120193</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">ndaq:ZeroPointNineZeroZeroSeniorUnsecuredNotesDue2033Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-10-19</startDate>
            <endDate>2022-10-19</endDate>
        </period>
    </context>
    <context id="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-ZeroPointEightSevenFivePercentSeniorNotesDue2030Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001120193</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">ndaq:ZeroPointEightSevenFivePercentSeniorNotesDue2030Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-10-19</startDate>
            <endDate>2022-10-19</endDate>
        </period>
    </context>
    <context id="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-OnePointSevenFivePercentSeniorNotesDue2029Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001120193</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">ndaq:OnePointSevenFivePercentSeniorNotesDue2029Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-10-19</startDate>
            <endDate>2022-10-19</endDate>
        </period>
    </context>
    <dei:AmendmentFlag contextRef="duration_2022-10-19_to_2022-10-19">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey
      contextRef="duration_2022-10-19_to_2022-10-19"
      id="Hidden_dei_EntityCentralIndexKey">0001120193</dei:EntityCentralIndexKey>
    <dei:DocumentType contextRef="duration_2022-10-19_to_2022-10-19">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="duration_2022-10-19_to_2022-10-19">2022-10-19</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName contextRef="duration_2022-10-19_to_2022-10-19">Nasdaq, Inc.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode contextRef="duration_2022-10-19_to_2022-10-19">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber contextRef="duration_2022-10-19_to_2022-10-19">001-38855</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber contextRef="duration_2022-10-19_to_2022-10-19">52-1165937</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1 contextRef="duration_2022-10-19_to_2022-10-19">151 W. 42nd Street</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown contextRef="duration_2022-10-19_to_2022-10-19">New York</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince contextRef="duration_2022-10-19_to_2022-10-19">NY</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode contextRef="duration_2022-10-19_to_2022-10-19">10036</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode contextRef="duration_2022-10-19_to_2022-10-19">212</dei:CityAreaCode>
    <dei:LocalPhoneNumber contextRef="duration_2022-10-19_to_2022-10-19">401 8700</dei:LocalPhoneNumber>
    <dei:WrittenCommunications contextRef="duration_2022-10-19_to_2022-10-19">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial contextRef="duration_2022-10-19_to_2022-10-19">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer contextRef="duration_2022-10-19_to_2022-10-19">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer contextRef="duration_2022-10-19_to_2022-10-19">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle contextRef="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-CommonStock.01parvaluepershareMember">Common Stock, $0.01 par value per share</dei:Security12bTitle>
    <dei:TradingSymbol contextRef="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-CommonStock.01parvaluepershareMember">NDAQ</dei:TradingSymbol>
    <dei:SecurityExchangeName contextRef="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-CommonStock.01parvaluepershareMember">NASDAQ</dei:SecurityExchangeName>
    <dei:Security12bTitle contextRef="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-ZeroPointNineZeroZeroSeniorUnsecuredNotesDue2033Member">0.900% Senior Notes due 2033</dei:Security12bTitle>
    <dei:TradingSymbol contextRef="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-ZeroPointNineZeroZeroSeniorUnsecuredNotesDue2033Member">NDAQ33</dei:TradingSymbol>
    <dei:SecurityExchangeName contextRef="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-ZeroPointNineZeroZeroSeniorUnsecuredNotesDue2033Member">NASDAQ</dei:SecurityExchangeName>
    <dei:Security12bTitle contextRef="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-ZeroPointEightSevenFivePercentSeniorNotesDue2030Member">0.875% Senior Notes due 2030</dei:Security12bTitle>
    <dei:TradingSymbol contextRef="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-ZeroPointEightSevenFivePercentSeniorNotesDue2030Member">NDAQ30</dei:TradingSymbol>
    <dei:SecurityExchangeName contextRef="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-ZeroPointEightSevenFivePercentSeniorNotesDue2030Member">NASDAQ</dei:SecurityExchangeName>
    <dei:Security12bTitle contextRef="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-OnePointSevenFivePercentSeniorNotesDue2029Member">1.75% Senior Notes due 2029</dei:Security12bTitle>
    <dei:TradingSymbol contextRef="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-OnePointSevenFivePercentSeniorNotesDue2029Member">NDAQ29</dei:TradingSymbol>
    <dei:SecurityExchangeName contextRef="duration_2022-10-19_to_2022-10-19_us-gaap-StatementClassOfStockAxis_ndaq-OnePointSevenFivePercentSeniorNotesDue2029Member">NASDAQ</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany contextRef="duration_2022-10-19_to_2022-10-19">false</dei:EntityEmergingGrowthCompany>
</xbrl>
