<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:exch="http://xbrl.sec.gov/exch/2025"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:t="http://att.com/20260803"
  xmlns:us-gaap="http://fasb.org/us-gaap/2025"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="t-20260803.xsd" xlink:type="simple"/>
    <context id="duration_2026-08-03_to_2026-08-03">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesAPreferredStockMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:SeriesAPreferredStockMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesCPreferredStockMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:SeriesCPreferredStockMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc1800GlobalNotesDueSeptember52026Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc1800GlobalNotesDueSeptember52026Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2900GlobalNotesDueDecember42026Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc2900GlobalNotesDueDecember42026Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTIncFloatingRateGlobalNotesDueSeptember162027Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTIncFloatingRateGlobalNotesDueSeptember162027Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc1600GlobalNotesDueMay192028Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc1600GlobalNotesDueMay192028Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2350GlobalNotesDueSeptember52029Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc2350GlobalNotesDueSeptember52029Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4375GlobalNotesDueSeptember142029Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc4375GlobalNotesDueSeptember142029Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2600GlobalNotesDueDecember172029Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc2600GlobalNotesDueDecember172029Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc0800GlobalNotesDueMarch42030Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc0800GlobalNotesDueMarch42030Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc.3.150GlobalNotesDueJune12030Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc.3.150GlobalNotesDueJune12030Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3950GlobalNotesDueApril302031Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc3950GlobalNotesDueApril302031Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2050GlobalNotesDueMay192032Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc2050GlobalNotesDueMay192032Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3550GlobalNotesDueDecember172032Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc3550GlobalNotesDueDecember172032Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3.600GlobalNotesDueJune12033Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc3.600GlobalNotesDueJune12033Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc5200GlobalNotesDueNovember182033Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc5200GlobalNotesDueNovember182033Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3375GlobalNotesDueMarch152034Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc3375GlobalNotesDueMarch152034Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4300GlobalNotesDueNovember182034Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc4300GlobalNotesDueNovember182034Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2450GlobalNotesDueMarch152035Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc2450GlobalNotesDueMarch152035Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3150GlobalNotesDueSeptember42036Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc3150GlobalNotesDueSeptember42036Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4.050GlobalNotesDueJune12037Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc4.050GlobalNotesDueJune12037Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2600GlobalNotesDueMay192038Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc2600GlobalNotesDueMay192038Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc1800GlobalNotesDueSeptember142039Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc1800GlobalNotesDueSeptember142039Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc7000GlobalNotesDueApril302040Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc7000GlobalNotesDueApril302040Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4250GlobalNotesDueJune12043Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc4250GlobalNotesDueJune12043Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4875GlobalNotesDueJune12044Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc4875GlobalNotesDueJune12044Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4000GlobalNotesDueJune12049Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc4000GlobalNotesDueJune12049Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4250GlobalNotesDueMarch12050Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc4250GlobalNotesDueMarch12050Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3750GlobalNotesDueSeptember12050Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc3750GlobalNotesDueSeptember12050Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc5350GlobalNotesDueNovember12066Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">t:ATTInc5350GlobalNotesDueNovember12066Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_dei-EntityListingsExchangeAxis_exch-XNYS_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:CommonStockMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:EntityListingsExchangeAxis">exch:XNYS</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <context id="duration_2026-08-03_to_2026-08-03_dei-EntityListingsExchangeAxis_exch-XCHI_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000732717</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:CommonStockMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:EntityListingsExchangeAxis">exch:XCHI</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-08-03</startDate>
            <endDate>2026-08-03</endDate>
        </period>
    </context>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_dei-EntityListingsExchangeAxis_exch-XCHI_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="Hidden_dei_SecurityExchangeName_duration_2026-08-03_to_2026-08-03_dei-EntityListingsExchangeAxis_exch-XCHI_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember">CHX</dei:SecurityExchangeName>
    <dei:EntityCentralIndexKey
      contextRef="duration_2026-08-03_to_2026-08-03"
      id="Hidden_dei_EntityCentralIndexKey">0000732717</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag
      contextRef="duration_2026-08-03_to_2026-08-03"
      id="Hidden_dei_AmendmentFlag">false</dei:AmendmentFlag>
    <dei:DocumentType contextRef="duration_2026-08-03_to_2026-08-03" id="Fact_1">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="duration_2026-08-03_to_2026-08-03" id="Fact_0">2026-08-03</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-763">AT&amp;T INC.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-764">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-765">001-08610</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-766">43-1301883</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1 contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-767">208 S. Akard St.</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-768">Dallas</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-769">TX</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-770">75202</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-771">210</dei:CityAreaCode>
    <dei:LocalPhoneNumber contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-772">821-4105</dei:LocalPhoneNumber>
    <dei:WrittenCommunications contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-773">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-774">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-775">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-776">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_dei-EntityListingsExchangeAxis_exch-XNYS_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="Fact_2">Common Shares (Par Value $1.00 Per Share)</dei:Security12bTitle>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_dei-EntityListingsExchangeAxis_exch-XCHI_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="Fact_5">Common Shares (Par Value $1.00 Per Share)</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_dei-EntityListingsExchangeAxis_exch-XNYS_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="Fact_3">T</dei:TradingSymbol>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_dei-EntityListingsExchangeAxis_exch-XCHI_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="Fact_6">T</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_dei-EntityListingsExchangeAxis_exch-XNYS_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="Fact_4">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesAPreferredStockMember"
      id="ixv-782">Depositary Shares, each representing a 1/1000th interest in a share of 5.000% Perpetual Preferred Stock, Series A</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesAPreferredStockMember"
      id="ixv-783">T PRA</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesAPreferredStockMember"
      id="ixv-784">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesCPreferredStockMember"
      id="ixv-785">Depositary Shares, each representing a 1/1000th interest in a share of 4.750% Perpetual Preferred Stock, Series C</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesCPreferredStockMember"
      id="ixv-786">T PRC</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesCPreferredStockMember"
      id="ixv-787">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc1800GlobalNotesDueSeptember52026Member"
      id="ixv-788">AT&amp;T Inc. 1.800% Global Notes due September&#160;5, 2026</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc1800GlobalNotesDueSeptember52026Member"
      id="ixv-789">T&#160;26D</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc1800GlobalNotesDueSeptember52026Member"
      id="ixv-790">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2900GlobalNotesDueDecember42026Member"
      id="ixv-791">AT&amp;T Inc. 2.900% Global Notes due December&#160;4, 2026</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2900GlobalNotesDueDecember42026Member"
      id="ixv-792">T&#160;26A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2900GlobalNotesDueDecember42026Member"
      id="ixv-793">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTIncFloatingRateGlobalNotesDueSeptember162027Member"
      id="ixv-794">AT&amp;T Inc. Floating Rate Global Notes due September&#160;16, 2027</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTIncFloatingRateGlobalNotesDueSeptember162027Member"
      id="ixv-795">T&#160;27C</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTIncFloatingRateGlobalNotesDueSeptember162027Member"
      id="ixv-796">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc1600GlobalNotesDueMay192028Member"
      id="ixv-797">AT&amp;T Inc. 1.600% Global Notes due May&#160;19, 2028</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc1600GlobalNotesDueMay192028Member"
      id="ixv-798">T&#160;28C</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc1600GlobalNotesDueMay192028Member"
      id="ixv-799">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2350GlobalNotesDueSeptember52029Member"
      id="ixv-800">AT&amp;T Inc. 2.350% Global Notes due September&#160;5, 2029</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2350GlobalNotesDueSeptember52029Member"
      id="ixv-801">T&#160;29D</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2350GlobalNotesDueSeptember52029Member"
      id="ixv-802">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4375GlobalNotesDueSeptember142029Member"
      id="ixv-803">AT&amp;T Inc. 4.375% Global Notes due September&#160;14, 2029</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4375GlobalNotesDueSeptember142029Member"
      id="ixv-804">T&#160;29B</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4375GlobalNotesDueSeptember142029Member"
      id="ixv-805">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2600GlobalNotesDueDecember172029Member"
      id="ixv-806">AT&amp;T Inc. 2.600% Global Notes due December&#160;17, 2029</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2600GlobalNotesDueDecember172029Member"
      id="ixv-807">T&#160;29A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2600GlobalNotesDueDecember172029Member"
      id="ixv-808">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc0800GlobalNotesDueMarch42030Member"
      id="ixv-809">AT&amp;T Inc. 0.800% Global Notes due March&#160;4, 2030</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc0800GlobalNotesDueMarch42030Member"
      id="ixv-810">T&#160;30B</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc0800GlobalNotesDueMarch42030Member"
      id="ixv-811">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc.3.150GlobalNotesDueJune12030Member"
      id="ixv-812">AT&amp;T Inc. 3.150% Global Notes due June&#160;1, 2030</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc.3.150GlobalNotesDueJune12030Member"
      id="ixv-813">T&#160;30C</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc.3.150GlobalNotesDueJune12030Member"
      id="ixv-814">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3950GlobalNotesDueApril302031Member"
      id="ixv-815">AT&amp;T Inc. 3.950% Global Notes due April&#160;30, 2031</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3950GlobalNotesDueApril302031Member"
      id="ixv-816">T&#160;31F</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3950GlobalNotesDueApril302031Member"
      id="ixv-817">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2050GlobalNotesDueMay192032Member"
      id="ixv-818">AT&amp;T Inc. 2.050% Global Notes due May&#160;19, 2032</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2050GlobalNotesDueMay192032Member"
      id="ixv-819">T&#160;32A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2050GlobalNotesDueMay192032Member"
      id="ixv-820">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3550GlobalNotesDueDecember172032Member"
      id="ixv-821">AT&amp;T Inc. 3.550% Global Notes due December&#160;17, 2032</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3550GlobalNotesDueDecember172032Member"
      id="ixv-822">T&#160;32</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3550GlobalNotesDueDecember172032Member"
      id="ixv-823">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3.600GlobalNotesDueJune12033Member"
      id="ixv-824">AT&amp;T Inc. 3.600% Global Notes due June&#160;1, 2033</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3.600GlobalNotesDueJune12033Member"
      id="ixv-825">T&#160;33A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3.600GlobalNotesDueJune12033Member"
      id="ixv-826">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc5200GlobalNotesDueNovember182033Member"
      id="ixv-827">AT&amp;T Inc. 5.200% Global Notes due November&#160;18, 2033</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc5200GlobalNotesDueNovember182033Member"
      id="ixv-828">T&#160;33</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc5200GlobalNotesDueNovember182033Member"
      id="ixv-829">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3375GlobalNotesDueMarch152034Member"
      id="ixv-830">AT&amp;T Inc. 3.375% Global Notes due March&#160;15, 2034</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3375GlobalNotesDueMarch152034Member"
      id="ixv-831">T&#160;34</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3375GlobalNotesDueMarch152034Member"
      id="ixv-832">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4300GlobalNotesDueNovember182034Member"
      id="ixv-833">AT&amp;T Inc. 4.300% Global Notes due November&#160;18, 2034</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4300GlobalNotesDueNovember182034Member"
      id="ixv-834">T&#160;34C</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4300GlobalNotesDueNovember182034Member"
      id="ixv-835">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2450GlobalNotesDueMarch152035Member"
      id="ixv-836">AT&amp;T Inc. 2.450% Global Notes due March&#160;15, 2035</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2450GlobalNotesDueMarch152035Member"
      id="ixv-837">T&#160;35</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2450GlobalNotesDueMarch152035Member"
      id="ixv-838">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3150GlobalNotesDueSeptember42036Member"
      id="ixv-839">AT&amp;T Inc. 3.150% Global Notes due September&#160;4, 2036</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3150GlobalNotesDueSeptember42036Member"
      id="ixv-840">T&#160;36A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3150GlobalNotesDueSeptember42036Member"
      id="ixv-841">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4.050GlobalNotesDueJune12037Member"
      id="ixv-842">AT&amp;T Inc. 4.050% Global Notes due June&#160;1, 2037</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4.050GlobalNotesDueJune12037Member"
      id="ixv-843">T&#160;37B</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4.050GlobalNotesDueJune12037Member"
      id="ixv-844">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2600GlobalNotesDueMay192038Member"
      id="ixv-845">AT&amp;T Inc. 2.600% Global Notes due May&#160;19, 2038</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2600GlobalNotesDueMay192038Member"
      id="ixv-846">T&#160;38C</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc2600GlobalNotesDueMay192038Member"
      id="ixv-847">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc1800GlobalNotesDueSeptember142039Member"
      id="ixv-848">AT&amp;T Inc. 1.800% Global Notes due September&#160;14, 2039</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc1800GlobalNotesDueSeptember142039Member"
      id="ixv-849">T&#160;39B</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc1800GlobalNotesDueSeptember142039Member"
      id="ixv-850">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc7000GlobalNotesDueApril302040Member"
      id="ixv-851">AT&amp;T Inc. 7.000% Global Notes due April&#160;30, 2040</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc7000GlobalNotesDueApril302040Member"
      id="ixv-852">T&#160;40</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc7000GlobalNotesDueApril302040Member"
      id="ixv-853">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4250GlobalNotesDueJune12043Member"
      id="ixv-854">AT&amp;T Inc. 4.250% Global Notes due June&#160;1, 2043</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4250GlobalNotesDueJune12043Member"
      id="ixv-855">T&#160;43</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4250GlobalNotesDueJune12043Member"
      id="ixv-856">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4875GlobalNotesDueJune12044Member"
      id="ixv-857">AT&amp;T Inc. 4.875% Global Notes due June&#160;1, 2044</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4875GlobalNotesDueJune12044Member"
      id="ixv-858">T&#160;44</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4875GlobalNotesDueJune12044Member"
      id="ixv-859">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4000GlobalNotesDueJune12049Member"
      id="ixv-860">AT&amp;T Inc. 4.000% Global Notes due June&#160;1, 2049</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4000GlobalNotesDueJune12049Member"
      id="ixv-861">T&#160;49A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4000GlobalNotesDueJune12049Member"
      id="ixv-862">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4250GlobalNotesDueMarch12050Member"
      id="ixv-863">AT&amp;T Inc. 4.250% Global Notes due March&#160;1, 2050</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4250GlobalNotesDueMarch12050Member"
      id="ixv-864">T&#160;50</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc4250GlobalNotesDueMarch12050Member"
      id="ixv-865">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3750GlobalNotesDueSeptember12050Member"
      id="ixv-866">AT&amp;T Inc. 3.750% Global Notes due September&#160;1, 2050</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3750GlobalNotesDueSeptember12050Member"
      id="ixv-867">T&#160;50A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc3750GlobalNotesDueSeptember12050Member"
      id="ixv-868">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc5350GlobalNotesDueNovember12066Member"
      id="ixv-869">AT&amp;T Inc. 5.350% Global Notes due November&#160;1, 2066</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc5350GlobalNotesDueNovember12066Member"
      id="ixv-870">TBB</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-03_to_2026-08-03_us-gaap-StatementClassOfStockAxis_t-ATTInc5350GlobalNotesDueNovember12066Member"
      id="ixv-871">NYSE</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany contextRef="duration_2026-08-03_to_2026-08-03" id="ixv-872">false</dei:EntityEmergingGrowthCompany>
</xbrl>
