AT&T Inc. 3.550% Global Notes due December 17, 2032 ATT Inc 3.550% Global Notes Due December 17, 2032 [Member] ATT Inc 3.550% Global Notes Due December 17, 2032 AT&T Inc. 0.250% Global Notes due March 4, 2026 ATT Inc 0.250% Global Notes Due March 4, 2026 [Member] ATT Inc 0.250% Global Notes Due March 4, 2026 AT&T Inc. 3.750% Global Notes due September 1, 2050 ATT Inc 3.750% Global Notes Due September 1, 2050 [Member] ATT Inc 3.750% Global Notes Due September 1, 2050 Common Shares (Par Value $1.00 Per Share) Common Stock [Member] Pre-commencement Tender Offer Pre-commencement Tender Offer Soliciting Material Soliciting Material City Area Code City Area Code Entity Address, Postal Zip Code Entity Address, Postal Zip Code AT&T Inc. 4.250% Global Notes due June 1, 2043 ATT Inc 4.250% Global Notes Due June 1, 2043 [Member] ATT Inc 4.250% Global Notes Due June 1, 2043 AT&T Inc. 0.800% Global Notes due March 4, 2030 ATT Inc 0.800% Global Notes Due March 4, 2030 [Member] ATT Inc 0.800% Global Notes Due March 4, 2030 AT&T Inc. 1.600% Global Notes due May 19, 2028 ATT Inc 1.600% Global Notes Due May 19, 2028 [Member] ATT Inc 1.600% Global Notes Due May 19, 2028 AT&T Inc. 2.600% Global Notes due December 17, 2029 ATT Inc 2.600% Global Notes Due December 17, 2029 [Member] ATT Inc 2.600% Global Notes Due December 17, 2029 AT&T Inc. 5.200% Global Notes due November 18, 2033 ATT Inc 5.200% Global Notes Due November 18, 2033 [Member] ATT Inc 5.200% Global Notes Due November 18, 2033 AT&T Inc. 4.000% Global Notes due June 1, 2049 ATT Inc 4.000% Global Notes Due June 1, 2049 [Member] ATT Inc 4.000% Global Notes Due June 1, 2049 AT&T Inc. Floating Rate Global Notes due March 6, 2025 ATT Inc. Floating Rate Global Notes due March 6, 2025 [Member] ATT Inc. Floating Rate Global Notes due March 6, 2025 Security Exchange Name Security Exchange Name Local Phone Number Local Phone Number Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code AT&T Inc. 3.150% Global Notes due September 4, 2036 ATT Inc 3.150% Global Notes Due September 4, 2036 [Member] ATT Inc 3.150% Global Notes Due September 4, 2036 AT&T Inc. 2.450% Global Notes due March 15, 2035 ATT Inc 2.450% Global Notes Due March 15, 2035 [Member] ATT Inc 2.450% Global Notes Due March 15, 2035 Entity Address, State or Province Entity Address, State or Province AT&T Inc. 5.350% Global Notes due November 1, 2066 ATT Inc 5.350% Global Notes Due November 1, 2066 [Member] ATT Inc 5.350% Global Notes Due November 1, 2066 Cover [Abstract] AT&T Inc. 5.625% Global Notes due August 1, 2067 ATT Inc 5.625% Global Notes Due August 1, 2067 [Member] ATT Inc 5.625% Global Notes Due August 1, 2067 AT&T Inc. 4.875% Global Notes due June 1, 2044 ATT Inc 4.875% Global Notes Due June 1, 2044 [Member] ATT Inc 4.875% Global Notes Due June 1, 2044 AT&T Inc. 1.800% Global Notes due September 5, 2026 ATT Inc 1.800% Global Notes Due September 5, 2026 [Member] ATT Inc 1.800% Global Notes Due September 5, 2026 Document Type Document Type Class of Stock [Axis] Class of Stock [Axis] Depositary Shares, each representing a 1/1000th interest in a share of 5.000% Perpetual Preferred Stock, Series A Series A Preferred Stock [Member] Entities [Table] Entities [Table] AT&T Inc. 2.050% Global Notes due May 19, 2032 ATT Inc 2.050% Global Notes Due May 19, 2032 [Member] ATT Inc 2.050% Global Notes Due May 19, 2032 Entity Address, Address Line One Entity Address, Address Line One AT&T Inc. 4.300% Global Notes due November 18, 2034 ATT Inc. 4.300% Global Notes due November 18, 2034 [Member] ATT Inc. 4.300% Global Notes due November 18, 2034 Entity Registrant Name Entity Registrant Name AT&T Inc. 4.250% Global Notes due March 1, 2050 ATT Inc 4.250% Global Notes Due March 1, 2050 [Member] ATT Inc 4.250% Global Notes Due March 1, 2050 Entity Information [Line Items] Entity Information [Line Items] AT&T Inc. 1.800% Global Notes due September 14, 2039 ATT Inc 1.800% Global Notes Due September 14, 2039 [Member] ATT Inc 1.800% Global Notes Due September 14, 2039 Document Period End Date Document Period End Date AT&T Inc. 2.600% Global Notes due May 19, 2038 ATT Inc 2.600% Global Notes Due May 19, 2038 [Member] ATT Inc 2.600% Global Notes Due May 19, 2038 Class of Stock [Domain] Class of Stock [Domain] AT&T Inc. 3.550% Global Notes due November 18, 2025 ATT Inc. 3.550% Global Notes due November 18, 2025 [Member] ATT Inc. 3.550% Global Notes due November 18, 2025 Entity Central Index Key Entity Central Index Key Entity Address, City or Town Entity Address, City or Town Title of 12(b) Security Title of 12(b) Security Written Communications Written Communications Trading Symbol Trading Symbol Depositary Shares, each representing a 1/1000th interest in a share of 4.750% Perpetual Preferred Stock, Series C Series C Preferred Stock [Member] AT&T Inc. 3.375% Global Notes due March 15, 2034 ATT Inc 3.375% Global Notes Due March 15, 2034 [Member] ATT Inc 3.375% Global Notes Due March 15, 2034 Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer AT&T Inc. 4.375% Global Notes due September 14, 2029 ATT Inc 4.375% Global Notes Due September 14, 2029 [Member] ATT Inc 4.375% Global Notes Due September 14, 2029 Entity Emerging Growth Company Entity Emerging Growth Company AT&T Inc. 2.900% Global Notes due December 4, 2026 ATT Inc 2.900% Global Notes Due December 4, 2026 [Member] ATT Inc 2.900% Global Notes Due December 4, 2026 AT&T Inc. 3.950% Global Notes due April 30, 2031 ATT Inc. 3.950% Global Notes due April 30, 2031 [Member] ATT Inc. 3.950% Global Notes due April 30, 2031 AT&T Inc. 2.350% Global Notes due September 5, 2029 ATT Inc 2.350% Global Notes Due September 5, 2029 [Member] ATT Inc 2.350% Global Notes Due September 5, 2029 AT&T Inc. 3.500% Global Notes due December 17, 2025 ATT Inc 3.500% Global Notes Due December 17, 2025 [Member] ATT Inc 3.500% Global Notes Due December 17, 2025 Amendment Flag Amendment Flag AT&T Inc. 7.000% Global Notes due April 30, 2040 ATT Inc 7.000% Global Notes Due April 30, 2040 [Member] ATT Inc 7.000% Global Notes Due April 30, 2040 Entity File Number Entity File Number Entity Tax Identification Number Entity Tax Identification Number