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 Entity Tax Identification Number Entity Tax Identification Number Entity File Number Entity File Number Title of 12(b) Security Title of 12(b) Security 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 Entities [Table] Entities [Table] Class of Stock [Domain] Class of Stock [Domain] Entity Incorporation, State or Country Code Entity Incorporation, State or Country 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. 4.050% Global Notes due June 1, 2037 ATT Inc 4.050% Global Notes Due June 1, 2037 [Member] ATT Inc 4.050% Global Notes Due June 1, 2037 Entity Information [Line Items] Entity Information [Line Items] 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 Depositary Shares, each representing a 1/1000th interest in a share of 5.000% Perpetual Preferred Stock, Series A Series A Preferred Stock [Member] 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 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 Document Period End Date Document Period End Date Amendment Flag Amendment Flag Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer AT&T Inc. Floating Rate Global Notes due September 16, 2027 ATT Inc Floating Rate Global Notes Due September 16, 2027 [Member] ATT Inc Floating Rate Global Notes Due September 16, 2027 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 Security Exchange Name Security Exchange Name Document Type Document Type 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 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 Pre-commencement Tender Offer Pre-commencement Tender Offer Entity Central Index Key Entity Central Index Key AT&T Inc. 3.600% Global Notes due June 1, 2033 ATT Inc 3.600% Global Notes Due June 1, 2033 [Member] ATT Inc 3.600% Global Notes Due June 1, 2033 Common Shares (Par Value $1.00 Per Share) Common Stock [Member] 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 Cover [Abstract] 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 Local Phone Number Local Phone Number Soliciting Material Soliciting Material Entity Address, Address Line One Entity Address, Address Line One 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 Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Entity Address, State or Province Entity Address, State or Province Depositary Shares, each representing a 1/1000th interest in a share of 4.750% Perpetual Preferred Stock, Series C Series C Preferred Stock [Member] Written Communications Written Communications Trading Symbol Trading Symbol City Area Code City Area Code 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 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 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 Entity Address, City or Town Entity Address, City or Town 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. 3.150% Global Notes due June 1, 2030 ATT Inc. 3.150% Global Notes Due June 1, 2030 [Member] ATT Inc. 3.150% Global Notes Due June 1, 2030 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 Class of Stock [Axis] Class of Stock [Axis] Entity Emerging Growth Company Entity Emerging Growth Company