v3.20.1
Document and Entity Information
Jun. 24, 2020
Document And Entity Information [Line Items]  
Amendment Flag false
Entity Central Index Key 0000732717
Document Type 8-K
Document Period End Date Jun. 24, 2020
Entity Registrant Name AT&T INC.
Entity Incorporation State Country Code DE
Entity File Number 001-08610
Entity Tax Identification Number 43-1301883
Entity Address, Address Line One 208 S. Akard St.
Entity Address, City or Town Dallas
Entity Address, State or Province TX
Entity Address, Postal Zip Code 75202
City Area Code (210)
Local Phone Number 821-4105
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Shares (Par Value $1.00 Per Share)
Trading Symbol T
Security Exchange Name NYSE
Series A Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, each representing a 1/1000th interest in a share of 5.000% Perpetual Preferred Stock, Series A
Trading Symbol T PRA
Security Exchange Name NYSE
Series C Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, each representing a 1/1000th interest in a share of 4.750% Perpetual Preferred Stock, Series C
Trading Symbol T PRC
Security Exchange Name NYSE
Att Inc . Floating Rate Global Notes Due August 320202 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. Floating Rate Global Notes due August 3, 2020
Trading Symbol T 20C
Security Exchange Name NYSE
Att Inc .1.875 Global Notes Due December 420207 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 1.875% Global Notes due December 4, 2020
Trading Symbol T 20
Security Exchange Name NYSE
Att Inc .2.650 Global Notes Due December 1720213 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 2.650% Global Notes due December 17, 2021
Trading Symbol T 21B
Security Exchange Name NYSE
Att Inc .1.450 Global Notes Due June 1202210 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 1.450% Global Notes due June 1, 2022
Trading Symbol T 22B
Security Exchange Name NYSE
Att Inc .2.500 Global Notes Due March 1520235 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 2.500% Global Notes due March 15, 2023
Trading Symbol T 23
Security Exchange Name NYSE
Att Inc .2.750 Global Notes Due May 1920239 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 2.750% Global Notes due May 19, 2023
Trading Symbol T 23C
Security Exchange Name NYSE
Att Inc . Floating Rate Global Notes Due September 520231 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. Floating Rate Global Notes due September 5, 2023
Trading Symbol T 23D
Security Exchange Name NYSE
Att Inc .1.050 Global Notes Due September 52023 Member 14 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 1.050% Global Notes due September 5, 2023
Trading Symbol T 23E
Security Exchange Name NYSE
Att Inc .1.300 Global Notes Due September 5202313 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 1.300% Global Notes due September 5, 2023
Trading Symbol T 23A
Security Exchange Name NYSE
Att Inc .1.950 Global Notes Due September 152023 Member 16 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 1.950% Global Notes due September 15, 2023
Trading Symbol T 23F
Security Exchange Name NYSE
Att Inc .2.400 Global Notes Due March 1520241 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 2.400% Global Notes due March 15, 2024
Trading Symbol T 24A
Security Exchange Name NYSE
Att Inc .3.500 Global Notes Due December 1720254 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 3.500% Global Notes due December 17, 2025
Trading Symbol T 25
Security Exchange Name NYSE
Att Inc .0.250 Global Notes Due March 42026 Member 20 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 0.250% Global Notes due March 4, 2026
Trading Symbol T 26E
Security Exchange Name NYSE
Att Inc .1.800 Global Notes Due September 520262 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 1.800% Global Notes due September 5, 2026
Trading Symbol T 26D
Security Exchange Name NYSE
Att Inc .2.900 Global Notes Due December 420265 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 2.900% Global Notes due December 4, 2026
Trading Symbol T 26A
Security Exchange Name NYSE
Att Inc .1.600 Global Notes Due May 1920286 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 1.600% Global Notes due May 19, 2028
Trading Symbol T 28C
Security Exchange Name NYSE
Att Inc .2.350 Global Notes Due September 5202912 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 2.350% Global Notes due September 5, 2029
Trading Symbol T 29D
Security Exchange Name NYSE
Att Inc .4.375 Global Notes Due September 14202913 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 4.375% Global Notes due September 14, 2029
Trading Symbol T 29B
Security Exchange Name NYSE
Att Inc .2.600 Global Notes Due December 172029 Member 16 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 2.600% Global Notes due December 17, 2029
Trading Symbol T 29A
Security Exchange Name NYSE
Att Inc .0.800 Global Notes Due March 4203017 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 0.800% Global Notes due March 4, 2030
Trading Symbol T 30B
Security Exchange Name NYSE
Att Inc .2.050 Global Notes Due May 1920327 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 2.050% Global Notes due May 19, 2032
Trading Symbol T 32A
Security Exchange Name NYSE
Att Inc .3.550 Global Notes Due December 1720326 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 3.550% Global Notes due December 17, 2032
Trading Symbol T 32
Security Exchange Name NYSE
Att Inc .5.200 Global Notes Due November 182033 Member 18 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 5.200% Global Notes due November 18, 2033
Trading Symbol T 33
Security Exchange Name NYSE
Att Inc .3.375 Global Notes Due March 1520342 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 3.375% Global Notes due March 15, 2034
Trading Symbol T 34
Security Exchange Name NYSE
Att Inc .2.450 Global Notes Due March 1520353 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 2.450% Global Notes due March 15, 2035
Trading Symbol T 35
Security Exchange Name NYSE
Att Inc .3.150 Global Notes Due September 4203614 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 3.150% Global Notes due September 4, 2036
Trading Symbol T 36A
Security Exchange Name NYSE
Att Inc .2.600 Global Notes Due May 1920388 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 2.600% Global Notes due May 19, 2038
Trading Symbol T 38C
Security Exchange Name NYSE
Att Inc .1.800 Global Notes Due September 1420391 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 1.800% Global Notes due September 14, 2039
Trading Symbol T 39B
Security Exchange Name NYSE
ATT Inc 7000 Global Notes Due April 302040 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 7.000% Global Notes due April 30, 2040
Trading Symbol T 40
Security Exchange Name NYSE
Att Inc .4.250 Global Notes Due June 1204318 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 4.250% Global Notes due June 1, 2043
Trading Symbol T 43
Security Exchange Name NYSE
Att Inc .4.875 Global Notes Due June 120448 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 4.875% Global Notes due June 1, 2044
Trading Symbol T 44
Security Exchange Name NYSE
Att Inc .4.000 Global Notes Due June 120499 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 4.000% Global Notes due June 1, 2049
Trading Symbol T 49A
Security Exchange Name NYSE
Att Inc .4.250 Global Notes Due March 1205019 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 4.250% Global Notes due March 1, 2050
Trading Symbol T 50
Security Exchange Name NYSE
Att Inc .5.350 Global Notes Due November 1206617 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 5.350% Global Notes due November 1, 2066
Trading Symbol TBB
Security Exchange Name NYSE
ATT Inc 5625 Global Notes Due August 12067 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title AT&T Inc. 5.625% Global Notes due August 1, 2067
Trading Symbol TBC
Security Exchange Name NYSE