Document Entity Information - USD ($) $ / shares in Units, $ in Billions |
12 Months Ended |
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Dec. 31, 2019 |
Feb. 12, 2020 |
Jun. 30, 2019 |
| Cover [Abstract] |
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| Document Type |
10-K
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| Amendment Flag |
false
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| Document Annual Report |
true
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| Document Period End Date |
Dec. 31, 2019
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| Document Fiscal Year Focus |
2019
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| Document Fiscal Period Focus |
FY
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| Document Transition Report |
false
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| Current Fiscal Year End Date |
--12-31
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| Entity Central Index Key |
0000732717
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| Entity File Number |
001-8610
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| Entity Registrant Name |
AT&T INC.
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| Entity Incorporation, State or Country Code |
DE
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| Entity Tax Identification Number |
43-1301883
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| Entity Address, Address Line One |
208 S. Akard St.
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| Entity Address, City or Town |
Dallas
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| Entity Address, State or Province |
TX
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| Entity Address, Postal Zip Code |
75202
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| City Area Code |
210
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| Local Phone Number |
821-4105
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| Entity Current Reporting Status |
Yes
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| Entity Voluntary Filers |
No
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| Entity Interactive Data Current |
Yes
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| Entity Filer Category |
Large Accelerated Filer
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| Entity Small Business |
false
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| Entity Emerging Growth Company |
false
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| Entity Well-known Seasoned Issuer |
Yes
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| Entity Shell Company |
false
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| Share Price |
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$ 33.51
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| Entity Public Float |
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$ 245
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| Entity Common Stock, Shares Outstanding |
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7,172,884,070
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| Common Shares (Par Value $1.00 Per Share) |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
Common Shares (Par Value $1.00 Per Share)
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| Entity Trading Symbol |
T
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| Security Exchange Name |
NYSE
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| Depositary Shares, each representing a 1/1000th interest in a share of 5.000% Perpetual Preferred Stock, Series A |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
Depositary Shares, each representing a 1/1000th interest in a share of 5.000% Perpetual Preferred Stock, Series A
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| Entity Trading Symbol |
TPRA
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| Security Exchange Name |
NYSE
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| Depositary Shares, each representing a 1/1000th interest in a share of 4.750% Perpetual Preferred Stock, Series C |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
Depositary Shares, each representing a 1/1000th interest in a share of 4.750% Perpetual Preferred Stock, Series C
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| Entity Trading Symbol |
TPRC
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| Security Exchange Name |
NYSE
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| AT&T Inc. Floating Rate Due August 3 2020 Member [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. Floating Rate Global Notes due August 3, 2020
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| Entity Trading Symbol |
T 20C
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| Security Exchange Name |
NYSE
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| AT&T Inc. 1.875% Global Notes due December 4, 2020 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 1.875% Global Notes due December 4, 2020
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| Entity Trading Symbol |
T 20
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| Security Exchange Name |
NYSE
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| AT&T Inc. 2.650% Global Notes due December 17, 2021 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 2.650% Global Notes due December 17, 2021
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| Entity Trading Symbol |
T 21B
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| Security Exchange Name |
NYSE
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| AT&T Inc. 1.450% Global Notes due June 1, 2022 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 1.450% Global Notes due June 1, 2022
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| Entity Trading Symbol |
T 22B
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| Security Exchange Name |
NYSE
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| AT&T Inc. 2.500% Global Notes due March 15, 2023 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 2.500% Global Notes due March 15, 2023
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| Entity Trading Symbol |
T 23
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| Security Exchange Name |
NYSE
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| AT&T Inc. 2.750% Global Notes due May 19, 2023 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 2.750% Global Notes due May 19, 2023
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| Entity Trading Symbol |
T 23C
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| Security Exchange Name |
NYSE
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| AT&T Inc. Floating Rate Due September 5, 2023 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. Floating Rate Global Notes due September 5, 2023
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| Entity Trading Symbol |
T 23D
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| Security Exchange Name |
NYSE
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| AT&T Inc. 1.050% Global Notes due September 5, 2023 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 1.050% Global Notes due September 5, 2023
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| Entity Trading Symbol |
T 23E
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| Security Exchange Name |
NYSE
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| AT&T Inc. 1.300% Global Notes due September 5, 2023 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 1.300% Global Notes due September 5, 2023
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| Entity Trading Symbol |
T 23A
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| Security Exchange Name |
NYSE
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| AT&T Inc. 1.950% Global Notes due September 15, 2023 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 1.950% Global Notes due September 15, 2023
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| Entity Trading Symbol |
T 23F
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| Security Exchange Name |
NYSE
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| AT&T Inc. 2.400% Global Notes due March 15, 2024 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 2.400% Global Notes due March 15, 2024
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| Entity Trading Symbol |
T 24A
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| Security Exchange Name |
NYSE
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| AT&T Inc. 3.500% Global Notes due December 17, 2025 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 3.500% Global Notes due December 17, 2025
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| Entity Trading Symbol |
T 25
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| Security Exchange Name |
NYSE
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| AT&T Inc. 0.250% Global Notes due March 4, 2026 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 0.250% Global Notes due March 4, 2026
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| Entity Trading Symbol |
T 26E
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| Security Exchange Name |
NYSE
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| AT&T Inc. 1.800% Global Notes due September 5, 2026 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 1.800% Global Notes due September 5, 2026
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| Entity Trading Symbol |
T 26D
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| Security Exchange Name |
NYSE
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| AT&T Inc. 2.900% Global Notes due December 4, 2026 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 2.900% Global Notes due December 4, 2026
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| Entity Trading Symbol |
T 26A
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| Security Exchange Name |
NYSE
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| AT&T Inc. 4.375% Global Notes due September 14, 2029 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 4.375% Global Notes due September 14, 2029
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| Entity Trading Symbol |
T 29B
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| Security Exchange Name |
NYSE
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| AT&T Inc. 2.600% Global Notes due December 17, 2029 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 2.600% Global Notes due December 17, 2029
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| Entity Trading Symbol |
T 29A
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| Security Exchange Name |
NYSE
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| AT&T Inc. 0.800% Global Notes due March 4, 2030 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 0.800% Global Notes due March 4, 2030
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| Entity Trading Symbol |
T 30B
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| Security Exchange Name |
NYSE
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| AT&T Inc. 3.550% Global Notes due December 17, 2032 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 3.550% Global Notes due December 17, 2032
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| Entity Trading Symbol |
T 32
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| Security Exchange Name |
NYSE
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| AT&T Inc. 5.200% Global Notes due November 18, 2033 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 5.200% Global Notes due November 18, 2033
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| Entity Trading Symbol |
T 33
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| Security Exchange Name |
NYSE
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| AT&T Inc. 3.375% Global Notes due March 15, 2034 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 3.375% Global Notes due March 15, 2034
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| Entity Trading Symbol |
T 34
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| Security Exchange Name |
NYSE
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| AT&T Inc. 2.450% Global Notes Due March 15, 2035 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 2.450% Global Notes due March 15, 2035
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| Entity Trading Symbol |
T 35
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| Security Exchange Name |
NYSE
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| AT&T Inc. 3.150% Global Notes due September 4, 2036 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 3.150% Global Notes due September 4, 2036
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| Entity Trading Symbol |
T 36A
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| Security Exchange Name |
NYSE
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| AT&T Inc. 1.800% Global Notes due September 14, 2039 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 1.800% Global Notes due September 14, 2039
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| Entity Trading Symbol |
T 39B
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| Security Exchange Name |
NYSE
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| AT&T Inc. 7.000% Global Notes Due April 30, 2040 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 7.000% Global Notes due April 30, 2040
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| Entity Trading Symbol |
T 40
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| Security Exchange Name |
NYSE
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| AT&T Inc. 4.250% Global Notes due June 1, 2043 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 4.250% Global Notes due June 1, 2043
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| Entity Trading Symbol |
T 43
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| Security Exchange Name |
NYSE
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| AT&T Inc. 4.875% Global Notes due June 1, 2044 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 4.875% Global Notes due June 1, 2044
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| Entity Trading Symbol |
T 44
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| Security Exchange Name |
NYSE
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| AT&T Inc. 4.250% Global Notes due March 1, 2050 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 4.250% Global Notes due March 1, 2050
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| Entity Trading Symbol |
T 50
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| Security Exchange Name |
NYSE
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| AT&T Inc. 5.350% Global Notes due November 1, 2066 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 5.350% Global Notes due November 1, 2066
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| Entity Trading Symbol |
TBB
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| Security Exchange Name |
NYSE
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| AT&T Inc. 2.350% Global Notes due September 5, 2029 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 2.350% Global Notes due September 5, 2029
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| Entity Trading Symbol |
T 29D
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| Security Exchange Name |
NYSE
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| AT&T Inc. 5.625% Global Notes due August 1, 2067 [Member] |
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| Entity Listings [Line Items] |
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| Title of 12(b) Security |
AT&T Inc. 5.625% Global Notes due August 1, 2067
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| Entity Trading Symbol |
TBC
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| Security Exchange Name |
NYSE
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