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Additional Financial Information (Narrative) (Details)
€ in Millions, R in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2020
USD ($)
Apr. 30, 2018
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
EUR (€)
Sep. 30, 2020
ZAR (R)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
EUR (€)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Apr. 30, 2020
USD ($)
Additional Financial Information [Line Items]                    
Vendor financing payables     $ 3,252         $ 3,252    
Vendor financing payables due within one year     1,474         1,474    
Long-term debt obligations     158,878         158,878    
Repayment of long-term debt               $ 37,583 $ 24,368  
Minimum                    
Additional Financial Information [Line Items]                    
Vendor financing payables, noncurrent, period due within               2 years    
Maximum                    
Additional Financial Information [Line Items]                    
Vendor financing payables, noncurrent, period due within               3 years    
Notes And Debentures                    
Additional Financial Information [Line Items]                    
Commercial paper     $ 1,710         $ 1,710    
Notes And Debentures | Long-Term Debt Issuance                    
Additional Financial Information [Line Items]                    
Weighted average interest rate     3.20%         3.20%    
Notes And Debentures | Long-Term Debt Redemptions                    
Additional Financial Information [Line Items]                    
Weighted average interest rate     3.20%         3.20%    
Term Loan Credit Agreement                    
Additional Financial Information [Line Items]                    
Repayment of long-term debt           $ 1,800        
Term Loan Credit Agreement | Bank of America, N.A.                    
Additional Financial Information [Line Items]                    
Short-term borrowings                   $ 5,500
Repayments on short-term borrowings $ 5,500                  
AT&T Global Notes Due 2027 To 2060                    
Additional Financial Information [Line Items]                    
Proceeds from issuance of debt           16,545        
AT&T Global Notes Due 2028 To 2038                    
Additional Financial Information [Line Items]                    
Proceeds from issuance of debt           3,281 € 3,000      
AT&T Global Notes Due 2028 To 2061                    
Additional Financial Information [Line Items]                    
Proceeds from issuance of debt     $ 11,000              
AT&T Global Notes Due 2020 To 2047                    
Additional Financial Information [Line Items]                    
Repayment of long-term debt           12,689        
Annual Put Reset Securities                    
Additional Financial Information [Line Items]                    
Repayment of long-term debt           $ 1,000        
AT&T, WarnerMedia and DIRECTV Notes Due 2022                    
Additional Financial Information [Line Items]                    
Repayment of long-term debt     4,264              
AT&T and WarnerMedia Global Notes Due 2022 to 2023                    
Additional Financial Information [Line Items]                    
Repayment of long-term debt     1,158              
AT&T Floating-Rate Notes Due 2020                    
Additional Financial Information [Line Items]                    
Repayment of long-term debt     2,637 € 2,250            
Sky Servicos de Banda Larga Ltda. Floating-Rate Private Loan Due 2021                    
Additional Financial Information [Line Items]                    
Proceeds from issuance of debt   $ 1,000                
Repayment of long-term debt     638   R 3,381          
AT&T Global Notes And Subsidiary Notes Due 2021 To 2025                    
Additional Financial Information [Line Items]                    
Repayment of long-term debt     11,384              
AT&T and Subsidiary Notes Due 2031 to 2058                    
Additional Financial Information [Line Items]                    
Repayment of long-term debt     1,459              
Amount of debt exchanged     17,677              
Three New Series of Global Notes Due 2053 to 2059                    
Additional Financial Information [Line Items]                    
Proceeds from issuance of debt     $ 21,500              
Vendor Financing Program                    
Additional Financial Information [Line Items]                    
Noncash investing activities               $ 3,148 $ 1,917