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Debt (Summary Of Long-Term Debt Of AT&T And Its Subsidiaries) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Unamortized issuance costs $ (319) $ (323)
Total notes and debentures 122,381 124,847
Capitalized leases 869 884
Other 259 416
Total long-term debt, including current maturities 123,509 126,147
Current maturities of long-term debt (9,828) (7,632)
Total long-term debt $ 113,681 118,515
Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 1.00%  
Maximum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 9.10%  
Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Carrying amount of notes and debentures [1] $ 124,901 126,012
Unamortized (discount) premium - net $ (2,201) $ (842)
Notes And Debentures Maturing 2016-2022 [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Debt instrument, maturity date range, start [2] Dec. 31, 2017 Dec. 31, 2016
Debt instrument, maturity date range, end [2] Dec. 31, 2022 Dec. 31, 2022
Carrying amount of notes and debentures [1] $ 26,396 $ 34,265
Notes And Debentures Maturing 2016-2022 [Member] | Notes And Debentures [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 0.49% 0.49%
Notes And Debentures Maturing 2016-2022 [Member] | Notes And Debentures [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 2.99% 2.99%
Notes And Debentures Maturing 2016-2049 [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Debt instrument, maturity date range, start [2] Dec. 31, 2017 Dec. 31, 2016
Debt instrument, maturity date range, end [2] Dec. 31, 2049 Dec. 31, 2049
Carrying amount of notes and debentures [1] $ 66,520 $ 54,678
Notes And Debentures Maturing 2016-2049 [Member] | Notes And Debentures [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 3.00% 3.00%
Notes And Debentures Maturing 2016-2049 [Member] | Notes And Debentures [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 4.99% 4.99%
Notes And Debentures Maturing 2016-2095 [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Debt instrument, maturity date range, start [2] Dec. 31, 2017 Dec. 31, 2016
Debt instrument, maturity date range, end [2] Dec. 31, 2095 Dec. 31, 2095
Carrying amount of notes and debentures [1] $ 26,883 $ 31,140
Notes And Debentures Maturing 2016-2095 [Member] | Notes And Debentures [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 5.00% 5.00%
Notes And Debentures Maturing 2016-2095 [Member] | Notes And Debentures [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 6.99% 6.99%
Notes And Debentures Maturing 2016-2097 [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Debt instrument, maturity date range, start [2] Dec. 31, 2017 Dec. 31, 2016
Debt instrument, maturity date range, end [2] Dec. 31, 2097 Dec. 31, 2097
Carrying amount of notes and debentures [1] $ 5,050 $ 5,805
Notes And Debentures Maturing 2016-2097 [Member] | Notes And Debentures [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 7.00% 7.00%
Notes And Debentures Maturing 2016-2097 [Member] | Notes And Debentures [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 9.50% 9.50%
Other Debt [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Carrying amount of notes and debentures [1] $ 4 $ 15
Fair value of interest rate swaps recorded in debt [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Carrying amount of notes and debentures [1] $ 48 $ 109
[1]
Includes credit agreement borrowings.
[2]
Maturities assume putable debt is redeemed by the holders at the next opportunity.