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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, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total notes and debentures $ 162,526 $ 122,381
Capitalized leases 1,818 869
Other 0 259
Total long-term debt, including current maturities 164,344 123,509
Current maturities of long-term debt (38,372) (9,828)
Total long-term debt 125,972 113,681
Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Carrying amount of notes and debentures [1] 166,031 124,901
Unamortized (discount) premium - net (2,968) (2,201)
Unamortized issuance costs $ (537) $ (319)
Notes And Debentures Maturing 2017-2022 [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] $ 20,534 $ 26,396
Notes And Debentures Maturing 2017-2022 [Member] | Notes And Debentures [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 0.49% 0.49%
Notes And Debentures Maturing 2017-2022 [Member] | Notes And Debentures [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 2.99% 2.99%
Notes And Debentures Maturing 2017-2049 [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] $ 93,915 $ 66,520
Notes And Debentures Maturing 2017-2049 [Member] | Notes And Debentures [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 3.00% 3.00%
Notes And Debentures Maturing 2017-2049 [Member] | Notes And Debentures [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 4.99% 4.99%
Notes And Debentures Maturing 2017-2095 [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] $ 46,343 $ 26,883
Notes And Debentures Maturing 2017-2095 [Member] | Notes And Debentures [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 5.00% 5.00%
Notes And Debentures Maturing 2017-2095 [Member] | Notes And Debentures [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 6.99% 6.99%
Notes And Debentures Maturing 2017-2097 [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] $ 4,579 $ 5,050
Notes And Debentures Maturing 2017-2097 [Member] | Notes And Debentures [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 7.00% 7.00%
Notes And Debentures Maturing 2017-2097 [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] $ 680 $ 4
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] $ (20) $ 48
[1]
Includes credit agreement borrowings.
[2]
Maturities assume putable debt is redeemed by the holders at the next opportunity.