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Debt (Summary Of Long-Term Debt Of AT&T And Its Subsidiaries) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Unamortized (discount) premium - net $ (2,526) $ (2,968)
Unamortized issuance costs (466) (537)
Total notes and debentures 171,529 162,526
Capitalized leases 1,911 1,818
Total long-term debt and capital lease obligations 173,440 164,344
Current maturities of long-term debt (7,190) (38,372)
Total long-term debt 166,250 125,972
Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Total notes and debentures 174,521 166,031
Notes And Debentures Maturing 2018-2022 [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Total notes and debentures [1] $ 14,404 $ 19,514
Notes And Debentures Maturing 2018-2022 [Member] | Notes And Debentures [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 0.49% 0.49%
Notes And Debentures Maturing 2018-2022 [Member] | Notes And Debentures [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 2.99% 2.99%
Notes And Debentures Maturing 2018-2049 [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Total notes and debentures [1] $ 104,291 $ 93,915
Notes And Debentures Maturing 2018-2049 [Member] | Notes And Debentures [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 3.00% 3.00%
Notes And Debentures Maturing 2018-2049 [Member] | Notes And Debentures [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 4.99% 4.99%
Notes And Debentures Maturing 2018-2095 [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Total notes and debentures [1] $ 37,175 $ 46,343
Notes And Debentures Maturing 2018-2095 [Member] | Notes And Debentures [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 5.00% 5.00%
Notes And Debentures Maturing 2018-2095 [Member] | Notes And Debentures [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 6.99% 6.99%
Notes And Debentures Maturing 2018-2097 [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Total notes and debentures [1] $ 5,976 $ 4,579
Notes And Debentures Maturing 2018-2097 [Member] | Notes And Debentures [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 7.00% 7.00%
Notes And Debentures Maturing 2018-2097 [Member] | Notes And Debentures [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instument - stated percentage rate 9.50% 9.50%
Credit agreement borrowings [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Total notes and debentures $ 12,618 $ 1,700
Other Debt [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Total notes and debentures 89 0
Fair value of interest rate swaps recorded in debt [Member] | Notes And Debentures [Member]    
Debt Instrument [Line Items]    
Total notes and debentures $ (32) $ (20)
[1]
Maturities assume putable debt is redeemed by the holders at the next opportunity.