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Debt (Bridge Loan Agreement) (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 29, 2017
Oct. 22, 2016
Dec. 31, 2017
Sep. 30, 2017
Tranche A Commitment [Member]        
Debt Instrument [Line Items]        
Face amount or capacity of debt (in millions) $ 750      
Credit agreement - initiation date Sep. 29, 2017      
Debt Instrument, Maturity Date Range, End     Jan. 31, 2018  
Credit agreement - advances outstanding     $ 0  
Ratio of net debt to EBITDA covenant     3.5 to 1  
Credit agreement - base rate     • at a variable annual rate equal to (1) the highest of: (a) the base rate of Scotiabank, (b) 0.50% per annum above the federal funds rate, and (c) the ICE Benchmark Administration Limited Settlement Rate applicable to U.S. dollars for a period of one month plus 1.00% per annum, plus (2) an applicable margin (as set forth in the Nova Scotia Credit Agreement); or • at a rate equal to: (i) LIBOR for a period of three or six months, as applicable, plus (ii) an applicable margin (as set forth in the Nova Scotia Credit Agreement).  
Tranche A Commitment [Member] | Base Rate [Member]        
Debt Instrument [Line Items]        
Credit agreement - commitment fee percentage     0.07%  
Tranche A Commitment [Member] | Base Rate [Member] | Additional Margin Upon Default [Member]        
Debt Instrument [Line Items]        
Credit agreement - basis spread of variable rate     2.00%  
Tranche B Commitment [Member]        
Debt Instrument [Line Items]        
Face amount or capacity of debt (in millions) $ 750      
Credit agreement - initiation date Sep. 29, 2017      
Debt Instrument, Maturity Date Range, End     Jan. 31, 2018  
Credit agreement - advances outstanding     $ 0  
Ratio of net debt to EBITDA covenant     3.5 to 1  
Credit agreement - base rate     • at a variable annual rate equal to (1) the highest of: (a) the base rate of Scotiabank, (b) 0.50% per annum above the federal funds rate, and (c) the ICE Benchmark Administration Limited Settlement Rate applicable to U.S. dollars for a period of one month plus 1.00% per annum, plus (2) an applicable margin (as set forth in the Nova Scotia Credit Agreement); or • at a rate equal to: (i) LIBOR for a period of three or six months, as applicable, plus (ii) an applicable margin (as set forth in the Nova Scotia Credit Agreement).  
Tranche B Commitment [Member] | Base Rate [Member]        
Debt Instrument [Line Items]        
Credit agreement - commitment fee percentage     0.07%  
Tranche B Commitment [Member] | Base Rate [Member] | Additional Margin Upon Default [Member]        
Debt Instrument [Line Items]        
Credit agreement - basis spread of variable rate     2.00%  
Time Warner Inc. [Member] | Bridge Loan [Member]        
Debt Instrument [Line Items]        
Face amount or capacity of debt (in millions)   $ 40,000    
Credit agreement - initiation date   Oct. 22, 2016    
Credit agreement - advances outstanding       $ 0
Ratio of net debt to EBITDA covenant     3.5 to 1  
Credit agreement - base rate     On October 22, 2016, in connection with entering into the Time Warner merger agreement, AT&T entered into a $40,000 bridge loan with JPMorgan Chase Bank and Bank of America as lenders (the “Bridge Loan”) , which was subsequently reduced to $30,000. In September 2017, following the completion of our acquisition-related debt issuances, we reduced the commitments under the Bridge Loan to $0 and terminated the facility.  
Time Warner Inc. [Member] | Bridge Loan [Member] | Additional Margin Upon Default [Member]        
Debt Instrument [Line Items]        
Credit agreement - basis spread of variable rate     2.00%