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Long-Term Debt and Note Payable - Affiliate - Additional Information (Details) - USD ($)
9 Months Ended 36 Months Ended
Oct. 23, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Oct. 26, 2020
Sep. 16, 2020
Aug. 07, 2020
Jun. 29, 2020
Jan. 15, 2020
Dec. 31, 2019
Sep. 30, 2017
Long-term debt                      
Net loss on early retirement of debt   $ 36,000,000 $ 0                
Note payable - affiliate   1,130,000,000   $ 1,130,000,000           $ 1,069,000,000  
Repayments of term loan   1,860,000,000 $ 10,000,000                
Senior notes                      
Long-term debt                      
Net loss on early retirement of debt   36,000,000                  
Note payable - affiliate | Affiliated entity                      
Long-term debt                      
Note payable - affiliate   $ 1,130,000,000   $ 1,130,000,000           $ 1,069,000,000  
Weighted average interest rate   4.974%   4.974%              
Note payable - affiliate | Affiliated entity | Qwest Corporation                      
Long-term debt                      
Note payable - affiliate funding commitment                     $ 965,000,000
Note payable - affiliate   $ 1,130,000,000   $ 1,130,000,000              
Weighted average interest rate   4.974%   4.974%              
Interest costs capitalized       $ 165,000,000              
Accrued interest   $ 14,000,000   $ 14,000,000              
Term loan | Subsequent Event                      
Long-term debt                      
Proceeds from term loan $ 215,000,000                    
Repayments of term loan $ 100,000,000                    
6.625% Notes Due 2055 | Senior notes                      
Long-term debt                      
Repurchased face amount           $ 250,000,000          
Stated interest rate           6.625%          
6.625% Notes Due 2055 | Senior notes | Subsequent Event                      
Long-term debt                      
Repurchased face amount         $ 160,000,000            
Stated interest rate         6.625%            
Debt instrument, face amount         $ 0            
6.875% Notes Due 2054 | Senior notes                      
Long-term debt                      
Repurchased face amount             $ 300,000,000 $ 200,000,000      
Stated interest rate             6.875% 6.875%      
6.875% Notes Due 2033 | Senior notes                      
Long-term debt                      
Repurchased face amount                 $ 850,000,000    
Stated interest rate                 6.875%    
7.125% Notes Due 2043 | Senior notes                      
Long-term debt                      
Repurchased face amount                 $ 250,000,000    
Stated interest rate                 7.125%