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Long-Term Debt and Note Payable - Affiliate - Additional Information (Details) - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Feb. 16, 2021
Dec. 31, 2020
Sep. 30, 2017
Long-term debt          
Net loss on early retirement of debt $ 8,000,000 $ 19,000,000      
Note payable - affiliate 1,158,000,000     $ 1,130,000,000  
Senior notes          
Long-term debt          
Net loss on early retirement of debt 8,000,000        
Note payable - affiliate | Affiliated entity          
Long-term debt          
Note payable - affiliate 1,158,000,000     $ 1,130,000,000  
Note payable - affiliate | Affiliated entity | Qwest Corporation          
Long-term debt          
Note payable - affiliate funding commitment         $ 965,000,000
Note payable - affiliate 1,200,000,000        
Accrued interest on note payable - affiliate $ 28,000,000        
7.000% Notes Due 2056 | Senior notes          
Long-term debt          
Repurchased face amount     $ 235,000,000    
Stated interest rate     7.00%