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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% |  |

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