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Long-Term Debt and Credit Facilities - Impact of Recent Debt Transactions, Additional Information (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 24, 2024 USD ($) series | Sep. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2024 USD ($)
Long-term Debt and Credit Facilities |  |  |  |  |  |  |
Face amount |  | $ 11,938 |  |  | $ 11,938 |  |
Repayments of debt |  |  |  |  | 2,258 |  |
Reduction of debt | $ 60 |  |  |  |  |  |
Debt fees |  | 14 |  |  | 14 |  |
Amount of debt extinguished |  |  |  |  | 744 |  |
Net gain on early retirement of debt |  | (1) | $ 275 | $ 0 | 277 | $ 618 |
Reduction in debt from fair value adjustment |  |  |  |  | 492 |  |
Payment for lender fees |  |  |  |  | 209 |  |
Payment for third-party costs |  |  |  |  | 174 |  |
Debt instrument, capitalized lender fees |  | 52 |  |  | 52 |  |
Third party costs capitalized |  | 62 |  |  | 62 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |  |  |  |
Debt instrument, lender fees |  |  |  |  | 157 |  |
Selling, General and Administrative Expense |  |  |  |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |  |  |  |
Debt instrument, third-party costs |  |  |  |  | 112 |  |
Level 3 Financing, Inc. |  |  |  |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |  |  |  |
Amount of debt extinguished |  |  |  |  | 2,600 |  |
Senior Notes |  |  |  |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |  |  |  |
Face amount |  | 848 |  |  | 848 |  |
Net gain on early retirement of debt |  |  |  |  | 3 |  |
Senior Notes | 10.000% Secured Notes Due 2032 |  |  |  |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |  |  |  |
Face amount | $ 438 |  |  |  |  |  |
Stated interest rate | 10.00% |  |  |  |  |  |
Senior Notes | Senior Unsecured Notes Due 2026-2032 |  |  |  |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |  |  |  |
Face amount | $ 491 |  |  |  |  |  |
Repayments of debt | $ 14 |  |  |  |  |  |
Number of series | series | 4 |  |  |  |  |  |
Senior Notes | 10.000% Second Lien Notes Due 2032 | Level 3 Financing, Inc. |  |  |  |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |  |  |  |
Face amount | $ 350 |  |  |  |  |  |
Stated interest rate | 10.00% |  |  |  |  |  |
Senior Notes | Senior Unsecured Notes Due 2027 | Level 3 Financing, Inc. |  |  |  |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |  |  |  |
Face amount | $ 357 |  |  |  |  |  |
Number of series | series | 2 |  |  |  |  |  |
Senior Notes | Lumen and Qwest, Senior Unsecured Notes Due 2025 |  |  |  |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |  |  |  |
Repurchased face amount |  | 19 |  |  | 19 |  |
Senior Notes | Senior Unsecured Notes Due 2025 |  |  |  |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |  |  |  |
Repurchased face amount |  |  |  |  |  |  | $ 75
Superpriority Notes and Term Loans |  |  |  |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |  |  |  |
Repurchased face amount |  | $ 19 |  |  | $ 19 |  |

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