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Long-Term Debt and Credit Facilities - Long Term Debt (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) subsidiary | Mar. 31, 2024 | Dec. 31, 2023 USD ($) | Apr. 17, 2023
Debt Disclosure [Abstract] |  |  |  |
Number of subsidiaries | subsidiary | 3 |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Finance lease and other obligations | $ 254 |  | $ 285 |
Unamortized discounts, net | (395) |  | (4) |
Unamortized debt issuance costs | (217) |  | (145) |
Total long-term debt | 17,906 |  | 19,988 |
Less current maturities | (412) |  | (157) |
Long-term debt, excluding current maturities | 17,494 |  | 19,831 |
Tranche B 2027 Term Loan | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross | $ 12 |  | 2,411 |
Line of Credit | Series A Revolving Credit Facility |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 4.00% |  |  |
Long-term debt, gross | $ 0 |  | 0 |
Line of Credit | Series B Revolving Credit Facility |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 6.00% |  |  |
Long-term debt, gross | $ 0 |  | $ 0 |
Term Loan | Qwest Corporation |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, weighted average interest rate (as a percent) |  |  | 7.97% |
Term Loan | Term Loan A |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 6.00% |  |  |
Long-term debt, gross | $ 357 |  | $ 0 |
Long-term debt, weighted average interest rate (as a percent) | 10.573% |  | 7.464% |
Term Loan | Term Loan B-1 |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 2.35% |  |  |
Long-term debt, gross | $ 1,606 |  | $ 0 |
Long-term debt, weighted average interest rate (as a percent) | 7.037% |  |  |
Term Loan | Term Loan B-1 | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 6.56% |  |  |
Long-term debt, gross | $ 1,199 |  | 0 |
Long-term debt, weighted average interest rate (as a percent) | 11.133% |  |  |
Term Loan | Term Loan B-2 |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 2.35% |  |  |
Long-term debt, gross | $ 1,606 |  | 0 |
Long-term debt, weighted average interest rate (as a percent) | 7.037% |  |  |
Term Loan | Term Loan B-2 | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 6.56% |  |  |
Long-term debt, gross | $ 1,199 |  | 0 |
Long-term debt, weighted average interest rate (as a percent) | 11.133% |  |  |
Term Loan | Term Loan B |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 2.25% |  |  |
Long-term debt, gross | $ 56 |  | $ 3,891 |
Long-term debt, weighted average interest rate (as a percent) | 6.937% |  | 7.72% |
Term Loan | Tranche B 2027 Term Loan | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 1.75% |  |  |
Long-term debt, weighted average interest rate (as a percent) | 6.437% |  | 7.22% |
Term Loan | Former Term Loan | Qwest Corporation |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross | $ 0 |  | $ 215 |
Term Loan | Term Loan A-1 |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, weighted average interest rate (as a percent) |  |  | 7.47% |
Line of Credit and Medium-term Notes | Other Facilities |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross | 0 |  | $ 1,399 |
Senior Notes | Superpriority Notes |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross | $ 1,247 |  | 0 |
Senior Notes | Superpriority Notes | Minimum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 4.125% |  |  |
Senior Notes | Superpriority Notes | Maximum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 10.00% |  |  |
Senior Notes | Former Parent Secured Notes |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross | $ 0 |  | $ 1,250 |
Long-term debt, weighted average interest rate (as a percent) |  |  | 4.00% |
Senior Notes | First Lien Notes | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross | $ 3,846 |  | $ 925 |
Senior Notes | First Lien Notes | Level 3 Financing, Inc. | Minimum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 10.50% |  |  |
Senior Notes | First Lien Notes | Level 3 Financing, Inc. | Maximum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 11.00% |  |  |
Senior Notes | Second Lien Notes | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross | $ 2,579 |  | 0 |
Senior Notes | Second Lien Notes | Level 3 Financing, Inc. | Minimum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 3.875% |  |  |
Senior Notes | Second Lien Notes | Level 3 Financing, Inc. | Maximum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 10.00% |  |  |
Senior Notes | Former Level 3 Senior Notes | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross | $ 0 |  | $ 1,500 |
Senior Notes | Former Level 3 Senior Notes | Level 3 Financing, Inc. | Minimum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, weighted average interest rate (as a percent) |  |  | 3.40% |
Senior Notes | Former Level 3 Senior Notes | Level 3 Financing, Inc. | Maximum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, weighted average interest rate (as a percent) |  |  | 3.875% |
Senior Notes | Senior Notes Due 2025-2042 |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross | $ 1,428 |  | $ 2,143 |
Senior Notes | Senior Notes Due 2025-2042 | Minimum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 4.00% |  |  |
Senior Notes | Senior Notes Due 2025-2042 | Maximum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 7.65% |  |  |
Senior Notes | Senior Notes Maturing 2027-2029 | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross | $ 964 |  | 3,940 |
Senior Notes | Senior Notes Maturing 2027-2029 | Level 3 Financing, Inc. | Minimum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 3.40% |  |  |
Senior Notes | Senior Notes Maturing 2027-2029 | Level 3 Financing, Inc. | Maximum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 4.625% |  |  |
Senior Notes | Senior Notes, Maturing 2025-2057 | Qwest Corporation |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross | $ 1,973 |  | 1,986 |
Senior Notes | Senior Notes, Maturing 2025-2057 | Qwest Corporation | Minimum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 6.50% |  |  |
Senior Notes | Senior Notes, Maturing 2025-2057 | Qwest Corporation | Maximum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 7.75% |  |  |
Senior Notes | Senior Notes Maturing 2028 - 2031 | Qwest Capital Funding, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross | $ 192 |  | $ 192 |
Senior Notes | Senior Notes Maturing 2028 - 2031 | Qwest Capital Funding, Inc. | Minimum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 6.875% |  |  |
Senior Notes | Senior Notes Maturing 2028 - 2031 | Qwest Capital Funding, Inc. | Maximum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 7.75% |  |  |
Senior Notes | 10.500% Senior Secured Notes due 2030 | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate (as a percent) | 10.50% | 10.50% |  | 10.50%

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