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Long-Term Debt and Credit Facilities - Long Term Debt (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 USD ($) subsidiary | Dec. 31, 2023 USD ($)
Debt Disclosure [Abstract] |  |
Number of subsidiaries | subsidiary | 3 |
Long-term Debt and Credit Facilities |  |
Finance lease and other obligations | $ 263,000,000 | $ 285,000,000
Unamortized discounts, net | (412,000,000) | (4,000,000)
Unamortized debt issuance costs | (228,000,000) | (145,000,000)
Total long-term debt | 18,557,000,000 | 19,988,000,000
Less current maturities | (415,000,000) | (157,000,000)
Long-term debt, excluding current maturities | $ 18,142,000,000 | 19,831,000,000
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, gross | $ 12,000,000 | 2,411,000,000
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 |  |
Basis spread (as a percent) | 2.50% |
Long-term debt, gross | $ 0 | $ 215,000,000
Long-term debt, weighted average interest rate |  | 7.97%
Term Loan | Term Loan A |  |
Long-term Debt and Credit Facilities |  |
Basis spread (as a percent) | 6.00% |
Long-term debt, gross | $ 362,000,000 | $ 0
Long-term debt, weighted average interest rate | 11.247% | 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 | $ 1,610,000,000 | $ 0
Long-term debt, weighted average interest rate | 7.742% |
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 | $ 1,199,000,000 | 0
Long-term debt, weighted average interest rate | 11.838% |
Term Loan | Term Loan B-2 |  |
Long-term Debt and Credit Facilities |  |
Basis spread (as a percent) | 2.35% |
Long-term debt, gross | $ 1,610,000,000 | 0
Long-term debt, weighted average interest rate | 7.742% |
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 | $ 1,199,000,000 | 0
Long-term debt, weighted average interest rate | 11.838% |
Term Loan | Term Loan B |  |
Long-term Debt and Credit Facilities |  |
Basis spread (as a percent) | 2.25% |
Long-term debt, gross | $ 57,000,000 | $ 3,891,000,000
Long-term debt, weighted average interest rate | 7.611% | 7.72%
Term Loan | Tranche B 2027 Term Loan | Level 3 Financing, Inc. |  |
Long-term Debt and Credit Facilities |  |
Long-term debt, weighted average interest rate | 7.111% | 7.22%
Term Loan | Term Loan A-1 |  |
Long-term Debt and Credit Facilities |  |
Long-term debt, weighted average interest rate |  | 7.47%
Line of Credit and Term Loan | Other Facilities |  |
Long-term Debt and Credit Facilities |  |
Basis spread (as a percent) | 2.00% |
Long-term debt, gross | $ 0 | $ 1,399,000,000
Senior Notes | Superpriority Notes Due on Various Dates |  |
Long-term Debt and Credit Facilities |  |
Long-term debt, gross | $ 1,247,000,000 | 0
Senior Notes | Superpriority Notes Due on Various Dates | Minimum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 4.125% |
Senior Notes | Superpriority Notes Due on Various Dates | Maximum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 10.00% |
Senior Notes | 4.000% Senior Secured Notes Due 2027 |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 4.00% |
Long-term debt, gross | $ 0 | 1,250,000,000
Senior Notes | First Lien Notes | Level 3 Financing, Inc. |  |
Long-term Debt and Credit Facilities |  |
Long-term debt, gross | $ 3,846,000,000 | 925,000,000
Senior Notes | First Lien Notes | Level 3 Financing, Inc. | Minimum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 10.50% |
Senior Notes | First Lien Notes | Level 3 Financing, Inc. | Maximum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 11.00% |
Senior Notes | Second Lien Notes | Level 3 Financing, Inc. |  |
Long-term Debt and Credit Facilities |  |
Long-term debt, gross | $ 2,579,000,000 | 0
Senior Notes | Second Lien Notes | Level 3 Financing, Inc. | Minimum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 3.875% |
Senior Notes | Second Lien Notes | Level 3 Financing, Inc. | Maximum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 10.00% |
Senior Notes | Former Level 3 Senior Notes | Level 3 Financing, Inc. |  |
Long-term Debt and Credit Facilities |  |
Long-term debt, gross | $ 0 | 1,500,000,000
Senior Notes | Former Level 3 Senior Notes | Level 3 Financing, Inc. | Minimum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 3.40% |
Senior Notes | Former Level 3 Senior Notes | Level 3 Financing, Inc. | Maximum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 3.875% |
Senior Notes | Senior Notes Maturing 2025-2042 |  |
Long-term Debt and Credit Facilities |  |
Long-term debt, gross | $ 1,539,000,000 | 2,143,000,000
Senior Notes | Senior Notes Maturing 2025-2042 | Minimum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 4.00% |
Senior Notes | Senior Notes Maturing 2025-2042 | Maximum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 7.65% |
Senior Notes | Senior Notes Maturing 2027-2029 | Level 3 Financing, Inc. |  |
Long-term Debt and Credit Facilities |  |
Long-term debt, gross | $ 1,508,000,000 | 3,940,000,000
Senior Notes | Senior Notes Maturing 2027-2029 | Level 3 Financing, Inc. | Minimum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 3.40% |
Senior Notes | Senior Notes Maturing 2027-2029 | Level 3 Financing, Inc. | Maximum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 4.625% |
Senior Notes | Senior Notes Maturing 2025-2057 | Qwest Corporation |  |
Long-term Debt and Credit Facilities |  |
Long-term debt, gross | $ 1,974,000,000 | 1,986,000,000
Senior Notes | Senior Notes Maturing 2025-2057 | Qwest Corporation | Minimum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 6.50% |
Senior Notes | Senior Notes Maturing 2025-2057 | Qwest Corporation | Maximum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 7.75% |
Senior Notes | Senior Notes Maturing 2028-2031 | Qwest Capital Funding, Inc. |  |
Long-term Debt and Credit Facilities |  |
Long-term debt, gross | $ 192,000,000 | $ 192,000,000
Senior Notes | Senior Notes Maturing 2028-2031 | Qwest Capital Funding, Inc. | Minimum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 6.875% |
Senior Notes | Senior Notes Maturing 2028-2031 | Qwest Capital Funding, Inc. | Maximum |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 7.75% |
Senior Notes | 10.500% Senior Secured Notes due 2030 | Level 3 Financing, Inc. |  |
Long-term Debt and Credit Facilities |  |
Stated interest rate | 10.50% |

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