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Long-Term Debt and Credit Facilities - Long Term Debt (Details) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) subsidiary | Mar. 31, 2024 | Dec. 31, 2023 USD ($)
Debt Disclosure [Abstract] |  |  |
Number of subsidiaries | subsidiary | 3 |  |
Long-term Debt and Credit Facilities |  |  |
Finance lease and other obligations | $ 270,000,000 |  | $ 285,000,000
Unamortized discounts, net | (476,000,000) |  | (4,000,000)
Unamortized debt issuance costs | (235,000,000) |  | (145,000,000)
Total long-term debt | 18,603,000,000 |  | 19,988,000,000
Less current maturities | (192,000,000) |  | (157,000,000)
Long-term debt, excluding current maturities | $ 18,411,000,000 |  | 19,831,000,000
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%
Series A Revolving Credit Facility | Line of Credit |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 4.00% |  |
Long-term debt, gross | $ 0 |  | $ 0
Series B Revolving Credit Facility | Line of Credit |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 6.00% |  |
Long-term debt, gross | $ 0 |  | 0
Term Loan A | Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 6.00% |  |
Long-term debt, gross | $ 368,000,000 |  | $ 0
Long-term debt, weighted average interest rate | 11.344% |  | 7.464%
Term Loan B-1 | Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 2.35% |  |
Long-term debt, gross | $ 1,621,000,000 |  | $ 0
Long-term debt, weighted average interest rate | 7.808% |  |
Term Loan B-1 | Term Loan | 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 | 11.904% |  |
Term Loan B-2 | Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 2.35% |  |
Long-term debt, gross | $ 1,621,000,000 |  | 0
Long-term debt, weighted average interest rate | 7.808% |  |
Term Loan B-2 | Term Loan | 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 | 11.904% |  |
Term Loan B | Term Loan |  |  |
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 | 7.708% |  | 7.72%
Other Facilities | Line of Credit and Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 2.00% |  |
Long-term debt, gross | $ 0 |  | $ 1,399,000,000
4.125% Senior Secured Notes Due 2029-2030 | Senior Notes |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 4.125% |  |
Long-term debt, gross | $ 812,000,000 |  | 0
4.000% Senior Secured Notes Due 2027 | Senior Notes |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 4.00% | 4.00% |
Long-term debt, gross | $ 0 |  | 1,250,000,000
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
Tranche B 2027 Term Loan | Term Loan | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Long-term debt, weighted average interest rate | 7.208% |  | 7.22%
First Lien Notes | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Long-term debt, gross | $ 3,846,000,000 |  | $ 925,000,000
First Lien Notes | Senior Notes | Level 3 Financing, Inc. | Minimum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 10.50% |  |
First Lien Notes | Senior Notes | Level 3 Financing, Inc. | Maximum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 11.00% |  |
Second Lien Notes | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Long-term debt, gross | $ 2,229,000,000 |  | 0
Second Lien Notes | Senior Notes | Level 3 Financing, Inc. | Minimum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 3.875% |  |
Second Lien Notes | Senior Notes | Level 3 Financing, Inc. | Maximum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 4.875% |  |
Former Level 3 Senior Notes | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Long-term debt, gross | $ 0 |  | 1,500,000,000
Former Level 3 Senior Notes | Senior Notes | Level 3 Financing, Inc. | Minimum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 3.40% |  |
Former Level 3 Senior Notes | Senior Notes | Level 3 Financing, Inc. | Maximum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 3.875% |  |
Senior Notes Maturing 2025-2042 | Senior Notes |  |  |
Long-term Debt and Credit Facilities |  |  |
Long-term debt, gross | $ 2,037,000,000 |  | 2,143,000,000
Senior Notes Maturing 2025-2042 | Senior Notes | Minimum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 4.00% |  |
Senior Notes Maturing 2025-2042 | Senior Notes | Maximum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 7.65% |  |
Senior Notes Maturing 2027-2029 | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Long-term debt, gross | $ 1,865,000,000 |  | 3,940,000,000
Senior Notes Maturing 2027-2029 | Senior Notes | Level 3 Financing, Inc. | Minimum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 3.40% |  |
Senior Notes Maturing 2027-2029 | Senior Notes | Level 3 Financing, Inc. | Maximum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 4.625% |  |
Senior Notes Maturing 2025-2057 | Senior Notes | Qwest Corporation |  |  |
Long-term Debt and Credit Facilities |  |  |
Long-term debt, gross | $ 1,986,000,000 |  | 1,986,000,000
Senior Notes Maturing 2025-2057 | Senior Notes | Qwest Corporation | Minimum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 6.50% |  |
Senior Notes Maturing 2025-2057 | Senior Notes | Qwest Corporation | Maximum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 7.75% |  |
Senior Notes Maturing 2028-2031 | Senior Notes | Qwest Capital Funding, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Long-term debt, gross | $ 192,000,000 |  | $ 192,000,000
Senior Notes Maturing 2028-2031 | Senior Notes | Qwest Capital Funding, Inc. | Minimum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 6.875% |  |
Senior Notes Maturing 2028-2031 | Senior Notes | Qwest Capital Funding, Inc. | Maximum |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 7.75% |  |
Term Loan A-1 | Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Long-term debt, weighted average interest rate |  |  | 7.47%
10.500% Senior Secured Notes due 2030 | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate | 10.50% |  |

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