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Long-Term Debt and Credit Facilities - Lumen Credit Agreements and Level 3 Credit Agreement (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 22, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount |  | $ 11,925 |
Series A Revolving Credit Facility |  |  |
Long-term Debt and Credit Facilities |  |  |
Maximum borrowing capacity | $ 489 | $ 489 |
Series A Revolving Credit Facility | Line of Credit |  |  |
Long-term Debt and Credit Facilities |  |  |
Floor interest rate (as a percent) | 2.00% |  |
Basis spread (as a percent) |  | 4.00% |
Long-term debt, gross |  | $ 0 | $ 0
Series A Revolving Credit Facility | Line of Credit | SOFR |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 4.00% |  |
Series A Revolving Credit Facility | Line of Credit | Base Rate |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 3.00% |  |
Series B Revolving Credit Facility |  |  |
Long-term Debt and Credit Facilities |  |  |
Maximum borrowing capacity | $ 467 | $ 465 |
Series B Revolving Credit Facility | Line of Credit |  |  |
Long-term Debt and Credit Facilities |  |  |
Floor interest rate (as a percent) | 2.00% |  |
Basis spread (as a percent) |  | 6.00% |
Long-term debt, gross |  | $ 0 | $ 0
Series B Revolving Credit Facility | Line of Credit | SOFR |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 6.00% |  |
Series B Revolving Credit Facility | Line of Credit | Base Rate |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 5.00% |  |
Lumen TLA | Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount | $ 377 |  |
Floor interest rate (as a percent) | 2.00% |  |
Debt instrument periodic payment (as a percent) | 1.25% |  |
Lumen TLA | Term Loan | SOFR |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 6.00% |  |
Lumen TLA | Term Loan | Base Rate |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 5.00% |  |
TLB Credit Agreement | Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Floor interest rate (as a percent) | 0.00% |  |
Debt instrument periodic payment (as a percent) | 0.25% |  |
TLB Credit Agreement | Term Loan | SOFR |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 2.35% |  |
TLB Credit Agreement | Term Loan | Base Rate |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 1.35% |  |
Lumen TLB-1 | Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount | $ 1,600 |  |
Lumen TLB-2 | Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount | $ 1,600 |  |
New Level 3 Credit Agreement | Level 3 Financing, Inc. | Prepaid on or Prior to the 12-Month Anniversary of the Effective Date |  |  |
Long-term Debt and Credit Facilities |  |  |
Prepayment premium, rate | 2.00% |  |
New Level 3 Credit Agreement | Level 3 Financing, Inc. | Prepaid After the 12-Month Anniversary and on or Prior to the 24-Month Anniversary of the Effective Date |  |  |
Long-term Debt and Credit Facilities |  |  |
Prepayment premium, rate | 1.00% |  |
New Level 3 Credit Agreement | Term Loan | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Floor interest rate (as a percent) | 2.00% |  |
New Level 3 Credit Agreement | Term Loan | SOFR | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 6.56% |  |
New Level 3 Credit Agreement | Term Loan | Base Rate | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Basis spread (as a percent) | 5.56% |  |
Secured Term B-1 Loan | Term Loan | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount | $ 1,200 |  |
Secured Term B-2 Loan | Term Loan | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount | $ 1,200 |  |

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