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Long-Term Debt and Credit Facilities - Additional Information (Details) |  | 3 Months Ended |
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Mar. 22, 2024 USD ($) Agreement | Mar. 31, 2024 USD ($) indenture | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($)
Long-term Debt and Credit Facilities |  |  |  |
Number of debt agreements | Agreement | 2 |  |  |
Face amount |  | $ 11,982,000,000 |  |
Reduction in total debt maturities |  | $ 10,200,000,000 |  |
Long-term debt, weighted average interest rate |  | 7.73% |  | 6.23%
Reduction in debt resulting from debt extinguishment |  | $ 492,000,000 |  |
Net gain on extinguishment of debt |  | 275,000,000 | $ 609,000,000 |
Payment for lender fees |  | 209,000,000 |  |
Payment for third-party costs |  | 174,000,000 |  |
Debt instrument, capitalized lender fees |  | 52,000,000 |  |
Third party costs capitalized |  | $ 62,000,000 |  |
Last Day of Each Fiscal Quarter |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Maximum total net leverage ratio |  | 5.75 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Debt instrument, lender fees |  | $ 157,000,000 |  |
Operating Expense |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Debt instrument, third-party costs |  | 112,000,000 |  |
Revolving Credit Facility |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Maximum borrowing capacity |  | 1,000,000,000 |  | $ 2,200,000,000
Borrowings |  | 0 |  |
Remaining borrowing capacity |  | 715,000,000 |  |
Letter of Credit |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Borrowings |  | $ 241,000,000 |  |
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% |  |
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% |  |
Level 3 Financing, Inc. | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Floor rate (as a percent) |  | 2.00% |  |
Basis spread (as a percent) |  | 6.56% |  |
Level 3 Financing, Inc. | Base Rate |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 5.56% |  |
Series A Revolving Credit Facility |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Maximum borrowing capacity |  | $ 489,000,000 |  |
Series A Revolving Credit Facility | Financial Guarantee |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Guaranteed amount |  | 150,000,000 |  |
Series B Revolving Credit Facility |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Maximum borrowing capacity |  | 467,000,000 |  |
Series B Revolving Credit Facility | Financial Guarantee |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Guaranteed amount |  | 150,000,000 |  |
Uncommitted Revolving Letter of Credit Facility | Letter of Credit |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Maximum borrowing capacity |  | 225,000,000 |  |
Tranche B 2027 Term Loan | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross |  | $ 12,000,000 |  | 2,411,000,000
Tranche B 2027 Term Loan | Level 3 Financing, Inc. | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 1.75% |  |
Senior Notes |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Number of indentures | indenture |  | 4 |  |
Redemption price (as a percent) |  | 101.00% |  |
Senior Notes | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Redemption price (as a percent) |  | 101.00% |  |
Senior Notes | First Lien Notes | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Face amount | $ 1,575,000,000 |  |  |
Proceeds from debt issuance | 1,325,000,000 | $ 1,325,000,000 |  |
Non-cash fee | 50,000,000 |  |  |
Long-term debt, gross |  | $ 3,846,000,000 |  | 925,000,000
Senior Notes | First Lien Notes | Level 3 Financing, Inc. | Maximum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate |  | 11.00% |  |
Senior Notes | First Lien Notes | Level 3 Financing, Inc. | Minimum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Stated interest rate |  | 10.50% |  |
Senior Notes | 4.000% Senior Secured Notes Due 2027 |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Face amount | $ 200,000,000 |  |  |
Stated interest rate | 4.00% | 4.00% |  |
Long-term debt, gross |  | $ 0 |  | 1,250,000,000
Line of Credit | Revolving Credit Facility |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross |  | $ 0 |  |
Line of Credit | Series A Revolving Credit Facility |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, weighted average interest rate |  | 8.05% |  |
Floor rate (as a percent) |  | 2.00% |  |
Long-term debt, gross |  | $ 0 |  | 0
Line of Credit | Series A Revolving Credit Facility | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 4.00% |  |
Line of Credit | Series A Revolving Credit Facility | Base Rate |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 3.00% |  |
Line of Credit | Series B Revolving Credit Facility |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, weighted average interest rate |  | 10.05% |  |
Floor rate (as a percent) |  | 2.00% |  |
Long-term debt, gross |  | $ 0 |  | $ 0
Line of Credit | Series B Revolving Credit Facility | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 6.00% |  |
Line of Credit | Series B Revolving Credit Facility | Base Rate |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 5.00% |  |
Term Loan | Term Loan A |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Face amount |  | $ 372,000,000 |  |
Long-term debt, weighted average interest rate |  | 11.329% |  | 7.47%
Long-term debt, gross |  | $ 372,000,000 |  | $ 0
Term Loan | Term Loan A | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 6.00% |  |
Term Loan | Term Loan B |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, weighted average interest rate |  | 7.695% |  | 7.72%
Debt instrument periodic payment (as a percent) |  | 0.25% |  |
Long-term debt, gross |  | $ 57,000,000 |  | $ 3,891,000,000
Term Loan | Term Loan B | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 2.25% |  |
Term Loan | Term Loan B-1 |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Face amount |  | $ 1,625,000,000 |  |
Long-term debt, weighted average interest rate |  | 7.739% |  |
Long-term debt, gross |  | $ 1,625,000,000 |  | 0
Term Loan | Term Loan B-1 | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 2.35% |  |
Term Loan | Term Loan B-1 | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Face amount |  | $ 1,199,000,000 |  |
Long-term debt, weighted average interest rate |  | 11.889% |  |
Long-term debt, gross |  | $ 1,199,000,000 |  | 0
Term Loan | Term Loan B-1 | Level 3 Financing, Inc. | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 6.56% |  |
Term Loan | Term Loan B-2 |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Face amount |  | $ 1,625,000,000 |  |
Long-term debt, weighted average interest rate |  | 7.739% |  |
Long-term debt, gross |  | $ 1,625,000,000 |  | 0
Term Loan | Term Loan B-2 | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 2.35% |  |
Term Loan | Term Loan B-2 | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Face amount |  | $ 1,199,000,000 |  |
Long-term debt, weighted average interest rate |  | 11.889% |  |
Long-term debt, gross |  | $ 1,199,000,000 |  | $ 0
Term Loan | Term Loan B-2 | Level 3 Financing, Inc. | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 6.56% |  |
Term Loan | Tranche B 2027 Term Loan | Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, weighted average interest rate |  | 7.195% |  | 7.22%
Long-term debt, gross |  | $ 12,000,000 |  |
Term Loan | Superpriority Secured Term Loan Facility |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Face amount |  | $ 377,000,000 |  |
Floor rate (as a percent) |  | 2.00% |  |
Debt instrument periodic payment (as a percent) |  | 1.25% |  |
Term Loan | Superpriority Secured Term Loan Facility | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 6.00% |  |
Term Loan | Superpriority Secured Term Loan Facility | Base Rate |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 5.00% |  |
Term Loan | Superpriority Term Loan B |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Floor rate (as a percent) |  | 0.00% |  |
Term Loan | Superpriority Term Loan B | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 2.35% |  |
Term Loan | Superpriority Term Loan B | Base Rate |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 1.35% |  |
Line of Credit and Term Loan | Fiscal Quarter Ending After December 31, 2024 |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Maximum total net leverage ratio |  | 5.50 |  |
Line of Credit and Term Loan | Fiscal Quarter Ending After December 31, 2025 |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Maximum total net leverage ratio |  | 5.25 |  |
Line of Credit and Term Loan | Minimum |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Interest coverage ratio |  | 2.00 |  |
Line of Credit and Term Loan | Other Facilities |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross |  | $ 0 |  | $ 1,399,000,000
Line of Credit and Term Loan | Other Facilities | SOFR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 2.00% |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-4 + Details
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