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Long-Term Debt and Credit Facilities - Term Loans and Certain Other Debt of Subsidiaries (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 23, 2020 | Nov. 27, 2019 | Dec. 31, 2022 | Dec. 31, 2021
Qwest Corporation | Term Loan |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross |  |  | $ 215 | $ 215
Qwest Corporation | Term Loan | LIBOR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  |  | 2.25% |
Qwest Corporation | CoBank ACB | Variable Rate Term Loan |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Proceeds from issuance of debt | $ 215 |  |  |
Qwest Corporation | CoBank ACB | Variable Rate Term Loan | Minimum | LIBOR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 1.50% |  |  |
Qwest Corporation | CoBank ACB | Variable Rate Term Loan | Minimum | Base Rate |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 0.50% |  |  |
Qwest Corporation | CoBank ACB | Variable Rate Term Loan | Maximum | LIBOR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 2.50% |  |  |
Qwest Corporation | CoBank ACB | Variable Rate Term Loan | Maximum | Base Rate |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) | 1.50% |  |  |
Level 3 Financing, Inc. | Term Loan | Tranche B 2027 Term Loan |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Long-term debt, gross |  |  | $ 2,411 | $ 3,111
Level 3 Financing, Inc. | Term Loan | Tranche B 2027 Term Loan | LIBOR |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 1.00% | 1.75% |
Level 3 Financing, Inc. | Term Loan | Tranche B 2027 Term Loan | Base Rate |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 0.75% |  |
Level 3 Financing, Inc. | Term Loan | Tranche B 2027 Term Loan | Federal Funds Effective Rate |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 0.50% |  |
Level 3 Financing, Inc. | Term Loan | Tranche B 2027 Term Loan | Eurodollar |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Basis spread (as a percent) |  | 1.75% |  |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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