Long-Term Debt and Credit Facilities - Covenants and Guarantees (Details)	Dec. 31, 2023 USD ($) indenture
Letter of Credit | Uncommitted Revolving Letter of Credit Facility
Long-term Debt and Credit Facilities
Maximum borrowing capacity	$ 225,000,000
Senior Notes
Long-term Debt and Credit Facilities
Number of indentures | indenture	4
Credit Facility | Letter of Credit | Uncommitted Revolving Letter of Credit Facility
Long-term Debt and Credit Facilities
Maximum borrowing capacity	$ 225,000,000
Maximum
Long-term Debt and Credit Facilities
Leverage ratio	4.75
Maximum | Qwest Corporation
Long-term Debt and Credit Facilities
EBITDA ratio	2.85
Minimum
Long-term Debt and Credit Facilities
Coverage ratio	2.00