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v3.25.0.1

Employee Benefits - Health Care and Life Insurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Retirement Benefits [Abstract] |  |  |
Health care benefit expenses | $ 99 | $ 101 | $ 99

X
- Definition Represents the health care benefit expenses for the active employees health care plan. + References No definition available. + Details
Name: | lumn_HealthCareBenefitExpensesActiveEmployees
Namespace Prefix: | lumn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration