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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