Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: 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(a)(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ExtinguishmentOfDebtAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lumn_A6750SeniorNotesSeriesWDue2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lumn_A7500SeniorNotesSeriesYDue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lumn_A5625SeniorNotesSeriesXDue2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lumn_A7200SeniorNotesSeriesDDue2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lumn_A5125SeniorSecuredNotesDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lumn_A6875DebenturesSeriesGDue2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lumn_A5375SeniorSecuredNotesDue2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=lumn_QwestCapitalFundingIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ExtinguishmentOfDebtAxis=us-gaap_FirstMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=lumn_EmbarqMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events - Debt Repayments (Details) - USD ($) $ in Millions		9 Months Ended
	Oct. 03, 2022	Sep. 30, 2022
Subsequent Event [Line Items]
Repayments of debt		$ 3,705
Subsequent Event
Subsequent Event [Line Items]
Repayments of debt	$ 3,224
Subsequent Event \| Senior Notes \| 6.750% Senior Notes, Series W, due 2023
Subsequent Event [Line Items]
Stated interest rate	6.75%
Repayments of debt	$ 750
Subsequent Event \| Senior Notes \| 7.500% Senior Notes, Series Y, due 2024
Subsequent Event [Line Items]
Stated interest rate	7.50%
Repayments of debt	$ 982
Subsequent Event \| Senior Notes \| 5.625% Senior Notes, Series X, due 2025
Subsequent Event [Line Items]
Stated interest rate	5.625%
Repayments of debt	$ 270
Subsequent Event \| Senior Notes \| 7.200% Senior Notes, Series D, due 2025
Subsequent Event [Line Items]
Stated interest rate	7.20%
Repayments of debt	$ 34
Subsequent Event \| Senior Notes \| 5.125% Senior Notes due 2026
Subsequent Event [Line Items]
Stated interest rate	5.125%
Repayments of debt	$ 484
Subsequent Event \| Senior Notes \| 6.875% Debentures, Series G, due 2028
Subsequent Event [Line Items]
Stated interest rate	6.875%
Repayments of debt	$ 126
Subsequent Event \| Senior Notes \| 5.375% Senior Notes due 2029
Subsequent Event [Line Items]
Stated interest rate	5.375%
Repayments of debt	$ 490
Subsequent Event \| Senior Notes \| Qwest Capital Funding, Inc.
Subsequent Event [Line Items]
Repayments of debt	63
Subsequent Event \| First Mortgage Bonds \| Embarq
Subsequent Event [Line Items]
Repayments of debt	$ 25