Represents the number of categories in which the entity categorizes the products and services.

No definition available.

Name:	lumn_NumberOfCategoriesOfProductsAndServices
Namespace Prefix:	lumn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue from Contract with Customer, Contract Term

+ References

No definition available.

+ Details

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Namespace Prefix:	lumn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue from Contract with Customer, Length of Customer Life

+ References

No definition available.

+ Details

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Namespace Prefix:	lumn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=lumn_ConsumerCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=lumn_BusinessCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lumn_BusinessSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Revenue Recognition - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) category	Mar. 31, 2020 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue recognized \| $	$ 425	$ 495
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract term	1 year
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract term	5 years
Weighted Average \| Consumer Customers
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Length of customer life	30 months
Weighted Average \| Business Customers
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Length of customer life	30 months
Business
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of categories of products and services	4
Mass Markets
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of categories of products and services	4