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v3.19.3

Segment Information - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2019 segment category regional_operating_unit customer
Segment Reporting Information [Line Items] |
Number of reportable segments | segment | 5
Number of global enterprise customers | customer | 200
Number of operating regions | regional_operating_unit | 3
International and Global Accounts |
Segment Reporting Information [Line Items] |
Number of categories of products and services | 4
Consumer |
Segment Reporting Information [Line Items] |
Number of categories of products and services | 4

X
- Definition Represents the number of categories in which the entity categorizes the products and services. + References No definition available. + Details
Name: | ctl_NumberOfCategoriesOfProductsAndServices
Namespace Prefix: | ctl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Global Enterprise Customers + References No definition available. + Details
Name: | ctl_NumberofGlobalEnterpriseCustomers
Namespace Prefix: | ctl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Operating Regions + References No definition available. + Details
Name: | ctl_NumberofOperatingRegions
Namespace Prefix: | ctl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ctl_InternationalandGlobalAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ctl_ConsumerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |