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v3.20.2

Products and Services Revenue - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2020 category
Revenue from Contract with Customer [Abstract] |
Number of categories of products and services | 6

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