XML 67 R70.htm IDEA: XBRL DOCUMENT
v3.19.3

Segment Information - USF Surcharges and Transaction Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting [Abstract] |  |  |  |
USF surcharges and transaction taxes | $ 270 | $ 221 | $ 750 | $ 698

X
- Definition Amount of the universal taxes and surcharges that are reflected in the statement of income (included in both operating revenues and expenses). + References No definition available. + Details
Name: | ctl_UniversalServiceTaxesAndSurcharges
Namespace Prefix: | ctl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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